1. A mechanical processing method of a silicon target is characterized by comprising the following steps:

(1) carrying out primary grinding treatment on the silicon target material according to the shape of the target material to obtain a rough-machined silicon target material;

(2) and (3) carrying out secondary grinding treatment on the rough-processed silicon target material obtained in the step (1) to obtain a silicon target material with a smooth surface.

2. The method for machining a silicon target according to claim 1, wherein the tool used in the first grinding treatment in step (1) comprises a cubic boron nitride tool.

3. The method of machining a silicon target according to claim 2, wherein the cubic boron nitride cutter used in the step (1) has a boron nitride content of 40 to 90%;

preferably, the cubic boron nitride cutting tool used in step (1) has an average particle size of boron nitride of 20 to 30 μm.

4. The method for machining a silicon target as claimed in any one of claims 1 to 3, wherein the first grinding treatment in step (1) is performed at a rotational speed of cubic boron nitride tool of 200-400r/min, a feed rate of 0.05-0.3mm/r, and a feed rate of 0.01-0.3 mm.

5. The method of machining a silicon target according to any one of claims 1 to 4, wherein the margin left on the edge of the rough-machined silicon target is 0.05 to 0.10 mm.

6. The method for machining a silicon target according to any one of claims 1 to 5, wherein the tool used in the second grinding treatment in step (2) comprises a cubic boron nitride tool.

7. The method for machining the silicon target according to claim 6, wherein the cubic boron nitride cutter used in the step (2) contains 40 to 90% of boron nitride;

preferably, the cubic boron nitride cutting tool used in step (2) has an average particle size of boron nitride of 2 to 10 μm.

8. The method for machining a silicon target as claimed in any one of claims 1 to 7, wherein the rotation speed of the cubic boron nitride tool used in the second grinding treatment in step (2) is 100-300r/min, the feeding amount is 0.01-0.03mm/r, and the feeding amount is 0.01-0.03 mm.

9. The method for machining a silicon target according to any one of claims 1 to 8, wherein the first grinding treatment in the step (1) and the second grinding treatment in the step (2) are performed independently under spray cooling;

preferably, the spray comprises alcohol.

10. The method for machining a silicon target according to any one of claims 1 to 9, wherein the method for machining a silicon target comprises the steps of:

(1) according to the shape of the target material, a cubic boron nitride cutter is used for carrying out primary grinding treatment on the silicon target material, the rotating speed of the cubic boron nitride cutter used for the primary grinding treatment is 200-400r/min, the feed rate is 0.05-0.3mm/r, and the feed rate is 0.01-0.3mm, so as to obtain a rough-processed silicon target material;

(2) and (2) carrying out secondary grinding treatment on the rough-processed silicon target material obtained in the step (1) by using a cubic boron nitride cutter, wherein the rotating speed of the cubic boron nitride cutter used in the secondary grinding treatment is 100-300r/min, the feed rate is 0.01-0.03mm/r, and the feed rate is 0.01-0.03mm, so as to obtain the silicon target material with a smooth surface.

Background

Magnetron sputtering is a substrate coating process which bombards a target material by using charged particles to enable target material atoms to escape from the surface and be uniformly deposited on a substrate. Magnetron sputtering has become an optimal substrate coating process with the advantages of high sputtering rate, low substrate temperature rise, good film-substrate bonding force, excellent metal coating uniformity and strong controllability, and the like, and is widely applied to coating processes of electronic and information industries such as integrated circuits, information storage, liquid crystal display screens, laser memories, electronic controllers and the like.

With the rapid development of the electronic information industry, for example, in the manufacturing process of integrated circuits, the size of a substrate of a chip is continuously increased, the size of electronic equipment is continuously reduced, and the integration level of electronic devices of the integrated circuits is continuously increased, so that the requirements on the uniformity of a coating film of magnetron sputtering and the like are continuously increased. Correspondingly, for the key factors of the coating quality of magnetron sputtering, the quality of the target material used by magnetron sputtering is continuously improved. Such as the flatness and parallelism of the surface of the target material, have important effects on the uniformity and quality index of the coating. The flatness refers to the deviation of the height of the target surface asperities from an ideal plane, and the parallelism refers to the degree to which two planes or two straight lines of the target are parallel, specifically, the maximum allowable error value of the parallelism of one plane (or side) and the plane (or side) opposite to the plane (or side).

In the machining process of the target blank in the target preparation, the edge and the surface of the target blank need to be subjected to finish machining according to a preset size so as to improve the parallelism and the flatness of the target and enable the target to be matched with the size requirement of a magnetron sputtering device. However, in the process of cutting the target material by the cutter, after the target material is subjected to the action of external load, internal stress in the target material is gradually released from the interior of the target material, so that the product is deformed, and the flatness is deviated; after the cutter is contacted with the target blank, torsion is generated when the cutter is used for processing the surface of the workpiece, and the torsion can cause the workpiece to vibrate, so that the target deforms and influences the surface processing quality of the workpiece.

Silicon materials are widely used in the integrated circuit industry and have wide market prospects. The silicon target is one of the targets, and can also be used for manufacturing components of the target. However, the silicon material has the characteristics of high hardness and large brittleness, and in the mechanical processing process of the silicon target material, the internal stress of the target material is not completely released, the generated torsion action is large, the cutter abrasion is large, and in the processing process, the target material is often cracked, cracked and the like.

Therefore, it is an urgent need to solve the problem of the art to improve the machining quality of the silicon target, obtain a specific silicon target, and improve the machining yield of the silicon target.

Disclosure of Invention

The invention aims to provide a processing method of a silicon target, which can effectively shorten the working procedure, save materials and ensure the processing precision and quality of the silicon target, so that the size and the appearance of the processed silicon target meet the requirements of the target, and the cutter has small abrasion and long service life.

In order to achieve the purpose, the invention adopts the following technical scheme:

the invention provides a machining method of a silicon target, which comprises the following steps:

(1) carrying out primary grinding treatment on the silicon target material according to the shape of the target material to obtain a rough-machined silicon target material;

(2) and (3) carrying out secondary grinding treatment on the rough-processed silicon target material obtained in the step (1) to obtain a silicon target material with a smooth surface.

According to the invention, the silicon target material is subjected to the first grinding treatment and the second grinding treatment respectively, so that the silicon target material is free from corner collapse or cracking in the treatment process, and the requirements of the target material on size and appearance are met.

According to the requirements of practical application, the silicon target blank can be processed into any shape through primary grinding treatment, and the required appearance shape of the target is obtained.

Preferably, the tool used in the first grinding treatment in step (1) comprises a cubic boron nitride tool.

Preferably, the cubic boron nitride cutting tool used in step (1) has a boron nitride content of 40 to 90%, for example, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85% or 90%, but is not limited to the recited values, and other values not recited in the numerical ranges are also applicable.

Preferably, the cubic boron nitride cutting tool used in step (1) has a particle size of 20 to 30 μm, and may be, for example, 20 μm, 21 μm, 22 μm, 23 μm, 24 μm, 25 μm, 26 μm, 27 μm, 28 μm, 29 μm or 30 μm, but is not limited to the values recited, and other values not recited in the numerical ranges are also applicable.

Preferably, the rotating speed of the cubic boron nitride cutter used in the first grinding treatment in the step (1) is 200-400r/min, such as 200r/min, 220r/min, 240r/min, 260r/min, 280r/min, 300r/min, 320r/min, 340r/min, 360r/min, 380r/min or 400 r/min; a feed amount of 0.05 to 0.3mm/r, for example, 0.05mm/r, 0.08mm/r, 0.1mm/r, 0.12mm/r, 0.14mm/r, 0.16mm/r, 0.18mm/r, 0.2mm/r, 0.22mm/r, 0.24mm/r, 0.26mm/r, 0.28mm/r or 0.3mm/r, but not limited to the values listed, and other values not listed in the numerical range are also applicable; the amount of feed is 0.01 to 0.3mm, and may be, for example, 0.01mm, 0.05mm, 0.08mm, 0.1mm, 0.14mm, 0.18mm, 0.22mm, 0.26mm or 0.3mm, but is not limited to the values listed, and other values not listed in the numerical range are also applicable.

Preferably, the rough silicon target has a margin of 0.05-0.10mm, such as 0.05mm, 0.06mm, 0.07mm, 0.08mm, 0.09mm or 0.10mm, but not limited to the recited values, and other values within the range are equally applicable.

Preferably, the cubic boron nitride cutting tool used in step (2) has a boron nitride content of 40-90%, for example, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85% or 90%, but is not limited to the recited values, and other values not recited in the numerical ranges are also applicable.

Preferably, the cubic boron nitride cutting tool used in step (2) has a boron nitride particle size of 2 to 10 μm, and may be, for example, 2 μm, 3 μm, 4 μm, 5 μm, 6 μm, 7 μm, 8 μm, 9 μm or 10 μm, but is not limited to the values recited, and other values not recited in the numerical ranges are also applicable.

Preferably, the rotation speed of the cubic boron nitride tool used in the second grinding treatment in step (2) is 100-300r/min, such as 100r/min, 120r/min, 140r/min, 160r/min, 180r/min, 200r/min, 220r/min, 240r/min, 260r/min, 280r/min or 300r/min, but not limited to the enumerated values, and other unrecited values in the numerical range are also applicable; the feed rate is 0.01 to 0.03mm/r, and may be, for example, 0.01mm/r, 0.015mm/r, 0.02mm/r, 0.025mm/r or 0.03mm/r, but is not limited to the values listed, and other values not listed in the numerical range are also applicable; the amount of the cut is 0.01 to 0.03mm, and may be, for example, 0.01mm, 0.012mm, 0.014mm, 0.016mm, 0.018mm, 0.02mm, 0.022mm, 0.024mm, 0.026mm, 0.028mm or 0.03mm, but is not limited to the values listed, and other values not listed in the numerical range are also applicable.

Preferably, the first grinding treatment in the step (1) and the second grinding treatment in the step (2) are respectively and independently performed under the condition of spray cooling.

Preferably, the spray comprises alcohol.

As a preferred technical solution of the present invention, the machining method of a silicon target according to the present invention includes the steps of:

(1) according to the shape of the target material, a cubic boron nitride cutter is used for carrying out primary grinding treatment on the silicon target material, the rotating speed of the cubic boron nitride cutter used for the primary grinding treatment is 200-400r/min, the feed rate is 0.05-0.3mm/r, and the feed rate is 0.01-0.3mm, so as to obtain a rough-processed silicon target material;

(2) and (2) carrying out secondary grinding treatment on the rough-processed silicon target material obtained in the step (1) by using a cubic boron nitride cutter, wherein the rotating speed of the cubic boron nitride cutter used in the secondary grinding treatment is 100-300r/min, the feed rate is 0.01-0.03mm/r, and the feed rate is 0.01-0.03mm, so as to obtain the silicon target material with a smooth surface.

The recitation of numerical ranges herein includes not only the above-recited numerical values, but also any numerical values between any of the above-recited numerical ranges not otherwise recited, and is not intended to be exhaustive or to limit the invention to the precise numerical values encompassed within the range for brevity and clarity.

Compared with the prior art, the invention has the following beneficial effects:

the processing method of the silicon target provided by the invention can effectively shorten the working procedure, save materials and ensure the machining precision and quality of the silicon target, thereby meeting the requirements of the size and the appearance of the target.

Drawings

FIG. 1 is a flow chart of a method of machining a silicon target according to the present invention.

Detailed Description

The technical solution of the present invention is further explained by the following embodiments. It should be understood by those skilled in the art that the examples are only for the understanding of the present invention and should not be construed as the specific limitations of the present invention.

Example 1

The present embodiment provides a method for machining a silicon target as illustrated in fig. 1, where the method for machining a silicon target includes the following steps:

(1) according to the shape of a target material, a cubic boron nitride cutter is used for carrying out primary grinding treatment on the silicon target material, the rotating speed of the cubic boron nitride cutter used in the primary grinding treatment is 200r/min, the feeding amount is 0.05mm/r, and the feed amount is 0.01mm, so that a rough machining silicon target material is obtained;

(2) and (3) carrying out secondary grinding treatment on the rough-machined silicon target material obtained in the step (1) by using a cubic boron nitride cutter, wherein the rotating speed of the cubic boron nitride cutter used in the secondary grinding treatment is 100r/min, the feeding amount is 0.01mm/r, and the feed amount is 0.01mm, so that the silicon target material with a smooth surface is obtained.

And the margin left at the edge of the rough-processed silicon target material is 0.05 mm.

The average grain diameter of boron nitride in the cubic boron nitride cutter used in the step (1) is 20 mu m; the average grain diameter of the boron nitride in the cubic boron nitride cutter used in the step (2) is 2 mu m.

The silicon target material processed by the mechanical processing method of the silicon target material provided by the embodiment can meet the requirements of product size and appearance. And (3) detecting the size precision and the surface roughness of the machined workpiece, wherein the quality of the machined workpiece meets the technical index requirements. When a 50-time microscope is used for observing the workpiece, the edge profile of the workpiece is very clear, the micro edge breakage condition is avoided, and the processing quality is good.

Example 2

The embodiment provides a machining method of a silicon target, which comprises the following steps:

(1) according to the shape of a target material, a cubic boron nitride cutter is used for carrying out primary grinding treatment on the silicon target material, the rotating speed of the cubic boron nitride cutter used in the primary grinding treatment is 400r/min, the feeding amount is 0.3mm/r, and the feed amount is 0.3mm, so that a rough machining silicon target material is obtained;

(2) and (3) carrying out secondary grinding treatment on the rough-machined silicon target material obtained in the step (1) by using a cubic boron nitride cutter, wherein the rotating speed of the cubic boron nitride cutter used in the secondary grinding treatment is 300r/min, the feeding amount is 0.03mm/r, and the feed amount is 0.03mm, so that the silicon target material with a smooth surface is obtained.

And the margin left at the edge of the rough-processed silicon target material is 0.10 mm.

The average grain diameter of boron nitride in the cubic boron nitride cutter used in the step (1) is 30 mu m; the average grain diameter of the boron nitride in the cubic boron nitride cutter used in the step (2) is 10 mu m.

The silicon target material processed by the mechanical processing method of the silicon target material provided by the embodiment can meet the requirements of product size and appearance. And (3) detecting the size precision and the surface roughness of the machined workpiece, wherein the quality of the machined workpiece meets the technical index requirements. When a 50-time microscope is used for observing the workpiece, the edge profile of the workpiece is very clear, the micro edge breakage condition is avoided, and the processing quality is good.

Example 3

The embodiment provides a machining method of a silicon target, which comprises the following steps:

(1) according to the shape of a target material, a cubic boron nitride cutter is used for carrying out primary grinding treatment on the silicon target material, the rotating speed of the cubic boron nitride cutter used in the primary grinding treatment is 300r/min, the feeding amount is 0.2mm/r, and the feed amount is 0.2mm, so that a rough machining silicon target material is obtained;

(2) and (3) carrying out secondary grinding treatment on the rough-machined silicon target material obtained in the step (1) by using a cubic boron nitride cutter, wherein the rotating speed of the cubic boron nitride cutter used in the secondary grinding treatment is 200r/min, the feeding amount is 0.02mm/r, and the feed amount is 0.02mm, so that the silicon target material with a smooth surface is obtained.

And the margin left at the edge of the rough-processed silicon target material is 0.08 mm.

The average grain diameter of boron nitride in the cubic boron nitride cutter used in the step (1) is 25 mu m; the average grain diameter of the boron nitride in the cubic boron nitride cutter used in the step (2) is 6 mu m.

The silicon target material processed by the mechanical processing method of the silicon target material provided by the embodiment can meet the requirements of product size and appearance. And (3) detecting the size precision and the surface roughness of the machined workpiece, wherein the quality of the machined workpiece meets the technical index requirements. When a 50-time microscope is used for observing the workpiece, the edge profile of the workpiece is very clear, the micro edge breakage condition is avoided, and the processing quality is good.

Example 4

The embodiment provides a machining method of a silicon target, which comprises the following steps:

(1) according to the shape of a target material, a cubic boron nitride cutter is used for carrying out primary grinding treatment on the silicon target material, the rotating speed of the cubic boron nitride cutter used in the primary grinding treatment is 400r/min, the feeding amount is 0.05mm/r, and the feed amount is 0.02mm, so that a rough machining silicon target material is obtained;

(2) and (3) carrying out secondary grinding treatment on the rough-machined silicon target material obtained in the step (1) by using a cubic boron nitride cutter, wherein the rotating speed of the cubic boron nitride cutter used in the secondary grinding treatment is 200r/min, the feeding amount is 0.02mm/r, and the feed amount is 0.02mm, so that the silicon target material with a smooth surface is obtained.

And the margin left at the edge of the rough-processed silicon target material is 0.06 mm.

The average grain diameter of boron nitride in the cubic boron nitride cutter used in the step (1) is 30 mu m; the average grain diameter of the boron nitride in the cubic boron nitride cutter used in the step (2) is 3 mu m.

The silicon target material processed by the mechanical processing method of the silicon target material provided by the embodiment can meet the requirements of product size and appearance. And (3) detecting the size precision and the surface roughness of the machined workpiece, wherein the quality of the machined workpiece meets the technical index requirements. When a 50-time microscope is used for observing the workpiece, the edge profile of the workpiece is very clear, the micro edge breakage condition is avoided, and the processing quality is good.

Example 5

This example provides a method for machining a silicon target, which is the same as in example 3 except that the rotational speed of the first grinding treatment in step (1) is changed to 180 r/min.

The rotating speed of the first grinding treatment is low, so that the effect of the first grinding treatment is poor, and the effect of the second grinding treatment is affected.

Example 6

This example provides a method of machining a silicon target, which is the same as in example 3 except that the rotation speed of the first grinding process in step (1) is changed to 440 r/min.

The first grinding treatment of the embodiment has high rotating speed, the grinding size is not easy to control, and the size of the processed silicon target material does not meet the requirement.

Example 7

This example provides a method of machining a silicon target, which is the same as in example 3 except that the feed amount of the first grinding treatment in step (1) was changed to 0.02 mm/r.

The feeding amount of the first grinding treatment of the embodiment is low, so that the first grinding treatment time is too long, and the time is wasted.

Example 8

This example provides a method of machining a silicon target, which is the same as in example 3 except that the feed amount of the first grinding treatment in step (1) is changed to 0.4 mm/r.

The feeding amount of the first grinding treatment is high, the grinding size is not easy to control, and the size of the processed silicon target material does not meet the requirement.

Example 9

This example provides a method for machining a silicon target, which is the same as that of example 3 except that the rotation speed of the second grinding treatment in step (2) is changed to 80 r/min.

The second grinding treatment of the embodiment has a low rotation speed, so that the second grinding treatment has poor effect, and the cutter used in the second grinding treatment is easily damaged.

Example 10

The present embodiment provides a method for machining a silicon target, which is the same as in embodiment 3 except that the rotation speed of the second grinding treatment in step (1) is changed to 400 r/min.

The second grinding treatment of the embodiment has higher rotating speed, the grinding size is not easy to control, and the size of the processed silicon target material does not meet the requirement.

Example 11

This example provides a method of machining a silicon target, which is the same as in example 3 except that the feed amount of the second grinding treatment in step (1) is changed to 0.05 mm/r.

The feeding amount of the second grinding treatment is high, the grinding size is not easy to control, and the size of the processed silicon target material does not meet the requirement.

Example 12

The present embodiment provides a machining method for a silicon target, which is the same as that in embodiment 3 except that the cubic boron nitride tool used in step (2) is replaced with a diamond grinding head.

By adopting the machining method for the silicon target provided by the embodiment, the silicon target has corner breakage or crack breakage in the second grinding treatment, and the requirements on the size and the appearance of the product cannot be met.

Comparative example 1

The present comparative example provides a machining method of a silicon target, the machining method of a silicon target including the steps of:

(1) cutting the silicon target material by using a tungsten steel milling cutter according to the shape of the target material to obtain a rough processed silicon target material;

(2) and (3) carrying out secondary grinding treatment on the rough-machined silicon target material obtained in the step (1) by using a cubic boron nitride cutter to obtain the silicon target material with a smooth surface.

By adopting the method for machining the silicon target material, the silicon target material has corner breakage or crack breakage in the cutting process, and the requirements on the size and the appearance of a product cannot be met.

In conclusion, the processing method of the silicon target provided by the invention can effectively shorten the working procedure, save materials and ensure the machining precision and quality of the silicon target, thereby obtaining the size and appearance requirements of the silicon target. And (3) detecting the size precision and the surface roughness of the machined workpiece, wherein the quality of the machined workpiece meets the technical index requirements.

The applicant declares that the above description is only a specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and it should be understood by those skilled in the art that any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are within the scope and disclosure of the present invention.