1. A surface shot blasting method for zirconium and zirconium alloy is characterized by comprising the following steps:

the method comprises the steps of carrying out shot blasting on zirconium and zirconium alloy, wherein steel shots with the granularity of 2-12 mm are adopted as shot blasting shots, the pressure of compressed air is 0.05-0.8 MPa during shot blasting, the flow rate of the shot blasting shots is 0.05-1 kg/min, and the moving speed of a shot blasting nozzle is 1-5 m/min.

2. The method of claim 1, wherein the shot is made of steel shot with a grain size of 4mm, the pressure of compressed air during the shot blasting is 0.2MPa, the flow rate of the shot blasting is 0.1kg/min, and the moving speed of the shot blasting nozzle is 1.5 m/min.

3. The method of claim 1, wherein the shot is a 6mm steel shot, the pressure of compressed air during the shot blasting is 0.4MPa, the flow rate of the shot blasting is 0.3kg/min, and the moving speed of the shot blasting nozzle is 3 m/min.

4. The method for surface blasting of zirconium and zirconium alloys according to claim 1, 2 or 3 wherein the steel shot has a hardness HRC of 40 to 50, a carbon content of 0.8 to 1.2 wt%, a manganese content of 0.6 to 1.0 wt%, a silicon content of 0.4 to 1.2 wt%, a sulfur content of 0.05 wt% or less, and a phosphorus content of 0.05 wt% or less.

5. The method of claim 1, wherein said peening is performed with a pressure sander.

Background

Zirconium and zirconium alloys have the advantages of light specific gravity, high specific strength, good heat resistance, strong corrosion resistance and the like, and are widely applied to the fields of precision machinery, aerospace and the like. Meanwhile, zirconium and zirconium alloy also have good comprehensive mechanical properties. But the plastic shear resistance is low, the surface friction factor is large, the abrasion resistance is poor, and the service life is greatly shortened. Therefore, surface modification techniques have been used to improve various applications.

At present, methods for improving the wear resistance of zirconium and zirconium alloys comprise micro-arc oxidation and anodic oxidation. Before pre-oxidation, some people adopt shot blasting technology to remove oil stains, alkaline substances and the like on the surfaces of zirconium and zirconium alloy. The shot blasting process is used as a surface treatment process before pre-oxidation, has simple process requirements, can improve the hardness and strength of a surface layer, change the stress state, improve the fatigue strength of the material and prolong the fatigue life, and obtains better effect. However, the existing zirconium and zirconium alloy materials still have the problem of poor wear resistance.

Disclosure of Invention

In view of the above, the present invention provides a method for shot blasting on the surface of zirconium and zirconium alloy. The surface shot blasting method can improve the wear resistance of the zirconium and zirconium alloy materials, prolong the effective service life of the zirconium and zirconium alloy, and expand the application field of the zirconium and zirconium alloy.

In order to achieve the above object, the present invention provides the following technical solutions:

the invention provides a method for shot blasting on the surfaces of zirconium and zirconium alloy, which comprises the following steps:

the method comprises the steps of carrying out shot blasting on zirconium and zirconium alloy, wherein steel shots with the granularity of 2-12 mm are adopted as shot blasting shots, the pressure of compressed air is 0.05-0.8 MPa during shot blasting, the flow rate of the shot blasting shots is 0.05-1 kg/min, and the moving speed of a shot blasting nozzle is 1-5 m/min.

Preferably, the shot adopts steel shots with the granularity of 4mm, the pressure of compressed air is 0.2MPa during shot blasting, the flow rate of the shot blasting shot is 0.1kg/min, and the moving speed of a shot blasting nozzle is 1.5 m/min.

Preferably, the shot adopts steel shots with the granularity of 6mm, the pressure of compressed air is 0.4MPa during shot blasting, the flow rate of the shot blasting shot is 0.3kg/min, and the moving speed of a shot blasting nozzle is 3 m/min.

Preferably, the hardness HRC of the steel shot is 40-50, the carbon content of the steel shot is 0.8-1.2 wt%, the manganese content is 0.6-1.0 wt%, the silicon content is 0.4-1.2 wt%, the sulfur content is less than or equal to 0.05 wt%, and the phosphorus content is less than or equal to 0.05 wt%.

Preferably, the blasting is performed using a pressure type blasting machine.

The invention provides a zirconium and zirconium alloy surface shot blasting method, which is used for shot blasting of zirconium and zirconium alloy, wherein shot blasting adopts steel shots with the granularity of 2-12 mm, the compressed air pressure is 0.05-0.8 MPa during shot blasting, the flow rate of the shot blasting shots is 0.05-1 kg/min, and the moving speed of a shot blasting nozzle is 1-5 m/min.

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

the method carries out shot blasting treatment on the surfaces of zirconium and zirconium alloy, and the structural defects in the processing of the zirconium and zirconium alloy are overcome through surface shot blasting, so that the surfaces of the zirconium and zirconium alloy are changed from the original uneven tensile stress state to the even compressive stress state, the cracking probability of an oxide film generated under the tensile stress is reduced, the bonding strength between the oxide film generated under the compressive stress and a matrix is enhanced, and the oxide film is compact; the shot blasting also plays a role in refining grains, and the bonding strength of the matrix and the oxide film is enhanced through refining the grains, so that the adaptivity, the toughness and the self-healing capability of the oxide film are improved, the wear resistance of the zirconium and the zirconium alloy is improved, the effective service life of the zirconium and the zirconium alloy is prolonged, and the application field of the zirconium and the zirconium alloy is expanded. The shot blasting shot adopts steel shots with different granularities, compressed air pressure during shot blasting, shot blasting shot flow and shot blasting nozzle moving speed to judge the wear resistance. Meanwhile, the zirconium alloy also has good biocompatibility and comprehensive mechanical property, and can be used as biomedical materials of dental implants, artificial joints and the like.

Drawings

FIG. 1 is a sectional view of surface shot blasting of zirconium according to a first embodiment of the present invention.

Detailed Description

The invention provides a method for shot blasting on the surfaces of zirconium and zirconium alloy, which comprises the following steps:

the method comprises the steps of carrying out shot blasting on zirconium and zirconium alloy, wherein steel shots with the granularity of 2-12 mm are adopted as shot blasting shots, the pressure of compressed air is 0.05-0.8 MPa during shot blasting, the flow rate of the shot blasting shots is 0.05-1 kg/min, and the moving speed of a shot blasting nozzle is 1-5 m/min.

In the invention, the shot is preferably steel shot with the granularity of 4mm, the pressure of compressed air during shot blasting is preferably 0.2MPa, the flow rate of shot blasting is preferably 0.1kg/min, and the moving speed of a shot blasting nozzle is preferably 1.5m/min or

The shot material is preferably steel shot with the granularity of 6mm, the compressed air pressure during shot blasting is preferably 0.4MPa, the flow rate of the shot blasting shot material is preferably 0.3kg/min, and the moving speed of a shot blasting nozzle is preferably 3 m/min.

In the invention, the hardness HRC of the steel shot is preferably 40-50, the carbon content of the steel shot is preferably 0.8-1.2 wt%, the manganese content is preferably 0.6-1.0 wt%, the silicon content is preferably 0.4-1.2 wt%, the sulfur content is preferably less than or equal to 0.05 wt%, and the phosphorus content is preferably less than or equal to 0.05 wt%.

In the present invention, the blasting is preferably performed by a pressure type blasting machine.

The method preferably prepares zirconium and zirconium alloy to be shot-blasted, loads steel shots into a sand tank, opens an air compressor, adjusts the pressure of compressed gas, adjusts the flow rate of the shots and starts shot blasting.

In the present invention, after the completion of the shot blasting, the surface shot blasting roughness Ra of the obtained zirconium and zirconium alloy is preferably 0.2 to 1.5 μm.

In order to further illustrate the present invention, the method for surface blasting zirconium and zirconium alloy according to the present invention is described in detail with reference to the following examples, which should not be construed as limiting the scope of the present invention.

The first embodiment is as follows:

a surface shot blasting process of zirconium comprises the following steps:

(1) adopting a pressure type sand blasting machine;

(2) the shot blasting material on the surface of the zirconium adopts 4mm steel shots;

(3) the pressure of the shot blasting compressed air on the surface of the zirconium is 0.20 MPa;

(4) the flow rate of the shot blasting material on the surface of the zirconium is 0.1 kg/min;

(5) the moving speed of the shot-blasting nozzle on the surface of the zirconium is 1.5 m/min.

FIG. 1 is a sectional view of surface shot blasting of zirconium according to the first embodiment of the present invention, in which the left side shows the shot blasting surface, and the surface grains are refined to close the structural defects in zirconium.

The preparation method of the zirconium strip with the specification of 100mm multiplied by 200mm multiplied by 5mm to be subjected to shot blasting comprises the steps of filling steel shots into a sand tank, opening an air compressor, adjusting the pressure of compressed gas according to the process, adjusting the flow rate of the shots, and starting shot blasting to obtain the surface shot blasting roughness of the zirconium and the zirconium alloy of Ra1.32 mu m.

Taking the zirconium and zirconium alloy subjected to shot blasting as test materials, and carrying out a zirconium wear resistance effect test in a laboratory under the lubrication of a sodium hyaluronate solution and under the load of 8-12N: the results show that the friction factor of the peened zirconium material was 0.031 in sodium hyaluronate solution lubrication.

Example two:

a surface shot blasting process of zirconium comprises the following steps:

(1) adopting a pressure type sand blasting machine;

(2) the shot blasting material on the surface of the zirconium adopts 6mm steel shots;

(3) the pressure of the shot blasting compressed air on the surface of the zirconium is 0.40 MPa;

(4) the flow rate of the shot blasting material on the surface of the zirconium is 0.3 kg/min;

(5) the moving speed of the shot-blasting nozzle on the surface of the zirconium is 3 m/min.

The preparation method of the zirconium strip with the specification of 100mm multiplied by 200mm multiplied by 5mm to be subjected to shot blasting comprises the steps of filling steel shots into a sand tank, opening an air compressor, adjusting the pressure of compressed gas according to the process, adjusting the flow rate of the shots, and starting shot blasting to obtain the zirconium strip with the surface shot blasting roughness of Ra0.63 mu m.

Taking the zirconium and zirconium alloy subjected to shot blasting as test materials, and carrying out wear resistance effect test on the zirconium and zirconium alloy in a laboratory under the condition of lubricating by a sodium hyaluronate solution and under the load of 8-12N: the results show that the friction factor of the peened zirconium material was 0.024 in sodium hyaluronate solution lubrication.

The foregoing is merely a preferred embodiment of the invention and is not intended to limit the invention in any manner. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, several improvements and modifications can be made, and these improvements and modifications should also be construed as the protection scope of the present invention.