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Method for preparing cobalt-based alloy layer on surface of TC4 titanium alloy

A technology of cobalt-based alloy and titanium alloy, which is applied in the direction of metal material coating process, coating, ion implantation plating, etc., can solve the problems of poor wear resistance and oxidation resistance, and achieve improved wear resistance and high temperature Anti-oxidation performance, high thermal efficiency, effect of improving heating and activation efficiency

Inactive Publication Date: 2013-02-20
高金菊
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the problems of poor wear resistance of titanium alloys and poor oxidation resistance above 600°C in the prior art, the present invention provides a method for preparing a cobalt-based alloy layer on the surface of TC4 titanium alloy, which can determine the The optimal process parameters of surface cobalt infiltration to improve the wear resistance and high temperature oxidation resistance of titanium alloys

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A kind of method of preparing cobalt-based alloy layer on the surface of TC4 titanium alloy of present embodiment 1, its steps are:

[0033] (1) After cutting the TC4 alloy into 25 mm x 30 mm x 6mm samples, the surface of the sample was polished with sandpaper, and then polished to a mirror surface with diamond abrasive paste;

[0034] (2) The source material of the double-layer glow plasma metallization furnace is a Stellite No. 6 cobalt-based alloy plate with a size of 100mm x 100mm x 5mm, and a clean TC4 titanium alloy sample is placed on the double-layer glow plasma metallization metallization furnace. Install the insulation cover (auxiliary cathode) on the cathode workbench in the vacuum chamber of the furnace, then adjust the distance between the source circle and the sample to the preset value, then lower the bell jar and seal the vacuum chamber; the double-layer glow plasma The source-cathode spacing of the metallization furnace was 18mm. The infiltration metal...

Embodiment 2

[0042] A kind of method for preparing cobalt-based alloy layer on the surface of TC4 titanium alloy of present embodiment 2, its steps are:

[0043] (1) After cutting the TC4 alloy into a sample with a size of 30 mm x 30 mm x 5mm, the surface of the sample was polished with sandpaper, and then polished to a mirror surface with diamond abrasive paste;

[0044] (2) The source material of the double-layer glow plasma metallization furnace is a Stellite No. 6 cobalt-based alloy plate with a size of 100mm x 90mm x 5mm, and a clean TC4 titanium alloy sample is placed on the double-layer glow plasma metallization metallization furnace. Install the insulation cover (auxiliary cathode) on the cathode workbench in the vacuum chamber of the furnace, then adjust the distance between the source circle and the sample to the preset value, then lower the bell jar and seal the vacuum chamber; the double-layer glow plasma The source-cathode spacing of the metallization furnace was 18 mm. The i...

Embodiment 3

[0052] A kind of method for preparing cobalt-based alloy layer on the surface of TC4 titanium alloy of present embodiment 3, its steps are:

[0053] (1) After cutting the TC4 alloy into 30 mm x 25 mm x 5mm samples, the surface of the sample was polished with sandpaper, and then polished to a mirror surface with diamond abrasive paste;

[0054] (2) The source material of the double-layer glow plasma metallization furnace is a Stellite No. 6 cobalt-based alloy plate with a size of 80mm x 100mm x 8mm, and the clean TC4 titanium alloy sample is placed on the double-layer glow plasma metallization metallization furnace. Install the insulation cover (auxiliary cathode) on the cathode workbench in the vacuum chamber of the furnace, then adjust the distance between the source circle and the sample to the preset value, then lower the bell jar and seal the vacuum chamber; the double-layer glow plasma The source-cathode spacing of the metallization furnace was 18 mm. The infiltration me...

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Abstract

The invention discloses a method for preparing a cobalt-based alloy layer on a surface of a TC4 titanium alloy and belongs to the field of titanium alloy surface processing. The method comprises that (1), a test sample is prepared; (2) the test sample is arranged on a working platform of a furnace, and a vacuum chamber is sealed; (3) a vacuum pump is opened, the inner portion of the furnace is pumped to the final vacuum, argon is filled, the inner portion of the furnace is pumped to the final vacuum again, and so repeats for 4-6 times; (4), argon is filled to 15-19Pa, cooling water is turned on, a sample power supply is switched on, and a sample is subjected to preliminary bombardment; (5), after the preliminary bombardment, the pressure is adjusted to the working air pressure, the source electrode voltage and the cathode voltage are adjusted to a preset value, and heat preservation is started; (6), after heat preservation is conducted for 1-2.5 hours, a source electrode power supply is turned off, the pressure is adjusted to 18-20Pa, the cathode voltage is reduced to 250-280V, and glow protection cooling is conducted; and (7), the air source and the cathode power supply are turned off, the inner portion of the furnace is pumped to the final vacuum again, and discharge is achieved after cooling. According to the method, a best parameter of a process when cobalt is infiltered into the surface of the titanium alloy can be determined, so that the high-temperature oxidation resistance of the titanium alloy is improved.

Description

technical field [0001] The invention belongs to the field of titanium alloy surface treatment, and more specifically relates to a method for preparing a cobalt-based alloy layer on the surface of a TC4 titanium alloy. Background technique [0002] Titanium and titanium alloys are an important structural material that emerged in the 1950s. Pure titanium is a light metal with a density of 4.52g / cm 3 , Titanium is widely distributed in the earth's crust, the world's reserves are about 3.4 billion tons, and its content ranks 10th among all elements. Titanium alloy is an alloy composed of titanium as the base material and other elements. Titanium has two kinds of allotropic crystals: below 882°C is close-packed hexagonal structure α-titanium, and above 882°C is body-centered cubic β-titanium. Alloying elements can be divided into three categories according to their influence on the phase transition temperature: ① The elements that stabilize the α phase and increase the phase t...

Claims

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Application Information

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IPC IPC(8): C23C14/16C23C14/38
Inventor 高金菊
Owner 高金菊
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