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Method of forming boride coating layer on Ti3 SiC2 material surface

A boride and coating technology, applied in metal material coating process, coating, solid diffusion coating and other directions, can solve the problems of high cost, long operation time, large power consumption, etc., and achieve excellent wear resistance, High surface hardness and practical effect

Inactive Publication Date: 2005-05-25
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages of this process are: complex process, long operation time, large power consumption, high cost, loose and porous coating is not ideal, and it is not easy to industrialize
However, although boronizing on metal is a relatively extensive chemical heat treatment method, there is no relevant information on Ti 3 SiC 2 boronizing

Method used

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  • Method of forming boride coating layer on Ti3 SiC2 material surface
  • Method of forming boride coating layer on Ti3 SiC2 material surface

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] The composition of the solid powder mixture of the present invention: boron carbide powder purity ≥ 90%, particle size ≤ 0.4 mm; silicon carbide powder purity ≥ 88.5%, particle size ≤ 0.2 mm; silicon powder purity ≥ 99.00%, particle size ≤ 0.4 mm; potassium fluoroborate is Analytical pure; Sodium fluoride is analytically pure.

[0017] The specific data of this embodiment are: Ti 3 SiC 2 The size of the sample is 5×5×2 mm, and the composition of the powder mixture is by weight percentage: 64% boron carbide, 32% silicon carbide, 1% silicon, 2% potassium fluoroborate, 1% sodium fluoride, and the total weight is 100g. Fill it with argon (99.99% Ar), the heating temperature is 1300°C, the heating rate is 8°C / min, the holding time is 8 hours, and the sample is taken out after the furnace is cooled to room temperature.

[0018] X-ray diffraction analysis shows that after the above process, Ti 3 SiC 2 A titanium diboride coating is mainly formed on the surface of the mater...

Embodiment 2

[0020] The difference from Example 1 is: Ti 3 SiC 2 The material sample is 5×5×2 mm, and the composition of the powder mixture is by weight percentage: 45% boron carbide, 50% silicon carbide, 2% silicon, 2% potassium fluoroborate, 1% sodium fluoride, and the total weight is 100g. Fill it with helium (99.99% He), the heating temperature is 1400°C; the heating rate is 6°C / min, and the holding time is 6 hours. The samples were taken out after the furnace was cooled to room temperature.

[0021] Tested at Ti 3 SiC 2 A titanium diboride coating about 36 microns thick is formed on the surface of the material sample. By measuring the mass change of the sample after infiltration, the amount of infiltration is 2.75mg / cm 2 . The surface Vickers hardness is about 24GPa. The surface of the infiltrated sample is smooth and off-white. Observation of the cross-section shows that the coating is continuous and complete, and well combined with the substrate.

Embodiment 3

[0023] The difference from Example 1 is: Ti 3 SiC 2 The material sample is 5×5×2 mm, and the composition of the powder mixture is by weight percentage: 50% boron carbide, 46% silicon carbide, 1% silicon, 2% potassium fluoroborate, 1% sodium fluoride, and the total weight is 100g. The heating temperature is 1100°C; the heating rate is 6°C / min, and the holding time is 10 hours. The samples were taken out after the furnace was cooled to room temperature.

[0024] Tested at Ti 3 SiC 2 A titanium diboride coating about 5 microns thick is formed on the surface of the material sample. By measuring the mass change of the sample after infiltration, the amount of infiltration is 0.35mg / cm 2 . The surface Vickers hardness is about 22GPa. The surface of the infiltrated sample is smooth and silvery white. Cross-section observation, due to the Ti 3 SiC 2 The material contains impurity phase SiC, the coating is not covered in SiC, and the rest is well combined with the substrate.

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Abstract

A process for generating a boride layer on the surface of Ti3SiC2 material includes proportionally mixing boron carbide powder, silicon carbide powder, silicon powder, potassium fluoroborate powder and sodium fluoride powder, burying the Ti3SiC2 material in said powder mixture, and heating at 1000-1200 deg.C for 2-10 hr for thermal diffusion to form TiB2 layer, which has high hardness.

Description

technical field [0001] The invention belongs to surface engineering technology, in particular to a 3 SiC 2 A method of forming a boride coating on the surface of a material. Background technique [0002] Ti 3 SiC 2 It is a structural / functional integrated material with excellent performance. It organically combines the plasticity, electrical conductivity, thermal conductivity, and ease of processing of metals with the characteristics of high temperature resistance, thermal shock resistance, high strength and low specific gravity of ceramics. As a high temperature structure Materials and molten salt electrolysis electrodes have broad application prospects, and are currently receiving great attention from researchers. [0003] But Ti 3 SiC 2 The hardness is lower and the wear resistance is poor. Therefore, it is necessary to increase the surface hardness of the material and improve its wear resistance through surface strengthening to realize its practical application. ...

Claims

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Application Information

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IPC IPC(8): C23C8/68
Inventor 李超张亚明李美栓周延春
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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