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Process for co-diffusing aluminium-rere-earth element in silicon titanocarbide material

A titanium silicon carbide and rare earth technology, which is applied in the field of aluminum-rare earth co-infiltration of titanium silicon carbide materials, can solve the problems of long operation time, difficult industrialization, complicated process, etc., and achieves improved anti-stripping performance, easy industrialization, and operation simple effect

Inactive Publication Date: 2004-06-02
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, not ideal coating thickness, and difficult industrialization
In addition, although aluminizing on superalloys is a relatively extensive protection technology, there is no relevant research on TiSiC 2 Reports on Al infiltration or Al-RE co-infiltration

Method used

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  • Process for co-diffusing aluminium-rere-earth element in silicon titanocarbide material
  • Process for co-diffusing aluminium-rere-earth element in silicon titanocarbide material

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Embodiment 1

[0017] In the present invention, the composition of the solid powder mixture used for aluminum-rare earth co-infiltration:

[0018] Aluminum powder (Al) purity ≥99.00%, particle size ≤0.4mm;

[0019] Rare earth oxide powder purity ≥99.00%, particle size ≤0.4mm;

[0020] Sodium fluoride (NaF) is of analytical grade.

[0021] The proportion of the solid powder mixture used for aluminum-rare earth co-infiltration (weight percentage):

[0022] Aluminum powder 5-30%; rare earth oxide powder 65-90%; sodium fluoride 0.5-5%.

[0023] In the corundum tank, a solid powder mixture composed of aluminum powder, rare earth oxide powder, and sodium fluoride is used to embed the sample of titanium silicon carbide body material, and then the corundum tank is placed in a system that can be vacuumed and filled with argon. in. First, the system is evacuated to 1-10Pa, then filled with argon (99.99%Ar) or helium (99.99%He), heated to 1000-1200℃ at a heating rate of 20-40℃ / min, and kept for 2-8 hours A...

Embodiment 2

[0034] The difference from embodiment 1 lies in: this embodiment Ti 3 SiC 2 The sample size is 10×5×2 mm; the composition of the seepage material (weight percentage): 25% aluminum powder, 74.5% yttrium oxide (Y 2 O 3 ) Powder, 0.5% sodium fluoride, the total weight is 150g; in the corundum tank, a solid powder mixture composed of aluminum powder, yttrium oxide powder, and sodium fluoride is used to embed the sample of titanium silicon carbide material, and then the corundum tank Placed in a system that can be evacuated and filled with argon. First, the system is evacuated to 10Pa, and then filled with argon (99.99% Ar). The temperature is raised to 1100°C. The temperature rise rate: 30°C / min. After holding for 2 hours, follow The furnace is cooled to room temperature, and the whole process of aluminum-yttrium co-infiltration is completed.

[0035] The surface of the infiltrated sample is smooth and off-white. Scanning electron microscope observation and X-ray diffraction analysis ...

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Abstract

A process for co-diffusing Al-rare-earth element into Ti3SiC2 material is characterized by that its diffusing material is composed of Al powder, rare-earth oxide powder and sodium fluoride powder. It is prepared by embedding the Ti3SiC2 material in the diffusing powder at 1000-1200 deg.C for 2-8 hr. When it is oxidized in the air at 1000-1200 deg.C, a complete Al2O3 surface layer is formed. It can be used in high-temp corrosion environment.

Description

Technical field [0001] The invention relates to surface engineering technology, in particular to a method for co-infiltrating titanium silicon carbide material with aluminum and rare earth. Background technique [0002] Titanium silicon carbide (Ti 3 SiC 2 ) Is a structure / function integrated material with excellent performance. It organically integrates the plasticity, electrical conductivity, heat conduction, easy processability of metal and the characteristics of high temperature resistance, thermal shock resistance, high strength and low specific gravity of ceramics. It is used as a high temperature Structural materials have broad application prospects. Although the titanium silicon carbide body material contains the oxidation-resistant element Si, it mainly forms titanium dioxide and a mixed oxide layer of titanium dioxide and silicon dioxide during the oxidation process, and has poor oxidation resistance above 1000°C. [0003] At present, for heat-resistant alloy materials,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B41/88C23C10/52
Inventor 李美栓张亚明刘光明周延春
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI