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A method for preparing cr7c3/crb composite powder by solid phase reaction diffusion method

A composite powder, solid-phase reaction technology, applied in chemical instruments and methods, carbon compounds, boron/borides, etc., can solve the problems of inability to obtain chromium carbide composite powder, high processing temperature, etc., to simplify equipment and processes. Process, powder composition uniformity, cost-saving effect

Inactive Publication Date: 2016-02-24
NORTHWEST A & F UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method requires a vacuum electric furnace and a very high processing temperature; at the same time, it cannot obtain chromium carbide composite powder

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A kind of solid phase reaction diffusion method to prepare Cr 7 C 3 / CrB composite powder method, comprising the following steps:

[0021] (1) Fully mix the dry boron carbide powder and metal chromium powder mixed powder in proportion, the molar ratio of the boron carbide powder to the metal chromium powder is 2, and the average particle diameter of the boron carbide powder is 0.2 μm, the average particle size of the metal chromium powder is 1 μm.

[0022] (2) packing the mixed powder obtained in step (1) into a stainless steel inner layer container with a chromium content of 20%, and sealing the stainless steel inner layer container;

[0023] (3) Put the stainless steel inner container into a stainless steel outer container with a chromium content slightly larger than the diameter of the stainless inner container, and put an appropriate amount of chromium or titanium powder or particles, powder The dosage is about 10% of the capacity of the outer container, and the ...

Embodiment 2

[0026] A kind of solid phase reaction diffusion method to prepare Cr 7 C 3 / CrB composite powder method, comprising the following steps:

[0027] (1) Fully mix the dry boron carbide powder and metal chromium powder mixed powder in proportion, the molar ratio of the boron carbide powder to the metal chromium powder is 3, and the average particle diameter of the boron carbide powder is 0.6 μm, the particle size of the metal chromium powder is 3 μm.

[0028] (2) packing the mixed powder obtained in step (1) into a stainless steel inner layer container with a chromium content of 25%, and sealing the stainless steel inner layer container;

[0029] (3) Put the stainless steel inner container into a stainless steel outer container with a chromium content of 25% slightly larger than the diameter of the stainless inner container, and put an appropriate amount of chromium or titanium powder or particles, the amount of powder It is about 25% of the capacity of the outer layer containe...

Embodiment 3

[0032] A kind of solid phase reaction diffusion method to prepare Cr 7 C 3 / CrB composite powder method, comprising the following steps:

[0033] (1) fully mix the dry boron carbide powder and the metal chromium powder mixed powder in proportion, the mass ratio of the boron carbide powder and the metal chromium powder is 4, and the particle diameter of the boron carbide powder is 10 μm, The particle size of the metal chromium powder is 5 μm.

[0034] (2) packing the mixed powder obtained in step (1) into a stainless steel inner container with a chromium content of 21%, and sealing the stainless steel inner container;

[0035] (3) Put the stainless steel inner container into a stainless steel outer container with a chromium content of 21% slightly larger than the diameter of the stainless inner container, and put an appropriate amount of chromium or titanium powder or particles, the amount of powder It is about 30% of the capacity of the outer layer container, and the stainles...

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Abstract

The invention relates to a method for preparing Cr7C3 / CrB composite powder by utilizing a solid-phase reaction diffusion process, belonging to the technical field of the preparation of ceramic composite powder. The method comprises the following steps: (1) fully mixing dried boron carbide powder and chromium metal powder in proportion; (2) putting the mixed powder obtained by the step (1) into a stainless steel inner-layer container, and sealing the stainless steel inner-layer container; (3) putting the stainless steel inner-layer container into a stainless steel outer-layer container which is made of the same material with the stainless steel inner-layer container and is slightly larger than the stainless steel inner-layer container, and putting a proper amount of chromium or titanium powder or particles; (4) performing constant-temperature treatment on the stainless steel outer-layer container in a high-temperature furnace. According to the method, the composite powder is prepared in a solid-phase reaction and in-situ reaction diffusion manner under a sealed system, so that the composite powder is uniform in composition. A complex vacuum or atmosphere furnace is not required, and the composite powder is prepared at relatively low temperature. The composite powder is prepared by only taking the boron carbide powder and the chromium powder as raw materials, and the other auxiliary raw materials and an intermediate process are omitted, so that the process is simple.

Description

technical field [0001] The invention relates to a method for preparing Cr by solid phase reaction diffusion method 7 C 3 A method for / CrB composite powder belongs to the technical field of ceramic composite powder preparation. Background technique [0002] Chromium carbide including Cr 3 C 2 , Cr 7 C 3 and Cr 23 C 6 And other different crystal structures, with high hardness, high melting point, good corrosion resistance and wear resistance. And CrB, Cr 3 B 4 and CrB 2 It has the characteristics of high melting point, high electrical conductivity and high hardness. However, such materials have extremely strong covalent bonds and low volume diffusion rates, making their sintering and densification very difficult; at the same time, single ceramics have disadvantages such as poor thermal shock resistance and low fracture toughness. Studies have shown that in CrB 2 Introducing Cr into the powder 3 C 2 Powder can not only promote CrB 2 Sintering densification of c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B31/30C01B35/04C01B32/914
Inventor 吴守军郭强郭斌吴思远
Owner NORTHWEST A & F UNIV
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