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Preparation method of nano Cr3C2 crystal whisker

A whisker and nano technology, applied in the field of preparation of inorganic non-metallic materials, can solve the technical problems of whisker preparation, shorten the reaction time, reduce the reaction temperature, and reduce the preparation cost

Inactive Publication Date: 2014-06-11
SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Currently, although Cr 3 C 2 The powder preparation technology is relatively mature, but due to the technical difficulties of whisker preparation, the Cr 3 C 2 The preparation of whiskers is still in the exploratory stage

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0015] Nano-Cr of the present invention 3 C 2 The preparation method of whisker, preparation step is as follows:

[0016] 1) Using ammonium dichromate, a carbonaceous reducing agent, and a halogenating agent as raw materials, place the above-mentioned raw materials in distilled water, and stir evenly to obtain a precursor solution; the carbonaceous reducing agent is one of glucose and sucrose, and the The halogenating agent is one of sodium chloride, potassium chloride, calcium chloride, barium chloride, lithium chloride or any two mixtures; based on 50 parts of the total mass of the three raw materials, ammonium dichromate is 22.72- 33.38 parts, 14.81-25.15 parts of carbonaceous reducing agent, 0.25-5 parts of halogenating agent, that is, the content of halogenating agent accounts for 0.5-10% of the total mass of raw materials; the amount of distilled water can fully dissolve the three raw materials.

[0017] 2) Put the precursor solution in a blast drying oven, and dry it ...

Embodiment 1

[0022] Dissolve 30.19g of ammonium dichromate, 14.81g of glucose and 5g of sodium chloride in 250ml of distilled water, and stir evenly to obtain a precursor solution; Dry at 700°C for 2 hours under Ar gas to obtain a fluffy precursor mixture; 3 C 2 whiskers; 4) the unpurified nano-Cr 3 C 2 Whiskers are decarburized by firing at 500°C for 8 hours in air, and then Cr is removed in HF solution 2 o 3 , and finally washed and dried to obtain nano-Cr with whisker diameter less than 100nm 3 C 2 whiskers.

Embodiment 2

[0024] Dissolve 24.35g of ammonium dichromate, 25.15g of glucose and 0.5g of lithium chloride in 250ml of distilled water, and stir evenly to obtain a precursor solution; Dry for 4 hours under the same conditions to obtain a fluffy precursor mixture; 3) Put the precursor mixture in a carbon tube furnace, and keep it at 750 ° C for 1.5 hours under vacuum conditions for carbothermal reaction to obtain unpurified nano-Cr 3 C 2 whiskers; 4) the unpurified nano-Cr 3 C 2 Whiskers are decarburized by firing at 550°C in air for 5 hours, and then Cr is removed in HF solution 2 o 3 , and finally washed and dried to obtain nano-Cr with whisker diameter less than 100nm 3 C 2 whiskers.

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Abstract

The invention discloses a preparation method of a nano Cr3C2 crystal whisker. The preparation method comprises the following steps: (1), by taking ammonium dichromate, a carbonaceous reducing agent and a halogenating agent as materials, placing the materials into distilled water, and uniformly stirring to prepare precursor liquor; (2), drying the precursor liquor to obtain a fluffy precursor mixture; (3), placing the precursor mixture into a reaction furnace, preserving heat for 0.5 hour-2 hours to carry out carbothermic reaction at a temperature of 700 DEG C-900 DEG C under an Ar gas or vacuum condition to obtain unpurified nano Cr3C2 crystal whisker; and (4), firing the unpurified nano Cr3C2 crystal whisker for 2 hours-8 hours at the temperature of 500 DEG C-600 DEG C in air for decarburization, removing Cr2O3 in HF liquor, and cleaning and drying to obtain the nano Cr3C2 crystal whisker with diameter smaller than 100 nm. The preparation method disclosed by the invention is simple in process, easily controllable in parameter and low in cost; the surface of the prepared Cr3C2 crystal whisker is smooth, and the crystal whisker diameter is smaller than 100 nm.

Description

technical field [0001] The present invention relates to chromium carbide (Cr 3 C 2 ) preparation, specifically refers to a nano-Cr 3 C 2 The preparation method of whiskers belongs to the field of preparation of inorganic non-metallic materials. Background technique [0002] Carbide whiskers have the advantages of high melting point, hardness, modulus, etc., and are mainly used to prepare composite materials such as ceramic matrix, metal matrix, and resin matrix to improve the strength, toughness, and wear resistance of materials. Electronics, machinery, metallurgy, aerospace, new materials and other industrial fields have a wide range of uses. Compared with other carbides, Cr 3 C 2 It has a series of unique properties: ①Good high temperature oxidation resistance, can serve for a long time at 800-1000℃; ②Excellent corrosion resistance; ③Good thermal conductivity; ④Non-magnetic; ⑤The coefficient of thermal expansion is close to that of steel. Therefore, Cr 3 C 2 Whisk...

Claims

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Application Information

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IPC IPC(8): C30B29/36C30B29/62C30B1/10
Inventor 金永中叶发明附青山刘东亮陈昌浩
Owner SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING
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