Preparation method of nano Cr3C2 crystal whisker

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...