A kind of nano-rod zirconium boride powder and preparation method thereof

Abstract

The invention relates to nano rodlike zirconium boride powder and a preparation method thereof. According to the technical scheme, the preparation method comprises the step of uniformly mixing, by weight, 27-39% of zirconium oxide powder, 8-16% of boron carbide powder, 4-8% of non-formalized carbon powder, 12-26% of sodium chloride powder and 24-36% of potassium chloride powder, so that a mixture is obtained; putting a crucible containing the mixture into a saggar, then placing the saggar in a microwave oven, preserving the temperature for 20-40 minutes under the conditions that the vacuum degree is 10-50 Pa, argon atmosphere is provided, and the temperature ranges from 1000 DEG C to 1200 DEG C, conducting natural cooling, then conducting cleaning with deionized water, and preserving the temperature for 6-12 hours at the temperature of 65-80 DEG C in a vacuum drying box, so that the nano rodlike zirconium boride powder is obtained. The preparation method has the advantages of being low in cost, simple in process, low in reaction temperature, high in reaction velocity, suitable for industrialized production and environmentally friendly, and the obtained nano rodlike zirconium boride powder is high in purity, of a uniform rodlike structure, controllable in dimension, large in specific surface area and good in sintering property.

Description

technical field [0001] The invention belongs to the technical field of zirconium boride powder. Specifically relates to a nano-rod zirconium boride powder and a preparation method thereof. Background technique [0002] As a representative of new ultra-high temperature ceramics, zirconium boride ceramics have low density, high melting point, high hardness, high specific strength, high specific stiffness, good thermal conductivity, excellent electrical conductivity, excellent ablation resistance and oxidation resistance It is considered to be one of the most promising structural / functional integrated materials, and has been widely used in aerospace, military manufacturing, metallurgy, minerals, and mechanical processing. The current main method for preparing zirconium boride ceramics is to sinter zirconium boride powder under high temperature and high pressure conditions. Therefore, the preparation of zirconium boride powder with high purity and good sintering performance is...

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Problems solved by technology

However, the existing thermal reduction method still needs to use expensive or toxic raw materials, as well as high energy consumption conditions such as high synthesis temperature and long holding time, and it is difficult to form a uniform rod-like structure: "Using zirconium-containing organic precursors to synthesize borides Preparation method of zirconium powder material" (CN102557642A) patented technology, using high-priced zirconium-containing organic precursors, glucose and boric acid as raw materials, and heat treatment at 1300-1700°C for 1-5 hours to obtain zirconium boride powder. But it has not been reported to have a rod-like structure; "A method for preparing zirconium boride powder with a rod-like shape" (CN201210506176.5) patent technology, using zirconium dioxide, boron carbide and graphite as raw materials, first undergoes ball milling and pressing Pretreatment of the billet, etc., and then heat treatment at 1200-1800°C for 0.5-5 hours to obtain a zirconium boride powder with a rod-shaped particle content of only 90wt%; "Preparation process of rod-shaped zirconium boride powder" (CN201410116048. 9) Patented technology, using toxic zirconium tetrachloride as raw material to prepare rod-shaped zirconia, and preparing carbon powder by cracking and pulverizing phenolic resin, and then mixing the above-mentioned zirconia and carbon powder with boron carbide and then heat preservation at 1600-1800°C for 0.5 ~ 2 hours of heat treatment, obtained boron carbide powder with aspect ratio of only 2 times or more

[0005] In summary, the existing methods for preparing zirconium boride powder generally have disadvantages such as high raw material cost, complicated process, high reaction temperature, low reaction rate, lack of uniform rod structure, difficulty in industrial production and environmental pollution.

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