Preparation method of TiB2 ceramic powder

Abstract

The invention relates to a preparation method of TiB2 ceramic powder. The preparation method comprises the steps: preparing materials according to the mass ratio of a reductant to a titanium source toa boron source to an alkali metal compound-containing molten salt of 1.0:(0.7-1.2):(0.7-4.0):(0.2-20.0), mixing evenly, carrying out heat treatment for 0.5-8 h under conditions of a protective atmosphere and the temperature of 600-1300 DEG C, dissolving in water or an alkali solution under a condition of room temperature-250 DEG C, washing, and drying, to prepare the TiB2 ceramic powder. The reductant is one or more of silicon powder and aluminum powder; the titanium source is one or more of Ti powder and TiO2 powder; the boron source is one or more of boron oxide, boric acid, sodium tetraborate, potassium tetraborate and lithium tetraborate; the alkali metal compound-containing molten salt is one or more of sodium hydroxide, sodium silicate, sodium carbonate, potassium hydroxide, potassium silicate, potassium carbonate, lithium hydroxide, lithium silicate, lithium carbonate and sodium aluminate. The preparation method has the advantages of low production cost, environmental friendliness and easy industrialized production, and the prepared product has small particle size and narrow particle size distribution.

Description

technical field [0001] The invention belongs to the technical field of boride ceramic powder. Specifically related to a TiB 2 Preparation method of ceramic powder. Background technique [0002] TiB 2 It is the most stable compound of boron and titanium. It has excellent characteristics such as high melting point (2980°C), high hardness, high strength, chemical inertness, good wear resistance and excellent corrosion resistance, and no phase change in solid state. It has a wide range of applications in the fields of conductive ceramics, ceramic cutting tools and molds, cathode coating materials for aluminum electrolytic cells, cermets, and ceramic matrix composite materials. TiB 2 The base material has excellent mechanical, thermophysical, chemical and friction properties, and can serve in extreme environments, such as nuclear reactor cladding materials, hypersonic aircraft nose cone materials, etc. [0003] TiB 2 The particle size, particle size distribution, agglomerat...

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Problems solved by technology

However, the raw material cost of the above method is high, which limits the commercial application

[0005] The high temperature self-propagating synthesis method is also TiB 2 A main method of ceramic powder synthesis is through metal magnesium and B 2 o 3 and TiO 2 Self-propagating reaction to synthesize TiB 2 (Fu Zhengyi, Yuan Runzhang. TiB 2 Research on the self-propagating high-temperature synthesis process of [J]. Chinese Journal of Ceramics, 1995 (1): 27-32.), but the process control of the self-propagating reaction and the subsequent purification of the reaction product are more complicated

[0006] The mechanical alloying of Ti powder and B powder can also be used to prepare TiB 2 Ceramic powder, mechanical alloying (Yan Bingyong. Preparation of TiB by mechanical alloying 2 Powder [M]. Kunming University of Science and Technology, 2011.) The main problem of powder preparation is the pollution caused by the ball milling medium and container, and the stoichiometric ratio of the product cannot be precisely controlled

[0007] Based on the above analysis, the existing TiB 2 There are different degrees of problems in the synthesis method of ceramic powder, such as high cost of raw materials, high reaction temperature, synthetic TiB 2 The ceramic powder size is difficult to control, the activity is low and the impurity content of the product powder is high, and the environmental pollution of the subsequent acid treatment purification process is serious, etc.

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