TiC powder preparation method taking tetrabutyl titanate and phenolic resin serving as titanium source and carbon source respectively

Abstract

The invention discloses a TiC powder preparation method taking tetrabutyl titanate and a phenolic resin serving as a titanium source and a carbon source respectively. The method comprises the steps that tetrabutyl titanate and phenolic resin are weighted in a mass ratio of 1: (5-9), and respectively dissolved in absolute ethyl alcohol to prepare saturated solutions; the two saturated solutions are mixed together uniformly, then deionized water with equal volume is dropwise added in the mixed solution to prepare mixed gel, the mixed gel is dried for 36-48 hours at the temperature ranging from 100 DEG C to 150 DEG C, and precursor is prepared; the precursor is heated to 1,500 DEG C-2,000 DEG C under the protection of hydrogen atmosphere, the heat preservation is performed for 1-2 hours, carbon thermal reduction is performed, and then TiC powder is prepared; purity of chemical reagents and raw materials are analytically pure and above; and components of the prepared TiC powder are controlled by an added raw material ratio, and purity and granularity are commonly determined by charging sequences and preparation technics. The method disclosed by the invention has the advantages of uniform mixing of the raw materials, simple processing, low synthetic temperature, short synthetic time, energy conservation, environment protection and the like.

Description

technical field [0001] The invention belongs to the technical field of TiC powder preparation, in particular to a method for preparing TiC powder by using tetrabutyl titanate and phenolic resin as titanium source and carbon source respectively. Background technique [0002] TiC has the characteristics of high melting point, high hardness, high wear resistance and special functionality. It is not only widely used in abrasive tools, cutting tools and reinforcements of composite materials, but also widely used as energy materials, such as nuclear energy materials. Utilization, the coating material of TiC can resist H + Ion radiation and resistance to large temperature gradients and thermal cycles, the anti-tritium permeation layer of these coating materials is stable for a long time. In terms of infrared radiation ceramic materials, the addition of TiC to the cordierite structure is not only introduced as a conductive phase , and itself is an excellent near-infrared radiation ...

AI Technical Summary

Problems solved by technology

[0006] The direct carbonization method is based on elemental carbon, metal titanium powder (or TiH 2 ) as raw material, under high temperature, inert atmosphere or vacuum, the reactants directly contact and react to generate TiC, the product has high purity, large carbon metering ratio, and the process is simple, but the price of titanium powder is expensive, and the preparation of ultrafine titanium powder is difficult ; The reaction process is difficult to control, and the synthesized TiC needs to be further pulverized and broken, resulting in a reduction in the purity of the product, and further purification is required, so that the preparation of ultrafine TiC powder by this method has not been widely promoted

[0007] The carbothermal reduction method is a traditional method for the industrial production of TiC powder. The process uses TiO 2 As titanium source, graphite, carbon black, activated carbon, etc. are used as C source, under high temperature and protective atmosphere, TiO 2 It is reduced by C to form TiC powder. The advantages are: low cost of raw materials; simple process and high production efficiency; the particle size of TiC is micron, but the uniformity of raw materials is poor through mechanical mixing; the remaining carbon black is processed by combustion method, and TiC is also easy Oxidized; as far as the current production technology is concerned, the synthesized powder cannot fully meet the requirements of fine ceramics in terms of particle size and purity

[0008] There are other methods to prepare ultra-fine TiC, but generally speaking, there are high raw material requirements such as high-purity metal titanium powder, organic compounds of titanium, etc.; the synthesis process is complicated, such as plasma heating, microwave heating, vapor deposition, etc., equipment Problems such as demanding conditions, complex preparation methods or processes, or limited output lead to high costs. The development of high-efficiency, low-cost TiC ultrafine powder preparation technology is still the focus of research by scientists and business circles in various countries today.