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Titanium carbide powder and titanium carbide-ceramics composite powder and method for production thereof, and sintered compact from the titanium carbide powder and sintered compact from the titanium carbide/ceramics composite powders and method for production thereof
Titanium carbide powder and titanium carbide-ceramics composite powder and method for production thereof, and sintered compact from the titanium carbide powder and sintered compact from the titanium carbide/ceramics composite powders and method for production thereof
Disclosed is a highly-pure fine titanium carbide powder having a maximum particle size of 100 nm or less and containing metals except titanium in an amount of 0.05 wt % or less and free carbon in an amount of 0.5 wt % or less. The powder has a NaCl-type crystal structure, and a composition represented by TiCxOyNz, wherein X, Y and Z satisfy the relations: 0.5≦X≦1.0; 0≦Y≦0.3; 0≦Z≦0.2; and 0.5≦X+Y+Z≦1.0.) The powder is produced by: dissolving an organic substance serving as a carbon source in a solvent to prepare a liquid, wherein the organic substance contains at least one OH or COOH group which is a functional group coordinatable to titanium of titanium alkoxide, and no element except C, H, N and O; mixing titanium alkoxide with the liquid to satisfy the following relation: 0.7≦α≦1.0 (wherein α is a molar ratio of the carbon source to the titanium alkoxide), so as to obtain a precursor solution; and subjecting a product in the precursor solution to a heat treatment in a non-oxidizing atmosphere or a vacuum atmosphere at a temperature of 1050 to 1500° C. The present invention can provide fine titanium carbide powders with nano-scale particle sizes, which are free of inorganic impurities, such as titanium oxide and metal, low in free carbon, and effective in enhancing characteristics of a titanium carbide-ceramics composite sintered body.
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机译：公开了一种高纯度细碳化钛粉末，其最大粒径为100nm或更小，并且含有除钛以外的金属，其含量为0.05wt％以下，并且含有游离碳，含量为0.5wt％以下。该粉末具有NaCl型晶体结构，并且由TiCxOyNz表示的组成，其中X，Y和Z满足以下关系：0.5≤X≤1.0;和0≤Y≤0.3; 0≤Z≤0.2; （0.5≤X+ Y +Z≤1.0;和0.5≤X+ Y +Z≤1.0。）通过以下方式制备粉末：将用作碳源的有机物质溶解在溶剂中以制备液体，其中该有机物质包含至少一个OH或COOH基团，其为可与钛醇盐的钛配位的官能团，除C，H，N和O外没有其他元素;将醇钛与液体混合以满足以下关系：0.7≤α≤1.0（其中α是碳源与醇钛的摩尔比），以获得前体溶液。使前体溶液中的产物在非氧化性气氛或真空气氛中于1050至1500℃的温度下进行热处理。本发明可以提供具有纳米级粒度的细碳化钛粉末。不含氧化钛，金属等无机杂质，游离碳低，对提高碳化钛-陶瓷复合烧结体的特性有效。
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