Preparation method of Ti3AlC2 ceramic powder

Abstract

The invention discloses a preparation method of a Ti3AlC2 ceramic powder, and belongs to the technical field of material science. The preparation method includes the following steps: taking Ti, Al and TiC respectively according to a molar ratio of Ti:Al:TiC:Sn:Si equal to 1:(1-1.3): 2:(0.05-0.2):(0.05-0.15), then adding a Sn powder and a Si powder and mixing well to obtain a mixture; 2) adding ethanol, conducting fully ball milling to obtain a uniform powder and drying; and 3) sintering the dried mixture in vacuum and cooling to obtain the Ti3AlC2 ceramic powder. The simple process provided by the invention is simple; addition of a grinding aids improves mixing uniformity of the mixture; addition of synthetic additives improves the purity of the product and reduces the impurities; and using TiC powder as a C source not only reduces the synthesis temperature but also improves the purity of the product.

Description

technical field [0001] The invention belongs to the technical field of material science, in particular to a Ti 3 AlC 2 Preparation method of ceramic powder. Background technique [0002] Ti 3 AlC 2 Both the excellent characteristics of metal and ceramics, such as low density (4.2g / cm 3 ), low hardness (Hv is 3.5GPa), good electrical and thermal conductivity, thermal shock resistance, friction resistance, cutting processing, high temperature and plasticity, etc. It can be used to manufacture high temperature engines, a new generation of brushes and electrodes, and is also suitable for Stirrer bearings for chemical reaction kettles, fan bearings for atmosphere heat treatment furnaces, and special mechanical seals. due to Ti 3 AlC 2 Ceramics can also absorb mechanical shocks, and still maintain the characteristics of hardness and lightness. They can be used in the manufacture of automotive and aircraft engine components, as well as the production of precision mechanical ...

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Problems solved by technology

[0004] Ai MX et al. found that by mixing Ti powder, Al powder and graphite powder, and adding an appropriate amount of Sn powder, pure Ti can be calcined. 3 AlC 2 Powder, the calcination temperature is 1300-1500℃, adding Sn powder can not only suppress thermal explosion, but also reduce the calcination temperature to promote single-phase Ti 3 AlC 2 The synthesis of , the molar ratio of 3Ti:1Al:1.8C:0.2Sn mixture can be calcined at 1350-1500 ℃ to obtain pure powder (Ai M X, Zhai H X, Zhou Y et al.J Am Ceram Soc[J] , 2006,89:1114), but the results show that the material obtained by this method has more impurities and is not high in purity; Liang, BY et al. studied the addition of Sn powder in the Ti-Al-C system to synthesize Ti by mechanical activation sintering 3 AlC 2 powder (Liang, BY; Wang, MZ et al.B MATER SCI, 2010,33(4):401-406), but this method is not only difficult to synthesize high-purity Ti 3 AlC 2 powder, and the preparation efficiency is low, and the cost is high; Mei Bingchu et al. found that using Si as an auxiliary agent to prepare single-phase dense Ti 3 AlC 2 A method for bulk materials, using TiC powder, Ti powder, Si powder and Al powder as raw materials, the molar number of Si powder is 0.15-0.25, the heating rate is 20-60°C / min, and Ar gas is used as the protective atmosphere. Sintering in a hot press furnace to form a block (Zhu Jiaoqun, Mei Bingchu, Xu Xuewen, Liu Jun, CN03128183.4[P], 2003-12-10), but the sintering atmosphere of this method is not conducive to high-purity Ti 3 AlC 2 Synthesis, and too high synthesis rate can not fully react the mixture, the method has low yield and takes a long time

In addition, the above-mentioned methods all have certain impurity phases to varying degrees, and the purity of the material needs to be further improved.

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