Preparation method of titanium carbide/titanium diboride composite ceramic particle preform: Fid-Bau Portal

Preparation method of titanium carbide/titanium diboride composite ceramic particle preform

YANG HUIZHI

The invention relates to a preparation method of a titanium carbide/titanium diboride composite ceramic particle preform. The preparation method comprises the following steps: firstly, preparing titanium carbide/titanium diboride composite ceramic particles; and then preparing a titanium carbide/titanium diboride composite ceramic particle preform. The titanium carbide/titanium diboride composite ceramic particles can be prepared by a pressure granulation method or a sol-gel granulation method. According to the pressure granulation method, titanium carbide and titanium diboride are utilized to form an eutectic phase with a low sintering temperature, then a small amount of metal sintering aid is added, and pressureless sintering can be carried out at the low sintering temperature to form the titanium carbide/titanium diboride composite ceramic particles. The sol-gel method granulation comprises the following steps: adding water, a water reducing agent and a sodium alginate solution into mixed powder formed by titanium carbide powder, titanium diboride powder and metal powder, carrying out ball milling, curing and carrying out high-temperature sintering. The obtained composite ceramic particles have high hardness and high toughness, and compared with zirconium oxide toughened aluminum oxide ceramic particles, the performance of the metal-based ceramic particle composite material can be further improved.

本发明涉及一种碳化钛/二硼化钛复合陶瓷颗粒预制体的制备方法，先制备碳化钛/二硼化钛复合陶瓷颗粒；再制备碳化钛/二硼化钛复合陶瓷颗粒预制体。所述碳化钛/二硼化钛复合陶瓷颗粒可以通过压力造粒法或者溶胶凝胶造粒法制备。压力造粒法是利用碳化钛和二硼化钛形成烧结温度较低的共晶相，再添加少量金属助烧剂，可在较低的烧结温度下进行无压烧结形成碳化钛/二硼化钛复合陶瓷颗粒。溶胶凝胶法造粒是将碳化钛粉、二硼化钛粉、金属粉形成的混合粉体添加水和减水剂及海藻酸钠溶液，球磨后固化并经高温烧结制备。所得复合陶瓷颗粒具有高硬度和高韧性，与氧化锆增韧氧化铝陶磁颗粒相比，可进一步提高金属基陶瓷颗粒复合材料的性能。

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