多孔TiC陶瓷的制备、性能及机理研究

以TiO2和炭黑为反应物,TiC为添加物,通过反应烧结法制备出多孔TiC陶瓷.研究了TiC的添加量对晶粒大小、孔径尺寸、开气孔率及抗弯强度的影响.研究结果表明:随着TiC的添加量从0;增大到100;,反应生成TiC的粒径从0.17μm增大到0.71μm,孔径尺寸从0.15μm增大到1.51μm,开气孔率从78;持续降到38;,抗弯强度先增加后减小,添加量为80;时最高(86 MPa).TiC生长机理主要是由于添加的TiC使TiO2周围的碳含量减少,从而导致反应生成TiC的熔点降低,扩散能力提高,晶粒粒径增大.

Study on Preparation,Properties and Mechanism of Porous TiC Ceramics

The porous TiC ceramic was prepared by reaction sintering method,using TiO2,carbon black as reactants,TiC as additives.The effects of the addition content of TiC on grain size,pore size,open porosity and bending strength were investigated.The results indicate that with an increase of TiC in range from 0% to 100%,the particle size of TiC formed by reaction increases from 0.17μm to 0.71μm;the pore size enhances from 0.15μm to 1.51μm;the open porosity decreases from 78% to 38%.Additionally the bending strength increases first and then decreases,when addition content is 80%,achieves the highest value of 86 MPa.The growth mechanism of TiC is due to the addition of TiC causing a decrease in the carbon content around TiO2,which leads to a decline in the melting point,an enhancement in diffusion capacity,and an increase in grain size of TiC formed by reaction.