烧结温度对制备多孔TiB_2-TiC复相陶瓷性能的影响

Effect of sintering temperature on properties of porous TiB_2-TiC multiphase ceramics

为了获得孔隙度为(30±5)%TiB2-TiC复相陶瓷,采用反应烧结法,在不同温度下进行真空烧结制备出多孔TiB2-TiC复相陶瓷。主要研究了烧结温度对样品的密度、透气性和力学性能的影响,并对反应过程中样品的相组成进行了分析。试验结果表明:反应过程于1 000℃开始,于1 300℃结束;反应过程中存在TiB、Ti3B4中间相,反应完成后最终产物只有TiB2和TiC两相。随着烧结温度的升高,样品的密度和抗弯强度均是逐渐增大的,最大孔径和相对透气系数则是逐步降低的。于1 700℃烧结制备出的复相陶瓷的密度为3.2g/cm3、开孔隙度为29.5%、抗弯强度达到了120MPa,达到了预期目标。

In order to attain porous TiB2-TiC muhiphase ceramics, reactive sintering was carried out at different temperature to study the effect of temperature on the density, air permeability and mechanical properties of porous TiB2-TiC muhiphase ceramics. XRD was used to analysis phases composition of the sinters. The result indicates that TiB2 and TiC are the final products when reaction finishs at 1 300℃. With the rising of sintering temperature, the density and transverse rupture strength of all the specimens increase all the while, maximum aperture and the gas permeability decrease gradually. The porous TiB2-TiC muhiphase ceramics were prepared by sintering at 1 700℃ for 1 h and its density, open porosity and transverse rupture strength at room temperature are 3.2g/cm^3 ,29.5 % , 120MPa, respectively.