前驱体法制备B_4C-TiB_2复相陶瓷及其性能研究

STUDY ON THE PROPERTIES OF B_4C-TiB_2 COMPOSITES PREPARED BY PRECURSOR METHOD

以B_4C粉、钛酸四丁酯为主要原料,通过烧结过程中的原位反应,在2100℃热压烧结制备了B_4C- TiB_2复相陶瓷。分别采用XRD和SEM分析了其物相组成和显微结构,并测试了其致密度和力学性能。结果表明,在B_4C基体中生成了弥散分布的超细TiB_2颗粒,TiB_2的引入使样品的致密度提高。添加2vol%TiB_2的样品的硬度、抗弯强度、弹性模量和断裂韧性分别达到了31GPa、586.6MPa、408.7GPa和7.61 MPa·m^(1/2),比相同条件下制备的碳化硼单相陶瓷均有提高。

B4C-TiB2 composites were prepared by hot-pressing at 2100℃ with B4C powder and tetrabutyl titanate as main materials. The phase and microstructure of the composites were analyzed by XPD and SEM. The density and mechanical properties were tested. The results showed that TiB2 particles were gained successfully in the B4C matrix, and the addition of TiB2 particles promoted the relative densities of the samples. The Vickers hardness, flexural strength , elastic modulus and toughness of the sample B4C-2vol%TiB2 reached 31GPa, 586.6MPa, 408.7GPa and 7.61MPa. m^1/2 respectively. It＇ s obvious that all the parameters overmatch the monolithic B4C sample.