热压烧结固溶复合TiB2-NbB2陶瓷的结构与性能

过渡金属硼化物与TiB₂具有相同的晶体结构和相近的晶格常数,因此通过适当的工艺手段能够与TiB₂形成固溶体.本文以NbB₂作为掺加剂,通过热压烧结制备了TiB₂-NbB₂固溶复合陶瓷.研究了掺加剂含量对烧结材料力学性能的影响,材料的显微结构分别由EPMA、SEM和TEM测定.研究结果表明,NbB₂可以部分固溶到TiB₂中形成固溶体,并有助于细化TiB₂晶粒,同时材料的力学性能得到提高.

Mechanical Properties and Structure of TiB2-NbB2 Composite Prepared by Hot Pressing

Since some transition metal diborides have the same crystal structure of TiB2, they can react with TiB2 to form solid solution composites by adequate technique. In this paper, the TiB2-NbB2 solid solution composite was prepared by hot pressing. The effects of additive content on mechanical properties of composite were investigated. The microstructure analyses were made by EPMA, SEM and TEM. Results show that TiB2 can partly form solid solution with NbB2 and redound to gain uniform grains, which results in the improvement of mechanical properties.