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.
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.
参考文献
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