(1. 合肥工业大学 材料科学与工程学院，合肥 230009；
2. 安徽省粉末冶金工程技术研究中心，合肥 230009)
摘 要: 以Mo、AlN以及TiO2粉末为原料，添加适当的烧结助剂，制备出成形混合料，通过模压成形和烧结分别得到了不同Mo含量的Mo/AlN和Mo/TiO2金属陶瓷烧结体。采用X射线衍射仪、扫描电镜、万能材料试验机和矢量网络分析仪等对烧结体的相组成、显微组织、力学性能和微波吸收性能等进行测试分析。结果表明：Mo/AlN和Mo/TiO2成形压坯分别在1 750 ℃和1 350 ℃下烧结4 h，可以获得相对密度分别高于97%和94%的Mo/AlN和Mo/TiO2金属陶瓷。Mo/AlN金属陶瓷的力学性能随Mo含量的增加而提高，而Mo/TiO2金属陶瓷的力学性能随Mo含量的增加先升高后降低。Mo的加入明显改善AlN和TiO2陶瓷的微波吸收性能，含40%Mo(质量分数)的Mo/AlN和Mo/TiO2试样在14~18 GHz频率范围最大反射衰减量分别达到22 dB和19 dB。
关键字: Mo/AlN；Mo/TiO2；金属陶瓷；显微组织；力学性能；微波吸收性能
Mo-contained microwave-absorbing cermets
（1. School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, China;
2. Powder Metallurgy Engineering and Technology Research Center of Anhui Province, Hefei 230009, China）
Abstract:Mo/AlN and Mo/TiO2 cermets were manufactured by a conventional pressing-sintering process using Mo, AlN and TiO2 as raw materials. The phase composition, microstructure, mechanical and microwave-absorbing properties of the sintered cermets were characterized by XRD, SEM, universal testing machine and network analyzer，respectively. The results show that Mo/AlN and Mo/TiO2 cermets with relative density of more than 97% and 94% can be obtained by sintering their compacts at 1 750 ℃ and 1 350 ℃ for 4 h, respectively. While the mechanical properties of the Mo/AlN cermets increase with Mo contents increasing, the mechanical properties of the Mo/TiO2 cermets first increase and then decrease with Mo content increasing. Mo addition improves the microwave-absorbing behaviors of AlN and TiO2 ceramics. Mo/AlN and Mo/TiO2 samples with 40% Mo (mass fraction) show a maximum reflection loss of 22 dB and 19 dB, respectively, in the frequency range of 14−18 GHz.
Key words: Mo/AlN; Mo/TiO2; cermets; microstructure; mechanical property; microwave-absorbing property
