(1. 合肥工業(yè)大學 材料科學與工程學院，合肥 230009；
2. 安徽省粉末冶金工程技術(shù)研究中心，合肥 230009)
摘 要: 以Mo、AlN以及TiO2粉末為原料，添加適當?shù)臒Y(jié)助劑，制備出成形混合料，通過模壓成形和燒結(jié)分別得到了不同Mo含量的Mo/AlN和Mo/TiO2金屬陶瓷燒結(jié)體。采用X射線衍射儀、掃描電鏡、萬能材料試驗機和矢量網(wǎng)絡(luò)分析儀等對燒結(jié)體的相組成、顯微組織、力學性能和微波吸收性能等進行測試分析。結(jié)果表明：Mo/AlN和Mo/TiO2成形壓坯分別在1 750 ℃和1 350 ℃下燒結(jié)4 h，可以獲得相對密度分別高于97%和94%的Mo/AlN和Mo/TiO2金屬陶瓷。Mo/AlN金屬陶瓷的力學性能隨Mo含量的增加而提高，而Mo/TiO2金屬陶瓷的力學性能隨Mo含量的增加先升高后降低。Mo的加入明顯改善AlN和TiO2陶瓷的微波吸收性能，含40%Mo(質(zhì)量分數(shù))的Mo/AlN和Mo/TiO2試樣在14~18 GHz頻率范圍最大反射衰減量分別達到22 dB和19 dB。
關(guān)鍵字: Mo/AlN；Mo/TiO2；金屬陶瓷；顯微組織；力學性能；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
