Mo-Si材料相组成与热膨胀性能的研究

Phase Composition and Coefficient of Thermal Expansion of Mo-Si Composites Prepared by Liquid Reactive Sintering

利用液相反应烧结制备不同配比的Mo-S i复合材料,用X射线分析相组成,扫描电镜观察微观组织形貌,热膨胀仪测不同块体材料的热膨胀系数(CTE)。研究结果表明,不同配比烧结体相组成以MoS i2为主,当S i/Mo为2.2∶1(at%)时MoS i2基体中仍含有极少量的Mo5S i3相,而S i/Mo为2.3∶1时生成纯MoS i2。复合材料的CTE随Mo5S i3相含量的减少而增加,当S i/Mo达到2.3∶1时,CTE为最大值(8.16×10-6K-1)。

The composites of different Mo/Si ratio were prepared by vacuum liquid reactive sintering.The phase composition and microstructure of composites was analyzed by XRD and SEM,respectively.Their coefficients of thermal expansion(CTE) were measured by thermal dilatometer.MoSi_2 was primary phase in the composites.There was a little Mo_5Si_3 phase in the composite when Si/Mo ratio was 2.2∶1.With Si/Mo ratio increase to 2.3∶1 Mo_5Si_3 phase disappeared.The CTE increased with content of Mo_5Si_3 phase decreasing a...