Mo-Si-B三元系中T2相合金的制备工艺研究
STUDY ON THE PREPARATION PROCESS OF T2 ALLOY IN THE Mo-Si-B SYSTEM
潘昆明 1张来启 2魏世忠 1李继文 1李豪 3林均品2
作者信息
- 1. 河南科技大学摩擦学与材料防护教育部工程研究中心,洛阳471023
- 2. 北京科技大学新金属材料国家重点实验室,北京100083
- 3. 洛阳理工学院材料科学与工程学院,洛阳471023
- 折叠
摘要
分别通过还原气氛常压烧结法(TFS)和放电等离子烧结法(SPS)制备Mo5SiB2(T2)相合金,并采用XRD,SEM和TEM等方法对合金的微观结构进行表征.结果表明:快的升温速率是合成T2相的动力学条件,相比传统烧结方式,SPS法以独特的等离子活化烧结方式提供快的加热速率,能够在较短的时间内升温到所需温度1500℃,避免Mo,Si和B混合粉末在中温区间(600～1200℃)通过固-固反应生成Mo3Si,Mo5Si3和MoB等二元相,而通过固-液反应原位合成T2相.合金平均晶粒尺寸为1.44 μm,晶界清晰、洁净、无过渡区且在晶体内没有观察到位错等缺陷.
Abstract
Mo5SiB2 (T2) can be used as a promising elevated-temperature structural material because of its high melting temperature (about 2200 ℃),and excellent resistance to oxidation and creep.The Mo5SiB2 (T2) alloy was prepared by both spark plasma sintering (SPS) and tube furnace sintering (TFS),and then the microstructures were characterized by XRD,SEM-EDS and TEM.The results show that the rapid heating rate is one of important dynamic conditions responsible for the synthesis of T2.Compared with traditional methods,SPS can provide the fast synthesis in a particular way of labilized plasma sintering so that the sample can be heated to the expected temperature of 1500 ℃ with a short period.The melted Si can rapidly react with Mo and B to synthesize T2 in the solid-liquid state prior to the formation of binary phases (Mo3Si,Mo5Si3,MoB,etc.) in the solid state in the range of 600～1200 ℃.The average size of grains is equal to 1.44 μm.The boundaries are clear and have the shape of a straight line without transition zones.Moreover,no defects such as dislocations were found in the T2 alloys prepared by SPS.
关键词
Mo5SiB2(T2)/常压烧结(TFS)/放电等离子烧结(SPS)/微观组织Key words
Mo5SiB2 (T2)/tube furnace sintering (TFS)/spark plasma sintering (SPS)/microstructure引用本文复制引用
基金项目
国家自然科学基金(50871012)
国家自然科学基金(U1504514)
长江学者和创新团队发展计划项目(IRT1234)
河南省科技攻关项目(20140401)
出版年
2015
NETL
NSTL
维普
万方数据