用X射线衍射仪、扫描电镜、万能材料试验机研究了真空液相烧结制备的Mo2FeB2金属陶瓷热处理后的组织与性能.结果表明,真空液相烧结Mo2FeB2金属陶瓷主要由Mo2FeB2、MoB2、Fe2B相和铁基粘结相组成,经700～1000℃热处理后,MoB2、Fe2B相逐渐转化为Mo2FeB2相,并且Mo2FeB2晶粒细化,呈规则块状均匀分布在铁基粘结相中.Mo2FeB2金属陶瓷在700～1000℃范围内随热处理温度的升高,弯曲强度、断裂韧性与维氏硬度均增加,当热处理温度为1000℃时,其值分别达到1182.42MPa、13.59 MPa·m1/2、9.114 GPa,与未处理试样相比,分别增加了5.4%、6.0%、7.0%.
Microstructure and properties of Mo2FeB2 cermet after heat treatment were investigated by means of X-ray diffraction(XRD),scanning electron microscopy(SEM)and bending,fracture toughness and hardness tests.The results show that the microstructure of Mo2FeB2 cermet consists of Mo2FeB2,MoB2,Fe2B and iron based binding phases.After heat treatment at 700-1000 ℃,MoB2 and Fe2B are transformed into the phase of Mo2FeB2,and the grains of Mo,FeB2 are refined ant it is homogeneously distributed in the iron based binding phase with regular block-shape.The bending strength,fracture toughness and vickers hardness of the cermet increase with increasing heat treatment temperature in the range of 700-1000℃,and the values of those reach 1182.42 MPa,13.59 MPa·m1/2 and 9.114 GPa,respectively,and increase by 5.4%,6.0% and 7.0% as compared with that of un-treated specimens for Mo2FeO2 cermet heat-treated at 1 000℃.
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