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利用放电等离子烧结制备原料分别为电弧熔炼粉和单质混合粉的Mo-12Si-8.5B合金。通过优化SPS烧结温度来提高合金的致密度,获得致密的α-Mo+Mo3Si+Mo5SiB2三相合金。采用X射线衍射(XRD)仪和扫描电子显微镜(SEM)对合金的相结构和微观组织进行表征,不同的原料粉末影响合金的三相含量和微观结构。利用单边切口梁法测定不同合金不同温度下的断裂韧性,在SPS烧结温度为1500℃、压力为40MPa和保温时间为5min的工艺条件下,电弧熔炼粉合金和单质混合粉合金的断裂韧性分别为10.7和11.2MPa·m1/2。
Discharge plasma sintering was used to prepare Mo-12Si-8.5B alloy with arc melting powder and elemental powder respectively. By optimizing the SPS sintering temperature to improve the alloy density, to obtain dense α-Mo + Mo3Si + Mo5SiB2 three-phase alloy. The phase structure and microstructure of the alloy were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). Different raw material powders affected the three-phase content and the microstructure of the alloy. The fracture toughness of different alloys at different temperatures were measured by unilateral notched beam method. The fracture toughness of arc melting powder and single-component mixed powder alloy under the conditions of SPS sintering temperature of 1500 ℃, pressure of 40MPa and holding time of 5min respectively 10.7 and 11.2 MPa · m1 / 2.