Study on Preparation of Mo–Ni alloy with spark plasma sintering
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摘要: 本文采用放电等离子烧结方法制备钼镍合金，研究了烧结温度、压强、保温时间、升温速率对钼镍合金相对密度的影响。通过SEM、XRD、EBSD等检测手段对钼镍合金的相对密度、显微形貌、物相等进行表征。分析了放电等离子烧结钼镍合金的致密化过程。结果表明：烧结温度、压强是影响钼镍合金相对密度的主要因素；最大相对密度达99.10%，平均晶粒尺寸小于10 μm；Mo、Ni两种元素的局部高速扩散是促进钼镍合金致密化的主要原因；烧结态钼镍合金的物相主要由Mo和MoNi中间相组成，Mo颗粒均匀分布在MoNi中间相形成的网状组织中；平均硬度值HRA为72；添加剂Ni%的含量在烧结前后变化不大。
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关键词:
Abstract: Mo-Ni alloy was prepared by spark plasma sintering. The effects of sintering temperature, pressure, holding time and heating rate on the relative density of Mo-Ni alloy were studied. The relative density, microstructure and phase of Mo-Ni alloy were characterized by SEM, XRD and EBSD. The densification process of Mo-Ni alloy sintered by spark plasma was analyzed.The results show that, Sintering temperature and pressure are the main factors affecting the relative density of Mo-Ni alloy; The maximum relative density is 99.10%, and the average grain size is less than 10μm;The local high-speed diffusion of Mo and Ni is the main reason for promoting the densification of Mo-Ni alloy;The phase of sintered Mo-Ni alloy is mainly composed of Mo and Mo-Ni mesophase,and Mo particles are evenly distributed in the network structure formed by Mo-Ni mesophase;The average rockwell hardness value is 72.The content of additive Ni% does not change much before and after sintering.-
Key words:
- spark plasma sintering /
- Mo–Ni alloys /
- densification
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