放电等离子烧结制备钼镍合金  

Preparation of Mo–Ni alloys by spark plasma sintering

作　　者：王娜[1] 武洲[1] 朱琦[1] 席莎[1] 张晓[1] 周莎 李晶[1] 王宇晴 WANG Na;WU Zhou;ZHU Qi;XI Sha;ZHANG Xiao;ZHOU Sha;LI Jing;WANG Yuqing(Jinduicheng Molybdenum Co.,Ltd.,Xi’an 710077,China)

机构地区：[1]金堆城钼业股份有限公司,西安710077

出　　处：《粉末冶金技术》2024年第4期361-366,共6页Powder Metallurgy Technology

基　　金：陕西省重点研发计划资助项目(2020ZDLGY12-07)。

摘　　要：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。通过扫描电子显微镜、X射线衍射仪、电子背向散射衍射仪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:烧结温度和压强是影响钼镍合金相对密度的主要因素,Mo和Ni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。烧结态钼镍合金最大相对密度99.10%,平均晶粒尺寸小于10μm,平均硬度HRA 72。添加剂Ni含量在烧结前后变化不大。Mo-Ni alloys were prepared by spark plasma sintering.The effects of sintering temperature,pressure,holding time,and heating rate on the relative density of Mo-Ni alloys were studied.The relative density,microstructure,and phase composition of Mo-Ni alloys were characterized by scanning electron microscope,X-ray diffraction,and electron back-scattered diffraction.The densification process of Mo-Ni alloys by spark plasma sintering was analyzed.The results show that,the sintering temperature and pressure are the main factors affecting the relative density of Mo-Ni alloys,the local high-speed diffusion of Mo and Ni is the main reason for promoting the densification of Mo-Ni alloys.The phases of sintered Mo-Ni alloys are mainly composed of Mo and Mo-Ni mesophases,and the Mo particles are evenly distributed in the network structure formed by Mo-Ni mesophases.The maximum relative density is 99.10%,the average grain size is less than 10μm,and the average rockwell hardness value is HRA 72.The content of additive Ni does not change much before and after sintering.

关 键 词：放电等离子烧结 钼镍合金 相对密度 物相组成 致密化 

分 类 号：TF124[冶金工程—粉末冶金] TG146.4[冶金工程—冶金物理化学]