喷雾干燥结合等离子球化法制备NbMoTaWZr-HfC粉末的特性与组织演变研究  

Characteristics and Microstructure Evolution of Spherical NbMoTaWZr-HfC Powders Fabricated by Spray Granulation Combined with Plasma Spheroidization

作　　者：顾涛 汪礼敏 胡强 梁秀兵 付东兴[2] 陈永雄 赵新明 盛艳伟 Gu Tao;Wang Limin;Hu Qiang;Liang Xiubing;Fu Dongxing;Chen Yongxiong;Zhao Xinming;Sheng Yanwei(GRIPM Advanced Materials Co.,Ltd,Beijing 100088,China;General Research Institute for Nonferrous Metals,Beijing 100088,China;National Innovation Institute of Defense Technology,Academy of Military Science PLA China,Beijing 100071,China;GRINM Additive Manufacturing Technology Co.,Ltd,Beijing 101407,China)

机构地区：[1]有研粉末新材料股份有限公司,北京100088 [2]北京有色金属研究总院,北京100088 [3]军事科学院国防科技创新研究院,北京100071 [4]有研增材技术有限公司,北京101407

出　　处：《稀有金属材料与工程》2023年第6期2161-2168,共8页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(51975582);国家重点研究开发项目(2018YFC1902400);北京市博士后基金;山西省基础研究计划(202103021224215)。

摘　　要：采用喷雾干燥+射频等离子体球化法制备NbMoTaWZr-HfC球形粉末,并对粉末的宏观特性、物相组成和微观组织形貌进行研究和分析。结果表明,制备的复合粉末形状为球形,粒度范围为13.31~32.11μm,D_(50)=19.62μm。粉末球形度、流速和松装密度分别为0.98、0.198 s/g,7.20 g/cm^(3)。球化后粉末由体心立方(bcc)固溶体+ZrO_(2)+HfC物相组成,其内部组织为枝晶和胞状晶混合组织。球化后粉末颗粒整体成分均匀,但在枝晶微区存在元素偏析,其中W、Mo、Ta等高熔点元素在枝晶臂富集,Nb、Zr等低熔点元素在枝晶间富集,而Hf元素分布均匀。NbMoTaWZr-HfC spherical powder was fabricated by spray granulation combined with radio frequency plasma spheroidization.The macroscopic characteristics,phase composition and microstructure of the powder are studied.The results reveal that the composite powder is spherical and the particle size ranges from 13.31μm to 32.11μm with D_(50)=19.62μm.The sphericity,flow rate and bulk density of the spheroidized powder are 0.98,0.198 s/g,7.20 g/cm^(3).Moreover,the main phases of NbMoTaWZr-HfC spherical powder are body-centered-cubic(bcc)solid solution+ZrO_(2)+HfC phase and it has dendritic and cellular structure.The element distribution in the spherical NbMoTaWZr-HfC powder is uniform.However elemental segregation occurs in the dendritic scale region;high melting point elements such as W,Mo,and Ta are enriched in the dendrite arm,low melting point elements such as Nb and Zr are enriched at the interdendritic region,and the Hf are uniformly distributed.

关 键 词：喷雾干燥 等离子球化 球形粉末 NbMoTaWZr-HfC复合材料 

分 类 号：TF123.74[冶金工程—粉末冶金]