氧化物共还原制备Mo-10Re预合金粉末及其烧结特性研究  

Study on Mo-10Re Pre-alloyed Powder Prepared by Oxide Co-reduction and Sintering Characteristics

作　　者：曾毅 孙院军[1] 王娜[2] 安耿[2] 孙军[1] ZENG Yi;SUN Yuanjun;WANG Na;AN Geng;SUN Jun(State Key Laboratory for Mechanical Behavior of Materials,Xi'an Jiaotong University,Xi'an 710049,Shaanxi,China;Jinduicheng Molybdenum Co.,Ltd.,Xi'an 710077,Shaanxi,China;Shaanxi Nonferrous Yulin New Materials Group Co.,Ltd.,Yulin 719099,Shaanxi,China)

机构地区：[1]西安交通大学金属材料强度国家重点实验室,陕西西安710049 [2]金堆城钼业股份有限公司,陕西西安710077 [3]陕西有色榆林新材料集团有限责任公司,陕西榆林719099

出　　处：《中国钼业》2023年第4期50-56,共7页China Molybdenum Industry

基　　金：陕西省科技重大专项项目(编号:2020zdzx04-02-01);陕西省2020年创新能力支撑项目(编号:2020kjxx-032)。

摘　　要：分别以MoO_(3)、MoO_(2)为原料与NH_(4)ReO_(4)进行固-固混合,通过两段氢还原制备了Mo-10Re预合金粉末,并将其与传统的Mo-10Re金属粉末混合料进行对比。研究了不同方式制备的Mo-10Re复合粉末形貌、烧结特性及烧结后组织性能差异。结果表明:NH_(4)ReO_(4)在共还原过程中抑制了Mo颗粒长大。采用MoO_(3)为原料共还原制备的粉末一次颗粒<1μm,粉末物相为Mo(Re)固溶体,粉末在1700℃烧结后相对密度达97.4%,比传统混合粉末充分致密化温度低200℃,在3种粉末中表现出最佳的烧结活性与烧结后合金组织均匀性。采用MoO_(2)为原料共还原制备的粉末一次颗粒为1~1.5μm,粉末中除Mo(Re)固溶体相外还存在部分Re、Mo_(33)Re_(67)相,粉末烧结后在大晶粒内部及小晶粒晶界处存在约1~3μm的铼元素聚集颗粒,粉末烧结活性及烧结组织均匀性较MoO_(3)共还原粉末低。采用氧化物共还原预合金粉末制备Mo-10Re合金可以改善金属粉末混料工艺导致的Re元素分布不均、烧结活性低等问题。The MoO_(3) and MoO_(2) powders were used as raw materials for solid-solid mixing with NH_(4)ReO_(4) respectively followed by two-stage hydrogen co-reduction to prepare Mo-10Re pre-alloy powders.As a comparison,Mo-10Re powders prepared by mixture of Mo and Re powders were introduced to study the differences in powder morphology,sintering characteristics,and microstructure after sintered of Mo-10Re composite powders prepared from different ways.The result shows:NH_(4)ReO_(4) inhibits the growth of molybdenμm powder particles during the co-reduction process.The primary particles of the pre-alloyed powder prepared with MoO_(3) as raw material are less than 1μm,and the powder phase is Mo(Re)solid solution.The relative density of the powder after sintering at 1700℃is 97.4%,200℃lower than the full densification temperature of the traditional mixed powder,showing the best sintering activity and structure uniformity after sintering in these three powders.The primary particles of the powder prepared with MoO_(2) as raw material are 1~1.5μm.In addition to the Mo(Re)solid solution phase,there are some Re,Mo_(33)Re_(67) phases in the powder.After sintering,there are about 1~3μm rhenium aggregation particles in the large grain and at the grain boundary of the small grain,which shows a lower sintering activity and sintering structure uniformity than those of MoO_(3) co-reduced powder.The preparation of Mo-10Re alloy using oxide co-reduction pre-alloyed powder can improve the uneven distribution of Re elements and low sintering activity caused by the metal powder mixing process.

关 键 词：共还原 Mo-10Re合金 预合金粉 烧结特性 

分 类 号：TG146.4[一般工业技术—材料科学与工程]