亚微和超细碳化钨粉末的质量缺陷与粒度表征  

Quality Defect and Particle Size Characterization of Submicron and Ultrafine Tungsten Carbide Powders

作　　者：付胜 张立[2] 陈焕涛 戴湘平 FU Sheng;ZHANG Li;CHEN Huantao;DAI Xiangping(Guangdong Xianglu Tungsten Co.,Ltd.,Chaozhou 515633,Guangdong,China;State Key Laboratory of Powder Metallurgy,Central South University,Changsha 410083,Hunan,China)

机构地区：[1]广东翔鹭钨业股份有限公司,广东潮州515633 [2]中南大学粉末冶金国家重点实验室,湖南长沙410083

出　　处：《中国钨业》2020年第6期1-7,29,共8页China Tungsten Industry

基　　金：湖南省自然科学基金资助项目(2019JJ40373);中国工程院咨询研究项目(2019-XZ-9)

摘　　要：亚微、超细和纳米碳化钨粉末的质量缺陷是影响亚微和超细晶硬质合金质量稳定性的关键要素。研究采用X射线衍射物相分析和扫描电镜微观特征分析方法,对亚微和超细碳化钨粉末的质量缺陷进行直接表征与分析,除硬团聚颗粒和未碳化完全所导致的W2C物相等常规缺陷外,发现了H2WO4·H2O杂相以及与O、N具有高反应活性的大尺寸游离碳和碳化钨镶嵌结构,分析了上述缺陷与亚微和超细晶硬质合金微观结构缺陷的关系,提出了亚微和超细晶硬质合金及其碳化钨原料粉末质量控制的建议,讨论了亚微和超细碳化钨粉末粒度表征方法的适宜性。The quality defects of submicron,ultrafine and nanotungsten carbide powders are the key factors affecting the quality stability of submicron and ultrafine cemented carbides.The paper uses X-ray diffraction phase analysis and scanning electron microscopy micro-feature analysis methods to directly characterize and analyze the quality defects of submicron and ultrafine tungsten carbide powder.In addition to the conventional defects of W2C content caused by hard agglomerated particles and complete uncarbonization,H2WO4·H2O heterophase and large-size free carbon and tungsten carbide mosaic structures with high reactivity with oxygen and nitrogen have been discovered.By analyzing the relationship between the above defects and the microstructure defects of submicron and ultrafinegrained cemented carbide,some suggestions on quality control of submicron and ultrafinegrained cemented carbide and tungsten carbide raw material powder are put forward.Then,the suitability of particle size characterization methods of submicron and ultrafine tungsten carbide powder is discussed.

关 键 词：碳化钨粉末 质量缺陷 物相分析 微观分析 粒度表征 超细晶硬质合金 质量控制 

分 类 号：TF122[冶金工程—粉末冶金] TG115.213.1[冶金工程—冶金物理化学]