Synthesis and Characterization of WC-6Co Nanocrystalline Composite Powder

IF 0.6 4区 材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY 稀有金属材料与工程 Pub Date : 2018-07-01 DOI:10.1016/S1875-5372(18)30169-3
Guo Shengda , Shen Tao , Bao Rui , Yang Jiangao , Yi Jianhong
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引用次数: 8

Abstract

WC-6Co nanocrystalline composite powders without excess C and decarburization phases were synthesized via a facile route including spraying conversion, calcination and in situ reduction-carbonization processes. The phase constituents obtained by XRD show that the as-prepared powders after each step of the preparation are amorphous, WO3 and Co3O4 phases, WC and Co phases, respectively. Pure WC-Co composite powders could be obtained by a reduction-carbonization process heat treated at 900 °C for 1 h under a hydrogen atmosphere due to the catalytic effect of Co on the carbonation reaction. The effects of heat treatment temperature on phase constituents of powders were investigated in a range of 700∼900 °C. Morphology and microstructure of powders were observed by SEM and HRTEM. The results indicate that the morphology of powder is spherical. The grain size of WC is about 0.36 μm, and the crystalline size of WC is about 56 nm, which indicates that the WC grain is polycrystalline and composed of many crystallites. It is also found that the individual particles of WC are bonded together under the action of Co. Furthermore, a few sintering necks could be observed in the composite powders due to the contacts between WC particles. The stoichiometry of WC-Co composite powders could be adjusted easily. Moreover, the formation process and mechanism of the sphere structure were also discussed in this paper.

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WC-6Co纳米晶复合粉体的合成与表征
采用喷雾转化、煅烧、原位还原碳化等简单工艺制备了无过量碳相和脱碳相的WC-6Co纳米晶复合粉体。XRD相组成分析表明,各步骤制备后的粉体分别为无定形、WO3和Co3O4相、WC和Co相。利用Co对碳化反应的催化作用,采用900℃、氢气气氛下热处理1h的还原-碳化工艺,可制得纯WC-Co复合粉体。在700 ~ 900℃范围内研究了热处理温度对粉末相成分的影响。采用扫描电镜(SEM)和透射电镜(HRTEM)观察粉末的形貌和显微组织。结果表明,粉末形貌呈球形。WC晶粒尺寸约为0.36 μm,晶粒尺寸约为56 nm,表明WC晶粒为多晶,由多晶组成。在Co的作用下,WC的单个颗粒结合在一起,并且由于WC颗粒之间的接触,在复合粉末中可以观察到一些烧结颈。WC-Co复合粉末的化学计量易于调整。并对球结构的形成过程和机理进行了探讨。
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来源期刊
稀有金属材料与工程
稀有金属材料与工程 工程技术-材料科学:综合
CiteScore
1.30
自引率
57.10%
发文量
17973
审稿时长
4.2 months
期刊介绍:
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