郭圣达,沈韬,鲍瑞,羊建高,易健宏.纳米晶WC-6Co复合粉合成及特性研究[J].稀有金属材料与工程,2018,47(7):1986~1992.[guoshengda,shen tao,bao rui,yang jiangao,Yi Jianhong.Synthesis and Characterization of WC-6Co Nanocrystalline Composite Powder[J].Rare Metal Materials and Engineering,2018,47(7):1986~1992.]
纳米晶WC-6Co复合粉合成及特性研究
投稿时间:2016-12-28  修订日期:2017-03-17
中文关键词:  WC-6Co复合粉  相组成  低温合成  多晶体
基金项目:
中文摘要:
      使用喷雾转化、煅烧和原位还原碳化技术制备了纳米晶WC-6Co复合粉末。通过XRD研究相组成发现,经过喷雾转化处理后粉末为定形相、经煅烧后的粉末为WO3与Co3O4相、经还原碳化工艺后的物相是WC与Co相;由于Co对碳化过程的催化作用,将煅烧后的粉末置于氢气气氛中加热至900度还原碳化1个小时,即可将粉末碳化完全,制备出WC与Co相共存的纯净复合粉。文章还研究了还原碳化温度(700-900 ℃)对粉末相组成的影响,并通过SEM和HRTEM观察粉末形貌与微观组织。结果表明:制备的粉末具有球形结构,WC晶粒约0.36 μm,亚晶尺寸约为56 nm,说明WC晶粒是多晶体。同时发现粉末中的WC单颗粒被Co相互粘结在一起,且在WC与WC颗粒的接触部位发现存在烧结颈。文章还讨论了复合粉球形结构的形成过程和机理。
Synthesis and Characterization of WC-6Co Nanocrystalline Composite Powder
英文关键词:WC-6Co composite powder  Phase constituents  Low-temperature synthesis  Polycrystal
英文摘要:
      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 showed that the as-prepared powders after each step of the preparation were amorphous, WO3 and Co3O4 phases, WC and Co phases, respectively. The 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 treated 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 indicated that the morphology of powder was spherical. The grain size of WC was about 0.36 μm, and the crystalline size of WC was about 56 nm, which indicated that the WC grain was polycrystalline and comprised of many crystallites. It was also found that the individual particles of WC were 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 are also discussed in this paper.
作者单位E-mail
郭圣达 昆明理工大学 材料科学与工程学院 enga@163.com 
沈韬 昆明理工大学 材料科学与工程学院  
鲍瑞 昆明理工大学 材料科学与工程学院  
羊建高 江西理工大学 工程研究院  
易健宏 昆明理工大学 材料科学与工程学院  
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