用工业化生产设备制备纳米碳化钨粉,采用XRD、BET、SEM、FESEM、TEM对样品的物相、粒度及其分布进行了表征,研究了不同退火温度和不同退火保温时间对晶粒大小的影响.实验结果表明,纳米碳化钨粉粒度为90nm左右时大多数近似球形.对纳米WC晶粒长大机理进行了研究,发现温度是影响纳米WC晶粒长大的一个重要因素,随着退火温度的升高,纳米WC晶粒尺寸增大,而且纳米WC晶粒粗化符合经典的LSW理论.
Nanocrystalline tungsten carbide(nano-WC) powder is prepared on the basis of the industrialized production equipment. Methods of X-ray diffraction, specific surface area, SEM, FESEM and TEM are applied to test the phase,particle size and its distribution of nano-WC powder. The results indicate the average particle size of nanoWC is about 90nm and most of the particles are spherical shape. Nano-WC powder is annealed at different temperatures for different time. The grain coarsening mechanism is studied and proved to be according with the classic LSW theory.Furthermore,temperature is an important factor to affect the grain growth of nano-WC and the grain size increases with the high temperature.
参考文献
| [1] | Jia K;Fischer T E;Gallois B .Microstructure hardness and toughness of nanostructured and conventionnal WC-Co composites[J].Nano-Structured Materials,1998,10(05):875. |
| [2] | Jianfei Sun;Faming Zhang;Jun Shen .Characterizations of ball-milled nanocrystalline WC-Co composite powders and subsequently rapid hot pressing sintered cermets[J].Materials Letters,2003(21):3140-3148. |
| [3] | Cha SI.;Hong SH.;Kim BK. .Spark plasma sintering behavior of nanocrystalline WC-10Co cemented carbide powders[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2003(1/2):31-38. |
| [4] | Breval E;Cheng JP;Agrawal DK;Gigl P;Dennis A;Roy R;Papworth AJ .Comparison between microwave and conventional sintering of WC/Co composites[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2005(1/2):285-295. |
| [5] | Z. FANG;J. W. EASON .Study of Nanostructured WC-Co Composites[J].International Journal of Refractory Metals & Hard Materials,1995(5):297-303. |
| [6] | 李继刚,吴希俊,谭洪波,刘金芳.纳米碳化钨粉的制备及其热稳定性研究[J].稀有金属材料与工程,2004(07):736-739. |
| [7] | 单妍,王昕,于薛刚,徐静,尹衍升,崔学民.Al2O3-ZrO2陶瓷体系中晶粒生长模型的研究[J].硅酸盐学报,2003(03):278-282. |
| [8] | 王洪涛,王旭,余永宁.纳米WC/Co硬质合金粉末烧结早期的晶粒长大研究[J].稀有金属与硬质合金,2005(01):18-21. |
| [9] | Yoon BK;Lee BA;Kang SJL .Growth behavior of rounded (Ti,W)C and faceted WC grains in a Co matrix during liquid phase sintering[J].Acta materialia,2005(17):4677-4685. |
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