纳米碳化钨粉的制备和晶粒粗化动力学研究

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.

Preparation and Coarsening Characteristics of Grain Size in Nanocrystalline Tungsten Carbide Powder

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.