【摘要】 采用盐助燃烧合成工艺制备了纳米碳化锆（ZrC）粉体，研究了原料氧化锆（ZrO₂）粒径对纳米ZrC粉体微观结构的影响规律和作用机制。结果表明，在ZrO₂-Mg-C体系中，随着ZrO₂原始粒径减小（200→10 nm）,碳锆体系反应活性增强，ZrC中的游离碳含量逐渐减少，ZrC粉体的平均粒径随ZrO₂粒径的减小而减小，当加入粒径为10 nm的ZrO₂时，ZrC粉体的平均粒径为48 nm,且类球形形貌更加均匀。原料ZrO₂粒径减小，比表面积增大，提高了反应活性和渗碳速度，从而减小了反应时间、反应温度对晶粒生长的影响，获得了分布均匀的高纯纳米ZrC粉体。更多还原

【Abstract】 Nano ZrC powder was prepared by salt assisted combustion synthesis process. The effect of raw material ZrO₂ particle size on the microstructure of nano ZrC powder and its mechanism were studied. The results show that in ZrO₂-Mg-C system, with the decrease of ZrO₂ original particle size（200→10 nm）, the reaction activity of carbon zirconium system increases and the free carbon content in ZrC decreases gradually. The average particle size of ZrC powder decreases with the decrease of ZrO₂ particle size. When ZrO₂ with particle size of 10 nm is added, the average particle size of ZrC powder is 48 nm, and the spherical like morphology tends to be more uniform. The particle size of raw material ZrO₂ decreases and the specific surface area increases, which improve the reaction activity and carburizing speed, so as to reduce the influences of reaction time and reaction temperature on crystal growth, and obtain high-purity nano ZrC powder with uniform distribution.更多还原