Zirconium nitride microspheres with uniform size of ~680 μm, good sphericity, and good integrity were prepared by internal gelation process and two-step nitridation. The effects of carbon black and temperature on stability of sol were investigated. Induction of carbon black decreased stability of sol but the amount of carbon black added has little effect on the sol stability. Increasing temperature linearly decreased the stable time of the sol. Sol with stable time of up to 1 h, which was adequate for casting of liquid spheres was achieved at 11.0 °C, a significant increase from conventional 4.0 °C. Two-step nitridation was developed to prepare crack-free ceramic microspheres with high relative nitride phase content. The special microstructure on surface and cross section of microspheres reveals stepped-growth of nitride crystals.

通过内部凝胶化工艺和两步氮化法制备了尺寸均匀，约680μm，球形度好，完整性好的氮化锆微球。研究了炭黑和温度对溶胶稳定性的影响。炭黑的诱导降低了溶胶的稳定性，但是炭黑的添加量对溶胶的稳定性影响很小。温度的升高线性地降低了溶胶的稳定时间。在11.0°C的温度下，溶胶的稳定时间长达1小时，足以浇铸液球，比传统的4.0°C有了显着提高。开发了两步氮化工艺，以制备具有较高相对氮化物相含量的无裂纹陶瓷微球。微球表面和横截面的特殊微观结构揭示了氮化物晶体的逐步生长。