Mechanism of Synthesizing Al(OH)₃‐Y(OH)₃‐ZrB₂ Composite Particles

Abstract

Abstract To decrease the oxidation and improve the strength of ZrB2 at high temperatures, the surface of ZrB2 is coated with Al(OH)3 and Y(OH)3, which results in the production of Al(OH)3‐Y(OH)3‐ZrB2 composite particles. The pH value through analysis of theory and calculation must be greater than 8.3 provided that Al(NO3)3 and Y(NO3)3 both reached the saturated concentration of heterogeneous nucleation or homogeneous nucleation to co‐precipitation of Y3+ and Al3+ precursors on the surface of ZrB2 particles. When pH is 9, Al(OH)3‐Y(OH)3‐ZrB2 composite particles are synthesized successfully and the best coating quality with Al(OH)3 and Y(OH)3 by co‐precipitation method, which established the foundation for preparing high‐performance YAG/ZrB2 and Al2O3‐YAG/ZrB2 multiphase ceramic materials. Keywords: zirconium diboridecomposite particlesmechanismco‐precipitation methodssynthesis Acknowledgments This work is supported by the National Natural Science Foundation of China (Grant No.50232020).