INFLUENCE OF SYNTHESIS CONDITIONS ON Al(OH)3–Y(OH)3/ZrB2 COMPOSITE PARTICLES

Although Zirconium diboride (ZrB2) is a desirable combination with some good properties, it is easily oxidized in the high-temperature air to impact high-temperature properties, which dwindles the applied range. In order to decrease oxidization and improve the high-temperature properties of ZrB2, the surface of ZrB2 is coated with Al(OH)3–Y(OH)3 to synthesize Al(OH)3–Y(OH)3/ZrB2 composite particles. In this paper, the conditions of synthesizing Al(OH)3–Y(OH)3/ZrB2 composite particles by the co-precipitation method are investigated. Al(OH)3–Y(OH)3/ZrB2 composite particles are synthesized under different conditions, but the conditions of synthesizing Al(OH)3–Y(OH)3/ZrB2 composite particles with the better coating quality require pH = 9, the appropriate concentration (Al3+ = 0.017 mol/L, Y3+ = 0.01 mol/L) of composite solution, reaction time of 60 min, titration speed of 0.05 ml/s, using the dispersant in the ZrB2 suspension and the ultrasonic dispersion, respectively.