Effect of Conditions on the Dispersibility of ZrB₂ Particles

ZrB₂@A1(OH)₃‐Y(OH)₃ core‐shell composite particles are synthesized by co‐precipitation method for strengthening the antioxidation of ZrB₂ at high temperature. To reach better A1(OH)₃‐Y(OH)₃ composite shell and higher coating ratio on the ZrB₂ particles surfaces, ZrB₂ particles must be adequately dispersed in the ZrB₂ suspension during the coating process. The dispersibility of ZrB₂ particles under different conditions is investigated by the sedimentation method. Through test and analysis, the optimum conditions of the dispersibility of ZrB₂ particles in the ZrB₂ suspension are sedimentating for 15 minutes, ultrasonic dispersion for 10 minutes, the lower ZrB₂ concentration, pH=9, the dispersant content for the 2% volume of ZrB₂ suspension, and using the polyelectrolyte dispersant, respectively.

Keywords:

• Technologcial conditions
• dispersibility
• ZrB₂ particles
• sedimentation method

Thanks for financial support of the National Science Foundation of China, apparatus support of the key lab of nonferrous materials and new processing technology, Guilin University of Technology, China.