Al<sub>2</sub>O<sub>3</sub>/ NiAl 复相陶瓷料浆流变性的研究

Al₂O₃/ NiAl 复相陶瓷料浆流变性的研究

摘要: 主要对Al₂O₃ / NiAl 复合体系料浆的稳定分散特征作了初步研究。结果表明: 对Al₂O₃ 和NiAl 单体系,当溶液的pH> 10. 6 时, 颗粒表面的a 电位达到最大值; 当料浆中Al₂O₃ 含量在40 vol%以上时, 其稳定分散的最佳pH 范围为11～12, 当料浆浓度为40 vol% , 50 vol% 和60 vol%时, 最佳分散剂用量分别为0. 6 wt% , 2. 8 wt% 和8. 0 wt% ; 对浓度小于30 vol% 的NiAl 料浆, 其稳定分散的最佳pH 范围为9～11, 分散剂最佳用量为0. 5 wt% ; 在最佳分散条件下制得的50 vol% (Al₂O₃ / NiAl-20) 的复相陶瓷料浆具有良好的稳定分散性。

Abstract: The present paper deals with a primary study on the dispersion behavior of Al₂O₃ /NiAl slurries. The experiments are shown as follows: the zeta potential of both Al₂O₃ and NiAlparticles reaches the highest point in a slurry with respect to pH> 10. 6. For Al₂O₃ slurries with a solid content higher than 40 vol% , the optimum pH range is 11～12; the optimum dispersant contents of 40 vol% , 50 vol% and 60 vol% slurries are 0. 6 wt% , 2. 8 wt% and 8. 0 wt% respectively.For NiAl slurries with a solid content less than 30 vol% , the optimum pH range is 9～11; the optimum dispersant content is 0. 5 wt% . The slurry with 50 vol% ( Al₂O₃ / NiAl-20) exhibits excellent dispersion behavior under the best dispersing conditions.