【作者】 集兴伟；

【导师】 马壮；

【作者基本信息】 辽宁工程技术大学 ， 材料加工工程， 2011， 硕士

【摘要】 本文通过Al-TiO₂-B₂O₃反应体系在AZ31B表面原位合成了Al₂O₃-TiB₂复相陶瓷涂层。研究了不同的球磨工艺对粉体粒度分布、表面形貌的影响及添加剂Zn粉和Bi₂O₃对反应体系的活化效果;评价了涂层的结合强度、抗热震性能、耐磨性和耐蚀性等性能。获得如下研究成果:添加的Zn粉和Bi₂O₃对原始反应体系Al-TiO₂-B₂O₃均有活化效果,二者组成的复合反应体系分别在400℃和500℃都可发生反应,但Bi₂O₃的活化效果更加明显。由此以添加Bi₂O₃复合反应体在500℃制备的涂层,其物相组成为Al₂O₃、TiB₂并含少量未发生反应的Al、TiO₂以及辅料反应生成的Cr₂O₃等。当涂层骨料中Al、TiO₂和B₂O₃物质的量比为10:3:3并添加10%Bi₂O₃,骨料与粘结剂的质量比为1.35:1时,涂层性能最佳;结合强度可达14.78MPa,热震次数可达45次,磨粒磨损相对于基体提高3.56倍,粘着磨损相对于基体提高3.63倍;耐酸性能提高8.17倍,耐盐性能提高6.61倍。封孔后提高倍数更多。更多还原

【Abstract】 The Al₂O₃-TiB₂ multiphase ceramic coating is in-situ synthesized through Al-TiO₂-B₂O₃ reaction system on AZ31B alloy surface. Study on the influence of the different ball grinding process on powder particle distribution, surface morphology and the activation effect of additives Zn powder and Bi₂O₃ to Al-TiO₂-B₂O₃ reaction system. The coatings′properties such as bond strength, wear resistance, corrosion resistance etc…are evaluated. Research results are obtained as follows:Results indicate that there are activation effects after adding Zn powder and Bi₂O₃ to Al-TiO₂-B₂O₃ primitive reaction system. Different complex reaction system respectively at 400℃and 500℃have reacted, but it is more apparent activation effect adding Bi₂O₃. Accordingly, adding Bi₂O₃ complex reaction system is used and the coating formed at 500℃is composed of Al₂O₃, TiB₂ and a few of Al, TiO₂ and Cr₂O₃. When the ratio of Al to TiO₂ and to B₂O₃ is 10:3:3 and adding 10% Bi₂O₃ in amount of substance and of the aggregate to adhesive is 1.35:1 in weight, the coating is the best. Its bonding strength can reach 14.78MPa, thermal shock times can reach 45, abrasive wear resistance improves 3.56 times than the base AZ31B, adhesive wear resistance improves 3.63 times than the base AZ31B, acid resistance performance improves 8.17 times and salt resistance performance improves 6.61 times. It is improved more times after sealing hole.更多还原