摘要
本文通过Al-TiO_2-B_2O_3反应体系在AZ31B表面原位合成了Al_2O_3-TiB_2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Bi_2O_3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Bi_2O_3对原始反应体系Al-TiO_2-B_2O_3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Bi_2O_3的活化效果更加明显。由此以添加Bi_2O_3复合反应体在500℃制备的涂层,其物相组成为Al_2O_3、TiB_2并含少量未发生反应的Al、TiO_2以及辅料反应生成的Cr_2O_3等。当涂层骨料中Al、TiO_2和B_2O_3物质的量比为10:3:3并添加10%Bi_2O_3,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。
The Al_2O_3-TiB_2 multiphase ceramic coating is in-situ synthesized through Al-TiO_2-B_2O_3 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 Bi_2O_3 to Al-TiO_2-B_2O_3 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 Bi_2O_3 to Al-TiO_2-B_2O_3 primitive reaction system. Different complex reaction system respectively at 400℃and 500℃have reacted, but it is more apparent activation effect adding Bi_2O_3. Accordingly, adding Bi_2O_3 complex reaction system is used and the coating formed at 500℃is composed of Al_2O_3, TiB_2 and a few of Al, TiO_2 and Cr_2O_3. When the ratio of Al to TiO_2 and to B_2O_3 is 10:3:3 and adding 10% Bi_2O_3 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.
引文
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