【作者】 林鹏；

【导师】 马壮；

【作者基本信息】 辽宁工程技术大学 ， 材料加工工程， 2009， 硕士

【摘要】 以Al-TiO₂-B₂O₃为反应体系,经机械球磨制成超细粉体,混以一定比例的磷酸二氢铝胶粘剂涂覆于Q235钢表面进行热固化,通过粉体颗粒之间的固相反应于700℃原位合成了Al₂O₃-TiB₂复相陶瓷涂层。用SEM、激光粒度分布仪、XRD、DTA等设备和手段研究了Al-TiO₂-B₂O₃复合粉体的微观形貌、粒度分布、物相组成、晶粒度变化等机械力化学及热化学特征;采用热力学、动力学方法研究了涂层的形成机理,并对涂层的结合强度、耐磨性等力学性能进行了测试。结果表明,机械力化学作用使Al-TiO₂-B₂O₃体系的热化学反应在670℃就可发生,由此在700℃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和MgAl₂O₄等。当涂层骨料中Al、TiO₂、B2O₃物质的量比为10:3:3,骨料与粘结剂的质量比为1.5:1时,涂层性能最佳,结合强度可达13.4MP,热震次数可达45次;耐磨性提高为基底的3.21倍。更多还原

【Abstract】 The Al-TiO2-B2O3 reaction system superfine powder made by mechanical ball milling is mixed with a proportional aluminum phosphate adhesive and deposited on the surface of Q235 and then undergo thermocuring, through the solid-state reaction of which, Al₂O₃-TiB₂ multiphase ceramic coating is in situ synthesized at 700℃.The mechano-chemical and thermo-chemical characteristics including micro-morphology, particle distribution, phase composition, grain size changes etc. of the Al-TiO₂-B₂O₃ composite powder are studied with SEM, laser fineness gage, XRD, DTA etc..The formation mechanism of coating is investigated with thermodynamics and dynamic method. The mechanical properties such as bond strength, wear resistance etc. is tested.Results indicate that the mechanochemical force can make the Al-TiO₂-B₂O₃ system react at 670℃. Accordingly, the coating formed at 700℃is composed of Al₂O₃, TiB₂ and a few of Al,TiO₂, Cr₂O₃ and MgAl₂O₄. When the ratio of Al to TiO2 to B₂O₃ is 10:3:3 in amount of substance and of the aggregate to adhesive is 1.5:1 in weight, the coating is the best. Its bonding strength can reach 13.4MP, thermal shock times can reach 45, and wear resistance improves 3.21 times than the base Q235.更多还原