Self-propagating High-temperature Synthesis of Al203-TiB2 Coatings by Aluminothermic Reactions
The AI2O3-TiB2 coatings were fabricated on Q235 steel by self-propagating high-temperature synthesis (SHS) process using aluminothermic reactions with aluminum, titania, boron oxide and ferric oxide powders. The effect of the content of excessive aluminum in the reactants on Al2O3-TiB2 coatings was studied when only Al-TiO3B2O3 system was used for preparation of the coatings. The results indicate that the combustion reaction cannot occur when excessive aluminum is over 40wt％ and the coating has good quality when excessive aluminum is 20wt％. In order to improve the bonding of the coating and substrate and optimize the ratio of Al2O3/TiB2, composite reaction systems Al-TiO2-B2O3 and Al-Fe2O3 were used for the preparation of Al2O3-TiB2 coatings. The XRD result shows that the coatings contain FeAl intermetallic compound which can improve efficiently the interface bonding of the coating and substrate. The percentage of Al-Fe2O3 system in reactants has only a small effect on the hardness of Al2O3-TiB2 coating, which is about 22000 MPa (Hv), but has an obvious effect on the morphology and interface bonding of the coatings.
Al2O3-T1B2 coating SHS aluminothermic reaction
Wang Gang Jiang Shaoqun Wang Zehua Cai Dong Yi Yu Zhou Zehua
Hohai University, Nanjing 210098, China
国际会议
西安
英文
215-218
2011-05-11（万方平台首次上网日期，不代表论文的发表时间）