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3865 |
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Interfaces of ZrB2-ZrC-SiC-ZrO2 composite coating on AZ91D surface using mixed powders through atmospheric plasma spray |
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Peihu Gao* / Xi'an Technological University, China Jianping Li/ School of Materials and Chemical Engineering, Xian Technological University,, China Zhong Yang/ School of Materials and Chemical Engineering, Xian Technological University, China Yongchun Guo/ School of Materials and Chemical Engineering, Xian Technological University, China Wei Zhou/ Shaanxi Bangxin Surface Engineering Company, China Yong Li/ Xian Thermal Power Research Institute, China |
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ZrB2/ZrC/SiC/ZrO2 composite ceramics were thought to be excellent materials with good resistance to oxidation at high temperatures. The sintering of ZrB2/ZrC/SiC/ZrO2 composite ceramics needed to be protected in the atmosphere and the sinter temperature was higher than 1500oC. While, ZrB2/ZrC/SiC/ZrO2 composite ceramics could be prepared on the surface of large workpieces through atmospheric plasma spraying relatively easy. In this work, ZrB2/ZrC/SiC/ZrO2 composite ceramics were designed with ZrB2 and ZrC particles, about 10 ¼m, as main phases surrounded with SiC and ZrO2 particles, which were about 1 ¼m. ZrB2, ZrC, SiC and ZrO2 powders were mixed through ball milling. ZrB2/ZrC/SiC/ZrO2 composite ceramic coatings were prepared with mixed feedstocks through atmospheric plasma spray on the surface of AZ91D with NiCoCrAlTAY bonding coat deposited through high velocity oxygen-fuel spraying. It was found that ZrB2 and ZrC particles distributed uniformly with SiC and ZrO2 particles dispersed at the interfaces between ZrB2 and ZrC particles in the ZrB2/ZrC/SiC/ZrO2 composite ceramic coatings, which were similar to the composite feedstocks structures. There was B2O5Si glass phase formed at the interfaces of ZrB2, ZrC, SiC and ZrO2 particles observed from TEM and XRD, which was helpful to the high temperature resistance. |