Ablation Property of ZrB2-SiC Composite Sharp Leading Edges with Varying Radiuses of Curvature under Oxy-acetylene Torch

摘要：

　　Ablation behavior of ZrB2-SiC sharp leading edges with five different curvature radiuses was investigated using an oxy-acetylene torch.During the test,the curvature radiuses were 0.15 mm,0.5 mm,1.0 mm,1.5 mm,and 2.0 mm,respectively.Under the same ablation condition,the smaller was the radius,the severer ablation underwent.The sharp leading edge with a curvature radius of 0.15 mm had the highest surface temperature and maximum surface temperature rising rate,exceeded 2100 ℃ in less than 30 s.However,the surface of sharp leading edge with a curvature radius of 2.0 mm achieved only 1900 ℃ in more than 60 s.After 5 min ablation,the mass and linear ablation rates were measured.All the five sharp leading edges evolved to nearly a same radius after ablation.The microstructure of the oxidation layers was also investigated.A ZrO2-SiO2 layer generated from oxidation of ZrB2-SiC acts as a thermal barrier and reduces the diffusion of oxygen.

关键词： ZrB2-SiC composite Sharp leading edges Radius of curvature Ablation

作者: Rujie He Xinghong Zhang Ping Hu

作者单位: National Key Laboratory of Science and Technology on Advanced Composites in Special Environments,Harbin Institute of Technology,Harbin 150001,P.R.China

会议类型: 国际会议

会议名称: The Seventh China International Conference on High-Performance Ceramics (第七届先进陶瓷国际研讨会(CICC-7))

会议地点: 厦门

会议语种:英文

页码: 710-714

在线出版日期: 2011-11-04（万方平台首次上网日期，不代表论文的发表时间）