硼酸铝晶须增强铝硅基复合材料活塞烧蚀研究

Analysis of ablation properties of piston of aluminum borate whisker reinforced Al-Si matrix composites

为了研究硼酸铝晶须增强铝硅基复合材料活塞的烧蚀性能,对硼酸铝晶须增强铝硅基复合材料的烧蚀性能进行了测试和分析,并分析了该种复合材料的烧蚀机理和烧蚀模型,同时采用有限元方法对复合材料活塞的烧蚀性能进行了模拟分析。结果表明:硼酸铝晶须增强铝硅基复合材料强度较大、结构密集,烧蚀量很小;材料的烧蚀是气流剥蚀和熔化烧蚀两方面的作用结果;建立的烧蚀模型及计算方法能够较好地完成对活塞的模拟计算。研究结果证明硼酸铝晶须增强铝硅基复合材料在抗烧蚀方面是理想的活塞材料。

To assess ablation properties of piston made from aluminum borate whisker-reinforced A1-Si matrix com- posites, the ablation behavior of aluminum borate whisker-reinforced A1-Si matrix composites was investigated. The ablation model and mechanism of Al-Si matrix composites were analyzed. In addition, finite element simulation on the ablation behavior of piston of Al-Si matrix composites was conducted. Results show that the strength of the aluminum borate whisker-reinforced Al-Si matrix composites was large, the structure was dense, and the ablation volume was small. The ablation mechanism of the Al-Si matrix composites was a combination of gas flow erosion and melting ablation. The established ablation model and the calculation methods could properly complete the simulative calculation for piston. The aluminum borate whisker-reinforced A1-Si matrix composite is an ideal anti-ablation piston material.