Microstructure and ablation behavior of Zr-based ultra-high-temperature gradient composites

Zr基超高温梯度复合材料的显微组织和烧蚀行为

To obtain high-performance Zr-based ultra-high-temperature composites,Zr-based ultra-high-temperature gradient composites were prepared by changing the laying method of the infiltrant via reactive melt infiltration.The effects of different infiltrant laying methods on the microstructure and ablative properties of Zr-based ultrahigh-temperature gradient composites were investigated.The results showed that the gradient structure of the Zr-based ultrahigh-temperature gradient composites differed when the composition ratio of the infiltrant was changed.When the thicknesses of the Zr/Mo/Si layers were 6/4/12 mm and 8/2/12 mm,the SiMoZrC solid solution content in the samples increased and decreased along the infiltration direction,respectively.The gradient samples were ablated in an oxyacetylene flame at 3000°C for 40 s.The ablation resistance of the sample was the highest when the infiltrant was a powder and the thickness of the Zr/Mo/Si layer was 6/4/12 mm.

为了获得高性能Zr基超高温复合材料,利用反应熔渗工艺,通过改变原料的铺制方式得到Zr基超高温梯度复合材料。研究原料的铺制方式对梯度Zr基超高温复合材料显微组织和烧蚀性能的影响。结果表明,当改变熔渗原料的成分比例时,梯度Zr基超高温复合材料的梯度结构不同,当Zr/Mo/Si层厚度分别为6/4/12 mm和8/2/12 mm时,样品中SiMoZrC固溶体的含量沿着熔渗方向增加和减少。将梯度样品在3000℃的氧乙炔火焰下烧蚀40 s,当样品的熔渗原料状态为粉末、Zr/Mo/Si层厚度为6/4/12 mm时,材料的抗烧蚀性能最好。