高温用钨钼渗铜材料的抗烧蚀性研究

THE ABLATION PROPERTIES OF W-Mo-Cu COMPOSITES USED IN HIGH-TEMPERATURE FIELD

采用熔渗法制备了钨钼渗铜材料,研究了不同钨钼成分配比和不同骨架相对密度对高温用钨钼渗铜材料的抗烧蚀性能的影响。研究表明:对于相同或相近骨架相对密度材料,Mo含量小于30%(质量分数)的材料烧蚀坑深度最大不超过0.8 mm,抗烧蚀性能良好,而超过30%(质量分数)时,抗烧蚀能力随Mo含量增加急剧下降;对于相同成分材料,骨架相对密度越高,抗烧蚀性越好;钨钼渗铜材料的烧蚀主要包括骨架基体的烧蚀和铜的发汗冷却作用,其机理为热化学与机械剥蚀综合作用的结果。

Tungsten and molybdenum infiltrated copper composite was prepared by infiltration.The ablation properties of W-Mo-Cu composites were studied through different molybdenum content and skeleton densities.The results show that:for the materials of similar skeleton density,the ablation resistance is excellent when the content of Mo is less than 30wt%,while the maximum ablation depth does not exceed 0.8 mm.When the content of Mo is more than 30wt%,the ablation resistance of the composites sharply reduced with the increasing of Mo content.For the same component materials,the ablation resistance is increased with the skeleton density increasing.The ablation of W-Mo-Cu composite includes erosion of the skeleton matrix and the transpiration cooling effect of copper,and thermo-chemical and mechanical erosion for the combined result.