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由于难熔金属抗水滴和抗冰粒子侵蚀,因而它是引人注意的再入飞行器头锥的候选材料。本文介绍了钨、钨/25％铼和钼的烧蚀模型,这些模型包含有气体有限扩散的热化学烧蚀和液相移动。假设钨烧蚀在气相中只在其烧蚀表面呈动态化学平衡。这些模型已编入计算机程序,该程序也包括了外形变化、附面层转变、表面粗糙度和两维瞬时传导。用这些模型已经获得了高、低压电弧喷射试验、弹道靶点火试验以及探空火箭飞行试验的良好的相互关系。
It is a compelling candidate for reentry head cone due to the refractory metal resistance to water droplets and the erosion of ice particles. This article presents ablation models of tungsten, tungsten / 25% rhenium and molybdenum. These models include thermochemical ablation and liquid phase movement with limited diffusion of gases. It is assumed that tungsten ablation in the gas phase is only at its ablative surface in a dynamic chemical equilibrium. These models have been incorporated into computer programs that also include shape changes, surfacing, surface roughness, and two-dimensional transient conduction. Using these models, good correlations have been obtained for high and low voltage arc jet tests, ballistic target ignition tests, and sounding rocket flight tests.