对W-La2O3合金在入射电子束不同能量密度辐照下的烧蚀性能进行了研究.结果表明:随着烧蚀时间的延长,表面温度上升,温度与烧蚀时间的关系近似呈线性,热流密度增加,表面温度在相同时间内上升幅度增大.在热流密度为0.5MW/m2烧蚀时,样品完好.热流密度为3MW/m2时,表面无宏观裂纹,试样表层几个微米内出现微裂纹,微裂纹沿钨晶粒边界交织成网状分布.热流密度为5MW/m2时,试样表层约十几个微米深度内出现熔融,基体晶粒组织无变化.当热流密度增加至8MW/m2时,试样熔化深度过半,内部较大的热应力导致试样扭曲变形失效破坏.W-La2O3合金抗烧蚀性能较好,热流密度增加到5MW/m2时,烧蚀率很小且变化不大,随着入射电子束热流密度增加,抗烧蚀性能下降,烧蚀率逐渐增大,当热流密度增加到8MW/m2时,质量烧蚀率达到2%.
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