Anomalous surface analysis of tungsten infiltrated copper ablation
Aiming at the phenomenon of abnormal ablation on the surface of W-7Cu infiltrated with tungsten and copper,samples were taken from the rudder surface and guard plate of returned part,and the ablative characteris-tics,microstructure,surface debris,fracture morphology and metallographic structure of samples were compared and analyzed.The results showed that rudder surface's ablation was more sever,both propellant residue on the surfaces were distributed,the fracture apperance was dominated by transgranular and intergranular fracture,no abnormal tissue was found;According to the results of metallographic and transmission electron microscope,the cavity of rudder surface is more than that of the guard plate,and copper leaks exist in both areas,energy spec-trum analysis showed that the copper content has different gradients,the copper precipitation at rudder surface was significant that affected by three kinds of working conditions including temperature,time and scour speed.The study conclusions can provide a basis for subsequent failure analysis and quality control of tungsten-impreg-nated copper gas rudder products.
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