C/C组合喉衬烧蚀试验方法及微观形貌对比

发展了一种C/C组合喉衬的烧蚀试验方法,采用该方法对C/C原始材料和经过热化学烧蚀后的C/C材料进行含铝工况试验,对比研究粒子对C/C材料表面微观形貌的侵蚀作用。试验表明,该方法能准确反映材料的实际烧蚀性能,确保对比材料烧蚀性能是在同工况下进行,也适用于各类不同喉衬材料的烧蚀性能对比。研究认为,热化学烧蚀起主导作用,有无粒子侵蚀对C/C材料烧蚀率的影响不大;粒子侵蚀对收敛段区域微观形貌影响最为严重,1号试件纤维单丝最尖锐,3号无锥尖形貌,2号呈圆台形貌,喉部区域无铝工况的纤维单丝比含铝工况尖锐;组合喉衬2号和3号因材料表面粗糙度的不同,造成微观形貌和烧蚀率差异,说明经烧蚀后的C/C材料再次烧蚀,其性能大幅下降,材料表面粗糙度越大,烧蚀率越大。

Ablation test method of C / C combination throat insert and comparative of micro-morphology

An ablation test method of the C/C combination throat insert was proposed.Particle erosion tests were performed on the C/C raw materials and C/C materials through thermo-chemical ablation by using this method to study the erosion of particles on the surface micro-morphology of the C/C material.The method can accurately reflect the actual ablation performance.Materials ablation properties were compared in the same conditions,meanwhile,this method can also be applied to ablation performance comparison of throat insert materials in various types.Studies show that the thermo-chemical ablation plays a leading role;particle erosions have little effect on C/C material ablation rate,but have great effect on micro-morphology of the convergent section area;fiber monofilaments in No.1 specimen are most sharp-pointed,which in No.3 are not conical,and in No.2 are cylindrical,fiber monofilaments in Al-free condition are sharper than that in aluminum condition in the throat area;No.2 and No.3 combination throat inserts have different micro-morphologies and erosion rates due to different material surface roughness,which shows that ablation performance of ablated C/C materials drops greatly,and the greater material surface roughness is,the greater ablation rate will be.