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采用高分辨透射/扫描电镜,X射线衍射和俄歇探针等分析手段对实用型的FU-6051电子管的碳化Mo-La2O3阴极显微组织结构进行了观察分析。碳化Mo-La2O3阴极碳化层为疏松多孔的Mo2C块状组织,其中有许多垂直于丝轴方向的晶界与孔洞串,相互贯通直至阴极表面。碳化层与芯部基体钼结合良好,两者间无明显的过渡层。活性物质La2O3在阴极的碳化层和基体中分布均匀,但在阴极表面有相当程度的富集。La2O3在碳化层中以两种方式存在:在晶界、孔洞中以微米级的颗粒富集,在Mo2C晶体内部弥散分布纳米级La2O3粒子。
The structure of Mo-La2O3 cathode microstructure of practical FU-6051 tube was observed and analyzed by high resolution transmission / scanning electron microscopy, X-ray diffraction and Auger probe. Carbide Mo-La2O3 cathode carbonization is loose porous Mo2C massive structure, in which there are many perpendicular to the axis of the grain boundary and hole string, through to each other until the cathode surface. Carbide and the core matrix molybdenum well, there is no obvious transition between the two layers. The active material, La2O3, is uniformly distributed in the carbonization layer and the matrix of the cathode, but has a considerable degree of enrichment on the cathode surface. La2O3 exists in the carbonized layer in two ways: in the grain boundary, the pores are enriched with micron-sized particles, and nanoscale La2O3 particles are dispersedly distributed in the Mo2C crystal.