溶胶-凝胶法制备纳米复合Mo-La2O3阴极

A Mo-La2O3 Nanocomposite Cathode Prepared by Sol-Gel and the Character of the Cathode

摘要:

采用溶胶-凝胶法制备出平均粒径小于60nm的Mo-La2O3粉末。将所制备出的纳米复合Mo-La2O3粉末经冷压、热压工艺后烧结成纳米复合Mo-La2O3阴极。发现用溶胶-凝胶法制备的Mo-La2O3阴极组织均匀，晶粒细小，La2O3粒子晶粒大多在100nm以下，且弥散分布在晶内及晶界上。在燃弧实验中发现用溶胶．凝胶法制备的纳米复合Mo-La2O3阴极击穿点分布存阴极表面的大部分面积上，烧蚀坑浅，且击穿优先发生在La2O3相上。

Abstract:

Nano-Mo-La2O3 power with the average grain size being about sixty nanometers was prepared by the sol-gel. Mo-La2O3 electrical contact material was fabricated by hot pressure sintering. It is found that the electrical contact material is uniform, La2O3 particles were distributed around the grain boundary or in the crystal, and the average grain size of the particles are mostly less than one hundred nanometer. After breakdown tests, the breakdown points distribute around the whole face, the electron erosion is shallow, and the electron erosion firstly occurred in the La2O3 phase.