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采用固固掺杂、液固掺杂和液液掺杂方法制备了稀土氧化物掺杂钼粉,随后利用等离子体快速烧结(spark plasma sinterin,SPS)和传统的压制与高温烧结分别制备稀土-钼金属陶瓷材料,利用金相显微镜、发射性能测试方法对样品的微观结构和二次电子发射性能进行了研究。结果表明:稀土氧化物均匀掺杂和组织的细化有利于材料发射性能提高。经过高温氢气处理,使得样品激活温度大幅降低,发射系数大幅提高。
The rare-earth oxide doped molybdenum powder was prepared by solid-solid-state doping, liquid-solid doping and liquid-liquid doping method. Then, spark plasma sinterin (SPS) and conventional pressing and high- Molybdenum cermet materials, the microstructure and the secondary electron emission properties of the samples were studied by metallographic microscope and emission performance test. The results show that the uniform doping of rare earth oxides and the refinement of the microstructure facilitate the improvement of the emission properties. After high-temperature hydrogen treatment, sample activation temperature is greatly reduced, the emission coefficient increased significantly.