The Preparation Process and Development Analysis of Single Crystal LaB6 for Thermionic Cathode
Single crystal hexaboride LaB6 has excellent hot electron emission performance and chemical stability.It is an ideal material for space thermionic cathode emission sources,which directly affects its emission efficiency and lifespan.With the demonstration of high-power and long-life space missions for space electric propulsion systems,the preparation technolo-gy of large size,low-cost,and high-purity single crystal LaB6 is becoming increasingly important.Based on the research on the development process of LaB6 matrix both domestically and internationally,combined with the preparation technology of single crystal LaB6,aiming at the application requirements of space electric propulsion,the key technologies and difficulties in crystal preparation are analyzed.Some suggestions for the engineering development of single crystal LaB6 are put forward.
hot electron cathodeelectric propulsion systempowder developmentsingle crystal LaB6
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