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根据毫米波器件对阴极提出的需高发射电流密度和低工作温度的要求,从国内外有关资料获悉:多年来在研制铝酸盐钡钨阴极的基础上,不论在海绵基体或发射物质方面均进行了大量工作,出现了能提供大电流密度的敷膜式M型阴极和钨酸钡锶阴极,但制备工艺复杂.苏联自一九六七年开始,研究制成了压制型钪酸盐阴极,由于<3BaO·2Sc_2O_3>熔点高,很难制成工艺简单的浸渍型阴极.七十年代,美国、荷兰相继制成了复合钪酸盐阴极,降低了盐的熔点,从而制成了浸渍型钪酸盐阴极.由于后者工艺简单、制造方便,加
According to the requirements of high current density and low working temperature of the millimeter wave device for the cathode, it is learned from relevant data both at home and abroad: Based on the development of the aluminate barium tungsten cathode for many years, both in terms of the sponge matrix or the emitting substance A lot of work has been carried out, there have been deposited to provide a large current density M-type cathode and barium strontium tungstate cathode, but the preparation process is complicated .Sloth beginning in 1967, made of pressed type scandate cathode , Because of the high melting point <3BaO 2Sc_2O_3>, it is difficult to make a simple impregnated cathode technology.In the seventies, the United States, the Netherlands have made a composite scandate cathode, reducing the melting point of salt, which made the impregnated Scandate cathode. As the latter process is simple, easy to manufacture, plus