浸渍镱酸盐阴极

本文介绍了一种新型钡钨阴极镱酸盐阴极,这种阴极是以多孔钨海绵为基体,浸渍镱酸盐发射材料而制成。该阴极具有大的次级电子发射系数,在室温下,为4.1;较大的热发射,在1000℃,可支取6A/cm2的电流密度,而且阴极表面发射比较均匀;有较强的抗氧中毒能力;是一种较好的实用阴极。     

STUDY ON EMISSION PROPERTIES OF La-WC CATHODE AND ITS RESISTANCE TO POISONING OF OIL VAPOUR

In this paper,some proposals to explain the emission properties of the La-WC cathode and itsresistance to poisoning of oil vapour are presented and they are demonstrated to be correct by experiments.In the operating temperature range of the La-WC cathode,lanthanum would react chemically with tungstencarbide and form La_2C_3 which is a kind of good emissive material with a work function approximate to thatof lanthanum and can also combine with lanthanum into a eutectic.The eutectic easily wets the tungstenmatrix and migrates over its surface to form a thin emission film.As a result,cathode emission is greatlyincreased.Morever,the La-WC cathode has the capability to resist poisoning of oil vapour.The reason isthat the carbon from oil vapour reacts with lanthanum in the eutectic,thus forming La_2C_3 which is also agood emissive material.     

A NEW Ba-W DISPENSER CATHODE IMPREGNATED WITH BARIUM YTTERBATE

A new kind of Ba-W dispenser cathode impregnated with barium ytterbate has been deve-loped.It has good properties;high coefficient of secondary emission,strong ability of resisting oxygenpoisoning,high thermionic emission current density and more uniform emission on the cathode surface.The cathode is suitable for using as an electron emitter for microwave tubes,especially magnetrons.     

对镧-碳化钨阴极发射大和抗油蒸汽中毒的探讨

本文提出了解释镧-碳化钨(La-WC)阴极发射大和抗油蒸汽中毒能力强的一些设想,并通过实验,验证了所提出的设想。在La-WC阴极的工作温度范围内,La和 WC发生化学反应,生成La2C3。La2C3也是一种良好的发射材料,它具有与镧相近的逸出功。La2C3能与镧形成共熔体,对钨基底浸润良好,易形成较好的发射层,而使发射显著增大。La-WC阴极抗油蒸汽中毒是由于污染的碳与共熔体中的镧形成La2C3,而La2C3也是良好的发射物质的缘故。     

一种抗中毒的阴极

正 随着各种特殊电真空器件和电子束设备的发展,要求阴极能适应相应的环境。如密封油膜光阀管,就需要能抵抗油蒸汽中毒的阴极。国外使用一种含钍的储备式阴极,但钍有放射性污染。我们研制了一种没有放射性污染的镧钨阴极。Albert等人曾发表过这类阴极的发射数据。Gallagher报道过这类阴极抗氧中毒的性能。但迄今,尚未见到这类阴极的其他性能和运用情况的报道。 几年来,我们对镧钨阴极进行了研究,选择了一种新配方,做出了以WC,La,Pt三