发明公开
EP0179513A1 Method of manufacturing a scandate dispenser cathode and dispenser cathode manufactured by means of the method
失效
生产含有和由该方法分配器阴极产生的钪酸盐阴极的分配器的方法。
- 专利标题： Method of manufacturing a scandate dispenser cathode and dispenser cathode manufactured by means of the method
- 专利标题（中）： 生产含有和由该方法分配器阴极产生的钪酸盐阴极的分配器的方法。
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申请号： EP85201583.3申请日： 1985-10-02
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公开(公告)号： EP0179513A1公开(公告)日： 1986-04-30
- 发明人: Hasker, Jan , Hokkeling, Pieter , Van Esdonk, Johannes , Van Lith, Josef Johannes
- 申请人： Philips Electronics N.V.
- 申请人地址： Groenewoudseweg 1 5621 BA Eindhoven NL
- 专利权人： Philips Electronics N.V.
- 当前专利权人： Philips Electronics N.V.
- 当前专利权人地址： Groenewoudseweg 1 5621 BA Eindhoven NL
- 代理机构： Koppen, Jan
- 优先权： NL8403032 19841005
- 主分类号： H01J9/04
- IPC分类号： H01J9/04 ; H01J1/28
摘要：
A method of manufacturing a scandate dispenser cathode having a matrix at least the top layer of which at the surface consists substantially of tungsten (W) and scandium oxide (Sc 2 O 3 ) and with emitter material in or below said matrix. If said method comprises the following steps:
a) compressing a porous plug of tungsten powder;
b) heating said plug in a non-reactive atmosphere and in contact with scandium to above the melting temperature of scandium;
c) cooling the plug in a hydrogen (H 2 ) atmosphere;
d) pulverizing the plug to fragments;
e) heating said fragments to approximately 800°C and firing them at this temperature for a few to a few tens of minutes in a hydrogen atmosphere;
f) grinding the fragments to scandium hydride-tungsten powder (ScH 2 /W);
g) compressing a matrix or a top layer on a matrix of pure tungsten from said ScH 2 /W powder or from a mixture of this powder with tungsten powder;
h) sintering and cooling the said matrix;
i) bringing emissive material in the cathode, a scandate dispenser cathode is obtained the recovery of which after ion bonbardment occurs better than in cathodes having Sc 2 O 3 . The scandium is also distributed more homogeneously in the cathode than in cathodes having Sc 2 O 3 grains.
a) compressing a porous plug of tungsten powder;
b) heating said plug in a non-reactive atmosphere and in contact with scandium to above the melting temperature of scandium;
c) cooling the plug in a hydrogen (H 2 ) atmosphere;
d) pulverizing the plug to fragments;
e) heating said fragments to approximately 800°C and firing them at this temperature for a few to a few tens of minutes in a hydrogen atmosphere;
f) grinding the fragments to scandium hydride-tungsten powder (ScH 2 /W);
g) compressing a matrix or a top layer on a matrix of pure tungsten from said ScH 2 /W powder or from a mixture of this powder with tungsten powder;
h) sintering and cooling the said matrix;
i) bringing emissive material in the cathode, a scandate dispenser cathode is obtained the recovery of which after ion bonbardment occurs better than in cathodes having Sc 2 O 3 . The scandium is also distributed more homogeneously in the cathode than in cathodes having Sc 2 O 3 grains.
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