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AssigneeU.S. Philips Corporation
InventorsJacobus A.J.M. Deckers, Theodorus H. Weekers, Albert Manenschijn, Franciscus M.M. Snijkers, Petrus A.M. Van Der Heide
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A method of manufacturing a dispenser cathode, in which method a powder of a refractory metal and a scandium-containing powder are mixed with each other and pressed to form a cathode body. According to the invention at least both these powders and a suitable binder are mixed with each other to form a homogeneous suspension prior to the pressing operation and the whole mixture is subsequently cured and ground to granules having a larger average size and hence a greater fluidity than the grains of the starting powders. Subsequently the granules thus obtained are pressed to form a cathode body (2). The invention leads to a better processibility and greater convenience of handling of the starting powders so that notably very fine staring powders can be used, which results in cathodes (1) having a better recovery after ion bombardment as compared with cathodes manufactured in conventional manners which are necessarily based on relatively coarse powders.
A method of manufacturing a dispenser cathode, in which method a powder of a refractory metal and a rare-earth metal containing powder are mixed with each other and formed into a cathode body, characterized in that the two powders and a suitable binder are mixed with one another, in that the whole mixture is cured and ground to granules having a larger average size than the grains of the starting powders and in that the granules are subsequently pressed to form a cathode body.
A method of manufacturing a dispenser cathode, in which method a powder of a refractory metal and a scandium-containing powder are mixed with each other and formed into a cathode body, characterized in that the two powders and a suitable binder are mixed with one another, in that the whole mixture is cured and ground to granules having a larger average size than the grains of the starting powders and in that the granules are subsequently pressed to form a cathode body.
A method of manufacturing a dispenser cathode, in which method a powder of a refractory metal and scandium-containing powder are mixed with each other and formed into a cathode body, while the cathode body is also provided with a barium-containing component, characterized in that a powder or grains having an average grain size or less than 1 .mu.m is used as a starting material for the refractory metal, and in that a powder of grains having an average grain size or less than 10 .mu.m is used as a starting material for the scandium-containing material.
Dependencies are inferred from the claim text.