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一、大功率三、四极管的结构与工艺本文记述在电子管中使用锆粉的某些问题,首先是有关三、四极管阴极的问题,目前,这些阴极绝大多数用钍钨丝制造,其中氧化钍的含量在1.5％左右。阴极的形状有π形、有螺旋形还有编成网状的。对于网状阴极,先把原来绕在圆轴上的丝改绕在和编网时一样的直径和倾角的螺旋心模上,在氢气中1300℃下定形,然后丝料才可以平整地在模具上排成网状进行交叉点焊。阴极制好并装于管芯上之后,要在真空罩内或氢气中充入碳氢化合物(如苯)蒸汽,同时把阴极通电加热到2500°K左右,使在钍钨丝表面形成一层由数μ到30μ左右厚的W_2C+WC层,经过这样处理以后,阴极
First, the structure of three high-power transistor and process This article describes some of the problems in the use of zirconium powder tube, the first is about the cathode of the three-transistor, at present, most of these cathodes are made of thorium tungsten wire , Of which thorium oxide content of about 1.5%. The shape of the cathode is π-shaped, spiral-shaped and reticulated. For the mesh cathode, the original winding around the axis of the wire around the network and winding the same diameter and inclination of the spiral heart mode, set in hydrogen at 1300 ℃, and then the wire can be smooth in the mold Lined up for cross-welding network. Cathode made good and mounted on the die, the vacuum hood or hydrogen filled with hydrocarbons (such as benzene) steam, while the cathode current is heated to 2500 ° K or so, the formation of a layer of thorium tungsten surface By the number of μ to 30μ thick W_2C + WC layer, after such treatment, the cathode