| 摘要 |
A primarily polycrystalline but partially amorphous electrical insulator can hermetically seal first and second spaced electrical terminals, one made from an anodized aluminum and the second made from a beryllium copper, Kovar, an alloy of iron and cobalt or an alloy of beryllium, copper, nickel and gold. Nickel may be diffused into the beryllium copper and a noble metal may be deposited on the nickel. The insulator provides a flat meniscus to abut a corresponding electrical insulator in a cable. The insulator may provide an electrical impedance of approximately 50 ohms, an electrical resistivity greater than approximately 1018 ohms and a dielectric constant of approximately 6.3. The insulator operates satisfactorily in a frequency range to approximately 40 gigahertz. The insulator may be made from the following mixture: - Range of Relative - Material Amounts by Weight - Red Lead (PbO) 156-279 - Silicon Dioxide (Quartz) 340 - Sodium Carbonate 139-165 - Potassium Carbonate 151-189 - Lithium Carbonate 64-148 - Boric Acid 111-183 - Calcined Alumina 47-128 - The mixture may be heated at about 400 DEG F. for about 10 minutes, then at about 600 DEG F. for about 60 minutes and then at about 1500 DEG F. for about 120 minutes. The mixture may be stirred while being heated at about 600 DEG F. and 1500 DEG F. The mixture may then be quenched in water to form a frit. The frit may be disposed between the first and second terminals and the assembly may be formed by heating at about 200 DEG F. for about 1 hour and then at about 1040 DEG F. for about 40 minutes.
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