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钨的熔点高(3400℃左右),比重大(19.3g/cm~3),铂的熔点虽稍低(1769℃),但比重更大(21.45g/cm~3)。而且铂钨合金的电阻高,温度系数低,还能降低栅极的发射率。所以铂钨合金或覆有铂的钨丝广泛用于精密电子仪器及大功率真空管的灯丝。去年我们接受了氙灯阴极的加工任务。其形状如图1所示,技术要求为:粗加工表面粗糙度Ra1.6,抛光表面粗糙度Ra0.1,加工过程中
Tungsten has a high melting point (about 3400 ℃) and a large specific gravity (19.3g / cm 3). The melting point of platinum is slightly lower (1769 ℃) but higher (21.45g / cm 3). And platinum-tungsten alloy high resistance, low temperature coefficient, but also reduce the gate emissivity. So platinum tungsten alloy or platinum covered with tungsten wire is widely used in precision electronic instruments and high-power vacuum tube filament. Last year we accepted the xenon lamp cathode processing tasks. Its shape shown in Figure 1, the technical requirements for: roughing surface roughness Ra1.6, polished surface roughness Ra0.1, during processing