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铂为白色的金属,化学稳定性很好,不被单一的酸腐蚀,铂中加入铱后大大提高了它的抗腐蚀性能。铂铱合金(pt—Ir—25)熔点为1840℃。因其硬度高、熔点高,抗腐蚀能力高,有低的接触电阻,所以成为经典的电接触材料用在航空发动机的点火器上和高灵敏继电器上。一、铂铱合金与钢的钎焊铂铱(pt—Ir)与钢,用紫铜作钎料,在氢气保护下进行炉钎焊不会有什么困难。其钎焊工艺如下: (一)钎焊设备:25～30KVA箱式炉加热,容器用1Cr18Ni9Ti不锈钢焊接而成。
Platinum is a white metal, chemical stability is good, not a single acid corrosion, after adding iridium platinum greatly enhance its corrosion resistance. Platinum iridium alloy (pt-Ir-25) melting point of 1840 ℃. Because of its high hardness, high melting point, high corrosion resistance, low contact resistance, so become a classic electrical contact materials used in the ignition of aero-engines and high sensitive relays. First, the platinum iridium alloy and steel brazing Platinum iridium (pt-Ir) and steel, with copper as brazing filler metal, under the protection of hydrogen furnace brazing will not have any difficulty. The brazing process is as follows: (A) brazing equipment: 25 ~ 30KVA box furnace heating, container 1Cr18Ni9Ti stainless steel welded together.