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精密高电阻合金是电讯、仪器仪表中必不可少的一种材料,通常以线材(少量以带及片材)供应使用。它具有如下几个特点: ①电阻温度系数(αβ)小,R_t=R_(20)[1+2(t-20)+β(t-20)~2];②电阻率高(p>1.0Ωmm~2/M),电阻值稳定,历年变化小;③对铜热电势小;④加工性能良好,能制成细丝,⑤焊接性能好;⑥机械性能好;⑦耐腐蚀、抗氧化性好,有一定的耐热性。其中1～3项通常称为合金的电气性能。锰铜是精密电阻合金中的一个老产品,至今已有七、八十年的历史,由于它具很有
Precision high-resistance alloy telecommunications, instrumentation is an essential material, usually wire (a small amount of tape and sheet) supply use. It has the following characteristics: ① low temperature coefficient of resistance (αβ), R_t = R 20 (1 + 2 (t-20) + β Ωmm ~ 2 / M), the resistance is stable, the change over the years is small; ③ the thermoelectric power of copper is small; ④ processing performance is good, can be made of filaments, ⑤ welding performance is good; ⑥ good mechanical properties; ⑦ corrosion resistance, oxidation resistance Well, there is some heat resistance. Of which 1 to 3 are commonly referred to as the electrical properties of the alloy. Manganese copper is an old product of precision resistance alloy, it has been seven or eight decades of history, because it has a very good