| 牌号 | EVANOHM® Alloy R |
| 厂家 | Carpenter Technology Corporation |
| 分类 | Nickel |
| 介绍 | EVANOHM® alloy R is principally a resistance alloy possessing a standard temperature coefficient of ±20 parts per million per °C and a very low thermal EMF versus copper in heavy sizes. It also displays high tensile strength in fine sizes, high corrosion resistance and is nonmagnetic. EVANOHM alloy R is exceptionally stable (1 to 15 microhms per year). While many other alloys are susceptible to precipitation hardening which changes electrical properties unpredictably, the resistivity of EVANOHM alloy R always increases during heat treatment. Once obtained, its resistivity does not change significantly even when it is used at temperatures as high as 204°C (400 °F). The TCR of EVANOHM alloy R can be supplied at ±5 parts per million per °C from - 65 to + 125°C in fine sizes. Time effects on EVANOHM alloy R also are minimal compared with other resistance alloys. Standard precision resistors produced using EVANOHM alloy R display a maximum drift of 5 ppm per year for 15 years (for resistance from 1 ohm to 1 megohm); secondary standards display drifts from ± 6 to ±23 ppm per year over a 14 year period. Applications: EVANOHM alloy R has been used principally as round wire and ribbon for precision wound resistors. |
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