一、概述贵金属精密电阻合金主要用作高稳定性精密绕阻电位计和电附器。电位计是一种将机械位移量变换成电量的传感器,广泛用于飞机、导弹、舰船、解算装置、雷达及其它遥测和控制系统中,各种结构的电位计中应用最广的是线绕电位计。随着现代技术飞速发展,对线缆电位计提出越来越高的要求,出现了特性精度高达±0.02—0.01％的特高精度线绕电位计,其分辨率高达0.01—0.005％,其线匝数环形电位计为10000—20000,条形电位计为15000—30000,它们应用于计算并装在仪器与自动器的最重要的部件中。精密线绕电位计对制作绕阻用电阻线提出一系列严格要求:稳定且高的电阻率ρ(一般在10～150μΩ·cm范围内);低的电阻温度系数α;高的耐磨性以及抗腐蚀性;低而稳定的接触电阻R_c;低的噪音电平;低的对铜热电势Ecu(在直流装置中尤为重要);高的抗拉强 First, an overview Precious metal precision resistance alloy is mainly used for high stability precision winding potentiometer and electrical attachment. Potentiometer is a kind of mechanical displacement sensor into electricity, widely used in aircraft, missiles, ships, solvers, radar and other telemetry and control systems, potentiometers of various structures is the most widely used Wirewound potentiometer. With the rapid development of modern technology, the cable potentiometer has been put forward higher and higher requirements. A special high-precision wirewound potentiometer with characteristic accuracy of up to ± 0.02-0.01% has emerged with a resolution of 0.01-0.005% Toroidal ring potentiometers 10,000-20000, bar potentiometers for the 15000-30000, they are used in computing and installed in the most important parts of the instrument and the robot. Precision Wirewound Potentiometers make a series of stringent requirements for making resistive windings for winding: stable and high resistivity ρ (typically in the range of 10-150μΩ · cm); low temperature coefficient of resistance α; high wear resistance and Corrosion resistance; low and stable contact resistance R_c; low noise level; low copper thermoelectric potential Ecu (especially important in DC devices); high tensile strength