用DTA测定贵金属丝材的电阻-温度特性曲线

Determination for Resistance-Temperature Response of Precious Metals Wire by DTA

在差示热分析（ＤＴＡ）仪上安装１个高稳定度的直流电路，对ＤＴＡ的试样支架结构作相应改造，建成一套适合于测量贵金属细丝电阻－温度特性曲线的装置。该装置的工作温度范围为室温～１５００℃。对电位差的检测灵敏度为０１μＶ。用铂及其合金丝进行试验结果表明，新装置能够满足测量要求。

A high stable direct-current circuit is installed onto a differential thermal analysis(DTA) instrument,and the structure of the DTA sample holder has been modified.One set of equipment for measurement of resistance-temperature response of precious fine wire has been built.The working temperature range of this equipment is from room temperature to 1500℃.Its detective sensitivity of voltage is 0 1μV.The results of measurement for Pt and its alloys wires indicate that this equipment is able to satisfy the requirements of the measurement.