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一、前言 NiCr-NiAl(K型热电偶)热电势高,线性好,价格便宜,所以在0～1200℃的测温范围,对测温精度要求不是特别苛刻的地方均采用K型热电偶。但是NiCr-NiAl热电偶存在严重的缺点,即热稳定性差,在空气中1250℃高温下,使用50小时后记录到10℃的分度漂移。造成这种误差的机理有不少人进行了研究。Burley和Ackland指出,Ni基热电偶合金当在空气中加热时显示出其温度—热电势特性逐渐的和积
First, the preface NiCr-NiAl (K type thermocouple) high thermoelectric power, good linearity, cheap, so in the 0 ~ 1200 ℃ temperature measurement range, the temperature measurement accuracy is not particularly demanding places are used K-type thermocouple. However, NiCr-NiAl thermocouple has serious drawbacks, namely poor thermal stability, the use of air in the high temperature of 1250 ℃, 50 hours after the record to 10 ° C graduation drift. Many people have done research on the mechanism of this kind of error. Burley and Ackland pointed out that the Ni-based thermocouple alloys show a gradual sum-product of their temperature-thermopower behavior when heated in air