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本文介绍一种新型的高稳定性的镍基热电偶,它具有K型热电偶的主要优点,并基本克服了K型偶的两个主要缺点,即在300°～550℃间由于镍铬10合金的短程有序化引起热电势不稳定和在800℃以上由于合金发生择优氧化引起热电势不稳定。本文中将选定的新型镍热电偶正负极合金NiCr14.5Sil.5,NiSi4.5Mg0.1同K型偶的正负极合金NiCr10、NiSi2.5试样经不同的热处理,在中温进行升温,升降温和长期热稳定性对比试验表明:新型镍基热电偶在中温测量中,明显的优于K型热电偶。
This article describes a new type of high stability Ni-based thermocouple, which has the main advantages of K-type thermocouple and basically overcomes the two main disadvantages of K-type even between 300 ° ~ 550 ° C due to the nickel-chromium 10 The short-range ordering of the alloys results in an unstable thermoelectric potential and an unstable thermoelectric potential due to the preferential oxidation of the alloy above 800 ° C. In this paper, the selected Ni-Ni thermocouple positive and negative alloy NiCr14.5Sil.5, NiSi4.5Mg0.1 with K-type even positive and negative alloy NiCr10, NiSi2.5 samples by different heat treatment, warming at a temperature The comparison between long-term and long-term thermal stability shows that the new Ni-based thermocouple is better than the K-type thermocouple in the mid-temperature measurement.