作者：张立新1，肖翔1，陈洁1，唐青松2，任侃2
单位：1. 重庆材料研究院有限公司，重庆 400770；
      2. 苏州长风航空电子有限公司，江苏苏州 215011
中图分类号：TH811               
文献标识码：A               
文章编号：1006-883X(2020)08-0027-04
收稿日期：2020-05-28

摘要：重材院为航空领域研制的双支式PtRh20外套管铠装R型热电偶，开展材料匹配、工艺控制研究。选用热膨胀系数匹配、力学性能相近的材料作为外套管，制订并优化制造工艺，减少对偶丝污染，确保精度和稳定性。并对贵金属套管铠装热电偶的结构尺寸、使用温度、分度、长期稳定性、高温绝缘电阻、绝缘材料压实密度等性能进行了验证。使用温度达到1500℃，精度达到±0.25%t，各项性能满足研制要求。克服了高温合金外管贵金属铠装热电偶稳定性差，使用温度受限的不足，稳定性优于装配式贵金属热电偶指标要求。
关键词：贵金属套管；铠装热电偶；稳定性。

The Research of Mineral-Insulated Noble Metal-Sheathed Thermocouple Used in Aircraft
ZHANG Li-xin1, XIAO Xiang1, CHEN Jie1, TANG Qing- song2, REN Kan2
1. Chongqing Materials Research Institute Co., Ltd., Chongqing 400770, China; 2. AVIC SUZHOU CHANGFENG AVIONICS Co., Ltd., Suzhou 215011, China
Abstract: The property of type R PtRh20 sheathed thermocouples was investigated for using in the aviation fields. The compatibility, such as coefficient of thermal expansion, mechanical property of between the thermoelements and the sheath alloy, processing technology of the thermocouples were discussed. The calibration, stability, high temperature insulation resistance and compaction density properties of the PtRh20 sheathed thermocouples were tested and verified. The using temperature of the PtRh20 sheathed thermocouples were up to 1500℃ with an accuracy of ±0.25%t and the stability were better than that of assembled noble metal thermocouples that meet the technology requirements. The integrity property of the PtRh20 sheathed thermocouples were better than that of superalloy sheathed thermocouples.
Key words: noble metal-sheathed; thermocouple; stability

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备注：2020年 第26卷 第08期