采用Fe－Al－Mn－O系热敏材料的温度报警铠装热敏电缆的研制  

Development of the Sheathed Thermistor Cables of Fe-Al-Mn-Osystem for Temperature Detection

作　　者：张忠模[1] 雷霆[1] 何明[1] 刘碧君 

机构地区：[1]重庆仪表材料研究所

出　　处：《功能材料》1994年第6期545-550,共6页Journal of Functional Materials

摘　　要：采用Ｆｅ－Ａｌ－Ｍｎ－Ｏ系热敏材料制备了用于大面积温度监测的铠装热敏电缆。其结构为：最外层为铠装金属管，金属管内为半导体的热敏材料，两根平行于金属管的电极丝埋在热敏材料中。所制得的铠装热敏电缆元件（每根６米长）在１００℃～３５０℃时的电阻值在１０￣１～１０￣５Ω范围内，材料常数Ｂ在４０００～６０００Ｋ，能够满足实用要求。该铠装热敏电缆具有良好的稳定性。在７２０ｈ３５０℃老化中，每隔７２ｈ测得的电阻值的最大变化为３．０％；在１００℃～３５０℃热循环中，电阻值变化在０．１～７．９％范围，对应的温度测量偏差为０．１～３．１℃。还对铠装热敏电缆沿长度方向的均匀性问题进行了探讨。The sheathed thermistor cable of Fe-Al-Mn-O system semiconductive materials havingnegative temperature coefficients was developed bythe process of the sheathed thermocouple.A metallicsheath surrounds a mass of compacted Fe-Al-Mn-Osystem ceramic semiconductive materials,two spacedwires(pure Ni)are embeded within thesemiconductive materials as the conductors. Theresistances of the Sheathed Thermistor cables at 6mlength vary in the range of about 10～10￣5Ω at 100～350℃,the material constant B is within 4000～6000K.This sheathed thermistor cables have a goodstableness and a minor aging effect.The resistancechanges which were measured every 72h during theagings of 720h at 350℃ are less than 1.0%～3.0%.The resistance changes after thermal cycling from100～350℃ is within 0.4～7.9%, the temperatureerrors corresponding to resistance changes are 0.1～3.1℃.The sheathed thermistor cables of the presentstudy can be applied to the large-area temperaturedetection at the temperature of 100～350℃.

关 键 词：热工测量 热敏电阻 热敏电缆 研制 铠装 AL2O3 

分 类 号：TM246.205[一般工业技术—材料科学与工程] TH810.4[电气工程—电工理论与新技术]