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| 高温下Pt-13Rh/Pt热电偶的热电动势衰减机理研究 |
| Study on the Attenuation Mechanism of Thermocouple Electromotive Force of Pt-13Rh/Pt at High Temperature |
| 投稿时间：2019-12-24 |
| DOI： |
| 中文关键词: 金属材料 R型热电偶 高温 热电动势 衰减机理 |
| 英文关键词: metal materials type R thermocouple high temperature thermal EMF attenuation mechanism |
| 基金项目: |
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| 中文摘要: |
| 模拟1400℃富含Pt-Rh的使用环境，研究R型热电偶(Pt-13Rh/Pt)在高温下的衰减机理。分析竹节状缩颈现象的形成原因，讨论引起热电动势衰减的因素。结果表明，在富含气相Pt-Rh的高温环境下，热电偶外瓷珠表面沉积了固态的Pt、Rh，导致绝缘电阻的降低以及实际测温点向低温区转移，最终导致热电动势衰减。 |
| 英文摘要: |
| By simulating the operating environment of type R thermocouple (Pt-13Rh/Pt) with rich Pt-Rh gas phase at 1400°C, the attenuation mechanism of thermocouple at high temperature was studied. The causes of the bamboo-like necking phenomenon are analyzed and the factors induced the attenuation of thermal electromotive force (EMF) are discussed. The results showed that solid platinum and rhodium were deposited on the surface of the outer porcelain beads of the thermocouple in high temperature environment which was rich in gas phase platinum and rhodium. This leaded to a decrease in insulation resistance and a shift of the actual temperature measuring point to a lower temperature region, which ultimately resulted in the attenuation of EMF. |
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