Thermoelectric Effects of Cold Work in Pt/10%Rh and Pt/13%Rh Versus Pt Thermocouples

Autor:	T L Morgan, R E Bentley
Rok vydání:	1984
Předmět:	Work (thermodynamics) Materials science chemistry Thermocouple Seebeck coefficient Thermoelectric effect General Engineering Analytical chemistry Thermodynamics chemistry.chemical_element Platinum Rhodium
Zdroj:	Metrologia. 20:61-66
ISSN:	1681-7575 0026-1394
Popis:	We have investigated the consequences of cold work introduced in handling PtRh versus Pt thermocouples and found changes in the Seebeck coefficient of up to -40 nV/°C and errors in calibration of up to -0.4%. We show that above 200 °C recovery in the Seebeck coefficient towards its pre-cold-worked value occurred at an increasing rate with temperature but that in the PtRh leg, unlike the Pt leg, the recovery was not complete. A residual effect, attributed to PtRh, of up to -4 μV remained in thermocouple emf after recovery anneals had been applied. Recommendations are made for the handling of high-quality Pt-based thermocouples.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::4211e3f4a3ff1837a0c6f90464816960 https://doi.org/10.1088/0026-1394/20/2/005 Zobrazit plný text záznamu