How Does Temperature Non-uniformity of an Annealing Furnace Affect SPRT Stability?

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How Does Temperature Non-uniformity of an Annealing Furnace Affect SPRT Stability? (88.14 KB)

A series of investigations to determine how temperature non-uniformity of the annealing furnace affects SPRT stability was recently performed. Three stable SPRTs were annealed in furnaces with different temperature uniformity profiles: ±1°C, ±3°C, and ±8°C. Resistances of the SPRTs at the triple point of water (Rtpw) were measured and compared before and after annealing. In this paper, the method of investigation and test equipment used will be presented, and the test results will be reported. Based on the test results, the influence of the annealing furnace tempera-ture non-uniformity on SPRT stability will be discussed.