Fe-Cr, Fe-NiおよびFe-Ni-Co封着合金の熱膨張係数について

概要

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The influence of composition upon the coefficients of thermal expansion of Fe-Ni-Co, Fe-Cr and Fe-Ni sealing alloys was investigated.The results obtained are as follows:(1) The average coefficient of thermal expansion of 13∼28% Cr-Fe alloys gradually decreases as Cr amount increases and the decreasing rate around 17%Cr and 27%Cr is less than 0.20×10-6 per Cr 1%.(2) The change of average coefficient of thermal expansion of Fe-Ni alloys around 42%Ni increases as much as 0.5×10-6 per Ni 1% in the case of 30∼300°C.(3) The average coefficient of thermal expansion around 52%Ni shows a monotonous increase for Ni content in any temperature range up to 650°C and it is about 0.4×10-6 Ni 1%.(4) The influence of C upon the average coefficient of thermal expansion of 29Ni-17Co-Fe practical alloy can almost be ignored as the composition change is actually extremely small, but the influence of Si and Mn shows such values that cannot be ignored.(5) The average coefficient of thermal expansion around 29Ni-17Co-Fe alloy composition rises according to the increase of Ni and Co. And the increasing rate is 0.5×10-6 (30∼400°C) and 0.3×10-6 (30∼450°C) per Ni 1% and 0.3×10-6 (30∼400°C) and 0.1×10-6 (30∼450°C) per Co 1% respectively.
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