熱分解による焼入油の老化 : 焼入油の老化について V

概要

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In N_2 atmosphere, a Ni-Cr wire coil which was resistance-heated to about 900℃ is repeatedly, and quenched into the quenching oils every 60s.. The heating coil of 30mm dia., and 40mm length was made of a 3.2mm dia., 800mm long Ni-Cr wire. This testing apparatus was newly deviced and built in oder to carry this experiment efficiently and reasonably in the condition nearest to the practical hardening operation. The examined oils were (1) pure mineral oil (2) fatty oil and (3) mineral oil added with 10% polymerized heavy hydrocarbon to increase the cooling ability. The quenching oil bath contained 2l of oil to be examined, which was circulated at the rate of 10l/mn. through the cooling system and the oil temperature was held at about 30℃. After the repeated quenching tests of 4, 6, 10, 20, 30, 60 and 90h, the properties of oils were determined. As the conclusion, through the all kinds of oils examined, concerning to the cooling ability of quenching oil, the deterioration was remarkably less than that by oxidation and polymerization previously reported by the author but the lowering of the flash point was characteristically remarkable.
社団法人日本鉄鋼協会の論文
1960-04-01