燒入冷却劑の研究

概要

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An eutectoid steel cylinder, on the surface of which hot-junction of thermo-couple was welded, was heated to 780℃ and quenched into various kind of quenching liquid. Then the cooling curves were recorded by the oscillograph to indicate changing of thermo-electromotive force. The results were as follows, (1) Numerous kinds of substances were added to water but any coolant could not be obtained which had a cooling ability similar to oil excepting waterglass solution. (2) Aqueous solutions of non-volatile substances showed very severe cooling ability and useful for the drastic quenching. (3) Aqueous colloidal solutions were not inflammable and their cooling power could be changed at will according to the concentration, then probably might be used in any particular quenching operation. (4) Concerning oils both mineral and fatty, the heavier or the larger was its molecular weight, the better proved its cooling ability. Fatty oil was more excellent in cooling ability than mineral oil. But even in fatty oil the cooling ability was not excellent if its acid value was high.