合金の凝固の際に共存する固相と液相の容積および比重の変化 : Cu-Pb系合金に関する基礎的研究
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概要
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In this treatise I have clarified the conditions of the change of specific gravity during solidification as well as that of shrinkage of volume by calculating theoretically based on the mixture ratio the change of the volumes and the specific gravities of both the solid and the liquid phases caused by the solidification of Cu-Pb system alloys The result of the calculation shows that the most outstanding liquid shrinkage is a monotectic reaction at 954°C, at which it shrinks 98% isothermally The volume of the liquid is 4 2% less than that of the solid immediately before the monotectic reaction, but upon consummation of the said reaction, no less than 13 6% smaller than that of the latter It is, therefore, considered that this conspicuous change has a grave relation with the producing of a shrinkage cavity in the casting of Cu-Pb system alloys Furthermore, in the solidification of Pb at 327°C a little bit of isothermal shrinkage produces, too In regard to the relation between Pb content and the alloy's shrinkage percentage, my investigation indicates that in the monotectic reaction at 954°C 36% Pb or its neighborhood is the maximum of 1 5%, and in the total solidification range a minimum of 2 8% exists at 30% Pb or its neighborhood, and that the rest continuously increase in accordance with Pb content It is supposed that this has a great significance as a desirable Pb content Next, in the change of the specific gravity, the maximum is also a monotectic reaction at 954°C, and the change of the specific gravity of the liquid itself is 109%, which becomes approximately 44% greater than that of the solid immediately before the reaction, and no less than 158% larger than that of the latter directly after it It must be added here that there exists a specific gravity difference in two conjugating liquids between 36% Pb and 869% Pb In this case, the liquid on the part of Pb is greater than that of Cu by 0〜10 9% Judging from the above-mentioned, relation between the changes of the volume and the specific gravity, and the temperature, this alloy passes through a complicated process, in which we can perceive a difficulty in the casting of this alloy
- 園田学園女子大学の論文
- 1976-01-08