Computer Science
Scientific paper
Mar 1925
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1925natur.115..382e&link_type=abstract
Nature, Volume 115, Issue 2889, pp. 382 (1925).
Computer Science
Scientific paper
AN investigation into the influence of pouring temperatures and mould temperatures on the microstructure of a lead-base bearing metal of the following percentage composition (lead, 82.5; antimony, 11.0; tin, 5.5; copper, 1.0) has shown that it is possible for the antimony to unite either with the tin, to form cubes of the compound SnSb, or with the copper, to form needles of the compound Cu2Sb (Regulus of Venus). Three different pouring temperatures have been employed in this investigation-500° C., 400° C. and 300° C. It has been found that chill castings poured at the higher temperatures-500° C. and 400° C.-contain but slight traces of the tin-antimony compound, whereas chill castings poured at 300° C. contain but few of the purple needles of the copper-antimony compound. If a chill casting containing the tin-antimony compound (that is, one poured originally at 300° C.) be melted and poured at 500° C., the tin-antimony cubes are almost completely replaced by copper-antimony needles. If, however, a chill casting containing the copper-antimony compound (that is, one poured originally at 500° C.) be melted and poured immediately on arrival at 300° C., the copper-antimony needles persist. That the copper-antimony needles may, however, be replaced by tin-antimony cubes is shown by the fact that when a sample of the alloy is heated to 500° C. and allowed to cool slowly to 300° C. before pouring, cubes of tin-antimony compound are found in the chill casting produced.
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