Tin-lead alloy and preparation process thereof

Abstract

The invention provides a tin-lead alloy and a preparation process thereof, and relates to the technical field of metal alloys. The process comprises the following steps that the following materials including, by weight, 2-5 parts of tin, 30-45 parts of lead and 40-60 parts of bismuth are selected by taking the temperature 106 DEG C-115 DEG C as an application temperature and taking a tin-lead binary phase diagram as the basis; the above raw materials into a smelting furnace, the smelting temperature is adjusted to 700 DEG C-800 DEG C for refining, and stirring and melting are conducted; the smelting temperature is adjusted to 300 DEG C-350 DEG C, stirring is conducted till all the materials are molten, surface layer drossing is removed, and metal hot melt is obtained after standing is conducted; the hot melt material is filtered, then the filtered hot melt material is put into a casting mold, and cooling is conducted to obtain a metal ingot; the metal ingot is machined into a standard sample size; and an alloy valve core sample is loaded into a hydrogen valve for melting point and pressure testing. The tin-lead alloy has high compressive strength, the temperature range of the melting point of the tin-lead alloy is small, a tin-lead alloy valve element can work for a long time under the pressure larger than 77 MPa, and the tin-lead alloy valve element cannot be broken or deformed when the instantaneous pressure reaches 87.5 MPa.

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