| 摘要 |
1. Process for the preparation of a ternary or quaternary polycrystalline alloy for producing monocrystals by passing in per se known manner into a solvent zone, the components of the alloy being placed in a desired proportion in a thin-walled ampoule placed in an enclosure filled with a gas at high pressure and equipped with fast heating and cooling means, means for measuring the temperature being positioned in the vicinity of the components to be treated, the compound of desired composition is completely melted by heating to a temperature above its melting point and for a time sufficient for the homogenization of the liquid, followed by a progressive, isothermic cooling of said liquid by bringing it to a temperature below its melting point and monitoring, with the aid of a temperature measuring means, the sudden rise thereof indicating the end of the superfusion of the liquid, followed by a sudden tempering of the mixture bringing about the instantaneous solidification in the form of a homogenous polycrystalline ingot. |
