PREPARATION METHOD OF AL-ZR-C MASTER ALLOY

摘要

Disclosed is a preparation method of Al-Zr-C master alloy which comprises 0.01-10% Zr, 0.01%-0.3% C and balance Al. The method includes the following steps: (1) preparing materials of commercially pure Al, Zr metal and graphite according to the composition of the alloy, wherein the graphite is graphite powder with an average particle diameter of 0.074 mm-1 mm and is treated as follows: soaking the graphite powder in an aqueous solution of KF, NaF, K2ZrF6, K2TiF6 or a mixture thereof for 12-72 h; then separating the graphite powder by filtration or centrifugation; and drying the soaked graphite powder at a temperature of 80-200? for 12-24 h; (2) melting the commercially pure Al and keeping the temperature at700-900?, then adding the prepared Zr and the treated graphite powder into the liquid melt of Al to melt the Zr and the graphite powder so as to obtain an alloy liquid; (3) stirring and keeping the temperature, then cast moulding the alloy at 700-900?. The Al-Zr-C master alloy obtained by this method has low cost and high quality.