MATERIAL CONSISTING OF FE-PB AMORPHOUS COMPOUND AND PROCESS FOR PREPARING IT

摘要

PURPOSE:To obtain a stable material consisting of an Fe-Pb amorphous compd. by melting a mixture of iron oxide and lead oxide by heating and quenching the molten mixture with a superhigh quenching rate. CONSTITUTION:A mixture of starting materials having a proportion of composition expressed by the general formula (wherein 1.00>X>0.20) is melted by heating, and the molten mixture is quenched with a superhigh quenching rate. Said melting by heating is performed at a temp. higher than the temp. for causing satisfactory melting of starting materials, pref. at a temp. range by 50-200 deg.C higher than the melting temp. The heating during melting is usually performed in the air. Then, the melt of the starting materials is quenched with a superhigh quenching rate, usually at 10<4>-10<5> deg.C/sec cooling rate. Several methods for super quick cooling may be adopted in wide range so far as the required cooling rate is attainable. A representative example of the methods is to solidify the melt maintaining the same atomic arrangement as that in the liquid state by ejecting the melt of the mixture of starting material onto the surface of a roll rotating at high rotational speed.