PREPARATION OF ALLOYS FOR GLASSY METAL PRODUCTION By: Dr. M. A. Meshkot Imperial College of Science, Technology and Medicine, London (1991) ABSTRACT Glassy metals are metallic materials with an amorphous structure. They can be produced by alloying transition metals with semi-metal (metalloid) elements and cooling from the melt at rates in excess of 1,000,000 C/s. Glassy metal alloys are commonly prepared by melting together elements in the required proportions or by diluting a mother alloy prepared in this way. The aim of this work has been to prepare glassy metal alloys (metallic glass) more efficiently and more economically by the reduction of metalloid oxides to their elements and dissolution of the metalloid into the melt by a single step process involving submerged powder injection. To achieve this aim three powder mixtures were used to investigate the preparation of Fe-B-Si alloys with boron and silicon components below 5%. The three powders being mixtures of silicon-carbide/boron-oxide, ferrosilicon / boron-oxide and aluminium/boron-oxide. For preliminary experiments to investigate the feasibility of the process and to obtain working parameters for injection experiments, an induction furnace with 300 cm3 charge capacity, a working temperature of 16OOC and controllable atmosphere was designed and built. For the injection of powders into molten iron, a simple high pressure batch type powder feeder capable of variable rate delivery to a depth of up to 0.5 m was designed and built. The said powders were plunged as 50 g packets and injected at carrier- gas flow rates of 10 and 20 1/min into 1.5-2 kg of molten iron at various depths. Source http://Ali.Meshkot.com