Abstract: A formed body prepared by compacting tungsten powders is embedded in a powder mixture capable of performing combustion synthesis, a part of the powder mixture is powerfully heated to ignite the part and perform combustion synthesis, by the heat of formation released, a temperature of a formed body is instantaneously elevated to induce a sintering reaction, and a high temperature state is retained to convert a whole of the formed body into sintered tungsten.

Abstract: W powders and C powders are mixed at a ratio of 1:1, the raw material mixed powder is compacted to prepare a formed body, the formed body is embedded into a powder mixture capable of performing combustion synthesis, a part of the powder mixture is powerfully heated to ignite the part and perform combustion synthesis, and according to heat of formation released, a reaction represented by W+C?WC is induced and the reaction is subjected to combustion synthesis to convert a whole of the formed body into sintered WC.

Abstract: A formed body prepared by compacting tungsten powders is embedded in a powder mixture capable of performing combustion synthesis, a part of the powder mixture is powerfully heated to ignite the part and perform combustion synthesis, by the heat of formation released, a temperature of a formed body is instantaneously elevated to induce a sintering reaction, and a high temperature state is retained to convert a whole of the formed body into sintered tungsten.

Abstract: W powders and C powders are mixed at a ratio of 1:1, the raw material mixed powder is compacted to prepare a formed body, the formed body is embedded into a powder mixture capable of performing combustion synthesis, a part of the powder mixture is powerfully heated to ignite the part and perform combustion synthesis, and according to heat of formation released, a reaction represented by W+C→WC is induced and the reaction is subjected to combustion synthesis to convert a whole of the formed body into sintered WC.

Abstract: A conductive wire is electrically heated in a gas atmosphere, wherein a gas reacts with a constituent material of the conductive wire, under gravity-free or micro gravity state. A ceramic is formed on a surface of the wire sa an outer core through a reaction between the wire and the gas and is left by caving an inside wire by melting while maintaining controlled gas convection.

Abstract: A method for extruding a billet made of brittle metals, alloys, intermetallic compounds, ferrites or ceramics, which comprises embedding the billet in a solid pressure transmitting medium having a configuration and a dimension fitting to those of the inner space of a container of an extruder and being capable of plastic deformation by the actuating pressure of a compressing plunger of the extruder, loading the billet in the container of the extruder, pressurizing the pressure transmitting medium by the compressing plunger, and extruding the billet by actuating the extrusion plunger while the pressure is being maintained.