| 摘要 |
PURPOSE:To provide a titled device which improves electric power efficiency and yields various hard alloys such as hard crystals having prescribed performances by enclosing a cylindrical body which has heat resistance and thermal conductivity and is to be inserted therein with powder of a raw material mixture with a heat insulating material and a reinforcing material, and providing a pair of electrodes at both ends of the cylindrical body. CONSTITUTION:A green compact mixture 4 for a hard alloy is packed in a cylindrical body 1 having heat resistance and thermal conductivity. A heat insulating material 5A and a reinforcing material 5B having heat resistance are provided coaxially to the body 1. A pair of electrodes 2, 3 and conducting plates 6, 7 are provided at the top and bottom of the cylindrical body (furnace body) 1 so as not to contact with the material 5B. Heating current is flowed concentrically among the plate 6-the electrode 2-the body 1-the electrode 3-the plate 7 so that the mixture 4 is subjected to a heating and synthesizing treatment. When the synthesis of the hard alloy of the composite body advances and a liquid phase state is generated, the condition of conducting electricity is controlled according to the intended alloy. This device is adaptable for synthesizing and producing abrasive grains of an SiC-B4C alloy. |
