| 摘要 |
PURPOSE:To mass-produce the title uniform and paticulate powder in a short time by charging a mixture of metallic powder and carbon powder into a rotatable carbon furnace core tube, and high-frequency induction heating the mixture in a nonoxidizing atmosphere while heating the tube. CONSTITUTION:A high-frequency coil 3 is provided in a treating furnace 5 to surround a large-bore part 11, an opening and closing lid 52 of the furnace 5 is opened, the mixture A of the metallic powder of Si, Al, etc., and carbon powder and carbon balls 2 are charged in the carbon furnace core tube 1 which is made rotatable by driving rollers 4 and 4 from a material charge port 51, the lid 52 is closed, then the opening and closing valve 73 of a deaeration pipe 63 is opened, the furnace is deaerated by a vacuum pump 83, and the valve 73 is closed. The opening and closing valve 71 of an inlet pipe 61 is then opened to introduce an inert gas into the furnace core tube 1, and the opening and closing valve 72 of a discharge pipe 62 is controlled so as to keep the internal pressure of the furnace core tube 1 to about 1kg/cm<2>. A high-frequency electric current is passed through the coil 3 to heat the furnace core tube 1 to 1,200-1,700 deg.C, the rollers 4 are operated to rotate the furnace core tube 1, and the mixture is heat-treated for 3-10hr. |
