To provide a method and an apparatus for manufacturing a boron nitride ceramic sintered compact having small difference of the density between the inside part and the surface part, high density, high strength and dense structure to hardly causing crack.
A molding 10 of boron carbide powder is housed in a boron nitride (BN)-made case 12, the BN-made case is enclosed by an outside heat insulation wall 14 comprising an alumina fiber board and BN powder 16 is filled in a space between the BN-made case and the outside heat insulation wall to perform heat insulation. The material 20 to be heated is heated at 5-30°C/minute temperature rising rate by being irradiated with electromagnetic wave having 10-100 GHz oscillation frequency from a millimeter wave gyrotron and is sintered by keeping top temperature of 2,100-2,250°C for 0.1-3 hr.
KOTO SEITARO
SAJI TASABUROU
SEIGETSU HISANORI
NISHI YUJI
ISHIBASHI JUNICHI
KITANO AKIHIRO
UNIV FUKUI