| 摘要 |
PURPOSE:To prevent the thermal contraction from a cut end face and to calcine a product without causing waviness by forming a layer of underlying power consisting of a high-melting-point ceramic on the surface of a carbon sheet with carbon fiber as the skeleton smoothed with carbon powder. CONSTITUTION:Fine carbon powder 4 is applied on the surface of a carbon sheet 1 obtained by forming the carbon fiber having about 20mu diameter into a sheet with an epoxy binder by the wet process to smooth the surface of the sheet 1. The layer 2 of the underlying powder consisting of a high-melting- point ceramic bonded by a binder 3 is provided on one or both sides of the sheet 1. The calcining sheet is interposed between a substrate and a ceramic product or between the ceramic products, when the ceramic product such as an alumina substrate is calcined. The sheet 1 is burned down by calcination, and the powder 2 remains as such. However, the sheet 1 is not contracted with the carbon fiber as the skeleton, the sheet 1 is not contracted from the cut end face even when the sheet 1 is cut and used, and the surface of the sheet 1 is extremely smooth. |
