CARBONACEOUS HOLLOW MOLDED ARTICLE AND FABRICATION METHOD THEREOF

Abstract

Disclosed is a seamless central diameter expanded hollow molded articles made only of glasslike carbon. A fabrication method of the seamless carbonaceous hollow molded article having an expanded core includes: a cast-molding process, in which a liquid thermosetting resin is poured into a cavity formed between a core and an outer body made of a thermally fusible (or hot meltable) material, and a seamless thermosetting resin molded article having an expanded core is formed in hollow shape; a core flowing out process, in which the thermally fusible material of the cast molded core melts by heating and flows out; and a carbonization process, in which the thermosetting resin molded article is carbonized.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

The above aspects and features of the present invention will be more apparent by describing certain embodiments of the present invention with reference to the accompanying drawings, in which:

FIG. 1 is a flow chart explaining a fabrication method of the present invention; and

FIG. 2 is an explanatory cross-sectional view showing an example of a spacer and arrangement thereof in accordance with a preferred embodiment of the present invention.

Claims

1. A carbonaceous hollow molded article that is made only of glasslike carbon and having a hollow shape with an expanded central diameter without seams.

2. A fabrication method of the hollow molded article of claim 1, the method comprising: a cast-molding process for pouring a liquid thermosetting resin into a cavity formed between an outer body and a core made of a thermally fusible (or hot meltable) material, and obtaining a seamless, hollow thermosetting resin molded article having an expanded central diameter;a core flowing out process, for heating, after the cast-molding process, the thermally fusible material of the cast molded core to make the core melt and flow out; anda carbonization process for carbonizing the obtained thermosetting resin molded article.

3. The method according to claim 2, wherein a thermally fusible material having a softening point not lower than 70° C. and not higher than 20° C. is used as the core material.

4. The method according to claim 2, wherein, in the cast-molding process, a spacer used to secure the position of the core on the inside of the outer body is made of a thermosetting resin of the same quality as said liquid thermosetting resin, and carbonization is performed with the spacer being incorporated with the cast molded article.

5. The method according to claim 3, wherein, in the cast-molding process, a spacer used to secure the position of the core on the inside of the outer body is preferably made of a thermosetting resin of the same quality as said liquid thermosetting resin, and carbonization is performed with the spacer being incorporated with the cast molded article.