Proceedings of the Materials Research Society of Korea Conference (한국재료학회:학술대회논문집)
- 2009.05a
- /
- Pages.3.1-3.1
- /
- 2009
Fabrication Methods of Porous Ceramics and Their Applications in Advanced Engineering - Large Flat Precision Plate for Flat Display Industries
- Matsumaru, Koji (Nagaoka University of Technology) ;
- Ishizaki, Kozo (Nagaoka University of Technology)
- Published : 2009.05.21
Abstract
Normal sintering process of producing porous ceramics is not to sinter perfectly, i.e., stop sintering in middle-process. Our porous ceramic materials are a product of complete sintering. For example if one want to make a porous carborundum, raw carborundum powder is sintered at either lower temperatures than normal sintering temperature or shorter sintering periods than normal sintering time to obtain incompletely sintered materials, i.e., porous carborundum. This implies normally sintered porous ceramic materials can mot be used in high vacuum conditions due to dust coming out from uncompleted sintering. We could produce completely sintered porous ceramic materials. For example, we can produce porous carborundum material by using carborundum particles bonded by glassy material. The properties of this material are similar to carborundum. We could make quasi-zero thermal expansion porous material by using carborundum and particles of negative thermal expansion materials bonded by the glassy material. We apply to sinter them also by microwave to sinter quickly. We also use HIP process to introduce closed pores. We could sinter them in large size to produce