アナターゼ型酸化チタンのマイクロ波加熱による急速昇温焼結 Rapid-Rate Sintering of Anatase-Type TiO_2 by Microwave Heating
A Ti_2 powder compact was exposed to 2.45 GHz microwave (0.1-0.8 kW) for 0.5-60 min and the response of TiO_2 was examined by measuring the surface temperature of the specimen. Anatase-type TiO_2 was heated up to 950℃ but rutile-type TiO_2 was not heated. At a constant power output the temperature of anatase-type TiO_2 was higher for larger specimens, and at a constant specimen weight the temperature of the specimen was higher at higher power output. The grain size was larger in the bulk than near the compact surface. The transformation of anatase-type TiO_2 to rutile-type TiO_2 also proceeded more extensively in the bulk than near the surface. These differences were ascribed to the temperature difference caused by the small penetration depth of microwave in this oxide.