CaO-Al_2O_3-SiO_2系磁器の低温焼結

概要

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Effect of addition of borosilicate glass, quartz and feldspar powders on the sintering characteristics of kaolin and CaCO_3 mixtures was investigated in order to obtain low-temperature sinterable porcelain bodies below 1000℃. Upon heating, CaO reacted with decomposed kaolin at temperatures 800-850℃, and formed metastable amorphous materials. Transiently formed active amorphous materials sintered rapidly between 850℃ and 950℃ by the viscous flow mechanism to generate glass-like dense ceramics. HOwever these materials had the disadvantage of large shrinkage and thermal deformation prior to crystallization. Addition of borosilicate glass powders decreased the difference in temperature between sintering and crystallization, which improved thermal deformation characteristics of the fired specimens. Addition of quartz powders up to 25 mass% yielded dense porcelain bodies consisting of anorthite, wollastonite, gehlenite and quartz crystals. Also, a lower shrinkage and a lower thermal deformation were attained by quartz addition. On the other hand, addition of feldspar powders inhibited the densification of the body, since its addition considerably lowered the crystallization temperature of anorthite below 850℃.
社団法人日本セラミックス協会の論文
2000-03-01