微細中空ガラス球-石英-アルミナセメント系新磁器素地の開発

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New porcelain bodies, which exhibit lightweight and relatively high-strength, were fabricated using only nonplastic raw materials, such as glass microspheres, quartz and aluminous cement. Their mechanical properties were investigated. While the α-quartz and CaAl_4O_7 phases did not change with hydration time in the green body, the CaAl_2O_4 phase diminished and, finally, disappeared after 24h hydration. A new phase, CaAl_2 Si_2O_8. 4H_2O formed but only at hydration times between 24 and 48h, which exhibits maximum green strength. Green strength decreased slightly with increasing the content of glass microspheres at a constant aluminous cement content of 20 mass%. This decrease of green strength is attributed to the decreased bulk density and the relative decrease of aluminous cement volume, due to the larger volume of glass microspheres. The phases formed in the fired body were α-quartz, α-cristobalite, anorthite, glass and a small amount of α-Al_2O_3. The addition of larger amount of glass microspheres(60 mass%)led to large pores in the fired body, due to low viscosity of glassy phase during the firing process. However, the addition of a small amount of glass microspheres, such as 20 mass%, hampered vitrification and sintering in the fired body. The increased flexural strength at an intermediate composition containing 40 mass% glass microspheres was attributed to a strong prestress induced by the mismatch in thermal cxpansion coefficient between the glass matrix and the α-quartz grains during the cooling process. Fewer fracture origins, a smaller water absorption and a higher density due to the appropriate vitrification process were also indicated as potential factors leading to the strengthening effect.
社団法人日本セラミックス協会の論文
1999-01-01

微細中空ガラス球-石英-アルミナセメント系新磁器素地の開発

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