Al_2O_3-SiO_2系ガラスファイバーの結晶化と結晶化に及ぼすZrO_2あるいはCr_2O_3添加の影響

概要

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Crystallization of Al_2O_3-SiO_2 glass fiber (AS) and the effect of ZrO_2 and Cr_2O_3 addition on the crystallization were investigated by DTA, XRD and density measurement. Mullite crystallized in the AS at 995℃. The mullite crystal grew and its amount increased with rising temperature. Cristobalite crystallized in the AS at 1450℃ and above. Mullite crystallized at 1015℃ with t-ZrO_2 and spinel phase in fibrous glass containing ZrO_2 (ASZ). The mullite crystal grew and its amount increased with rising temperature. At 1500℃, cristobalite crystallized and the t-ZrO_2 partly transformed into m-ZrO_2. The amount of cristobalite in this fibers was larger than that in the AS. Only spinel phase crystallized at 990℃ in fibrous glass containing Cr_2O_3 (ASC). The amount of spinel phase increased up to 1100℃, but slightly decreased at 1200℃ and disappeared at 1300℃. Mullite appeared from 1100℃ and increased with rising temperature. Cr_2O_3 dissolved in the mullite and suppressed the crystallization rate and grain growth. The addition of Cr_2O_3 raised the temperature at which the amount of mullite reached the calculated value by 105℃ compared to that of the AS. Although the amount was smaller than that of the AS, cristobalite also crystallized in the ASC by firing at 1500℃.
社団法人日本セラミックス協会の論文
1996-04-01