石灰焼結体の曲げ強さと耐水和性に純度および焼成条件が与える影響 : (<小特集>セラミック材料小特集)

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Natural lime containing 1.45 wt% impurities produced from limestone and high-purity lime (99.9%) produced from calcium carbonate were used as the raw materials for the present study. These limes were molded into a circular disk or a plate by cold isostatic pressing (CIP) or uni-axial dust pressing, and then fired at 1800℃. Strength measurements by three-point bending test, estimation of the Weibull parameter and hydration test were carried out on the fired bodies. The following results were obtained : (1) The mean bending strength for the bodies made of natural lime was from 74 to 86 MPa, while for the bodies made of high-purity lime the mean strength was 135 MPa. (2) The Weibull parameter evaluated for the natural lime bodies was from 11 to 13, while for the high-purity lime bodies the parameter was 17. It was found that the high-purity lime body was more uniform in microstructure than the natural lime body. As for the natural lime bodies, the Weibull parameter of the samples obtained from the CIP-molded green body was higher than that of the samples from the uni-axially pressed green body. (3) The weight gain of the high-purity lime body under a saturated water vapor pressure at 8'C was less than 3 wt% after two months, while the natural lime body showed as much as 3 wt% of gain only after two weeks under the same testing condition. This result showed clearly that hydration resistance of the high-purity lime body was much higher than that of the natural lime body.
社団法人日本材料学会の論文
1990-03-15

石灰焼結体の曲げ強さと耐水和性に純度および焼成条件が与える影響 : (<小特集>セラミック材料小特集)

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