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And when comparing the expansion rates of B with that of C, we may assume that the linear expansion was reduced due to the reduction CA6, which
may be attributed to the increase in microsilica contents in the ASM. Fig. 4 presents the HMOR measured after keeping the specimen at 1400¡æ for
an hour. The specimen A containing spinel shows the highest mechanical strength, whereas the specimen B, C and D containing magnesia show lower
mechanical strength. This indicates the existence of the liquid phases in matrix, which was caused by the addition of microsilica to ASM and AM. With
increase in microsilica content, amount of liquid phases and its viscosity of microsilica change in accordance with the change in temperature. Thus, it may
become a factor to reduce the value of HMOR at high temperature5).

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