Bending Strength of Al_2O_3 Ceramics for Textiles Machinery and Elastic Wave Characteristics by Wavelet Analysis

摘要

The optimized conditions of pressureless sintering were investigated in order to obtain the bending strength and the elastic wave signal of Al_2O_3 composite ceramics for textiles machinery. As sintering conditions, a temperature range from 1400℃ to 1700℃ and time from 30 minutes to 150 minutes were applied. Three-point bending tests were conducted on the sintered materials to obtain the strength property. From the test results, the optimum sintering condition was 1600℃, 100 minutes. Al_2O_3 composite ceramics showed that the elastic wave signal characteristics had a regular correlativity between the optimum sintering temperature and time as well as the maximum bending strength.