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利用超声无损表征原理对烧成温度分别为1230℃、1260℃及1290℃的铝质瓷坯料样品进行了测试分析,讨论其组织状态随温度的变化情况。研究表明,与1230℃和1290℃的样品相比,超声波在1260℃的样品中声衰减系数较小、主频偏移小。分析认为,在陶瓷材料的组织成分稳定的情况下,声衰减系数的变化主要受孔隙率的影响,并随着孔隙率的增大,声衰减增大。SEM观察结果与超声分析结果相符合,说明超声回波功率谱分析用于铝质瓷材料的表征与评价是可行的。
The ultrasonic nondestructive characterization principle was used to test and analyze the aluminum billet samples with the sintering temperature of 1230 ℃, 1260 ℃ and 1290 ℃, respectively. The changes of their microstructures with the temperature were discussed. The results show that compared with the samples at 1230 ℃ and 1290 ℃, the acoustic attenuation coefficient of ultrasonic at 1260 ℃ is small and the frequency offset is small. The analysis shows that the change of sound attenuation coefficient is mainly affected by the porosity in the case of stable ceramic tissue composition, and the sound attenuation increases with the increase of porosity. The results of SEM are consistent with those of ultrasonic analysis. It is feasible to use ultrasonic echo power spectrum analysis to characterize and evaluate aluminum porcelain materials.