中文摘要：
	本研究針對氧化鋁陶瓷之條狀試片，以四點彎曲強度測試為依據，配合非破壞性量測法，探討其受熱衝擊與循環熱衝擊試驗後之行為，對材料機械性質劣化的程度，做深入的了解。 從熱衝擊試驗中，染色探傷與殘留強度測試結果，可以熱彈力學與尺寸因子配合能量法，解釋材料受熱衝擊破壞之行為。而循環熱衝擊試驗裡，由於本研究所施行之循環熱衝擊溫差DT，低於材料之臨界溫差DTc，從殘留強度測試結果，在所觀察的循環數內，並無發現材料有熱疲勞現象，與非破壞性量測結果，包括染色探傷法、超音波及應變規量測材料彈性係數，維氏硬度測試與壓痕預裂之裂縫成長，皆有相同的趨勢。 最後以強度測試結果為依據，評估各式非破壞性量測法之優缺，對未來之研究，提供一較佳之選擇。
Abstract：
	Degradation in mechanical properties of a polycrystalline alumina subjected to thermal shock loading was studied via residual flexure strength measurement and several nondestructive evaluation methods. Experimental results of two specimen sizes can be well explained by the thermal elastic and fracture energy theories. In the cyclic thermal shock testing with the quenching temperature difference below the critical temperature difference, no significant thermal fatigue damage was observed as indicated by the results of residual flexure strength measurement and other nondestructive evaluation methods such as dye penetration, ultrasonic and strain gage measurement of elastic modulus, and Vickers indentation hardness and crack growth observation. The evaluation of the applied nondestrucyive evaluation methods as a detecting tool for thermal shock damage is conducted by comparing with the results of residual flexure strength measurement.