CAJ | 학술논문

为了研究浇注料烘烤过程中其内部状态变化与其弹性模量变化的相关性，将纯铝酸钙水泥结合的刚玉质浇注料振动成型，自然养护24 h后脱模，部分脱模后试样继续在烘箱中于110℃干燥48 h，部分干燥后试样继续在500℃热处理3 h，采用弯曲共振法检测试样在不同加热过程中的弹性模量变化：1）对脱模后试样，以5℃·min－1的速率升温，并在50℃及其整数倍温度点保温60～90 min，检测试样在加热过程中的弹性模量变化；2）对干燥后试样，以5℃·min－1的速率连续升温至500℃，检测试样在加热过程中的弹性模量变化；3）对500℃热处理后试样，以15℃·min－1的速率连续升温至500℃后保温35 min，检测试样在保温过程中的弹性模量变化。结果表明：1）自由水的排出使试样的弹性模量增大，结合水的排出则使其弹性模量减小；2）在连续升温的加热过程中，自由水和结合水的排出滞后于设置保温的加热过程，试样弹性模量的变化也出现相应的滞后现象；3）快速连续升温过程中试样内部存在热应力，温度和热应力的存在会影响试样的弹性模量；4）浇注料烘烤过程中弹性模量的变化可综合反映其内部状态变化尤其是水分排出情况的变化。
위료연구요주료홍고과정중기내부상태변화여기탄성모량변화적상관성，장순려산개수니결합적강옥질요주료진동성형，자연양호24 h후탈모，부분탈모후시양계속재홍상중우110℃간조48 h，부분간조후시양계속재500℃열처리3 h，채용만곡공진법검측시양재불동가열과정중적탄성모량변화：1）대탈모후시양，이5℃·min－1적속솔승온，병재50℃급기정수배온도점보온60～90 min，검측시양재가열과정중적탄성모량변화；2）대간조후시양，이5℃·min－1적속솔련속승온지500℃，검측시양재가열과정중적탄성모량변화；3）대500℃열처리후시양，이15℃·min－1적속솔련속승온지500℃후보온35 min，검측시양재보온과정중적탄성모량변화。결과표명：1）자유수적배출사시양적탄성모량증대，결합수적배출칙사기탄성모량감소；2）재련속승온적가열과정중，자유수화결합수적배출체후우설치보온적가열과정，시양탄성모량적변화야출현상응적체후현상；3）쾌속련속승온과정중시양내부존재열응력，온도화열응력적존재회영향시양적탄성모량；4）요주료홍고과정중탄성모량적변화가종합반영기내부상태변화우기시수분배출정황적변화。
Calcium aluminate cement bonded corundum castable specimens were prepared by vibration molding in order to research the relativity between internal state and Young’s modulus.After natural curing for 24 h and demolding,some specimens were dried at 110 ℃ for 48 h in the oven,and other specimens were heated at 500 ℃ for 3 h.Through bending resonance method,Young’s modulus variation was re-searched during different heating processes:1)for demolded specimens,heat at 5 ℃·min -1 and hold for 60-90 min at the temperatures of 50 ℃integer times,and test Young’s modulus variation during heating;2)for dried specimens,heat to 500 ℃at 5 ℃·min -1,and research Young’s modulus variation during con-tinuous heating;3)for specimens after heating at 500 ℃,heat to 500 ℃ at 15 ℃·min -1 and then hold for 35 min,and test Young’s modulus variation during holding process.The results indicate that:1)the remov-al of free water can increase Young’s modulus,but the release of hydrate water can reduce Young’s mod-ulus;2)the removal of free water and hydrate water during continuous heating lags behind the heating process containing holding,Young’s modulus variation also lags;3)thermal stress exists in the specimens during continuous rapid heating,the existence of temperature and thermal stress can influence Young’s modulus;4)Young’s modulus can well reflect the internal changes of castables during heating,especially the behavior in the dehydration process.