稀有金属材料与工程
稀有金屬材料與工程
희유금속재료여공정
RARE METAL MATERIALS AND ENGINEERNG
2008年
z2期
491-496
,共6页
刚玉%莫来石%氧化铝%基质%耐火材料%热震
剛玉%莫來石%氧化鋁%基質%耐火材料%熱震
강옥%막래석%양화려%기질%내화재료%열진
corundum%mullite%alumina%matrix%refractory materials%thermal shock
对刚玉-莫来石基质在1550～1700℃烧成4 h,研究其α-Al2O3添加量对刚玉-莫来石基质性能的影响规律.研究结果表明,刚玉-莫来石基质是通过液态SiO2和原料中SiO2与α-Al2O3反应生产的莫来石相进行致密,1650℃是基质的烧成温度转折点,超过此温度,莫来石相发生分解形成无定性SiO2,将影响基质的结构及性能.基质的体积密度和强度随烧成温度和α-Al2O3添加量的增加而增大,并高于刚玉-莫来石窑具材料.随着α-Al2O3添加量的增加,基质的主要断裂方式由穿晶断裂向沿晶断裂方式转变.基质的抗热震性能随烧成温度和α-Al2O3添加量的增加而降低,烧成温度和α-Al2O3添加量是基质抗热震性能主要影响因素.
對剛玉-莫來石基質在1550～1700℃燒成4 h,研究其α-Al2O3添加量對剛玉-莫來石基質性能的影響規律.研究結果錶明,剛玉-莫來石基質是通過液態SiO2和原料中SiO2與α-Al2O3反應生產的莫來石相進行緻密,1650℃是基質的燒成溫度轉摺點,超過此溫度,莫來石相髮生分解形成無定性SiO2,將影響基質的結構及性能.基質的體積密度和彊度隨燒成溫度和α-Al2O3添加量的增加而增大,併高于剛玉-莫來石窯具材料.隨著α-Al2O3添加量的增加,基質的主要斷裂方式由穿晶斷裂嚮沿晶斷裂方式轉變.基質的抗熱震性能隨燒成溫度和α-Al2O3添加量的增加而降低,燒成溫度和α-Al2O3添加量是基質抗熱震性能主要影響因素.
대강옥-막래석기질재1550～1700℃소성4 h,연구기α-Al2O3첨가량대강옥-막래석기질성능적영향규률.연구결과표명,강옥-막래석기질시통과액태SiO2화원료중SiO2여α-Al2O3반응생산적막래석상진행치밀,1650℃시기질적소성온도전절점,초과차온도,막래석상발생분해형성무정성SiO2,장영향기질적결구급성능.기질적체적밀도화강도수소성온도화α-Al2O3첨가량적증가이증대,병고우강옥-막래석요구재료.수착α-Al2O3첨가량적증가,기질적주요단렬방식유천정단렬향연정단렬방식전변.기질적항열진성능수소성온도화α-Al2O3첨가량적증가이강저,소성온도화α-Al2O3첨가량시기질항열진성능주요영향인소.
The effect of fine alumina(α-Al2O3)addition on the properties of corundum-mullite ceramic matrix fired at temperature from 1550℃to 1700℃for 4 h had been investigated.It is found that the matrix is densified by liquid silica and new-formed mullite by the reaction of silica and alumina,and the temperature at 1650℃ is an important turning point for the firing of corundum-mullite ceramic.When the firing temperature excesses 1650℃,the mullite phase is dissolved to form an amount of amorphous silica,which affects the properties and microstructure of the ceramic.The bulk density and strength of the ceramic increase with the firing temperature and alumina addition,which are higher than those of corundum-mullite refractory materials.There is a significant change of the fracture path from mainly transgranular to a significant amount of intergranlular,with the increase of alumina addition.Thermal shock resistance of the specimens decreases with the firing temperature and alumina addition.Thermal shock resistance is strongly dependent of firing temperature and alumina addition.
