The crystallization process of STS glass-ce-ramics was carried out in a constant temperature. The glass-ceramics still show good piezoelectric properties. The mecha-nism of orientation crystallization was investigated...The crystallization process of STS glass-ce-ramics was carried out in a constant temperature. The glass-ceramics still show good piezoelectric properties. The mecha-nism of orientation crystallization was investigated bv means of DTA.展开更多
The automatic crystallization of MgO during the sintering of Si_(3)N_(4)—MgO—CeO_(2) is first discovered.For Si_(3)N_(4)—MgO—CeO_(2) ceramics,the MgO—CeO_(2) would react with SiO_(2) to form liquid at 1450℃and t...The automatic crystallization of MgO during the sintering of Si_(3)N_(4)—MgO—CeO_(2) is first discovered.For Si_(3)N_(4)—MgO—CeO_(2) ceramics,the MgO—CeO_(2) would react with SiO_(2) to form liquid at 1450℃and then transform into glassy phase in the sintered bodies after cooling down.Above 1550℃,MgO would crystallize automatically during sinter-ing.So the glassy phase which is harmful to the high temper-ature properties is then eliminated.The present work is of great value for theoretical study and application.展开更多
基金This paper is aided financially by National Natural Science Foundation of China.
文摘The crystallization process of STS glass-ce-ramics was carried out in a constant temperature. The glass-ceramics still show good piezoelectric properties. The mecha-nism of orientation crystallization was investigated bv means of DTA.
文摘The automatic crystallization of MgO during the sintering of Si_(3)N_(4)—MgO—CeO_(2) is first discovered.For Si_(3)N_(4)—MgO—CeO_(2) ceramics,the MgO—CeO_(2) would react with SiO_(2) to form liquid at 1450℃and then transform into glassy phase in the sintered bodies after cooling down.Above 1550℃,MgO would crystallize automatically during sinter-ing.So the glassy phase which is harmful to the high temper-ature properties is then eliminated.The present work is of great value for theoretical study and application.
