摘要
以煅烧α-Al_(2)O_(3)粉体为原料、纳米TiO_(2)为烧结助剂、羧甲基纤维素为成型黏结剂,采用模压成型-常压烧结制备了Al_(2)O_(3)陶瓷,研究了烧结温度及纳米TiO_(2)添加量对Al_(2)O_(3)陶瓷微观形貌、线收缩率、物相结构、体积密度、孔隙率、抗折强度和白度的影响,评估了烧结特性。结果表明,添加适量纳米TiO_(2)能够显著提高Al_(2)O_(3)陶瓷的烧结性能,而过量纳米TiO_(2)会造成Al_(2)O_(3)晶粒异常长大,进而导致收缩率和体积密度降低、孔隙率增大。当纳米TiO_(2)添加量为0.7%(质量分数)、烧结温度为1 500℃时,Al_(2)O_(3)陶瓷性能较为优异,其抗折强度达到最大值,为(188.89±5.87) MPa,体积密度、孔隙率和白度分别为3.45 g·cm^(-3)、7.78%和76.6。
Al_(2)O_(3) ceramics were prepared by compression molding and pressureless sintering using calcinedα-Al_(2)O_(3) powder as raw material,nano-TiO_(2) as sintering aid and carboxymethyl cellulose as binder.The effects of sintering temperature and nano-TiO_(2) addition on microstructure,linear shrinkage,phase structure,bulk density,porosity,flexural strength and whiteness of Al_(2)O_(3) ceramics were studied,and the sintering characteristics were evaluated.The results show that the addition of appropriate amount of nano-TiO_(2) can significantly improve the sintering performance of Al_(2)O_(3) ceramics,while excessive nano-TiO_(2) will cause the abnormal growth of Al_(2)O_(3) grains,which will lead to the decrease of shrinkage and bulk density and the increase of porosity.When the addition amount of nano-TiO_(2) is 0.7%(mass fraction)and the sintering temperature is 1500℃,the properties of Al_(2)O_(3) ceramics are excellent.The flexural strength reaches the maximum value of(188.89±5.87)MPa,and the bulk density,porosity and whiteness are 3.45 g·cm^(-3),7.78%and 76.6.
作者
陈友梅
李镒成
何婷
刘应寿
黎阳
肖汉宁
袁谋云
张伟群
CHEN Youmei;LI Yicheng;HE Ting;LIU Yingshou;LI Yang;XIAO Hanning;YUAN Mouyun;ZHANG Weiqun(School of Materials and Architectural Engineering,Guizhou Normal University,Guiyang 550025,China;College of Materials Science and Engineering,Hunan University,Changsha 410082,China;Guizhou Xinyuan Special Ceramic Technology Co.,Ltd.,Kaili 556011,China;Guizhou Qunhuajiujiu Special Ceramic Technology Co.,Ltd.,Kaili 556011,China)
出处
《硅酸盐通报》
北大核心
2026年第1期256-263,共8页
Bulletin of the Chinese Ceramic Society
基金
贵州省科技计划项目(黔科合中引地[2025]020)
贵州省教育厅自然科学研究项目(黔教技[2022]045,黔教技[2022]012)。
