粉末粒度对二硅酸锂玻璃陶瓷烧结行为、微观结构和弯曲强度的影响(英文)

Effect of Particle Size on the Sintering Behavior, Microstructure and Flexural Strength of Lithium Disilicate Glass-Ceramics

采用热压烧结技术成功制备了SiO2-Li2O-P2O5-ZrO2-Al2O3-K2O-CeO系二硅酸锂玻璃陶瓷。研究了不同粉体粒度对其烧结行为、相组成、微观结构和弯曲强度的影响。结果表明,不同粉体粒度制备的玻璃陶瓷晶相组成类似,主晶相均为Li2Si2O5晶体;微观形貌均为互锁的Li2Si2O5棒状晶粒,但Li2Si2O5晶体的晶粒尺寸及分布随粉末粒度变化有所不同。当玻璃粉末粒度为14μm时,烧结出的二硅酸锂玻璃陶瓷晶粒尺寸合适,密度较高,三点弯曲强度最高,可达354±17 MPa;且透光性能良好,与医用EMAX材料接近。

Li2Si2O5 glass-ceramics derived from the SiO2-Li2O-P2O5-ZrO2-Al2O3-K2O-CeO system were synthesized by hot-pressing sintering. Glass-ceramics powders with different particle size were used and their influence on the sintering behavior, phase composition, microstructure and flexure strength of lithium disilicate glass ceramics was studied. The X-ray diffraction results reveal that all samples have a similar crystalline structure though the particle sizes aer different and the main crystalline phase corresponds to Li2Si2O5. Scanning electron microscopy analysis shows an interlocking microstructure of rod-shaped Li2Si2O5 crystals in all specimens. However, the glass-ceramics produced with different particle size present different crystal sizes and distribution. Attributing to its proper crystal size and high density, the 14 μm sample exhibits the maximum flexural strength of 354±17 MPa as well as comparable translucency of EMAX.