火花等离子烧结对锂硅玻璃陶瓷的影响。
The effect of spark plasma sintering on lithium disilicate glass-ceramics.
机构信息
Centre for Adult Oral Health, Institute of Dentistry, Barts and the London School of Medicine and Dentistry, Queen Mary University of London, Turner Street, Whitechapel E1 2AD, UK.
Dental Physical Sciences, Institute of Dentistry, Barts and The London School of Medicine and Dentistry, Queen Mary University of London, Mile End Road, E1 4NS, UK.
出版信息
Dent Mater. 2015 Oct;31(10):e226-35. doi: 10.1016/j.dental.2015.07.001. Epub 2015 Jul 23.
OBJECTIVES
To evaluate the effects of spark plasma sintering (SPS) on the microstructure of lithium disilicate glass-ceramics.
METHODS
IPS e.max CAD glass-ceramic samples were processed using spark plasma sintering (SPS) and conventionally sintered (CS) as a comparison. Specimens were sintered at varying temperatures (T1: 840°C, T2: 820°C, T3: 800°C), heating rates (HR1: 150°C/min, HR2: 300°C/min, HR3: 500°C/min) and pressures (P1: 15MPa, P2: 50MPa, P3: 70MPa). IPS e.max Press glass powder samples were densified at 750 and 800°C (50 or 200MPa pressure). Samples were characterized using XRD, HTXRD, and SEM and quantitative image analysis.
RESULTS
There was a significant increase in median crystal size (MCS) between the CS and the SPS T1 groups. A statistical difference (p>0.05) in MCS between SPS T1 and SPS T2 groups was observed. The SPS HR3 sample produced a smaller MCS than the CS, SPS HR1 and HR2 groups (p<0.05). The SPS P3 sample had a reduction in MCS compared with the CS group (p<0.05). XRD of the SPS samples revealed major lithium disilicate/lithium metasilicate phases and minor lithium orthophosphate and cristobalite/quartz phases. Densified IPS e.max Press glass samples resulted in fine fibrils or graduated lithium disilicate crystals.
SIGNIFICANCE
The effects of SPS were used to refine the microstructure of IPS e.max CAD lithium disilicate glass-ceramics. Densification by SPS of IPS e.max Press glass resulted in textured and fine nano-crystalline microstructures. SPS generated glass-ceramic microstructures may have unique properties and could be useful in the production of CAD/CAM materials for dentistry.
目的
评估火花等离子烧结（SPS）对锂硅玻璃陶瓷微观结构的影响。
方法
采用火花等离子烧结（SPS）和传统烧结（CS）对比处理 IPS e.max CAD 玻璃陶瓷样品。将样品在不同温度（T1：840°C，T2：820°C，T3：800°C）、升温速率（HR1：150°C/min，HR2：300°C/min，HR3：500°C/min）和压力（P1：15MPa，P2：50MPa，P3：70MPa）下进行烧结。IPS e.max Press 玻璃粉末样品在 750°C 和 800°C（50 或 200MPa 压力）下致密化。采用 XRD、HTXRD 和 SEM 及定量图像分析对样品进行了表征。
结果
CS 和 SPS T1 组之间的中位晶粒度（MCS）有显著增加。SPS T1 和 SPS T2 组之间的 MCS 存在统计学差异（p>0.05）。SPS HR3 样品的 MCS 小于 CS、SPS HR1 和 HR2 组（p<0.05）。SPS P3 样品的 MCS 与 CS 组相比有所降低（p<0.05）。SPS 样品的 XRD 显示主要的锂硅/锂偏硅酸盐相和少量的磷酸锂和方石英/石英相。致密化的 IPS e.max Press 玻璃样品产生了细小的纤维或分级的锂硅二酸盐晶体。
意义
SPS 的作用是细化 IPS e.max CAD 锂硅玻璃陶瓷的微观结构。SPS 对 IPS e.max Press 玻璃的致密化导致了织构化和精细纳米晶的微观结构。SPS 生成的玻璃陶瓷微观结构可能具有独特的性能，可用于牙科 CAD/CAM 材料的生产。
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