牙科二硅酸锂玻璃陶瓷材料机械残余应力的拉曼光谱分析

doi:10.3877/cma.j.issn.1674-1366.2016.04.004

中华口腔医学研究杂志(电子版) ›› 2016, Vol. 10 ›› Issue (04) : 250 -254. doi: 10.3877/cma.j.issn.1674-1366.2016.04.004

所属专题：文献；

基础研究

牙科二硅酸锂玻璃陶瓷材料机械残余应力的拉曼光谱分析

王晓东¹, 刀力¹, 简裕涛¹, 赵克¹^,^†(

)

^1. 510055　广州，中山大学光华口腔医学院·附属口腔医院，广东省口腔医学重点实验室

收稿日期:2016-05-28 出版日期:2016-08-01
通信作者: 赵克
基金资助:
国家自然科学基金(81470767)

A preliminary study on mechanical residual stress of dental ceramic by Raman spectra

Xiaodong Wang¹, Li Dao¹, Yutao Jian¹, Ke Zhao¹^,^†()

^1. Guanghua School of Stomatology, Hospital of Stomatology, Sun Yat-sen University, Guangdong Provincial Key Laboratory of Stomatology, Guangzhou 510055, China

Received:2016-05-28 Published:2016-08-01
Corresponding author: Ke Zhao
About author:
Corresponding author: Zhao Ke, Email: zhaoke@mail.sysu.edu.cn

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目的

使用拉曼光谱技术研究静态加载对二硅酸锂玻璃陶瓷（LDG）晶相改变及内部机械残余应力的影响。

方法

制作LDG盘状试件，采用双轴弯曲法对试件分别进行100和400 N预加载。使用激光显微共焦拉曼光谱仪785 nm波段入射激光扫描两次预加载后试件中央区2 mm × 2 mm区域。根据特征峰的位移反映材料内部应力变化情况，绘制拉曼应力图。

结果

LDG拉曼光谱在413 cm^-1波段存在Si₂O₅基团的特征性峰。特征性拉曼峰位置的改变可有效反映内部残余应力的变化。100 N预加载后试件应力分布整体比较均匀，413 cm^-1附近的拉曼峰分布在413.2 ~ 413.6 cm^-1，存在较多应力集中点。400 N预加载后试件的残余应力分布不均匀性增加，特征性拉曼峰位置分布范围扩大至约1.5 cm^-1（413.1 ~ 414.6 cm^-1），应力的集中点更为明显，出现应力集中区。

结论

通过拉曼光谱技术证实了LDG受静态加载后存在机械残余应力，且随着载荷的增加残余应力更加显著。

关键词: 拉曼光谱, 残余应力, 二硅酸锂玻璃陶瓷

Objective

To investigate the influence of static loading on crystalline change and mechanical residual stress in lithium disilicate glass-ceramic (LDG) by Raman spectra.

Methods

LDG ceramic disks specimens were fabricated according to the manufacturer′s instructions. Biaxial flexural testing with preloading of 100 N or 400 N was conducted. Spectra were collected using a Raman microspectroscopy (laser emitting at 785 nm) from the central 2 mm × 2 mm region of tensile surface after each preloading. The residual micro-stresses within the ceramic were evaluated according to the displacement of specific band peak, and the Raman stress maps were coincided.

Results

Raman spectra of LDG ceramic demonstrated a specific band at 413 cm^-1 which was tested as Si₂O₅. Displacement of specific band reflected effectively the internal residual stress. The position of the band is 413.2-413.6 cm^-1 after 100 N preloading with residual stress concentration to some degree. While the displacement enhanced from 413.1 cm^-1 to 414.6 cm^-1 after 400 N preloading, the stress concentration became more obvious and appeared as a stress concentration region.

Conclusions

The mechanical residual stress is confirmed with application of Raman microspectroscopy in LDG ceramic after static loading. As the preloading values increase, the residual stress concentration becomes more obvious.

Key words: Raman spectra, Residual stress, Lithium disilicate glass-ceramic

图1 试件尺寸及扫描区域示意图

图2 二硅酸锂玻璃陶瓷拉曼光谱图

图3 100 N预加载卸载后拉曼应力图

图4 400 N预加载卸载后拉曼应力图

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