Objective

The objective of the present study is to understand the role of yttria stabilized zirconia (YSZ) in achieving the desired spectrum of clinically relevant mechanical properties (hardness, elastic modulus, fracture toughness and brittleness index) and chemical solubility of mica glass ceramics.

Methods

The glass–zirconia mixtures with varying amounts of YSZ (0, 5, 10, 15 and 20 wt.%) were ball milled, compacted and sintered to obtain pellets of glass ceramic-YSZ composites. Phase analysis was carried out using X-ray diffraction and microstructural characterization with SEM revealed the crystal morphology of the composites. Mechanical properties such as Vickers hardness, elastic modulus, indentation fracture toughness and chemical solubility were assessed.

Results

Phase analysis of sintered pellets of glass ceramic-YSZ composites revealed the characteristic peaks of fluorophlogopite (FPP) and tetragonal zirconia. Microstructural investigation showed plate and lath-like interlocking mica crystals with embedded zirconia. Vickers hardness of 9.2 GPa, elastic modulus of 125 GPa, indentation toughness of 3.6 MPa·m^1/2, and chemical solubility of 30 μg/cm² (well below the permissible limit) were recorded with mica glass ceramics containing 20 wt.% YSZ.

Significance

An increase in hardness and toughness of the glass ceramic-YSZ composites with no compromise on their brittleness index and chemical solubility has been observed. Such spectrum of properties can be utilised for developing a machinable ceramic for low stress bearing inlays, onlays and veneers.

中文翻译：

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用于牙齿修复的氧化锆增韧云母玻璃陶瓷。

客观的

本研究的目的是了解氧化钇稳定氧化锆 (YSZ) 在实现所需的临床相关机械性能谱（硬度、弹性模量、断裂韧性和脆性指数）和云母玻璃陶瓷的化学溶解度方面的作用。

方法

对具有不同量 YSZ（0、5、10、15 和 20 wt.%）的玻璃-氧化锆混合物进行球磨、压实和烧结，以获得玻璃陶瓷-YSZ 复合材料的颗粒。使用 X 射线衍射和使用 SEM 的微观结构表征进行相分析，揭示了复合材料的晶体形态。评估了维氏硬度、弹性模量、压痕断裂韧性和化学溶解度等机械性能。

结果

玻璃陶瓷-YSZ 复合材料烧结球团的物相分析揭示了氟金云母 (FPP) 和四方氧化锆的特征峰。显微结构研究显示板状和板条状互锁云母晶体嵌入氧化锆。用含有 20 wt.% 的云母玻璃陶瓷记录了9.2 GPa 的维氏硬度、125 GPa 的弹性模量、3.6 MPa·m ^1/2的压痕韧性和 30 μg/cm ²的化学溶解度（远低于允许限度） YSZ。

意义

已经观察到玻璃陶瓷-YSZ 复合材料的硬度和韧性增加，而脆性指数和化学溶解度没有受到影响。这种特性谱可用于开发用于低应力轴承嵌体、高嵌体和饰面的可加工陶瓷。