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Effects of crystal size on the mechanical properties of a lithium disilicate glass-ceramic

机译：晶体尺寸对二硅酸锂玻璃陶瓷力学性能的影响

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摘要

Crystal size of lithium disilicate (LD) phase in a LD glass-ceramic was changed by thermally controlled crystallization of a precursory LD glass at different temperatures. Effects of the crystal size on the mechanical properties of the glass-ceramic were investigated. It was found that the flexural strength presented a hump-like variation trend with increasing the crystal size, the hardness monotonously decreased at the same time. It was further confirmed that micro residual compressive stresses existed inside the LD crystals due to the thermal expansion mismatch between the glass matrix and the crystalline phase. The levels of the residual stresses increased with increasing the crystal size. The crystal size performed dual effects on the flexural strength of the glass-ceramic: an "interlocking effect" caused by larger-sized LD crystals and a "micro residual stress effect" related to the balancing tensile stresses in the glass matrix. Higher residual tensile stresses in the glass matrix induced by larger-sized LD crystals would counteract the "interlocking effect" of the crystals, causing the strength degradation. The hardness of the glass-ceramic was mainly controlled by the "micro residual stress effect".
机译：LD玻璃陶瓷中二硅酸锂（LD）相的晶体大小通过在不同温度下对前体LD玻璃进行热控制结晶来改变。研究了晶体尺寸对玻璃陶瓷机械性能的影响。结果表明，随着晶体尺寸的增加，抗弯强度呈现峰状变化趋势，同时硬度单调降低。进一步证实，由于玻璃基体和结晶相之间的热膨胀失配，LD晶体内部存在微小的残余压缩应力。残余应力的水平随着晶体尺寸的增加而增加。晶体尺寸对玻璃陶瓷的抗弯强度产生双重影响：较大尺寸的LD晶体引起的“互锁效应”和与玻璃基体中平衡拉伸应力有关的“微小残余应力效应”。较大尺寸的LD晶体在玻璃基质中产生的较高的残余拉应力会抵消晶体的“互锁效应”，从而导致强度降低。微晶玻璃的硬度主要由“微小残余应力效应”控制。

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  • 来源
    《Materials Science and Engineering》 |2016年第4期|332-339|共8页
  • 作者

    D. Li; J.W. Guo; X.S Wang; S.F. Zhang; L. He;

  • 作者单位

    State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, 28 West Xianning Road, Xi'an 710049, China;

    State Key Laboratory of Military Stomatology, Department of Prosthodontics, School of Stomatology, Fourth Military Medical University, 145 West Changle Road, Xi'an 710032, China;

    State Key Laboratory of Military Stomatology, Department of Prosthodontics, School of Stomatology, Fourth Military Medical University, 145 West Changle Road, Xi'an 710032, China;

    State Key Laboratory of Military Stomatology, Department of Prosthodontics, School of Stomatology, Fourth Military Medical University, 145 West Changle Road, Xi'an 710032, China;

    State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, 28 West Xianning Road, Xi'an 710049, China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Mechanical characterization; Ceramics; Class; Crystallization; Lithium disilicate; Residual stresses;

    机译：机械特性陶瓷;类;结晶;二硅酸锂;残余应力;

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