Effects of BN content on the mechanical properties of nanocrystalline 3Y-TZP/Al<sub>2</sub>O<sub>3</sub>/BN dental ceramics

Lei Zhou; Yan-fang Zhang; Pan Yi; Ying Wen; Chao-fang Dong; Li-min Meng; Se-fei Yang

doi:10.1007/s12613-021-2324-0

Volume 28 Issue 11

Nov. 2021

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2021 > 28(11): 1854-1860

Lei Zhou, Yan-fang Zhang, Pan Yi, Ying Wen, Chao-fang Dong, Li-min Meng, and Se-fei Yang, Effects of BN content on the mechanical properties of nanocrystalline 3Y-TZP/Al₂O₃/BN dental ceramics, Int. J. Miner. Metall. Mater., 28(2021), No. 11, pp. 1854-1860. https://doi.org/10.1007/s12613-021-2324-0

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Lei Zhou, Yan-fang Zhang, Pan Yi, Ying Wen, Chao-fang Dong, Li-min Meng, and Se-fei Yang, Effects of BN content on the mechanical properties of nanocrystalline 3Y-TZP/Al2O3/BN dental ceramics, Int. J. Miner. Metall. Mater., 28(2021), No. 11, pp. 1854-1860. https://doi.org/10.1007/s12613-021-2324-0

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Research Article

Effects of BN content on the mechanical properties of nanocrystalline 3Y-TZP/Al₂O₃/BN dental ceramics

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Corresponding author:
Se-fei Yang E-mail: yangyangfeifei@aliyun.com
Received: 6 May 2021; Revised: 16 June 2021; Accepted: 29 June 2021; Available online: 30 June 2021

Abstract

Abstract

3Y-TZP/3wt% Al₂O₃ powder was coated with varying amounts of BN using the urea and borate reaction sintering method, and then multiphase ceramics were prepared by hot pressing sintering. The micro-topography and the compositional analysis of synthesized ceramics were conducted through scanning electron microscopy, transmission electron microscopy and X-ray diffraction. A mechanical tester was used to analyze the Vickers hardness, fracture toughness, and bending strength of the synthesized ceramics. The results showed that the ceramic with a BN content of 12wt% showed the best processability, but had diminished mechanical properties (such as fracture toughness and bending strength). The ceramic with a BN content of 9wt% showed better processability than those with 3wt% and 6wt% BN. However, the fracture toughness was affected by the addition of 9wt% BN, making this ceramic only usable as a base material for a three-unit fixed bridge. In contrast, the ceramics with a BN content of 3wt% or 6wt% fulfilled the criteria for use in multi-unit restoration, but their low processability made them unsuitable for milling after sintering.
- multiphase ceramic;
- boron nitride;
- mechanical properties;
- reaction sintering method

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