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首页> 外文会议>Advances in bioceramics and porous ceramics III >THE EFFECTS OF β-Si_3N_4 SEEDING AND α-Si_3N_4 POWDER SIZE ON THE DEVELOPMENT OF POROUS β-Si_3N_4 CERAMICS
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THE EFFECTS OF β-Si_3N_4 SEEDING AND α-Si_3N_4 POWDER SIZE ON THE DEVELOPMENT OF POROUS β-Si_3N_4 CERAMICS

机译：β-Si_3N_4粉末和α-Si_3N_4粉末尺寸对多孔β-Si_3N_4陶瓷发展的影响

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摘要

Porous silicon nitride (Si_3N_4) ceramics have significant potential in a number of engineering applications due to their potential for favorable mechanical properties, even with moderately high porosities. In the present work two methods of microstructural control were assessed; (ⅰ) seeding with β-Si_3N_4 grains and (ⅱ) varying the α-Si_3N_4 starting powder size. The aim of this work was to develop a ceramic with an improved microstructure, resulting in increased strength. The β-Si_3N_4 seed grains were prepared 'in-house' using a simple, moderately low-temperature processing approach. A series of nominally bi-modal α-Si_3N_4 powder mixtures were also examined, using various ratios of powders with particle sizes of approximately 0.3 and 1.0 μm. It was demonstrated that the β-Si_3N_4 aspect ratio was predominantly influenced by the amount of coarse α-Si_3N_4 powder in the starting mixture, rather than the amount of β-Si_3N_4 seed grains. The highest aspect ratios (up to ～12:1) were obtained when using 100 % coarse α-Si_3N_4, as the a- to β-Si_3N_4 transformation period is prolonged. The strength was also slightly increased with a higher coarse α-Si_3N_4 fraction in the starting mixture. In this instance, seeding was shown to provide a small benefit, with the highest strengths (up to ～350 MPa) observed for samples prepared with 0.5 and 1 wt. % β-Si_3N_4 seed crystals.
机译：氮化硅（Si_3N_4）多孔陶瓷由于具有良好的机械性能（即使具有适度的高孔隙率）的潜力，在许多工程应用中也具有巨大的潜力。在本工作中，评估了两种微结构控制方法； （ⅰ）植入β-Si_3N_4晶粒，（and）改变α-Si_3N_4起始粉末的大小。这项工作的目的是开发一种具有改善的微观结构，从而提高强度的陶瓷。 β-Si_3N_4籽粒是使用简单的，适度的低温加工方法“内部”制备的。还检查了一系列标称双峰α-Si_3N_4粉末混合物，使用了各种比例的粒径约为0.3和1.0μm的粉末。结果表明，β-Si_3N_4长径比主要受起始混合物中粗α-Si_3N_4粉末含量的影响，而不是β-Si_3N_4籽粒的含量影响。当使用100％粗α-Si_3N_4时，由于a-到β-Si_3N_4的转变周期延长，因此获得了最高的纵横比（高达〜12：1）。随着起始混合物中较高的粗α-Si_3N_4分数，强度也略有提高。在这种情况下，播种显示出了小的好处，用0.5和1 wt。％的样品制备的样品具有最高的强度（最高〜350 MPa）。 ％β-Si_3N_4籽晶。

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  • 会议地点 Daytona Beach FL(US);Daytona Beach FL(US)
  • 作者

    Daniel A. Gould; Kevin P. Plucknett; Liliana B. Garrido; Luis A. Genova;

  • 作者单位

    Dalhousie University, Materials Engineering Program, Department of Process Engineering and Applied Sciences, 1366 Barrington Street, Halifax, Nova Scotia, B3J 2X4, Canada;

    rnDalhousie University, Materials Engineering Program, Department of Process Engineering and Applied Sciences, 1366 Barrington Street, Halifax, Nova Scotia, B3J 2X4, Canada;

    rnCONICET, Centro de Technologia de Recursos Minerales y Ceramica (CETMIC, CIC-CONICET-UNLP), Cam. Centenario y 506, C.C.49 (B 1897 ZCA) M.B. Gonnet. Pcia. De Buenos Aires, ARGENTINA;

    rnIPEN Instituto de Pesquisas Energeticas e Nucleares, CCTM Centro de Ciencia e Technologia de Materiais, Cidade Universitaria, Travessa R 400, 05508-900 Sao Paulo, BRAZIL;

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  • 正文语种 eng
  • 中图分类 生物材料学;
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