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Dynamic mechanical properties of ceramics and ceramic composites at elevated temperatures.

机译：高温下陶瓷和陶瓷复合材料的动态力学性能。

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摘要

Advanced ceramics and ceramic matrix composites (CMCs) have great potential for structural application in combustion engines and other energy generating equipment since the required high operating temperatures in such environments have driven traditional metals and superalloys to their limits due to their melting points. As promising substitutes, ceramics and ceramic matrix composites not only significantly increase service temperature, but also have other salient features, such as low density, good chemical stability, and excellent hardness, which offer additional potential for extending performance limits beyond those offered by metallic materials.;Dynamic mechanical properties are significant properties for structural materials which subject to dynamic loading. Because of the challenge of high temperature and vibratory environments in advanced combustion engines and energy generating systems, ceramics and ceramic composites also should have good dynamic properties so as to increase durability, reliability, and reduce noise and vibration levels. But, unfortunately, knowledge regarding dynamic mechanical properties of ceramics and ceramic composites at elevated temperatures is limited.;This research has focused on the dynamic mechanical properties of silicon nitride based ceramics and composites reinforced with silicon carbide whiskers. These ceramic materials have been considered to be the most attractive structural materials for engine applications. By conducting experiments up to 1100;This research has found: (1) the tested ceramic materials have good damping capacity at elevated temperatures, (2) linear viscoelasticity of glassy phases in the ceramic matrix dominates the damping behavior of the materials at elevated temperatures, (3) thermal cycling loads (most likely, the oscillation during testing as assumed in this research) have effects on dynamic mechanical priorities and microstructures of these ceramics by causing recrystallization of the glassy phases, and (4) the reinforcement phases in ceramic composites may not only improve fracture toughness, but also increase damping capacity, of ceramic materials.
机译：先进的陶瓷和陶瓷基复合材料（CMC）在内燃机和其他发电设备中具有巨大的结构应用潜力，因为在此类环境中所需的高工作温度已将传统金属和高温合金由于其熔点而推向极限。作为有希望的替代品，陶瓷和陶瓷基复合材料不仅可以显着提高使用温度，而且还具有其他显着特征，例如低密度，良好的化学稳定性和出色的硬度，这为将性能极限扩展到金属材料所提供的范围之外提供了额外的潜力。动态力学性能是承受动态载荷的结构材料的重要性能。由于高级内燃机和能量产生系统中高温和振动环境的挑战，陶瓷和陶瓷复合材料也应具有良好的动态性能，以提高耐用性，可靠性并降低噪音和振动水平。但是，不幸的是，关于高温下的陶瓷和陶瓷复合材料的动态力学性能的知识是有限的。这项研究集中在氮化硅基陶瓷和用碳化硅晶须增强的复合材料的动态力学性能上。这些陶瓷材料被认为是发动机应用中最有吸引力的结构材料。通过进行多达1100次的实验；该研究发现：（1）被测试的陶瓷材料在高温下具有良好的阻尼能力，（2）陶瓷基体中玻璃相的线性粘弹性主导了材料在高温下的阻尼行为， （3）热循环载荷（很可能是本研究中假设的测试过程中的振荡）通过引起玻璃相的重结晶而影响了这些陶瓷的动态力学优先级和微观结构，以及（4）陶瓷复合材料中的增强相可能不仅提高了陶瓷材料的断裂韧性，而且还提高了其阻尼能力。

著录项

  • 作者

    Yang, Shuo.;

  • 作者单位

    Wayne State University.;

  • 授予单位 Wayne State University.;
  • 学科 Materials science.;Mechanical engineering.;Acoustics.
  • 学位 Ph.D.
  • 年度 1995
  • 页码 211 p.
  • 总页数 211
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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