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首页> 外文会议>Advanced ceramic coatings and interfaces V >STRENGTH DEGRADING MECHANISMS IN PLASMA SPRAY COATED SILICON NITRIDE
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STRENGTH DEGRADING MECHANISMS IN PLASMA SPRAY COATED SILICON NITRIDE

机译：等离子喷涂硅氮化物的强度下降机理

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摘要

Two high temperature grades of monolithic silicon nitrides were coated with a plasma sprayed barium aluminum strontium silicate (BSAS) based environmental barrier coating (EBC). Their room temperature flexural strengths were then measured. The EBC coated specimens showed nearly 50% loss in strength. Various factors such as substrate preparation methods, plasma spray damage to the substrate, thermal residual stresses, and stress raisers influenced the strength. To determine the strength degrading mechanism, the role played by various phases of the coating process on the substrate strength has been examined, and maximum thermal residual stresses generated in the coating has been modeled. Results indicate that three different types of flaws related to the coating deposition process in combination with tensile residual stress cause strength degradation. Of these flaws, two can be eliminated by pre and post processing treatments, but well bonded splats cannot be avoided. The splats and preexisting flaws on the substrate surface act as a stress raiser due to imposed tensile thermal residual stress of the coating, and thus cause strength degradation.
机译：两种高温等级的整体氮化硅都涂有基于等离子喷涂的钡铝硅酸锶锶（BSAS）的环境屏障涂层（EBC）。然后测量它们的室温抗弯强度。 EBC涂层的样品强度降低了近50％。诸如基材制备方法，等离子喷涂对基材的损伤，热残余应力和应力升高剂等各种因素都会影响强度。为了确定强度下降的机理，已经研究了涂层工艺的各个阶段对基材强度的作用，并对涂层中产生的最大热残余应力进行了建模。结果表明，与涂层沉积过程有关的三种不同类型的缺陷与拉伸残余应力相结合会导致强度降低。在这些缺陷中，可以通过预处理和后期处理消除两个缺陷，但是无法避免粘结良好的碎片。由于施加了涂层的拉伸热残余应力，基材表面上的碎片和预先存在的缺陷会导致应力升高，从而导致强度降低。

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

    Ramakrishna T. Bhatt; Dennis S. Fox; Abdul-Aziz Ali;

  • 作者单位

    Vehicle Technology Center US Army Research Laboratory Glenn Research Center at Lewis Field 21000 Brookpark Rd. Cleveland, OH 44135;

    rnNASA Glenn Research Center 21000 Brookpark Road Cleveland, Ohio 44135;

    rnCleveland State University 2121 Euclid Avenue Cleveland, OH 44115;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 陶瓷工业;
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