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Fracture behaviour of chemical vapour deposited and hot isostatically pressed zinc sulphide ceramics

机译：化学气相沉积和热等静压硫化锌陶瓷的断裂行为

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摘要

Fracture behaviour of zinc sulphide ceramics prepared by chemical vapour deposition (CVD) followed by hot isostatic pressing (CVD + HIP) was investigated in terms of flexural strength (σ_f), plane-strain fracture toughness (K_(1c)), even conditional fracture toughness (K_(IQ)), R-curve behaviour (variation of total fracture energy release rate J_c with crack extension, δlδ_c) and fracture mode. The corresponding Knoop Hardness number (KHN) and its correlations to flexural strength (σ_f) are also evaluated and reported. The present study showed that the zinc sulphide (ZnS) ceramics processed by CVD exhibited higher fracture resistance compared to ZnS processed by CVD + HIP condition. This observation is principally attributed to higher grain size associated with post-CVD HIPing process. In both conditions, the ZnS materials exhibited conditional fracture toughness (K_(IQ)) that decreased moderately with increased crack length due to the change in fracture mode form grossly tensile to predominant shear. A constantly rising R-curve behaviour was indicated in both the materials with significant increase in total fracture energy release rate (J_c with the normalised displacement (δlδ_c), a parameter representing crack extension.
机译：研究了化学气相沉积（CVD）然后热等静压（CVD + HIP）制备的硫化锌陶瓷的断裂行为，包括弯曲强度（σ_f），平面应变断裂韧性（K_（1c））甚至条件断裂韧性（K_（IQ）），R曲线行为（总断裂能释放率J_c随裂纹扩展，δlδ_c的变化）和断裂模式。还评估并报告了相应的努氏硬度值（KHN）及其与抗弯强度的关系（σ_f）。本研究表明，与通过CVD + HIP条件处理的ZnS相比，通过CVD处理的硫化锌（ZnS）陶瓷具有更高的抗断裂性。该观察结果主要归因于与CVD后HIPing工艺相关的更高的晶粒尺寸。在这两种情况下，ZnS材料均显示出条件断裂韧性（K_（IQ）），该断裂韧性随着裂纹长度的增加而适度降低，这是由于断裂模式从对主要剪切产生的总体拉伸方式引起的。在两种材料中都显示出不断上升的R曲线行为，总断裂能释放率（J_c归一化位移（δlδ_c），代表裂纹扩展的参数）显着增加。

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  • 来源
    《Materials Science and Engineering》 |2011年第15期|p.5030-5035|共6页
  • 作者

    P.Ramavath; V. Mahender; U.S.Hareesh; R.Johnson; Sweety Kumari; N.Eswara Prasad;

  • 作者单位

    International Advanced Research Centre for Powder Metallurgy and New Materials, Hyderabad 500 005, India;

    International Advanced Research Centre for Powder Metallurgy and New Materials, Hyderabad 500 005, India;

    International Advanced Research Centre for Powder Metallurgy and New Materials, Hyderabad 500 005, India;

    International Advanced Research Centre for Powder Metallurgy and New Materials, Hyderabad 500 005, India;

    Defence Metallurgical Research Laboratory, Kanchanbagh, Hyderabad 500 058, India;

    Regional Centre for Military Airworthiness (Materials), CEMILAC, PO Kanchanbagh, Hyderabad 500 058, India;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    CVD-ZnS; SEM; HIP; fracture toughness; fracture energy; fractography;

    机译：CVD-ZnS;扫描电镜HIP;断裂韧性断裂能断层扫描;

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