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首页> 外文期刊>Journal of Materials Research >Low friction and severe wear of alumina in cryogenic environment: A first report
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Low friction and severe wear of alumina in cryogenic environment: A first report

机译：低温环境下氧化铝的低摩擦和严重磨损：首次报告

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摘要

Structural ceramics are considered as potential candidate materials for use in hybrid bearings in rocket turbopumps, operated under high stress in cryogenic environment. The friction and wear-related surface failure is considered as one of the critical factors in selecting the materials for cryo-turbopumps of Space Shuttle Main Engine (SSME). To obtain fundamental understanding of the tribological properties of ceramics in cryogenic environment, a very first set of sliding wear tests were carried out on self-mated A1_2O_3, a model brittle ceramic material, in liquid nitrogen (LN2) under varying load (2-10 N) and high rotational speed of 2550 rpm, using a newly designed cryogenic tribometer. The present research attempts to answer some important questions: (i) What would be the influence of LN2 on frictional and fracture behavior at sliding contacts? (ii) How does the material removal process occur in LN2 environment? Our experimental results reveal that self-mated alumina exhibits low steady-state coefficient of friction -0.13-0.18 and suffers from high wear rate (10~(-5) mm~3/Nm) under the selected testing conditions. The novelty of the present work also lies in presenting some interesting results, for the first time, concerning the deformation and fracture of alumina at cryogenic temperature under high speed sliding conditions. Detailed scanning electronic microscope observation of the worn surfaces indicates that severe damage of both ball and flat occurs in cryogenic environment by transgranular and intergranular fracture. The observed wear behavior is explained in terms of thermal heat dissipation and brittle fracture of alumina in LN2.
机译：结构陶瓷被认为是在低温环境中在高应力下运行的火箭涡轮泵混合轴承中潜在的候选材料。与摩擦和磨损相关的表面破坏被认为是选择航天飞机主机（SSME）的低温涡轮泵材料的关键因素之一。为了对低温环境下的陶瓷的摩擦学特性有基本的了解，我们在液态氮（LN2）中，在变化的载荷下（2-10），对自交配的A1_2O_3（一种脆性陶瓷模型材料）进行了第一套滑动磨损测试。 N）和使用新设计的低温摩擦计的2550 rpm的高转速。本研究试图回答一些重要问题：（i）LN2对滑动接触处的摩擦和断裂行为有何影响？ （ii）在LN2环境中如何进行材料去除过程？我们的实验结果表明，自交配氧化铝在选定的测试条件下具有较低的稳态摩擦系数-0.13-0.18，并具有较高的磨损率（10〜（-5）mm〜3 / Nm）。本工作的新颖性还在于，首次提出了一些有趣的结果，涉及在高速滑动条件下在低温下氧化铝的变形和断裂。对磨损表面进行的详细扫描电子显微镜观察表明，在低温环境下，经晶和晶间断裂会严重破坏钢球和扁钢。观察到的磨损行为是根据LN2中氧化铝的散热和脆性断裂来解释的。

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  • 来源
    《Journal of Materials Research》 |2006年第4期|p.832-843|共12页
  • 作者

    Rohit Khanna; Bikramjit Basu;

  • 作者单位

    Laboratory for Advanced Ceramics, Department of Materials and Metallurgical Engineering, Indian Institute of Technology, Kanpur, India;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 工程材料学;
  • 关键词

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