• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文会议>International Conference on Surface Modification Technologies >COMPARATIVE WEAR CHARACTERISTICS OF CHROMIUM-CARBIDE AND CHROMIUM-COBALT COATINGS FOR GAS TURBINE COMBUSTOR LINER MATING SURFACES
【24h】

COMPARATIVE WEAR CHARACTERISTICS OF CHROMIUM-CARBIDE AND CHROMIUM-COBALT COATINGS FOR GAS TURBINE COMBUSTOR LINER MATING SURFACES

机译：碳化铬碳化铬碳化铬 - 汽油燃烧室衬垫配合表面的比较磨损特性

获取原文
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Hard coatings on metals have been successfully used to improve the wear resistance of gas turbine's combustor liner mating surfaces, thereby extending the lifespan from typical 8,000 operating hours to 12,000 operating hours. The maximum operating temperature specifically in a GE Frame 9E fleet is about 1100°C. In this work, two types of hard chromium based coatings; chromium-carbide and chromium-cobalt were selected and air plasma sprayed onto the Ni-based superalloy with thicknesses of 100.0 ± 25.0μm. The chromiun-carbide (Cr-C) and chromium-cobalt (Cr-Co) coatings, both having great hardness were used in delaying wear. Cr as the main element has high capability in protecting the underlying substrate particularly at high temperatures. Combination of either Cr-C or Cr-Co coatings would delay the occurrence of surface damages at high temperatures. A dry sliding wear test with a pin-on-disc configuration was carried out at three different operational temperatures; 25°C (room temperature), 100°C and 200°C in order to investigate the correlations between the wear occurrence and the elevated temperatures. The selected temperatures were found below the softening temperature of Ni-based superalloys (substrate). The wear characteristics of coated substrates including the collected debris were analysed by using a scanning electron image (SEM), an energy dispersive X-ray (EDX) and a surface roughness tester. It was noted that the Cr-Co coated pins had experienced significant volume losses almost as high as 300% than that of the Cr-C, at increasing temperatures. This was highly due to the high initial hardness of Cr-C which was about 33% greater than the Cr-Co coatings. A predominant abrasive wear was observed on both coatings with significant size of debris particularly from the Cr-cobalt pins. In short, Cr-C hard coatings are preferable than the Cr-Co based for wear resistant of the combustor liner mating surfaces.
机译：金属上的硬涂层已成功地用于改善燃气轮机的燃烧器衬垫配合表面的耐磨性，从而将寿命从典型的8,000次工作小时延伸至12,000个工作时间。专门在GE帧9E车队中的最大工作温度约为1100°C。在这项工作中，两种类型的硬铬基涂层;选择碳化铬和铬 - 钴，并将空气等离子体喷涂到基于Ni的超合金上，厚度为100.0±25.0μm。在延迟磨损中，使用铬碳化物（Cr-C）和铬 - 钴（Cr-Co）涂层，其均具有很大的硬度。作为主元件的CR，特别是在高温下保护底层基材具有高能力。 CR-C或CR-CO涂层的组合将在高温下延迟表面损坏的发生。在三种不同的操作温度下进行具有引脚配置的干式滑动磨损试验; 25℃（室温），100°C和200°C以研究磨损发生和升高的温度之间的相关性。在低于Ni基超合金（基材）的软化温度下方发现所选温度。通过使用扫描电子图像（SEM），能量分散X射线（EDX）和表面粗糙度测试仪分析包括收集的碎片的涂覆底板的磨损特性。有人指出，Cr-Co涂层销经历了比温度的增加几乎高达300％的显着体积损失。由于Cr-C的高初始硬度，这高度大约是Cr-Co涂层的高度约33％。在两种涂层上观察到具有显着大小的碎屑的涂层上的主要研磨磨损。简而言之，Cr-C硬涂层优于基于燃烧器衬里配合表面的耐磨的CR-Co。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号