...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Thin Solid Films >Laser cladding of high performance ceramic sheets on a low quality ceramic substrate
【24h】

Laser cladding of high performance ceramic sheets on a low quality ceramic substrate

机译：在低品质陶瓷基板上激光熔覆高性能陶瓷片

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

High alumina refractory ceramics offer increased resistance in slagging environments. In particular, the presence of more than 5% Cr_2O_3 in a high alumina refractory ceramic increases its slag corrosion resistance due to the formation of a dense Cr-spinel oxide layer at the refractory/slag interface. However, refractory ceramics containing more that 5% Cr_2O_3 cost significantly more than Cr_2O_3-free refractory ceramics. The surface and near-surface compositions and properties are more important than the bulk properties for high-temperature applications in slag-containing environments. Laser cladding, therefore, is a useful tool for developing refractory ceramics with a low-cost substrate and a high slag-corrosion resistant surface layer. This paper presents a technique involving cladding of pre-positioned layers of a 85% Al_2O_3-5% Cr_2O_3 ceramic on a 60% A12O3 refractory ceramic, focusing on the process characteristics. A simple model that describes the process of multi-sheet cladding is developed and the operating map for the process is presented. The microstructural characteristics of the clad surfaces have been analysed by optical and scanning electron microscopy (SEM), as well as energy dispersion X-ray spectroscopy (EDX), revealing the formation of an intermediate layer between the substrate and the top ceramic sheets in multi-sheet cladding. A bi-phasic structure is formed in the clad surface, comprising of an Al_2O_3-Cr_2O_3-based solid solution and a SiO_2-based matrix.
机译：高铝质耐火陶瓷在结渣环境中具有更高的抵抗力。特别地，由于在耐火材料/炉渣界面处形成致密的Cr-尖晶石氧化物层，因此在高铝耐火陶瓷中存在超过5％的Cr_2O_3可以提高其耐渣腐蚀性。但是，含有5％以上Cr_2O_3的耐火陶瓷的成本明显高于不含Cr_2O_3的耐火陶瓷。对于含矿渣环境中的高温应用，表面和近表面的成分和性能比整体性能更为重要。因此，激光熔覆是用于开发具有低成本基底和高抗渣腐蚀表面层的耐火陶瓷的有用工具。本文介绍了一种涉及在60％的Al2O3耐火陶瓷上包覆85％的Al_2O_3-5％Cr_2O_3陶瓷的预定层的技术。开发了一个描述多页熔覆过程的简单模型，并给出了该过程的操作图。已通过光学和扫描电子显微镜（SEM）以及能量色散X射线光谱（EDX）分析了包层表面的微观结构特征，揭示了基材和顶部陶瓷片之间形成了中间层板覆层。在包层表面中形成两相结构，其包括基于Al_2O_3-Cr_2O_3-的固溶体和基于SiO_2的基体。

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