• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>RSC Advances >Preparation and anti-oxidation performance of Al2O3-containing TaSi2–MoSi2–borosilicate glass coating on porous SiCO ceramic composites for thermal protection
【24h】

Preparation and anti-oxidation performance of Al2O3-containing TaSi2–MoSi2–borosilicate glass coating on porous SiCO ceramic composites for thermal protection

机译：多孔SiCO陶瓷复合材料上含Al2O3的TaSi2-MoSi2-硼硅酸盐玻璃涂层的制备及抗氧化性能

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

摘要

In order to improve the thermal oxidation resistance of carbon fiber-reinforced porous silicon oxycarbide (SiCO) ceramic composites, an Al _(2) O _(3) -containing TaSi _(2) –MoSi _(2) –borosilicate glass coating was formed on the surface of the composites via brushing and sintering. The anti-oxidation property of the coated composites at 1873 K was investigated. Microstructures and chemical compositions of the sample before and after anti-oxidation test were determined using XRD, SEM and EDS. After heating in air at 1873 K for 20 min, the Al _(2) O _(3) -containing TaSi _(2) –MoSi _(2) –borosilicate glass coating effectively protects the SiCO ceramic composites and the coated sample kept its appearance well without obvious defects on the surface. The cross-sectional SEM images show that the coating is covered by a film of oxidation products with a thickness of about 40 μm, which is dense and crack free. Inside the A-TMG coating, irregular-shaped silicides are surrounded by continuous borosilicate glass and no penetrating holes or visible cracks are found. Al _(2) O _(3) increases the viscosity of the borosilicate glass, which improves oxidation resistance of the coated sample by enhancing gas-penetration resistance of the glass. In contrast, the sample without Al _(2) O _(3) in the coating slurry is severely oxidized and exhibits lots of open pores on the surface after oxidation test.
机译：为了提高碳纤维增强的多孔碳氧化硅（SiCO）陶瓷复合材料的抗热氧化性能，含Al _（2）O _（3）的TaSi _（2）–MoSi _（2）–硼硅酸盐玻璃涂层通过刷涂和烧结在复合材料的表面上形成α-铁。研究了涂层复合材料在1873 K下的抗氧化性能。使用XRD，SEM和EDS测定了抗氧化试验前后样品的微观结构和化学组成。在1873 K的空气中加热20分钟后，含有Al _（2）O _（3）的TaSi _（2）–MoSi _（2）–硼硅酸盐玻璃涂层有效地保护了SiCO陶瓷复合材料，并且保留了涂层样品外观良好，表面无明显缺陷。横截面SEM图像显示该涂层被氧化产物膜覆盖，该氧化产物膜的厚度为约40μm，该膜致密且无裂纹。在A-TMG涂层内部，不规则形状的硅化物被连续的硼硅酸盐玻璃包围，没有发现任何通孔或可见的裂纹。 Al _（2）O _（3）增大了硼硅酸盐玻璃的粘度，从而通过增强玻璃的抗气体渗透性而提高了涂层样品的抗氧化性。相反，在涂覆浆料中没有Al _（2）O _（3）的样品被严重氧化，并且在氧化试验后表面上显示出许多开孔。

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