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陶瓷纤维织物表面TaSi2-SiC高发射率涂层的制备及性能研究
Preparation and Properties of TaSi2-SiC High Emissivity Coating on Ceramic Fiber Fabric
  
DOI:
中文关键词:  陶瓷纤维织物  高发射率涂层  TaSi2  力学性能
英文关键词:Ceramic fiber fabric  High emissivity coating  TaSi2  Mechanical property
基金项目:
作者单位
高琪超,郭安然,杜海燕,刘家臣 天津大学材料科学与工程学院先进陶瓷与加工技术教育部重点实验室天津 300072 
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中文摘要:
      陶瓷纤维柔性隔热毡表面红外辐射能力较弱并且长时间在高温环境下服役纤维易发生析晶失效。针对上述问题,本文在柔性隔热毡表面制备了双组分TaSi2-SiC高发射率涂层,以提高隔热毡的耐温性能。相较于单组分的SiC涂层而言,室温下的双组分TaSi2-SiC涂层表面结构连续且均匀,并且TaSi2的引入有利于促进涂层高温烧结,提高涂层表面的致密性,阻挡外界热量进入纤维基体内部。双组分T3S1(发射剂TaSi2:SiC质量比为3:1)涂层纤维织物经1100℃热处理后仍有较高的拉伸强度约为85MPa,相较于同等条件下的纤维裸布高出19%。此外,涂层中TaSi2与SiC形成协同机制,促进了短波段的红外吸收,明显提高了纤维织物在2~6μm短波段的发射率,T3S1双组分涂层纤维织物在此波长范围内的发射率高达0.955。
英文摘要:
      The infrared radiation ability of ceramic fiber flexible insulated mat was weak and the fibers was prone to crystallization failure when it was served at high temperature for a long time. To solve the above problems, a double-component TaSi2-SiC high emissivity coating was prepared on the surface of the flexible thermal insulation felt in order to improve its temperature resistance. Compared with the single-component SiC coating, the surface structure of double-component TaSi2-SiC coating at room temperature was continuous and uniform, and the introduction of TaSi2 was beneficial to promote the sintering of the coating at high temperature, improve the density of the coating surface, and prevent the heat from entering the fiber matrix. When the mass ratio of the emittance was TaSi2:SiC=3:1, the tensile strength of the T3S1-coated fiber fabric after heat treatment at 1100°C was about 85 MPa, 19% higher than that of the fiber bare fabric under the same condition. In addition, a synergistic mechanism between TaSi2 and SiC was formed in the coating, which promoted the infrared absorption of the short-wave band, and significantly improved the emissivity of the fiber fabric at 2~6 μm short wavelength range. The emissivity of the fiber fabric with T3S1 double-component coating was up to 0.955 in this wavelength range.
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