Effects of in situ synthesized mullite whiskers on compressive strength of mullite fiber brick |
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| Affiliation: | 1. College of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, China;2. Joining and Welding Research Institute, Osaka University, 11-1 Mihogaoka, Ibaraki, Osaka 567-0047, Japan;1. Department of Mechanical Engineering, State University of Santa Cruz, Ilhéus, Bahia, Brazil;2. Diffusion in Materials Laboratory, Department of physics, Federal University of Ouro Preto, Ouro Preto, MG, Brazil;1. College of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, China;2. Joining and Welding Research Institute, Osaka University, 11-1 Mihogaoka, Ibaraki, Osaka 567-0047, Japan;1. National Engineering Research Center for Domestic & Builing Ceramics, Jingdezhen Ceramic Institute, Jingdezhen 333000, China;2. Department of Material Science and Engineering, Jingdezhen Ceramic Institute, Jingdezhen 333000, China;1. Department of Materials Science and Engineering, Northwestern Polytechnical University, Xi''an 710072, China;2. Department of Materials Science and Engineering, Shaanxi University of Science and Technology, Xi''an 710021, China;1. CAS Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, PR China;2. Ningbo Urban Environment Observation and Research Station—NUEORS, Chinese Academy of Sciences, PR China;3. Materials and Surface Science Institute (MSSI), University of Limerick (UL), Limerick, Ireland;4. Institut Europeen des Membranes, UMR 5635, Place Eugene Bataillon, 34095 Montpellier Cedex 5, France;5. Inorganic Membranes, MESA+ Institute for Nanotechnology, University of Twente, PO Box 217, 7500AE Enschede, The Netherlands |
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| Abstract: | The method of in situ synthesis of mullite whiskers by gas-phase deposition and reaction was applied to improve the compressive strength of the mullite fiber brick. During the preparation process, silica sol, Al(NO3)3 solution and NH4F solution were introduced into the fibrous brick in the form of ions or sol through vacuum impregnation and freeze drying, and the silica sol, Al(NO3)3 and NH4F served as the silica sources, aluminum source and catalyst, respectively. Effects of process parameters (concentration of impregnation solutions, holding time, sintering temperature) on compressive strength and elastic modulus of the fibrous brick during the in situ toughening process were analyzed. SEM and XRD analysis results demonstrated that the mullite whiskers were synthesized on the surface of mullite fibers based on the reaction of AlOF and SiF4. What is more, the whiskers on adjacent fibers intersected with each other and formed many unfixed lap-jointing points, resulting in the increase of compressive strength and elastic modulus. Although the density and thermal conductivity of the sample after the generation of mullite whiskers fabricated with the optimum process were 0.406 g/cm3 and 0.1262 W/(m K), respectively, which were slightly higher than that of the raw fibrous brick (0.375 g/cm3 density and 0.1069 W/(m K) thermal conductivity, respectively), the corresponding compressive strength and elastic modulus of the sample reinforced with the whiskers increased to 1.45 MPa and 42.03 MPa, respectively, which were much higher than that of the raw fibrous brick (0.39 MPa compressive strength and 6.5 MPa elastic modulus). |
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| Keywords: | B Whiskers C Strength D Mullite Fibrous brick |
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