Iranian Journal of Materials Science and Engineering

en Fabrication, Microstructural Characterization, and Ablation Behavior of a Novel 3D Orthogonal Woven C/C-SiC-ZrB2 Composite Through I-CVI, SI, and LSI Combined Processes گروه سرامیک Ceramic Materials and Engineering Research Paper Research Paper This paper presents the novel fabrication method of a three-dimensional orthogonally woven (3DW) C/C-SiC-<a name="_Hlk174929800">Zr</a><a name="_Hlk174922619">B2</a> composite and the effects of ZrB2 and SiC particles on microstructure and the ablation behavior of the C/C–SiC–ZrB2 composite are studied. C/C–SiC–ZrB2 composite was prepared by isothermal-chemical vapor infiltration (I-CVI), slurry infiltration (SI), and <a name="_Hlk170974452">liquid silicon infiltration (LSI) </a>combined process. Pyrolytic carbon (PyC) was first infused into the 3DW preform by I-CVI at 1050°C using CH4 as a precursor in order to form a C/C preform with <a name="_Hlk174658208">porous</a> media. The next step was graphitization at 2400°C for 1hr. Then  <a name="_Hlk155903254">ZrB2 </a>was introduced into 3DW C/C preform with a void percentage of 48 by impregnating the mixture of ZrB2 and phenolic resin, followed by a pyrolysis step at 1050°C. A liquid Si alloy was infiltrated, at 1650 °C, into the 3DW C/C composites porous media containing the ZrB2 particles to form a SiC–ZrB2 matrix. <a name="_Hlk174665004">An oxyacetylene torch flame</a> was utilized to investigate The ablation behavior. ZrB2 particles, along with the SiC matrix situated between carbon fiber bundles, form a compact ZrO2-SiO2 layer. This layer acts as a barrier, restricting oxygen infiltration into the composite and reducing the erosion of carbon fibers. The findings were supported by FESEM imaging and further confirmed through x-ray diffraction and EDS analysis. The addition of ZrB2 to the C/C-SiC composite resulted in a lower mass and linear ablation rate; 2.20 mg/s and 1.4 µm/s respectively while those for C/C-SiC composite were 4.8 mg/s and 6.75 µm/s after ablation under an oxyacetylene flame (2500°C) for 120 s.   three-dimensional orthogonal woven preform,liquid silicon infiltration,ceramic-matrix composite,C/C–SiC–ZrB2 composite,ablation resistance 66 77 http://ijmse.iust.ac.ir/browse.php?a_code=A-10-5615-1&slc_lang=en&sid=1 Amin Rezaei Chekani amin.rezaei133@gmail.com 1800319475328460021120 1800319475328460021120 No Department of Materials and Metallurgical Engineering, Amirkabir University of Technology IR 1591634311 Tehran, Iran malek naderi mnaderi@aut.ac.ir 1800319475328460021121 1800319475328460021121 Yes Department of Materials and Metallurgical Engineering, Amirkabir University of Technology , IR 1591634311 Tehran, Iran/ Graphene and Advanced Materials Laboratory (GAMLab), Innovation tower of Amirkabir University of Technology (Tehran Polytechnic), Phone (+98) 21 6454 5423, info@gamlab.aut.ac.ir reza aliasgarian aliasgarian@aut.ac.ir 1800319475328460021122 1800319475328460021122 No Department of Materials and Metallurgical Engineering, Amirkabir University of Technology, IR 1591634311 Tehran, Iran yousef Safaei-Naeini yousef.Safaei@gmail.com 1800319475328460021123 1800319475328460021123 No Isfahan University of Technology Faculty of Material Engineering, Isfahan Province, IR 8415683111