Analysis of mullite ablative properties simulated in hypersonic plasma wind tunnel / Análise das propriedades ablativas da mulita simuladas em túnel de vento plasma hipersónico

Cristian Cley Paterniani Rita, Felipe de Souza Miranda, Eduardo Sant'Ana Petraconi Prado, José Rubens Camargo, Felipe Leite Paterniani Rita, Gilberto Petraconi Filho

Abstract


Mullite is a ceramic composed of silicon oxide and aluminum used in various technological applications due to its physical and chemical properties, such as: Low thermal expansion, high thermal stability, low density, low thermal conductivity, good mechanical resistance and creep resistance, good stability in severe chemical environments, among other properties [1]. The supersonic plasma wind tunnel was optimized to investigate the ablative properties of the ceramic composite - Mullite  deposited by the plasma spray process on Carbon - Carbon Substrate (C/C). The tests were performed at low pressure in a reactive air plasma using a DC non-transferred arc plasma torch with enthalpies of 7.2MJ / kg at 18.5MJ / kg and heat fluxes of 0.52 MW/m2 to 2.2 MW/m2 (Fig.1). The specific mass loss rate of the coated Mullite on the (C/C) was evaluated as a function of the exposure time and the heat flow. Microstructural and chemical analysis of the (C/C) substrate of the coated mullite before and after the ablation process through SEM / EDS were also performed. The mullite used in this experiment was processed by the Sol-gel method developed in the materials processing laboratory (PLASMAT-ITA), that is, a process involving a solution that passes through a transition called sol-gel and becomes gel by the and the basic objective of this technique is the preparation of a homogeneous precursor solution from which a semi - rigid gel with level of atomic homogeneity [1]. The synthesis of the mullite is obtained from the mixture in sol-gel of materials that present in its composition . From the synthesis of the Mullite Sol-gel, it was inserted in a Plasma Spray process developed in the Thermal Plasma Laboratory (PLASMAT-ITA), where it was processed the coating of the Mullite in Carbon/Carbon substrate creating a layer of thermal protection on the substrate. The analysis of the obtained results showed that the adhesion of the mullite is directly related to the exposure time of the substrate (C/C) in the plasma spray process, in the formation of the coating as a protective layer, since the analysis of the rate of mass loss and showed that the mullite deposited on the surface of the (C/C) did not show good efficiency when this protective coating was submitted to the ablation process inside the supersonic plasma wind tunnel.

 


Keywords


Plasma Wind Tunnel, Ceramic Composite Coating, Mullite, Hypersonic Flow, Hypersonic Plasma Torch.

References


Aparicio, M., Durán, A., Yttrium Silicate Coatings for Oxidation Protection of Carbon–Silicon Carbide Composites, J. Am. Ceram. Soc., 83 [6] 1351–55 (2000).

Bittencourt, E., Silva, H. P., Machado, H. A., Pesci, P. G. S., Paterniani, C. C., Caliari, F. R., EFFECT OF THE ATMOSPHERE IN THE ABLATION OF CARBON-PHENOLIC COMPOSITES USED IN THERMAL PROTECTION SYSTEMS, 4th Brazilian Conference on Composite Materials. Rio de Janeiro, July 22nd-25th, 2018.

Campos, T.M.B., Thim, G.P., Hirata, C.M., Estudo da Influência do Etilenoglicol na Cristalização da Mulita Obtida por Método Sol-Gel., Tese (2011).

Cividanes, L.S., Campos, T.M.B., Rodrigues, L.A., D.D. Brunelli, G.P. Thim, Review of mullite synthesis routes by sol-gel method, J. Sol-Gel Sci. Technol. 55 (2010) 111–125. doi:10.1007/s10971-010-2222-9.

Hu, C., Niu, Y., Ren, M., Zheng, X., Sun, J., SiC Coatings for Carbon/Carbon Composites Fabricated by Vacuum Plasma Spraying Technology, Journal of Thermal Spray Technology, DOI: 10.1007/s11666-011-9697-y, 2012.

LI, J., YANG, X., SU, Z., XUE, L., ZHONG, P., LI, S., HUANG, Q., LIU, H., Effect of ZrC–SiC content on microstructure and ablation properties of C/C composites, Trans. Nonferrous Met. Soc. China. 26 (2016) 2653–2664. doi:10.1016/S1003-6326(16)64392-3.

Liu, H., Ma, Q., Liu, W., Mechanical and oxidation resistance properties of 3D carbon fiber-reinforced mullite matrix composites prepared by sol–gel process, Ceramics International40(2014)7203–7212.

Machado, H., Simulation of Ablation in a Composite Thermal Protection System via an Interface Tracking Method, J. Aerosp. Technol. Manag., São José dos Campos, Vol.4, No 3, pp. 331-340, Jul.-Sep., 2012.

Machado, H., Simulation of Ablation in a Sounding Rocket Thermal Protection System Via an Interface Tracking Method with Two Moving Fronts, J. Aerosp. Technol. Manag., São José dos Campos, Vol.5, No 4, pp.409-420, Oct.-Dec., 2013.

Miranda, F.S., Caliari, F.R., Campos, T.M., Essiptchouk, A.M., Filho, G.P., Deposition of Graded SiO2/SiC Coatings using High-Velocity Solution Plasma Spray, Ceram. Int. 43 (2017) 16416-16423. Doi: 10.1016/j. ceramint. 2017.09.018.

Pesci, P. G. S., Machado, H. A., Silva, H. P., Rita, C. C. P., Filho, G. P., Botelho, E. C., Numerical-experimental analysis of a carbon-phenolic composite via plasma jet ablation test, Mater. Res. Express 5 (2018) 065601.

Riccio, A. Raimondo, F., Sellito, A., Carandente, R., Tescione, D., Optimum design of ablative thermal protection systems for atmospheric entry vehicles, Applied Thermal Engineering 119 (2017) 541–552.

Zhongliu, W., Peng, X., Zhuan, L., Wen, H., Heng, L., XiaoYu, Y. Yang, L., Microstructure and oxidation behavior of sol–gel mullite coating on SiC-coated carbon/carbon composites, Journal of the European Ceramic Society 35 (2015) 3789–3796.




DOI: https://doi.org/10.34117/bjdv7n9-132

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