Analysis of YSZ-Al₂O₃/YSZ Flame Sprayed Thermal Barrier Coating to Thermal Resistance

Abstract:

TBC (Thermal Barrier Coating) with YSZ-Al₂O₃/YSZ as top coat (TC) and MCrAlY alloy as bond coat (BC) marked as YSZ-Al₂O₃/YSZ double layer TBC was used for thermal barrier material on rocket nozzle wall. Several test have been conducted (thermal test and SEM-EDX). Thermal test was divided into two part, Thermal Torch and Non-isothermal Oxidation Test which is used for measure the resistance of TBC structure against oxyacethylene flame penetration as a miniature of thermal static test for rocket nozzle until the specimen was failure and used to measure the resistance against non-isothermal oxidation as well as investigate the growth of TGO (Thermally Grown Oxide) layer on interface between TC/BC for thermal torch and non-isothermal oxidation test respectively. This test was performed at 1100^o C with 10°C/min heating rate. The results showed that the improvement of feed rate on topcoat powder gave the effect on the surface morphology of topcoat. Lower feed rate bring in a coarse surface morphology and tend to be porous. Al₂O₃/YSZ composite layer affect on the growth of TGO layer after thermal test, which indicates the lower growth of TGO especially for 15%Al₂O₃/8YSZ. TGA test showed that the sample began to oxidize at temperature range c.a 1000 – 1030°C, however 1^st derivative analysis indicated that 15% Al₂O₃/8YSZ, 14 g/min was the most stable sampel. Moreover this material has a good resistance from torch destruction.

• Periodical: Advanced Materials Research (Volume 1112)
• Pages: 338-344
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.1112.338
• Online since: July 2015
• Authors: Widyastuti Widyastuti*, Kusriantoko Parindra, Lilis Mariani, Hosta Ardhyananta, Sulistijono Sulistijono
• Keywords: Al₂O₃, Rocket Nozzle, Thermal Barrier Coating, Thermally Grown Oxide, YSZ

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