Oxidation protective ZrB2-SiC coatings with ferrocene addition on SiC coated graphite

In order to further improve the oxidation protective ability of (ZrB2-SiC)/SiC coated graphite, ferrocene was introduced into the outer ZrB2-SiC coatings during pack cementation process. The ferrocene addition increased the porosity of the outer ZrB2-SiC coatings, which was favorable to thermal shock resistance of (ZrB2-SiC)/SiC coated specimens. The ZrB2-SiC coating with 3 wt% ferrocene (ZS50-3f) has optimum oxidation protective ability. Its weight retention after 15 thermal shock cycles between 1500 degrees C and room temperature was 96. 2%. The weight loss of ZS50-3f was only 0.2% after 19 h oxidation at 1500 degrees C. (C) 2015 Elsevier Ltd and Techna Group S.r.l. All rights reserved.