In situ Formation of Oxidation Resistant Refractory Coatings on
‐Reinforced SiC Ultra High Temperature Ceramics
In situ oxidation resistant and solid refractory coatings have been generated on 20 vol%
‐reinforced SiC ultra high temperature ceramics containing 10 wt% rare
earth ( ZrB2 RE) additives such as , LaB6 , and La2O3 fabricated by spark plasma sintering.
Oxidation for 1 h at 1600°C in static air led to formation of a dense layer (up to 250 μm thick) of Gd2O3 and ZrO2 RE‐zirconates on the composite systems underneath which were intermediate layers (50–100 μm)
containing heterogeneous crystalline oxides such as and amorphous silicate phases. The benefits of predominating solid oxidation products over having substantial volumes of liquid present in aerospace leading
edge applications are discussed.
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Document Type: Research Article
Publication date: April 1, 2012