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In situ Formation of Oxidation Resistant Refractory Coatings on SiC ‐Reinforced ZrB 2 Ultra High Temperature Ceramics
Author(s) -
Jayaseelan Daniel Doni,
ZapataSolvas Eugenio,
Brown Peter,
Lee William E.
Publication year - 2012
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2011.05032.x
Subject(s) - materials science , spark plasma sintering , ceramic , amorphous solid , sintering , composite number , chemical engineering , refractory metals , layer (electronics) , in situ , refractory (planetary science) , silicate , composite material , mineralogy , metallurgy , chemistry , crystallography , engineering , organic chemistry
In situ oxidation resistant and solid refractory coatings have been generated on 20 vol% SiC ‐reinforced ZrB 2 ultra high temperature ceramics containing 10 wt% rare earth ( RE ) additives such as LaB 6 , La 2 O 3 , and Gd 2 O 3 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 ZrO 2 and RE ‐zirconates on the composite systems underneath which were intermediate layers (50–100 μm) containing heterogeneous crystalline oxides such as La 2 Zr 2 O 7 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.