TY - JOUR
T1 - Effects of Thin Mullite Coating on the Environmental Stability of Sintered Si3N4
AU - Tsarenko, Irina
AU - Du, Henry H.
AU - Lee, Woo Y.
PY - 2004/3
Y1 - 2004/3
N2 - We investigated the effects of a chemically-vapor-deposited mullite coating (∼100 nm) on the oxidation resistance of sintered Si3N 4 in air and steam environments. The coating was sacrificially incorporated into the thermally grown oxide (TGO) on Si3N4 during isothermal oxidation in air at 1400°C, leading to significantly reduced TGO growth as well as markedly improved TGO morphology. This improvement can be attributed to the refractory and viscous nature of the SiO 2-Al2O3 system, compared with SiO2, when under the influence of alkali and/or alkaline-earth fluxing elements. However, the mullite coating had little effect on the stability of the ceramic in the steam environment at 1200°C, due likely to high activity of SiO 2 in mullite.
AB - We investigated the effects of a chemically-vapor-deposited mullite coating (∼100 nm) on the oxidation resistance of sintered Si3N 4 in air and steam environments. The coating was sacrificially incorporated into the thermally grown oxide (TGO) on Si3N4 during isothermal oxidation in air at 1400°C, leading to significantly reduced TGO growth as well as markedly improved TGO morphology. This improvement can be attributed to the refractory and viscous nature of the SiO 2-Al2O3 system, compared with SiO2, when under the influence of alkali and/or alkaline-earth fluxing elements. However, the mullite coating had little effect on the stability of the ceramic in the steam environment at 1200°C, due likely to high activity of SiO 2 in mullite.
UR - http://www.scopus.com/inward/record.url?scp=1842686817&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=1842686817&partnerID=8YFLogxK
U2 - 10.1111/j.1551-2916.2004.00417.x
DO - 10.1111/j.1551-2916.2004.00417.x
M3 - Article
AN - SCOPUS:1842686817
SN - 0002-7820
VL - 87
SP - 417
EP - 420
JO - Journal of the American Ceramic Society
JF - Journal of the American Ceramic Society
IS - 3
ER -