TY - JOUR
T1 - R.f. magnetron sputtered iridium coatings on carbon structural materials
AU - Mumtaz, K.
AU - Echigoya, J.
AU - Hirai, T.
AU - Shindo, Y.
N1 - Copyright:
Copyright 2014 Elsevier B.V., All rights reserved.
PY - 1993/8/15
Y1 - 1993/8/15
N2 - R.f. magnetron sputtering was used to produced iridium coatings on carbon-carbon composite and isotropic graphites (coefficient of thermal expansion (CTE) approximately (0.92-7.6) × 10-6 K-1) at room temperature and 1073 K. Sputtered iridium coatings exhibit a homogenous surface irrespective of the deposition temperature. Extremely fine grained columnar structures of iridium were observed when deposited at room temperature. Compared with room temperature deposition, substrate firing at 1073 K produced denser coatings with less strains and larger grain size. Cracking was observed on the coating deposited at 1073 K in the case of c-c composite and isotropic graphite with a thermal expansion coefficient of approximately (0.92-4.8) × 10-6 K-1. For iridium coatings deposited onto isotropic graphite (CTE approximately 7.6 × 10-6 K-1) at 1073 K, after heat treatment at high temperatures in N2, there was no cracking, no outward diffusion of carbon, no dislocations and pores were reduced or eliminated.
AB - R.f. magnetron sputtering was used to produced iridium coatings on carbon-carbon composite and isotropic graphites (coefficient of thermal expansion (CTE) approximately (0.92-7.6) × 10-6 K-1) at room temperature and 1073 K. Sputtered iridium coatings exhibit a homogenous surface irrespective of the deposition temperature. Extremely fine grained columnar structures of iridium were observed when deposited at room temperature. Compared with room temperature deposition, substrate firing at 1073 K produced denser coatings with less strains and larger grain size. Cracking was observed on the coating deposited at 1073 K in the case of c-c composite and isotropic graphite with a thermal expansion coefficient of approximately (0.92-4.8) × 10-6 K-1. For iridium coatings deposited onto isotropic graphite (CTE approximately 7.6 × 10-6 K-1) at 1073 K, after heat treatment at high temperatures in N2, there was no cracking, no outward diffusion of carbon, no dislocations and pores were reduced or eliminated.
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U2 - 10.1016/0921-5093(93)90353-G
DO - 10.1016/0921-5093(93)90353-G
M3 - Article
AN - SCOPUS:0027641141
VL - 167
SP - 187
EP - 195
JO - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
JF - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
SN - 0921-5093
IS - 1-2
ER -