Published January 1989 | Version v1
Journal article Metadata-only

Microstructural aspects of low-pressure plasma-sprayed CoNiCrAlY coating on Hastelloy X

Creators

  • 1. Institute of Materials Science and Engineering, National Sun Yat-sen Univ., Kaohsiung (TW)

Description

A Co-32Ni-21Cr-8Al-0.5Y alloy coating plasma sprayed on Hastelloy X. The microstructure of the coating layer consist of γ phase solid solution, γ' phase, and Y-rich intermetallic phase. This coating exhibits excellent oxidation and sulfidation resistance after exposure in air and in sodium sulfate at 1,0000C for 60 h, due to the formation of α-Al/sub 2/O/sub 3/ oxide scale. However, the presence of chloride in the sodium sulfate leads to rupture of the aluminium oxide scale, and this results in the precipitation of chlorides and sulfides within the coating layer

Additional details

Publishing Information

Journal Title
Metallography
Journal Volume
22
Journal Issue
1
Series
Metallography.
Journal Page Range
57-68
ISSN
0026-0800
CODEN
MEIJA

INIS

Country of Publication
United States
Country of Input or Organization
United States
INIS RN
20067899
Subject category
S36: MATERIALS SCIENCE;
Descriptors DEI
ALUMINIUM ALLOYS; ALUMINIUM OXIDES; CHLORIDES; CHROMIUM ALLOYS; COBALT ALLOYS; INTERMETALLIC COMPOUNDS; LOW PRESSURE; MICROSTRUCTURE; NICKEL ALLOYS; PHASE STUDIES; PLASMA ARC SPRAYING; PRECIPITATION; PROTECTIVE COATINGS; SODIUM SULFATES; SULFIDES; YTTRIUM ALLOYS
Descriptors DEC
ALKALI METAL COMPOUNDS; ALLOYS; ALUMINIUM COMPOUNDS; CHALCOGENIDES; CHLORINE COMPOUNDS; COATINGS; CRYSTAL STRUCTURE; DEPOSITION; HALIDES; HALOGEN COMPOUNDS; OXIDES; OXYGEN COMPOUNDS; SEPARATION PROCESSES; SODIUM COMPOUNDS; SPRAY COATING; SULFATES; SULFUR COMPOUNDS; SURFACE COATING