Mechanical behavior of segmented oxide protected coatings

Conference · Tue Apr 01 00:00:00 EST 1980

OSTI ID:5682085

Patten, J W; Prater, J T; Hays, D D; Moss, R W

Mechanically and thermally induced fractures were examined in sputtered coatings consisting of a NiCrAlY underlayer, either a thin or a thick transition layer graded from NiCrAlY to ZrO/sub 2/, and an outer ZrO/sub 2/ layer. A pronounced columnar (fibrous) microstructure was obtained, although the columnar boundaries in the ZrO/sub 2/ layers and in the thick transition layers were much more open than in the NiCrAlY, effectively producing a more segmented structure. Fractures in the coatings with thick transition layers always followed the columnar boundaries and did not affect coating adherence. Fractures in the coatings with thin transition layers were similar except that fractures in the transition layer and parallel to the layer plane were observed in addition to the columnar fractures and would be expected to result in loss of coating adherence.

• Research Organization: Pacific Northwest Lab., Richland, WA (USA)
• DOE Contract Number: AC06-76RL01830
• OSTI ID: 5682085
• Report Number(s): PNL-SA-8138; CONF-800439-15; ON: DE82010662
• Resource Relation: Conference: International conference on metallurgical coatings, San Diego, CA, USA, 21 Apr 1980
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM ALLOYS
SURFACE COATING
CHROMIUM ALLOYS
NICKEL ALLOYS
YTTRIUM ALLOYS
ZIRCONIUM OXIDES
ADHESION
FRACTURES
SURFACE PROPERTIES
ALLOYS
CHALCOGENIDES
DEPOSITION
FAILURES
OXIDES
OXYGEN COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
ZIRCONIUM COMPOUNDS
360203* - Ceramics
Cermets
& Refractories- Mechanical Properties
360103 - Metals & Alloys- Mechanical Properties