Morphology of Gold and Copper Ion-Plated Coatings
Abstract
Copper and gold films (0. 2 to 2 micron thick) were ion plated onto polished 304-stainless-steel, glass, and mica surfaces. These coatings were examined by SEM for defects in their morphological growth. Three types of defects were distinguished: nodular growth, abnormal or runaway growth, and spits. The cause for each type of defect was investigated. Nodular growth is due to inherent substrate microdefects, abnormal or runaway growth is due to external surface inclusions, and spits are due to nonuniform evaporation (ejection of droplets). All these defects induce stresses and produce porosity in the coatings and thus weaken their mechanical properties. During surface rubbing, large nodules are pulled out, leaving vacancies in the coatings.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 1978
- Accession Number
- ADA330159
Entities
People
- Talivaldis Spalvins
Organizations
- Glenn Research Center