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Title: Diffusion welding of silver interlayers coated onto base metals by planar-magnetron sputtering

Abstract

Silver has been coated onto various base metals by planar-magnetron (PM) sputtering to provide interlayers for diffusion welding. The vacuum-coating process consisted of two stages: (1) sputter etching of the base metals to remove surface oxide layers, followed by (2) vapor deposition of high-purity silver onto the clean surfaces. The silvers surfaces were diffusion welded at elevated pressure (207 MPa) and temperatures (483--673 K). The structures of the diffusion-welded-silver interlayer and the as-deposited'' coatings were determined using optical metallography and electron microscopy. The as-deposited structure consists of fine columnar grains {similar to}0.25 {mu}m in diameter, perpendicular to the base-metal surface with the axes of the columns oriented along the (111) crystallographic direction. These grains contain a high density of growth twins {similar to}15 nm thick. The diffusion-welded-silver interlayer consists mostly of large recrystallized grains ({gt}1 mm in diameter) containing a high density of annealing twins. However, a significant amount of the interlayer has not recrystallized. Additionally, the diffusion-welded-silver (silver-silver) interface consists of a high-angle grain boundary often formed between recrystallized and nonrecrystallized regions. For various base metals, the tensile strengths of diffusion-welded-silver joints fabricated using PM sputter deposition were found to be equal to or greater than previously reported strengthsmore » for those fabricated using brazing, electroplating, or other vapor-deposition methods. Tensile properties of diffusion-welded-silver joints fabricated using PM sputter-deposition were also found to be more reproducible than properties previously reported for joints fabricated using hot-hollow cathode (HHC) evaporation.« less

Authors:
;  [1]
  1. Lawrence Livermore National Laboratory, Livermore, California 94550 (US)
Publication Date:
OSTI Identifier:
6986125
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Journal Article
Journal Name:
Journal of Vacuum Science and Technology, A (Vacuum, Surfaces and Films); (USA)
Additional Journal Information:
Journal Volume: 8:1; Journal ID: ISSN 0734-2101
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; SILVER; DIFFUSION WELDING; VAPOR DEPOSITED COATINGS; BRAZING; ELECTROPLATING; ETCHING; HIGH TEMPERATURE; MAGNETRONS; METALLOGRAPHY; RECRYSTALLIZATION; SPUTTERING; TRANSMISSION ELECTRON MICROSCOPY; VACUUM EVAPORATION; VACUUM SYSTEMS; COATINGS; DEPOSITION; ELECTRODEPOSITION; ELECTROLYSIS; ELECTRON MICROSCOPY; ELECTRON TUBES; ELECTRONIC EQUIPMENT; ELEMENTS; EQUIPMENT; EVAPORATION; FABRICATION; JOINING; LYSIS; METALS; MICROSCOPY; MICROWAVE EQUIPMENT; MICROWAVE TUBES; PHASE TRANSFORMATIONS; PLATING; SURFACE COATING; SURFACE FINISHING; TRANSITION ELEMENTS; WELDING; 360601* - Other Materials- Preparation & Manufacture

Citation Formats

Rosen, R S, and Kassner, M E. Diffusion welding of silver interlayers coated onto base metals by planar-magnetron sputtering. United States: N. p., 1990. Web. doi:10.1116/1.577064.
Rosen, R S, & Kassner, M E. Diffusion welding of silver interlayers coated onto base metals by planar-magnetron sputtering. United States. https://doi.org/10.1116/1.577064
Rosen, R S, and Kassner, M E. Mon . "Diffusion welding of silver interlayers coated onto base metals by planar-magnetron sputtering". United States. https://doi.org/10.1116/1.577064.
@article{osti_6986125,
title = {Diffusion welding of silver interlayers coated onto base metals by planar-magnetron sputtering},
author = {Rosen, R S and Kassner, M E},
abstractNote = {Silver has been coated onto various base metals by planar-magnetron (PM) sputtering to provide interlayers for diffusion welding. The vacuum-coating process consisted of two stages: (1) sputter etching of the base metals to remove surface oxide layers, followed by (2) vapor deposition of high-purity silver onto the clean surfaces. The silvers surfaces were diffusion welded at elevated pressure (207 MPa) and temperatures (483--673 K). The structures of the diffusion-welded-silver interlayer and the as-deposited'' coatings were determined using optical metallography and electron microscopy. The as-deposited structure consists of fine columnar grains {similar to}0.25 {mu}m in diameter, perpendicular to the base-metal surface with the axes of the columns oriented along the (111) crystallographic direction. These grains contain a high density of growth twins {similar to}15 nm thick. The diffusion-welded-silver interlayer consists mostly of large recrystallized grains ({gt}1 mm in diameter) containing a high density of annealing twins. However, a significant amount of the interlayer has not recrystallized. Additionally, the diffusion-welded-silver (silver-silver) interface consists of a high-angle grain boundary often formed between recrystallized and nonrecrystallized regions. For various base metals, the tensile strengths of diffusion-welded-silver joints fabricated using PM sputter deposition were found to be equal to or greater than previously reported strengths for those fabricated using brazing, electroplating, or other vapor-deposition methods. Tensile properties of diffusion-welded-silver joints fabricated using PM sputter-deposition were also found to be more reproducible than properties previously reported for joints fabricated using hot-hollow cathode (HHC) evaporation.},
doi = {10.1116/1.577064},
url = {https://www.osti.gov/biblio/6986125}, journal = {Journal of Vacuum Science and Technology, A (Vacuum, Surfaces and Films); (USA)},
issn = {0734-2101},
number = ,
volume = 8:1,
place = {United States},
year = {1990},
month = {1}
}