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Title: Microstructural and Mechanical Characterization of Actively Brazed Alumina Specimens

Abstract

Alumina (94 and 99.8% grade compositions) was brazed directly to itself with gold-based active brazing alloys (ABA's) containing vanadium additions of 1,2 and 3 weight percent. The effects of brazing conditions on the joint properties were investigated. Wetting behavior, interfacial reactions, microstructure, hermeticity and tensile strength were determined. Wetting was fair to good for the ABA and base material combinations. Microanalysis identified a discontinuous Al-V-O spinel reaction product at the alumina-braze interface. Tensile strength results for 94% alumina were uniformly good and generally not sensitive to the vanadium concentration, with tensile values of 85-105 MPa. There was more variability in the 99.8% alumina strength results, with values ranging from 25-95 MPa. The highest vanadium concentration (3 wt. %) yielded the highest joint strength for the brazed 99.8% alumina. Failures in the 99.8% alumina samples occurred at the braze-alumina interface, while the 94% alumina specimens exhibited fracture of the ceramic substrate.

Authors:
; ; ; ; ; ;
Publication Date:
Research Org.:
Sandia National Labs., Albuquerque, NM (US); Sandia National Labs., Livermore, CA (US)
Sponsoring Org.:
US Department of Energy (US)
OSTI Identifier:
10358
Report Number(s):
SAND99-2201J
TRN: AH200125%%374
DOE Contract Number:  
AC04-94AL85000
Resource Type:
Journal Article
Journal Name:
Welding Journal Research Supplement
Additional Journal Information:
Other Information: Submitted to Welding Journal Research Supplement; PBD: 26 Aug 1999
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; BRAZING; BRAZING ALLOYS; CERAMICS; FRACTURES; MICROANALYSIS; MICROSTRUCTURE; SPINELS; TENSILE PROPERTIES; VANADIUM; VANADIUM ADDITIONS

Citation Formats

Hosking, F.M., Cadden, C.H., Stephens, J.J., Glass, S.J., Yang, N.Y.C., Vianco, P.V., and Walker, C.A. Microstructural and Mechanical Characterization of Actively Brazed Alumina Specimens. United States: N. p., 1999. Web.
Hosking, F.M., Cadden, C.H., Stephens, J.J., Glass, S.J., Yang, N.Y.C., Vianco, P.V., & Walker, C.A. Microstructural and Mechanical Characterization of Actively Brazed Alumina Specimens. United States.
Hosking, F.M., Cadden, C.H., Stephens, J.J., Glass, S.J., Yang, N.Y.C., Vianco, P.V., and Walker, C.A. Thu . "Microstructural and Mechanical Characterization of Actively Brazed Alumina Specimens". United States. https://www.osti.gov/servlets/purl/10358.
@article{osti_10358,
title = {Microstructural and Mechanical Characterization of Actively Brazed Alumina Specimens},
author = {Hosking, F.M. and Cadden, C.H. and Stephens, J.J. and Glass, S.J. and Yang, N.Y.C. and Vianco, P.V. and Walker, C.A.},
abstractNote = {Alumina (94 and 99.8% grade compositions) was brazed directly to itself with gold-based active brazing alloys (ABA's) containing vanadium additions of 1,2 and 3 weight percent. The effects of brazing conditions on the joint properties were investigated. Wetting behavior, interfacial reactions, microstructure, hermeticity and tensile strength were determined. Wetting was fair to good for the ABA and base material combinations. Microanalysis identified a discontinuous Al-V-O spinel reaction product at the alumina-braze interface. Tensile strength results for 94% alumina were uniformly good and generally not sensitive to the vanadium concentration, with tensile values of 85-105 MPa. There was more variability in the 99.8% alumina strength results, with values ranging from 25-95 MPa. The highest vanadium concentration (3 wt. %) yielded the highest joint strength for the brazed 99.8% alumina. Failures in the 99.8% alumina samples occurred at the braze-alumina interface, while the 94% alumina specimens exhibited fracture of the ceramic substrate.},
doi = {},
journal = {Welding Journal Research Supplement},
number = ,
volume = ,
place = {United States},
year = {1999},
month = {8}
}