skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Brazing titanium-vapor-coated zirconia

Abstract

Partially stabilized zirconia was vacuum furnace brazed to itself, to nodular cast iron, and to commercially pure titanium with a Ag-30Cu-10Sn wt% filler metal. Wetting was obtained by coating the ZrO[sub 2] surfaces with Ti prior to brazing by RF sputtering or electron beam evaporation. Braze joints made with Ti-sputter-coated ZrO[sub 2] contained high levels of porosity, but those made with Ti coatings deposited by evaporation, referred to as Ti-vapor-coated, contained little or no porosity. Brazing caused the ZrO[sub 2] within about 1 mm (0.04 in.) of the joint surfaces to turn black in color, and thermodynamic analysis indicated that the discoloration was likely due to oxygen diffusion out of the ZrO[sub 2] into the Ti vapor coating during brazing. Braze joint strength was determined by flexure testing in the four-point bend arrangement, and on a more limited basis, by shear testing. The latter method was used mainly as a screening test for ZrO[sub 2]-Fe and ZrO[sub 2]-Ti joints. Flexure testing of ZrO[sub 2]-ZrO[sub 2] and ZrO[sub 2]-Fe braze joints was done at 25, 200, 400, and 575 C (77, 392, 752 and 1,067 F) in air. For flexure testing, average strengths of joint specimens decreased with increasing test temperature.more » The lower average strengths of ZrO[sub 2]-Fe specimens compared to those from ZrO[sub 2]-ZrO[sub 2] joints was attributed to higher residual stresses in the ceramic-to-metal joints.« less

Authors:
 [1];  [2]
  1. Oak Ridge National Lab., TN (United States)
  2. Pohang Steel Co. (Korea, Republic of)
Publication Date:
OSTI Identifier:
6518840
Resource Type:
Journal Article
Journal Name:
Welding Journal (Miami); (United States)
Additional Journal Information:
Journal Volume: 72:4; Journal ID: ISSN 0043-2296
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; BRAZED JOINTS; MECHANICAL PROPERTIES; ZIRCONIUM OXIDES; BRAZING; BRAZING ALLOYS; FRACTURE PROPERTIES; IRON; MICROSTRUCTURE; POROSITY; SPUTTERING; TITANIUM; VAPOR DEPOSITED COATINGS; WETTING AGENTS; ALLOYS; CHALCOGENIDES; COATINGS; CRYSTAL STRUCTURE; ELEMENTS; FABRICATION; JOINING; JOINTS; METALS; OXIDES; OXYGEN COMPOUNDS; SURFACTANTS; TRANSITION ELEMENT COMPOUNDS; TRANSITION ELEMENTS; WELDED JOINTS; WELDING; ZIRCONIUM COMPOUNDS; 360201* - Ceramics, Cermets, & Refractories- Preparation & Fabrication; 360203 - Ceramics, Cermets, & Refractories- Mechanical Properties

Citation Formats

Santella, M L, and Pak, J J. Brazing titanium-vapor-coated zirconia. United States: N. p., 1993. Web.
Santella, M L, & Pak, J J. Brazing titanium-vapor-coated zirconia. United States.
Santella, M L, and Pak, J J. 1993. "Brazing titanium-vapor-coated zirconia". United States.
@article{osti_6518840,
title = {Brazing titanium-vapor-coated zirconia},
author = {Santella, M L and Pak, J J},
abstractNote = {Partially stabilized zirconia was vacuum furnace brazed to itself, to nodular cast iron, and to commercially pure titanium with a Ag-30Cu-10Sn wt% filler metal. Wetting was obtained by coating the ZrO[sub 2] surfaces with Ti prior to brazing by RF sputtering or electron beam evaporation. Braze joints made with Ti-sputter-coated ZrO[sub 2] contained high levels of porosity, but those made with Ti coatings deposited by evaporation, referred to as Ti-vapor-coated, contained little or no porosity. Brazing caused the ZrO[sub 2] within about 1 mm (0.04 in.) of the joint surfaces to turn black in color, and thermodynamic analysis indicated that the discoloration was likely due to oxygen diffusion out of the ZrO[sub 2] into the Ti vapor coating during brazing. Braze joint strength was determined by flexure testing in the four-point bend arrangement, and on a more limited basis, by shear testing. The latter method was used mainly as a screening test for ZrO[sub 2]-Fe and ZrO[sub 2]-Ti joints. Flexure testing of ZrO[sub 2]-ZrO[sub 2] and ZrO[sub 2]-Fe braze joints was done at 25, 200, 400, and 575 C (77, 392, 752 and 1,067 F) in air. For flexure testing, average strengths of joint specimens decreased with increasing test temperature. The lower average strengths of ZrO[sub 2]-Fe specimens compared to those from ZrO[sub 2]-ZrO[sub 2] joints was attributed to higher residual stresses in the ceramic-to-metal joints.},
doi = {},
url = {https://www.osti.gov/biblio/6518840}, journal = {Welding Journal (Miami); (United States)},
issn = {0043-2296},
number = ,
volume = 72:4,
place = {United States},
year = {Thu Apr 01 00:00:00 EST 1993},
month = {Thu Apr 01 00:00:00 EST 1993}
}