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Wetting and Mechanical Performance of Zirconia Brazed with Silver/Copper Oxide and Silver/Vanadium Oxide Alloys
Author(s) -
Sinnamon Kathleen E.,
Meier Alan M.,
Joshi Vineet V.
Publication year - 2014
Publication title -
advanced engineering materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.938
H-Index - 114
eISSN - 1527-2648
pISSN - 1438-1656
DOI - 10.1002/adem.201400104
Subject(s) - materials science , brazing , oxide , wetting , flexural strength , cubic zirconia , copper , metallurgy , yttria stabilized zirconia , composite material , ceramic , vanadium , alloy
The wetting behavior and mechanical strength of silver/copper oxide and silver/vanadium oxide braze alloys were investigated for both magnesia‐stabilized and yttria‐stabilized (Mg‐PSZ and Y‐TZP) transformation toughened zirconia substrates. The temperatures investigated were 1000–1100 °C, with oxide additions of 1–10 wt% V 2 O 5 or CuO, and hold times of 0.9–3.6 ks. Increasing either the isothermal hold temperature or time had a distinctly negative effect on the joint strength. The maximum strengths for both braze alloys were obtained for 5 wt% oxide additions at 1050 °C with a hold time of 0.9 ks. The Mg‐PSZ/Ag‐CuO system exhibited a average fracture strength of 255 MPa (45% of the reported monolithic strength), and the Y‐TZP/Ag‐CuO system had an average fracture strength of 540 MPa (35% of the reported monolithic strength). The fracture strengths were lower for the Ag‐V 2 O 5 braze alloys, with fracture strengths of approximately 180 MPa (30% of the monolithic strength) for Mg‐PSZ versus approximately 160 MPa (10% of the monolithic strength) for Y‐TZP. The fracture always occurred at the braze–ceramic interface. No interfacial products were observed in low magnification SEM analysis for the brazing alloys containing V 2 O 5 additions, while there were interfacial products present for brazes prepared with CuO additions in the braze alloy.