Reaction layer characterization of the braze joint of silicon nitride to stainless steel

Xu, Runshen; Indacochea, J. E.

doi:10.1007/bf02645257

Cited by 6 publications

(3 citation statements)

References 21 publications

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“…The initial microstructure of the braze alloy CB4 (Fig. 1) consists of an Ag-rich matrix, Cu-rich inclusions (both structures are FCC), and coppertitanium intermetallics, usually associated only with a Cu-rich phase, as was reported in the previous works [6][7][8][9]. Compositionally, when converted to atomic concentrations, this alloy has the stoichiometry Ag 57.5 Cu 37 Ti 5.5 , which could be considered as an Ag 60 Cu 40 eutectic modified with 5.5 at.% of titanium.…”

Section: Methodssupporting

confidence: 55%

“…Firstly, at low temperatures the third equilibrium phase besides the Ag-and Cu-based solid solutions is Cu 4 Ti. The presence of Cu 3 Ti 2 phase in the analysis of the as-received CB4 alloy reported earlier [7] Secondly, the solidus point is located higher than the AgCu eutectic (779 °C). This is because titanium is present in the FCC copper solid solution.…”

Section: Melting At the Solidus Pointsupporting

confidence: 49%

“…Though in this study we do not emphasize on our experimental findings, we still have to give some details of our practical work in order to correctly apply the theory to the experiment. In our studies on joining Y 2 O 3 -to-Y 2 O 3 , Y 2 O 3 -to-Zr, Zr-to-Zr, Si 3 N 4 -to-(410 type stainless steel) we used the commercially available active filler metal Ag70.5Cu26.5Ti3 (wt.%), known as CB4 [6][7][8][9]. Usually, our samples for brazing were made as round sandwiches with a piece of 0.13 mm thick braze alloy foil inserted between the pieces of the brazed materials.…”

Section: Methodsmentioning

confidence: 99%

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Phase transformations in Ag70.5Cu26.5Ti3 filler alloy during brazing processes

Hirnyj¹,

Indacochea²

2008

Chem. Met. Alloys

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Phase transformations that occur in the brazing alloy Ag70.5Cu26.5Ti3 are described. The liquid segregation paths and the liquid composition path are presented. The evolution of the liquid and the concentration of titanium in the liquid are plotted versus temperature. With increasing temperature the activity of titanium in the liquid increases and is sufficient for reactive brazing even before the alloy is completely melted and liquid is segregated. In the liquid, copper suppresses the activity of titanium while silver enhances it. The activities of titanium in both segregated liquids are identical, though the concentrations are very different. Thus, both liquids-Ag-Cu-rich L1 and Cu-Ti-rich L2-are equally reactive and responsible for wetting and spreading, not just L2, as often believed. The major differences (including gravimetric) between L1 and L2 and the effect of preferential segregation of Ag to the free surface of the liquid on surface tension are discussed.

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Section: Methodssupporting

confidence: 55%

Section: Melting At the Solidus Pointsupporting

confidence: 49%

Section: Methodsmentioning

confidence: 99%

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Phase transformations in Ag70.5Cu26.5Ti3 filler alloy during brazing processes

Hirnyj¹,

Indacochea²

2008

Chem. Met. Alloys

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Brazing of zirconia with AgCuTi and SnAgTi active filler metals

Chuang

Yeh

Chai³

2000

Metall Mater Trans A

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The self-brazing of partially stabilized zirconia using Ag27Cu3Ti and Sn10Ag4Ti active filler metals is investigated. It was shown that the contact angles of Ag27Cu3Ti and Sn10Ag4Ti on zirconia decreased with the increase of brazing temperature and remained constant at about 34 deg and 44 deg above 900 ЊC, respectively. The flexural strengths were 227 and 137 MPa for ZrO 2 /Ag27Cu3Ti/ ZrO 2 and ZrO 2 /Sn10Ag4Ti/ZrO 2 , respectively, after brazing at 900 ЊC for 10 minutes.In these brazing systems, the titanium in the filler metals segregated at the interface and formed a TiO reaction layer responsible for the wetting and bonding when a ZrO 2 ceramic is brazed with Ag27Cu3Ti and Sn10Ag4Ti filler metals. Interfacial analyses by electron probe microanalysis (EPMA) showed that such TiO reaction layers of ZrO 2 /Ag27Cu3Ti and ZrO 2 /Sn10Ag4Ti possessed similar thicknesses at the same brazing condition, implying that the TiO interfacial reaction layers of both brazing systems were of the same nature and formation kinetics.

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