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Chemical thermodynamics as a predictive tool in the reactive metal brazing of ceramics

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Abstract

Thermodynamics have long been applied to our understanding of the reactive wetting phenomena in metal-ceramic joining. We postulate the existence of a “solvent effect” due to the interaction between the reactive element addition and the brazing alloy. This effect plays a significant role in reactive wetting. By taking this effect into account, more realistic reactivities of different reactive element additions into a given brazing base alloy are predicted. Irreversible thermodynamics are also used to characterize the driving forces for reactive metal-ceramic joining.

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Abbreviations

α:

equilibrium progressive factor

γ:

activity coefficient

Г:

surface excess

ν, ξ:

chemical stoichiometries of compound

Ξ:

=[ΔG o(ReXν - ΔH M(Re)/gn]

σ:

surface tension

μ:

chemical potential

Π:

surface area

ρ:

density

Θ:

contact angle

ω:

= (L 1w -L wgl Г i )R

a :

activity

G :

Gibbs energy

R:

gas constant

T :

temperature

H M :

partial mole enthalphy of mixing

x :

mole fraction

S, s :

entropy, entropy per unit mass

U, u :

internal energy, internal energy per unit mass

p :

pressure

V :

volume

N, n :

moles of component, moles of component per unit mass

v :

velocity

t :

time

J :

flux

K :

rate of chemical reaction

F :

body force

g :

acceleration due to gravity

A :

chemical affinity

e :

surface area per unit mass

L :

phenomenological coefficient

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Authors and Affiliations

  1. Edison Welding Institute, 43212, Columbus, OH

    G. Wang (Senior Research Engineer)

  2. The Ohio State University, 43210-1179, Columbus, OH

    J. J. Lannutti (Assistant Professor)

Authors
  1. G. Wang
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  2. J. J. Lannutti
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Wang, G., Lannutti, J.J. Chemical thermodynamics as a predictive tool in the reactive metal brazing of ceramics. Metall Mater Trans A 26, 1499–1505 (1995). https://doi.org/10.1007/BF02647601

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  • DOI: https://doi.org/10.1007/BF02647601

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