Microstructural and mechanical evaluation of a Cu-based active braze alloy to join silicon nitride ceramics

Singh, Mrityunjay; Asthana, R.; Varela, F.M.; Fernandez, James

doi:10.1016/j.jeurceramsoc.2010.07.022

Cited by 36 publications

(11 citation statements)

References 24 publications

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“…This featureless product phase presumably formed from the coalescence of coarsened silicide crystals. It is conceivable that the growth of product phase was initially controlled by the rate of chemical reaction and later, when an appreciable thickness was developed, the growth kinetics were limited by the slower process of diffusion of reacting species across an already formed reaction layer [29]. Joint formation is promoted by the reactions which yield low contact angles of braze on Si 3 N 4 substrates.…”

Section: Resultsmentioning

confidence: 99%

Characterization of the Si3N4/Si3N4 joints fabricated using particles modified braze

He¹,

Zhang²,

Li³

2014

Materials Science and Engineering: A

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Section: Resultsmentioning

confidence: 99%

Characterization of the Si3N4/Si3N4 joints fabricated using particles modified braze

He¹,

Zhang²,

Li³

2014

Materials Science and Engineering: A

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“…Hence, in the analysis of dissimilar material joints, in a similar fashion to fracture mechanics, the major reason that the theoretical infinite stresses predicted by the elastic theory do not exist at the interface of dissimilar material joints is due to plasticity effects in real materials, even those that are known to fail in a brittle manner. The presence of dislocations due to plasticity at the interface of Si 3 N 4 ceramic to Si 3 N 4 ceramic joints brazed with copper based filler has been proven experimentally using a TEM by Singh et al [24] and a significant amount of theoretical work has been done to predict the size of the plastic zone theoretically [25]. In addition to plasticity effects blunting the theoretical singularity, inelastic behaviour due to creep will also have a similar effect.…”

Section: Do Elastic Singularities Exist In Real Dissimilar Materials Jmentioning

confidence: 96%

The metallurgy, mechanics, modelling and assessment of dissimilar material brazed joints

Hamilton

Wood

Galloway

et al. 2013

Journal of Nuclear Materials

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At the heart of any procedure for modelling and assessing the design or failure of dissimilar material brazed joints there must be a basic understanding of the metallurgy and mechanics of the joint. This paper is about developing this understanding and addressing the issues faced with modelling and predicting failure in real dissimilar material brazed joints and the challenges still to be overcome in many cases. An understanding of the key metallurgical features of such joints in relation to finite element modelling is presented in addition to a study of the mechanics and stress state at an abrupt interface between two materials. A discussion is also presented on why elastic singularities do not exist based on a consideration of the assumption of an abrupt change in material properties and plasticity in the vicinity of the joint. In terms of modelling real dissimilar material brazed joints; there are several barriers to accurately capturing the stress state in the region of the joint and across the brazed layer and these are discussed in relation to a metallurgical study of a real dissimilar material brazed joint. However, this does not preclude using a simplified modelling approach with a representative braze layer in design and failure assessment away from the interface. In addition modelling strategies and techniques for assessing the various failure mechanisms of dissimilar material brazed joints are discussed. The findings from this paper are applicable to dissimilar material brazed joints found in a range of applications; however the references listed are primarily focused on work in fusion research and development

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“…The common methods for joining ceramics with metals mainly include solid phase bonding, brazing and direct bonding [3][4][5]. However, they have several drawbacks, such as expensive filler, long brazing time and high vacuum environment [6,7].…”

Section: Introductionmentioning

confidence: 99%

Effect of ultrasonic transmission rate on microstructure and properties of the ultrasonic-assisted brazing of Cu to alumina

Chen

2017

Ultrasonics Sonochemistry

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Fluxless brazing of bare alumina with Cu was conducted with an ultrasonic-assisted brazing technique by a Zn-14wt.%Al filler. The shear strength of Cu/alumina joints (84MPa) exhibited 27% larger than the alumina/Cu joints (66MPa) due to different intermetallic phases and their morphologies formed in the seam under the same parameters, which are probably attributed to the transmission rate of ultrasonic energy varying with density of the ultrasonic horn-contacted materials. Overgrowth of stalactite-like CuZn contributes to better thermal dissipation of the ultrasonic-assisted brazed Cu/alumina joints.

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Microstructural and mechanical evaluation of a Cu-based active braze alloy to join silicon nitride ceramics

Cited by 36 publications

References 24 publications

Characterization of the Si3N4/Si3N4 joints fabricated using particles modified braze

Characterization of the Si3N4/Si3N4 joints fabricated using particles modified braze

The metallurgy, mechanics, modelling and assessment of dissimilar material brazed joints

Effect of ultrasonic transmission rate on microstructure and properties of the ultrasonic-assisted brazing of Cu to alumina

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