Principles of Brazing

Jacobson, David M.; Humpston, G.

doi:10.31399/asm.tb.pb.9781627083515

Cited by 77 publications

(36 citation statements)

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“…The large influence of the initial contact on joint quality is due to the contact of the particles required for material diffusion. This influence is further confirmed in literature on the application of MIM sinter joining, 2C-MIM (two-component MIM) and sinter brazing [19,20,[25][26][27][28].…”

Section: Influence Of the Initial Contact On The Diffusion Processsupporting

confidence: 69%

“…German [34] found that for sintered steel, an increase in density from 90% to 100% nearly doubles the tensile strength. Surface roughness leads to an increase in the distance between the joining surfaces and thus makes the joining process more difficult, so the surfaces should be as smooth as possible [21,25].…”

Section: Methodology For Evaluating Joint Qualitymentioning

confidence: 99%

“…During quality control of sinter-bonded components, the bond strength is key, besides characteristics such as shape accuracy and surface properties. Several researchers have found that the most significant influence on a successful sinter joint of compatible materials is the initial contact of the joining surfaces of the green parts before the sintering process [24,25]. Jacobson and Humpston described the sinter-joining process as the joining process least tolerant of misfit of the joining surfaces [25].…”

Section: Influence Of the Initial Contact On The Diffusion Processmentioning

confidence: 99%

“…Several researchers have found that the most significant influence on a successful sinter joint of compatible materials is the initial contact of the joining surfaces of the green parts before the sintering process [24,25]. Jacobson and Humpston described the sinter-joining process as the joining process least tolerant of misfit of the joining surfaces [25]. Furthermore, this influence has been explicitly investigated by Klimscha [21], among others, for the effects on the achievable joint quality of MIM components.…”

Section: Influence Of the Initial Contact On The Diffusion Processmentioning

confidence: 99%

See 3 more Smart Citations

Investigation and Simulation of the Surface Contact Characteristics of Sinter-Joined Binder Jetting Components

Rütjes¹,

Stahl

Müller

et al. 2022

Applied Sciences

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Binder jetting holds great potential for revolutionizing conventional production processes for high-performance components. However, current applications face significant challenges regarding the depowdering and cleaning of complex internal geometries. A novel approach to these challenges is splitting the desired component into smaller, easy-to-clean parts and using sinter bonding to achieve the desired shape. This greatly reduces manual cleaning and preparation time during the production since sintering is required in any case. The sinter joint is currently significantly weaker than the rest of the part and may pose a risk of failure. This study focuses on the effects of different parameters that influence the joint strength and the contact surface between two parts. With different experimental setups, a variety of influences is identified and quantified: depowdering air pressure, component orientation in the build box, initial contact pressure between the green parts, and macroscopic component deformation. The experimental results are supported by a modified Boussinesq contact model. Combining experiments and simulations, it was found that the relative contact between two green parts varies between 5 and 26%, depending on the parameter set used. In this study, the authors introduce the idea of two-part manufacturing in metal binder jetting and subsequent joining of the components in the sintering process.

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Section: Influence Of the Initial Contact On The Diffusion Processsupporting

confidence: 69%

Section: Methodology For Evaluating Joint Qualitymentioning

confidence: 99%

Section: Influence Of the Initial Contact On The Diffusion Processmentioning

confidence: 99%

Section: Influence Of the Initial Contact On The Diffusion Processmentioning

confidence: 99%

See 2 more Smart Citations

Investigation and Simulation of the Surface Contact Characteristics of Sinter-Joined Binder Jetting Components

Rütjes¹,

Stahl

Müller

et al. 2022

Applied Sciences

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“…Brazing is a lower-temperature alternative to other common metal-joining techniques such as welding 36 . However, joint performance and lifetime can suffer due to phase separation and resultant galvanic corrosion within the braze 37 , as shown in a comparative study on the use of Cu-Ag-Ti (CuSil) and Cu-Ag-In-Ti (InCuSil) brazes to join 316L stainless steel coupons 30 .…”

Section: Cu-ag-ti Ternary Braze Alloy: Kpfm and Sem/edsmentioning

confidence: 99%

Co-localizing Kelvin Probe Force Microscopy with Other Microscopies and Spectroscopies: Selected Applications in Corrosion Characterization of Alloys

Maryon

Efaw

DelRio

et al. 2022

JoVE

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Ultrarapid Transient‐liquid‐phase Bonding of Al₂O₃Ceramics

et al. 2008

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The vast majority of man-made structures, from skyscrapers to microelectronic devices, require joints between similar or dissimilar materials. Ideally, joining is fast, reliable, and inexpensive. Conventional joining technologies often fail to provide these characteristics for applications involving materials with fragile microstructures (e.g., nanostructures and metallic glasses) or materials intended for high-temperature applications (e.g., ultrahigh-temperature ceramics). Difficulties arise because joining temperatures are sufficiently high to degrade the microstructure, the joining time is excessive, or the use temperatures of the joined assemblies are constrained. Transient-liquid-phase (TLP) joining is an elegant means to reduce the joining temperature relative to conventional methods while retaining the potential for high-temperature use. However, TLP bonding is often time-intensive. The rapid development of strong, defect-free joints requires: (i) favorable wetting behavior to eliminate defects and (ii) rapid interdiffusion kinetics to reduce processing times. We show in this paper that Ni/Nb/Ni interlayers develop transient-liquid films that satisfy both criteria, enabling rapid, reliable, reducedtemperature TLP bonding of a model ceramic system. While the focus of this paper is on joining ultrahigh-strength Al 2 O 3 , recently we have successfully extended the method to joining Y 2 O 3 -stabilized ZrO 2 (YSZ) and ZrO 2 -toughened Al 2 O 3 (ZTA). By designing multilayer interlayers with similar wetting and interdiffusion characteristics, it should be possible to extend this novel approach to an even broader range of advanced materials combinations. Joining [1,2] methods based on welding, soldering, and brazing [3][4][5] all involve heating to form a liquid that ideally flows to fill gaps between the pieces being joined, and subsequent cooling to induce solidification of the bonding media; the joint region differs chemically and microstructurally from the materials that were joined and has a remelt temperature below the joining temperature. Typically, since joints soften well below their remelt temperature, efforts to increase the maximum use temperature employ highermelting-temperature joining media. Unfortunately, this increases the joining temperature and the likelihood of microstructural change and property degradation. Thus, it is particularly challenging to join materials, especially ceramics, which will be used at substantial fractions of their melting temperatures. TLP bonding also involves heating to form a liquid that fills the gaps between the pieces being joined, but the liquid then ''disappears'' at the bonding temperature, and the joint region remelts above the original joining temperature. [6][7][8][9][10][11][12][13] Thus, TLP bonding is capable of joining a wide range of material types at reduced temperature to mitigate property degradation, and of producing joints with higher-temperature use capability due to an increased softening temperature. However, the required time at the bonding t...

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Principles of Brazing

Cited by 77 publications

References 0 publications

Investigation and Simulation of the Surface Contact Characteristics of Sinter-Joined Binder Jetting Components

Investigation and Simulation of the Surface Contact Characteristics of Sinter-Joined Binder Jetting Components

Co-localizing Kelvin Probe Force Microscopy with Other Microscopies and Spectroscopies: Selected Applications in Corrosion Characterization of Alloys

Ultrarapid Transient‐liquid‐phase Bonding of Al₂O₃Ceramics

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Principles of Brazing

Cited by 77 publications

References 0 publications

Investigation and Simulation of the Surface Contact Characteristics of Sinter-Joined Binder Jetting Components

Investigation and Simulation of the Surface Contact Characteristics of Sinter-Joined Binder Jetting Components

Co-localizing Kelvin Probe Force Microscopy with Other Microscopies and Spectroscopies: Selected Applications in Corrosion Characterization of Alloys

Ultrarapid Transient‐liquid‐phase Bonding of Al2O3Ceramics

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Product

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Ultrarapid Transient‐liquid‐phase Bonding of Al₂O₃Ceramics