High-temperature metallizing

Twentyman, M. E.

doi:10.1007/bf01163071

Cited by 58 publications

(6 citation statements)

References 4 publications

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“…Extensive work has been reported on joining of Al 2 O 3 to stainless steel via the Mo-Mn route, [7,8,9] and the technological development resulted in publication of several patents. [10][11][12][13] Much of this published literature is related to joining of debased Al 2 O 3 to stainless steel, [7] and very limited work has been reported on joining HIP-Al 2 O 3 to stainless steel. [6] Moreover, the microstructural evolution at various stages of brazing is not well studied.…”

Section: Introductionmentioning

confidence: 99%

Brazing of hot isostatically pressed-Al2O3 to stainless steel (AlSl 304L) by Mo-Mn route using 72Ag-28Cu braze

Mishra

Athavale

Pappachan

et al. 2005

Metall Mater Trans A

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Joining of stainless steel (AISI 304L) to hot isostatically pressed alumina (HIP-Al 2 O 3 ) using the brazing alloy 72Ag-28Cu was investigated. The microstructural characterization at various stages of joining, including metallization, annealing of overlaid Ni coating, and brazing, was comprehensively evaluated. The interface structure and the growth of phases were analyzed with optical microscope, scanning electron microscope, and electron probe microanalyzer (EPMA). Additionally, the leak tightness of these joints was assessed using a He-leak detector. Experimental results indicated the development of the manganese aluminate spinel (MnAl 2 O 4 ) layer at the metallizing stage, which penetrated into HIP-Al 2 O 3 . The Ni overlaid coating further resulted in the formation of the Ni(Mo) solid solution layer followed by the Mo-rich phase. During the solid-state reaction and subsequent brazing cycle, the growth of the spinel layer close to HIP-Al 2 O 3 was not adversely affected. The microstructure of the brazed joint was complex. It showed a eutectic structure within the brazed zone and a thin layer of Mo-rich, Ni-rich phases close to HIP-Al 2 O 3 . Increasing the brazing time resulted in the excessive growth of the thin layer that seriously affected the leak tightness of the joint.

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Section: Introductionmentioning

confidence: 99%

Brazing of hot isostatically pressed-Al2O3 to stainless steel (AlSl 304L) by Mo-Mn route using 72Ag-28Cu braze

Mishra

Athavale

Pappachan

et al. 2005

Metall Mater Trans A

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“…Metallization, such as the so-called moly-manganese process, [3][4][5][6] represents one of the most common methods for joining oxide ceramics and is known to be highly reliable. However, this method requires metallization of ceramic surfaces prior to the final joining process.…”

Section: Introductionmentioning

confidence: 99%

Fracture behavior and reliability of brazed alumina joints via Mo–Mn process and active metal brazing

Yang,

Kang

2000

J. Mater. Res.

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Alumina/alumina and alumina/kovar/alumina joints were produced via two joining techniques: (i) a moly-manganese process and (ii) active metal brazing. These joints were heat treated at 400°C for 100 h to evaluate their fracture strength, fracture behavior, and high-temperature reliability. Depending on the joining methods employed, the optimum microstructure of ceramics for joining is different. It was found in most cases, that the active metal brazing resulted in superior joint strength and reliability over the moly-manganese process. The fracture strength and reliability of alumina/kovar/alumina joints were lower than those of alumina/alumina joints and showed different fracture behaviors. After heat treatment, fracture strength and reliability decreased due to the formation of brittle phases at the joint interface. The fraction of brittle debonding at the interface increased with heat treatment, while that of fracture within the alumina decreased.

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“…The glassy phase from the A'203 migrates into the metal powder under the influence of capillary forces and bonds the metal particles to each other and to the A1203 surface, producing a wettable surface layer. In the case of pure A1103 and oxides without binder phases, it is necessary to add glasses to the metallizing mixtures [25]. The Mo coating is generally electroplated with Ni to provide a clean and continuous surface as well as one on which an applied braze would easily spread.…”

Section: Introductionmentioning

confidence: 99%

The influence of contact angle, wettability, and reactivity on the development of indirect-bonded metallizations for aluminum nitride

Norton

1992

Journal of Adhesion Science and Technology

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The use of aluminum nitride (AIN) as a substrate and packaging material for microcircuit applications is of present interest due to its many advantageous physical properties. A limitation to the widespread use of AIN is the lack of an adequate metallization system. In this paper, the indirectbonded metallization of AIN will be reviewed-in particular, thick-film metallization, where the intermediate material is often a glass, and brazing, where the intermediate material is an active metal. Requirements which must be considered in producing successful metallizations include wetting of the substrate and the metal by the intermediate phase, and the reactivity between the intermediate phase and the substrate. In the case of thick-film metallization, these reactions can often be deleterious to the properties of the metal layer. In brazing, reaction between the active metal and the substrate is essential for achieving wetting of the ceramic surface by the molten braze and, thus, for producing high-strength joints. The reactions which occur in many of the systems considered can be predicted by examination of thermodynamic data.

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High-temperature metallizing

Cited by 58 publications

References 4 publications

Brazing of hot isostatically pressed-Al2O3 to stainless steel (AlSl 304L) by Mo-Mn route using 72Ag-28Cu braze

Brazing of hot isostatically pressed-Al2O3 to stainless steel (AlSl 304L) by Mo-Mn route using 72Ag-28Cu braze

Fracture behavior and reliability of brazed alumina joints via Mo–Mn process and active metal brazing

The influence of contact angle, wettability, and reactivity on the development of indirect-bonded metallizations for aluminum nitride

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