Kinetics of interlayer formation on polycrystallineα-Al2O3/copper-titanium alloy interface

Chidambaram, P.R.; Edwards, G.R.; Olson, D. L.

doi:10.1007/bf02652309

Cited by 14 publications

(16 citation statements)

References 11 publications

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“…Much itself is examined by scanning transmission electron microresearch has demonstrated that Ti is an active element in scope (STEM) and electron probe microanalysis (EPMA), copper and silver-base braze alloys. [7,10,11] The addition of respectively. The phase(s) at the reaction layer will be identiTi to silver/copper alloys improves the wettability of many fied based on STEM analysis.…”

Section: Introductionmentioning

confidence: 99%

“…[6,7,9,10] of infrared energy generated by heating a tungsten filament Moreover, the active element in the braze can only be effecin a quartz tube as the heating source, providing rapid heating tive if sufficiently high temperatures are used for the joining and cooling up to 3000 ЊC/min; therefore, infrared brazing operation so that the active ingredient is able to react with is highly suitable in studying the mechanism of early stage the ceramics. [2,11] Therefore, the active ingredient plays an reactive wetting. [26,27] important role in active brazing.…”

Section: Introductionmentioning

confidence: 99%

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Microstructural evolution at the bonding interface during the early-stage infrared active brazing of alumina

Shiue

Wang

2000

Metall Mater Trans A

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Infrared brazing of Al 2 O 3 and alloy 42 using a silver-base active braze alloy was investigated at 900 ЊC for 0 to 300 seconds, with a heating rate of 3000 ЊC/min. Experimental results show that Ti 3 (Cu, Al) 3 O intermetallic with various amounts of Al is observed in the reaction layer and plays an important role in the early stage of reactive wetting. A two-layer structure is observed at the reaction interface brazed at 900 ЊC for 5 seconds. The reaction layer close to the alumina contains large amounts of Al, so the mass balance of the system is maintained. The growth of the reaction layer is not rate controlled by diffusion within the first 120 seconds. After 120 seconds, the rate controlling mechanism of the reaction layer becomes the diffusion control, satisfying the parabolic law. Dynamic wetting angle measurements using a traditional vacuum furnace at the heating rate of 10 ЊC/min demonstrate that the wetting angle rapidly decreases within the first 150 seconds, especially 0 to 80 seconds, and eventually stabilizes after 600 seconds.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Microstructural evolution at the bonding interface during the early-stage infrared active brazing of alumina

Shiue

Wang

2000

Metall Mater Trans A

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“…However different results have been reported [20][21][22]25,26]. Kritsalis et al [20] firstly reported a metallic-like oxide TiO that benefits the wetting.…”

Section: Interfacial Chemistry and Microstructurementioning

confidence: 98%

“…It was reported that the oxygen released from the dissolution of alumina is more likely to react with the titanium present at the interface than being dissolved in liquid copper, while aluminum can be expected to go into solution in copper [26]. From Table 1, it can be seen that Ti and O is more concentrated in area R for the composite sample than that for the Ti/Cu/S and Cu/Ti/S sessile drop samples, while Cu and Al in area M. This can be more clearly seen from Fig.…”

Section: Interfacial Chemistry and Microstructurementioning

confidence: 98%

Wetting and pressureless infiltration in the CuTi/Al2O3 system under poor vacuum

Sang

Weiler

Aulbach

2010

Ceramics International

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“…Sodium wets alumina and forms intermetallics, which are then wet by tin. [22,23] Some oxides possess a partially metallic character, and it has been proposed that the work of adhesion increases as the metallic nature of the ceramic phase increases. [3,7,16,17] Titanium is known to react with the surface of aluminum oxide to generate a favorable interfacial gradient with respect to both stress and composition.…”

Section: Introductionmentioning

confidence: 99%

Titanium preconditioning of Al2O3 for liquid-state processing of Al-Al2O3 composite materials

Javernick

Edwards

Chidambaram

1998

Metall Mater Trans A

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Chemical vapor deposition (CVD) of titanium onto the surface of alumina substrates was used to improve the wetting by molten aluminum prior to infiltration. The CVD titanium coatings on alumina substrates were characterized by X-ray diffraction and energy-dispersive X-ray spectroscopy (EDS) as dual-phase, elemental titanium and titanium aluminide, Ti 3 Al. The kinetics of the coating process were quantified and analyzed using established reaction kinetics models. An overall activation energy of 219 kJ/mole was calculated for the formation of the titanium coatings on planar alumina substrates, for the temperature range of 610 ЊC to 870 ЊC. The CVD-coated planar and porous alumina substrates were immersed in molten aluminum, and wetting of planar substrates and infiltration of porous bodies were documented. Formation of both aluminum-rich and titanium-rich reaction products was observed through EDS cross-sectional analysis.

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Kinetics of interlayer formation on polycrystallineα-Al2O3/copper-titanium alloy interface

Cited by 14 publications

References 11 publications

Microstructural evolution at the bonding interface during the early-stage infrared active brazing of alumina

Microstructural evolution at the bonding interface during the early-stage infrared active brazing of alumina

Wetting and pressureless infiltration in the CuTi/Al2O3 system under poor vacuum

Titanium preconditioning of Al2O3 for liquid-state processing of Al-Al2O3 composite materials

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