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

Javernick, D. A.; Edwards, G.R.; Chidambaram, P.R.

doi:10.1007/s11661-998-0184-0

Cited by 8 publications

(3 citation statements)

References 32 publications

(62 reference statements)

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“…[44][45][46][47][48][49][50][51][52][53] Chemical vapor deposition titanium coatings have been shown to enhance the wettability of alumina through the formation of intermetallic species at the ceramic surface. 54 Commercially available alloys include TiCuSil™ and InCuSil™. 16,17 The Moly-Manganese process is a commercial process which uses a reduction reaction to obtain a highly reliable braze.…”

Section: Improving Interfacial Propertiesmentioning

confidence: 99%

Ceramic-metal interfaces and the spreading of reactive liquids

Meier

Javernick²,

Edwards³

1999

JOM

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Section: Improving Interfacial Propertiesmentioning

confidence: 99%

Ceramic-metal interfaces and the spreading of reactive liquids

Meier

Javernick²,

Edwards³

1999

JOM

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“…The main problem encountered in this technique of joining is how to achieve optimal wetting of the ceramic substrate by the liquid metal. In order to enhance the wettability, different solutions are used, e.g., applying active elements to the metal and ceramic pre-metallization [1][2][3]. Some active elements such as titanium have been studied both as active metal additions and as a coating on ceramic to improve the wettability of ceramic by liquid metal.…”

Section: Introductionmentioning

confidence: 99%

Characterization of Al2O3/Al/Al2O3 Joints with Ti+Cr Interlayer

Marzanna¹,

Maria

Lukasz³

et al. 2014

IJMSA

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Joints of Al 2 O 3 /Al/Al 2 O 3 are formed by liquid-state bonding of alumina substrates covered with thin Ti+Cr film of 380 nm thickness using an Al interlayer of 30 µm at 973 K under a vacuum of 0.2 mPa applied for 5 minutes and at a pressure of 0.01 MPa. The bond strength of the joints is examined by a four-point bend testing at room temperature, coupled with optical, scanning and transmission electron microscopy. Results show that introduction of the thin Ti+Cr film layer: (i) improves plasticity in the metal layer of Al 2 O 3 /Al/Al 2 O 3 joints, (ii) has positive effect on structure transformation in the interface and leads to fabrication of reliable metal-ceramic joints. Information obtained from the wetting characteristics of liquid Al on alumina substrate coated by thin Ti+Cr film indicates that the contact angle can be reduced to even less than 60°. Microstructural investigations of the interface of Al 2 O 3 /Ti+Cr/Al/Ti+Cr/Al 2 O 3 joints carried out by SEM and TEM techniques indicated that the precipitates of intermetallic phases rich in both Ti and Cr as well as Al 2 O 3 were formed at the Al/Al 2 O 3 interface, which influenced strengthening of these joints. Hence a conclusion can be drawn that the interface structure influences the mechanical durability increase in Al/Al 2 O 3 joints.

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“…Coatings of Ni, Ag, Cu, and Cr have been applied to ceramic surfaces to enhance wettability, while the Na process is used to prepare Al 2 O 3 for wetting by metallic liquids [3][4][5]. Chemical vapor depositions of titanium coatings onto Al 2 O 3 enhance its wettability [6]. The Moly-Manganese process uses a reduction reaction to obtain a reliable braze [7,8].…”

Section: Introductionmentioning

confidence: 99%

Challenges in Joining Advanced Ceramic Materials: Interface Formation of Ceramic/Metal High-Temperature Brazes

Indacochea

Polar

McDeavitt³

2005

MSF

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This paper describes the metallurgical interfacial reactions at elevated temperatures between reactive zirconium metal and stable oxide ceramics, specifically beryllia, yttria, and magnesia- zirconia composite ceramic. The ceramic/metal systems were preheated at 600°C, and then heated to peak temperatures of 1800°C or above, depending of the system, in ultra pure Argon atmosphere. After a short stay at the peak temperature, each system was cooled to room. The interaction was monitored during heating by a video camera and the interfaces were microscopically examined after the thermal cycle. The microstructure and chemical changes at the interface were evaluated via SEM and EDS. During heating of the beryllia/Zr system, the ceramic was initially reduced and Be alloyed the Zr metal in solid solution, causing Zr to melt locally at the interface at about 1600°C instead of 1855°C. The alloy Zr-Be liquid is what later dissolved the beryllia and infiltrated partially into the ceramic substrate. It seems that there was no solid state reaction between the Zr metal and yttria since Zr melted at its melting temperature of 1855°C; it is evident, however, that the liquid Zr partially dissolved yttria at the interface; yttrium and oxygen segregated to the grain boundaries. The solidified metal tightly bonded to the ceramic substrate as the system cooled to room temperature. In the Zr-MgO/ZrO2 system, Zr melted at 1855°C and it reduced the magnesia, but at the same time the magnesium was volatilized.

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

Cited by 8 publications

References 32 publications

Ceramic-metal interfaces and the spreading of reactive liquids

Ceramic-metal interfaces and the spreading of reactive liquids

Characterization of Al2O3/Al/Al2O3 Joints with Ti+Cr Interlayer

Challenges in Joining Advanced Ceramic Materials: Interface Formation of Ceramic/Metal High-Temperature Brazes

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