Wettability in Joining of Advanced Ceramics and Composites: Issues and Challenges

Asthana, R.; Sobczak, N.

doi:10.1002/9781118932995.ch67

Cited by 5 publications

(4 citation statements)

References 64 publications

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“…Applying a hardened layer certain thickness on the detail's surfaces or directly applying it to the required depth in the working part can be a method of increasing the value a number mechanical characteristic of materials [4,5]. In this case, the phenomenon wettability of dispersed particles by a metallic melt is an inherent factor [6][7][8]. WC and TiС powders were selected hardening particles in this work; they were fixed in the necessary part of the casting.…”

Section: Introductionmentioning

confidence: 99%

Method of Creation and Research Experimental Dispersed-Reinforced Materials

Аникеев

Chumanov

Seduhin

2018

MSF

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Mining and processing minerals is one of the priority directions of development the state. Machines parts experience tremendous loads during extraction and processing of soils, this leads to their rapid wear. Several principal ways to increase the wear resistance these materials exist: the creation of coatings (surfacing, laser, plasma treatments), melt doping, the introduction local wear-resistant elements. The introduction wear-resistant inserts into the base metal in places that are subject to the greatest load is the most preferable from the point of view of economic efficiency. The method obtaining local wear-resistant elements based on carbides, their introduction into the gasified casting, as well as the study the structure and properties the materials obtained are described in this article.

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Section: Introductionmentioning

confidence: 99%

Method of Creation and Research Experimental Dispersed-Reinforced Materials

Аникеев

Chumanov

Seduhin

2018

MSF

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“…The sessile drop (SD) method (Ref [18][19][20][21][22] was applied for investigation of high-temperature wetting behavior of molten AlTi6 alloy on MWCNT paper using experimental complex described in detail in Ref 29. In order to avoid the effects of native oxide film on metal sample as well as heating history of alloy/substrate couple on wetting behavior, the research was performed under UHV using non-contact heating of a metal and a substrate coupled with capillary purification (cp) as described in Ref 18,21,22,29. For this purpose, directly before loading into a vacuum chamber, the sample of AlTi6 alloy was cleaned mechanically and ultrasonically in isopropanol and placed inside a ceramic capillary positioned above the MWCNT substrate.…”

Section: Methodsmentioning

confidence: 99%

“…Another widely used casting technique is based on infiltration of porous preform with molten metal matrix. For this purpose, either external pressure or improvement in wetting is needed because of the lack of wettability in Al/C system at industrially important temperatures below 800°C (Ref [18][19][20][21][22][23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Wetting Behavior and Reactivity Between AlTi6 Alloy and Carbon Nanotubes

Homa

Sobczak

et al. 2016

J. of Materi Eng and Perform

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Wetting behavior between molten AlTi6 alloy and nanoporous carbon substrate (carbon nanotubes paper) was investigated by a sessile drop method in vacuum at 800, 900, and 1000°C. In order to avoid the effect of native oxide film on metal sample, an advanced capillary purification technique coupled with non-contact heating was applied. The AlTi6 drop did not wet the MWCNT paper immediately after deposition on the substrate at 800°C, forming a contact angle of h = 153°. The increase in temperature up to 900°C and holding the system for 15 min also did not affect the contact angle (h = 153 ± 1). Further heating above 930°C at a rate of 5°C/min caused a gradual lowering of contact angle down to $130°and after about 10-min interaction at 1000°C, it reached the final value of 123°. Structural investigations of solidified sessile drop AlTi6/MWCNT couple by scanning and transmission electron microscopy showed that high-temperature interaction between MWCNTs and molten AlTi6 alloy is accompanied with liquid metal infiltration of MWCNT substrate, fragmentation of MWCNTs, and formation of TiC in the form of rod-like crystallites and fine particles uniformly distributed in the metal matrix. The mechanism of MWCNT fi TiC transformation in the AlTi6/MWCNT system by high-temperature liquid-assisted process is discussed.

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“…At higher temperature and longer contact time, wetting in the Al/C system is accompanied with the formation of undesirable carbide Al 4 C 3 , responsible for low corrosion resistance and brittleness of composite material. Improvement in low temperature wettability of the Al/C system can be achieved either by alloying Al with reactive additions such as Ti (Ref 7,10,11) and Si ( Ref 9,11) or by covering carbon surfaces with technological coating either metallic [e.g., Cu, Ni (Ref 11,12)] or metal-like ceramics [e.g., TiB 2 (Ref 13)]. Addition of Ti improves physico-chemical compatibility in the Al/C system because of the formation of TiC instead of Al 4 C 3 (Ref 7,10,(14)(15)(16).…”

Section: Introductionmentioning

confidence: 99%

High-Temperature Interaction Between Molten AlSr10 Alloy and Glass-Like Carbon Substrate

Siewiorek

Sobczak

et al. 2016

J. of Materi Eng and Perform

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Wettability of glass-like carbon substrate (C glc ) by molten Al-10 wt.% Sr alloy (AlSr10) has been examined by a sessile drop method at 700-800°C for 120 min under vacuum. Non-contact heating to the test temperature combined with the removal of oxide film from the alloy drop was done using capillary purification procedure by squeezing the liquid alloy from a capillary. The influence of the type of capillary on wetting behavior of AlSr10/C glc couples was noticed. Molten AlSr10 alloy does not wet C glc at about 700°C forming the contact angles of 111°with graphite capillary and 141°with alumina capillary. At 800°C with alumina capillary, non-wetting-to-wetting transition takes place resulting in a final contact angle of 70°. After testing at 800°C, the AlSr10/C glc interface was revealed at the test temperature directly in the vacuum chamber by the drop suction procedure. Structural characterization of the interfaces by scanning and transmission electron microscopy combined with energy-dispersive x-ray spectroscopy and by scanning probe microscopy combined with Auger electron spectrometry did not show any new phases formed with Sr. It suggests that the dominant role in wettability improvement by alloying Al with 10 wt.% Sr was related with significant lowering of the surface tension of liquid metal and adsorption of Sr at the interface.

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Wettability in Joining of Advanced Ceramics and Composites: Issues and Challenges

Cited by 5 publications

References 64 publications

Method of Creation and Research Experimental Dispersed-Reinforced Materials

Method of Creation and Research Experimental Dispersed-Reinforced Materials

Wetting Behavior and Reactivity Between AlTi6 Alloy and Carbon Nanotubes

High-Temperature Interaction Between Molten AlSr10 Alloy and Glass-Like Carbon Substrate

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