Thermal contact conductance between solid interfaces under low temperature and vacuum

Xiao, Yang; Sun, Harold; Xu, Lei; Feng, Haidong; Zhu, Hongmei

doi:10.1063/1.1786356

Cited by 18 publications

(5 citation statements)

References 1 publication

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“…since the contact area S C is at least smaller than the cross-sectional area S 0 = 3.3•10 -10 m 2 , see table 6. the ITC can vary in a wide range of 10 3 -10 8 W m −2 K −1 depending on the adhesion between the sample and the substrate [20,22,[31][32][33]. The ITC measured in this article is consistent with the literature data.…”

Section: Interfacial Thermal Conductance At Laser Heatingsupporting

confidence: 89%

Interfacial thermal conductance of 7075 aluminum alloy microdroplets in contact with a solid at fast melting and crystallization

Минаков

Morikawa

Ryu

et al. 2022

Mater. Res. Express

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Ultrafast nanocalorimetry, in combination with high-speed IR thermography, is used to measure the interfacial thermal conductance (ITC) of the thermal contact of metal microdroplets with a solid during fast melting (including laser heating). IR thermography and membrane nanocalorimetry were used to measure the temperature difference at the membrane/sample interface during the melting and crystallization of aluminium alloy (AA7075) microdroplets (20 μm in diameter) over a wide range of heating and cooling rates (up to 105 K/s). This is the first time ITC has been measured at such high heating and cooling rates with this new method. We found that the interfacial temperature difference reaches about 80 K during the solidification of microdroplets during laser heating. This result is significant for understanding various industrial laser-assisted processes. It has been established that ITC measured for AA7075 microdroplets gradually increases by an order of magnitude during melting in the range from the solidus temperature to the liquidus temperature of the alloy. This unusual behavior of ITC during melting can be important for understanding and optimizing laser-assisted additive manufacturing processes.

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Section: Interfacial Thermal Conductance At Laser Heatingsupporting

confidence: 89%

Interfacial thermal conductance of 7075 aluminum alloy microdroplets in contact with a solid at fast melting and crystallization

Минаков

Morikawa

Ryu

et al. 2022

Mater. Res. Express

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“…The distribution of the heat between the interacting surfaces was assumed to be identical, whereas the fraction of dissipated energy converted into heat (mechanical to thermal) was assumed to be 90% of the overall frictional energy, in order to account for heat transfer losses due to lubrication. The contact thermal conductance for steel under vacuum was assumed to be pressure dependent; its value ranged between 0.8 and 2.0 m·W/mm 2 . The thermo‐mechanical and thermo‐physical properties of 100Cr6 were linearly interpolated with temperature between the values listed in Table .…”

Section: Methodsmentioning

confidence: 99%

Tribochemical degradation of vacuum‐stable lubricants: A comparative study between multialkylated cyclopentane and perfluoropolyether in a vacuum ball‐on‐disc and full‐bearing tests

Kürten

Khader

Kailer

2020

Lubrication Science

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In this study, the decomposition of a multialkylated cyclopentane (MAC) and a perfluoro-poly-ether (PFPE) lubricant was investigated in a ball-on-disc sliding test under vacuum and in a rolling contact fatigue (RCF) test on full bearings. In situ mass spectrometry was conducted to study the tribochemical formation of hydrogen in a steel-on-steel ball-on-disc sliding contact. Further investigations on lubricant degradation in rolling-sliding contact indicated fragmentation and oxidation reaction of the MAC oil by interaction with the oxide layer and the nascent bearing steel. Finite element method (FEM) analysis was carried out to model the contact in the ball-on-disc experiments and to extract contact surface temperature fields. Post-RCF hydrogen analysis of bearing components indicated increased hydrogen content in the samples lubricated with the MAC fluid. The RCF tests with PFPE did not indicate any signs of surface damage. K E Y W O R D Sball-on-disc sliding test, cylindrical roller thrust bearings, hydrogen, lubricant degradation, lubrication, rolling contact fatigue, vacuum tribology

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“…The formation of plate-like ice crystal morphology requires the presence of a constitutional supercooled region before the planar ice front [20]. Such ice formation also requires low speed movement of the solid/liquid interface [23]. According to the research of Chalmer and Rutter [24], constitutional supercooling is induced by concentration distribution.…”

Section: A Sponge Morphologymentioning

confidence: 99%

Preparation Chitosan Lactate-Hyaluronate Sponges with Unidirectional Porous Structure and Their Potential Use as Wound Dressings

Lai¹

2014

IJBBB

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Abstract-Sponges were prepared from lactic acid-grafted chitosan (LCH) and hyaluronate (HA) to develop potential materials for wound dressing. Sponges with different microstructures can be obtained in a vertical temperature-controlled device and in an aluminum vessel. The morphology and permeability properties, including porosity, water permeability, gas permeability, water adsorption and in vitro biodegradation of two types of sponges were compared in detail. Sponges with microtubule-oriented structure can be obtained in a vertical temperature-controlled device with TBA (tertiary butyl alcohol). These sponges exhibited an applicable water permeation rate of 577 g•m -2 •day -1 and higher air permeability tensor of 3 × 10 -12 . The sponges with random micropores can be prepared in an aluminum vessel. These sponges exhibited a water permeation rate and an air permeability tensor of 452 g•m -2 •day -1 and 1.8 × 10 -14 g•m -2 •day -1 , respectively. These results also indicated that TBA greatly affected the microstructure of the resulting sponges. A parallel orientation of the pore structure resulted in higher porosity and higher water adsorption capacity than random pores. After lactic acid was grafted, the crystallinity of chitosan decreased and water solubility increased, causing rapid lysozymatic degradation of chitosan lactate-HA sponges. The resulting sponges exhibited high water content, gas permeability and appropriate water permeation; such sponges could easily be applied and removed. These properties indicated that these materials are highly applicable as wound dressing.Index Terms-Chitosan lactate, hyaluronate, sponge.

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Thermal contact conductance between solid interfaces under low temperature and vacuum

Cited by 18 publications

References 1 publication

Interfacial thermal conductance of 7075 aluminum alloy microdroplets in contact with a solid at fast melting and crystallization

Interfacial thermal conductance of 7075 aluminum alloy microdroplets in contact with a solid at fast melting and crystallization

Tribochemical degradation of vacuum‐stable lubricants: A comparative study between multialkylated cyclopentane and perfluoropolyether in a vacuum ball‐on‐disc and full‐bearing tests

Preparation Chitosan Lactate-Hyaluronate Sponges with Unidirectional Porous Structure and Their Potential Use as Wound Dressings

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