Effect of Sintering Cycle on Physical and Mechanical Properties of Open Pore Cell Copper Foam

Mahaidin, Ahmad Aswad; Abdullah, Noorsyakirah; Mohammad, M. R.; Omar, Mohammed; Suleiman, Muhammad Jabir; Zainon, Nurazilah Mohd; Hadi, Mohd Afiq Nurul; Jalil, Mohd Nizam Abd; Omar, Ahmad Zahid; Hijazi, Mohd Bakri Mohd

doi:10.1016/j.proche.2016.03.051

Cited by 5 publications

(3 citation statements)

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“…The hydrogen was charged at a flow rate of 5 cc/min after being heated to 450 • C at a rate of 3 • C/min in a vacuum atmosphere (760 Torr). The temperature was increased to 850 • C in the hydrogen-reducing atmosphere, maintained there for four hours, and then increased to 950 • C, which was maintained there for an hour and a half [10]. The cylindrical, 10 mm × 36 mm-sized porous foams were sintered.…”

Section: Methodsmentioning

confidence: 99%

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The Study of Copper Powder Sintering for Porous Wick Structures with High Capillary Force

Jang

Ahn

2023

Materials

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The porosity, permeability, and capillary force of porous sintered copper were examined in relation to the effects of copper powder size, pore-forming agent, and sintering conditions. Cu powder with particle sizes of 100 and 200 μm was mixed with pore-forming agents ranging from 15 to 45 weight percent, and the mixture was sintered in a vacuum tube furnace. Copper powder necks were formed at sintering temperatures higher than 900 °C. The porosity, as determined by the Archimedes measurement method, and the permeability performance of the sintered body displayed higher values when the Cu powder size was uniform or small. To investigate the capillary force of the sintered foam, a test was conducted using a raised meniscus test device. As more forming agent was added, the capillary force increased. It was also higher when the Cu powder size was larger and the size of the powders was not uniform. The result was discussed in relation to porosity and pore size distribution.

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Section: Methodsmentioning

confidence: 99%

“…The data receiver then adjusts the value (collects 200 data points per second and calculates the average value) and displays the corrected value. The test temperature was about 26 ± 0.1 • C. maintained there for an hour and a half [10]. The cylindrical, 10 mm foams were sintered.…”

Section: Methodsmentioning

confidence: 99%

The Study of Copper Powder Sintering for Porous Wick Structures with High Capillary Force

Jang

Ahn

2023

Materials

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“…6 Among these wick structures, copper powders that are sintered onto the inner surface of a tubular copper envelope are predominant (Figure 1). This is largely due to the following advantages: (i) high thermal conductivity and low thermal resistance that allow for good heat transfer between both hot and cold ends, 7 (ii) high capillary pressure that can overcome the viscous and gravitational forces that opposes the condensate flow in the wick, 8 (iii) good mechanical strength and durability due to the formation of strong metallic bonds between powder particles, 9 and (iv) easy customization of the wick topology by heating and compressing copper metal powders with various powder grain sizes, sintering temperature, and pressure. 10,11 The wick structure (i.e., shape and thickness) can, therefore, be controlled, using different forms and sizes, to fit the spatial requirements of various heat pipe applications.…”

Section: ■ Introductionmentioning

confidence: 99%

An Ultralight Capillary-Driven Heat Pipe

Lee,

Wang,

Jeong

et al. 2024

Langmuir

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Capillary-driven heat pipes are an effective thermal solution for compacting electronic cooling systems. We advance such a heat pipe thermal solution with ultralightweighting for mobile applications. In our advancement, the envelope that encapsulates the phase-change process of a working fluid is fabricated via electroless plating being ∼40 μm thick. Furthermore, the wick structure that transports condensate to a heat source via capillarity is also electroless-plated onto the envelope's inner surfaces, creating a 100-μm-thick, microporous layer. This wick structure is sequentially superhydrophilized by blackening that forms a nanotexture on the microporous wick layer. An effective density of our prototype ultralight heat pipes (uHPs), as a measure of lightweighting, indicates, on average, a remarkable 73% weight reduction of commercial counterparts with sintered copper powder wick in similar exterior dimensions (e.g., ∼2.7 g, compared to ∼10.0 g) while providing equivalent heat spreading. Furthermore, the uHP operates at a 25% lower evaporator temperature, due to additional heat rejection to the surroundings through the ultrathin-walled envelope and wick.

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