National Key Laboratory of Material Behaviors and Evaluation Technology in Space Environments

Harbin, China

National Key Laboratory of Material Behaviors and Evaluation Technology in Space Environments

Harbin, China

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Luo Z.,Harbin Institute of Technology | Zhang Q.,Harbin Institute of Technology | Zhang Q.,National Key Laboratory of Material Behaviors and Evaluation Technology in Space Environments | Wu G.,Harbin Institute of Technology | Wu G.,National Key Laboratory of Material Behaviors and Evaluation Technology in Space Environments
International Journal of Heat and Mass Transfer | Year: 2015

In this paper, novel nano-enhanced phase change materials (NePCMs) were prepared by two step method. Nano-titania and erythritol were chosen as nano material and phase change material (PCM), respectively. Among many dispersants, triethanolamine (TEA) was proved the most effective one due to its low molecular weight and the carried hydroxide radical. The results showed that the heat capacity of NePCMs was enhanced by the doping of nano-titania. The enhancement was about 40% and 14% in solid and liquid state, respectively, when the volume fraction of nano-titania was only 0.2 vol%. We argued that the increased fraction of atoms located in the metastable interfaces contributed to the increase of specific heat capacity in solid state. While in liquid state, the enhancement of heat capacity was due to the increased interfacial thermal resistance caused by high surface area of nanoparticles. © 2014 Elsevier Ltd. All rights reserved.


Luo Z.,Harbin Institute of Technology | Zhang Q.,Harbin Institute of Technology | Zhang Q.,National Key Laboratory of Material Behaviors and Evaluation Technology in Space Environments | Ma X.,Harbin Institute of Technology | Wu G.,National Key Laboratory of Material Behaviors and Evaluation Technology in Space Environments
Micron | Year: 2014

In this paper, sandwich composite (SWC) with Fe-Al soft magnetic alloy sandwiched between pure iron substrates was proposed and fabricated by hot pressing and diffusion treatment. The microstructure evolution process of the composite was investigated. Fe/Fe2Al5/Fe diffusion couple was obtained at 700°C and subsequently kept at 900°C for further isothermal diffusion. During the diffusion reactive process, we confirmed that major FeAl2 and minor Fe4Al13 were produced when Fe2Al5 dissolved. After 10h of diffusion treatment, FeAl and α-Fe(Al) were the only two intermetallic phases left. Except FeAl2, the thickness of each intermetallic layer held good parabolic relationship with the diffusion annealing time. © 2014 Elsevier Ltd.


PubMed | National Key Laboratory of Material Behaviors and Evaluation Technology in Space Environments and Harbin Institute of Technology
Type: | Journal: Micron (Oxford, England : 1993) | Year: 2014

In this paper, sandwich composite (SWC) with Fe-Al soft magnetic alloy sandwiched between pure iron substrates was proposed and fabricated by hot pressing and diffusion treatment. The microstructure evolution process of the composite was investigated. Fe/Fe2Al5/Fe diffusion couple was obtained at 700 C and subsequently kept at 900 C for further isothermal diffusion. During the diffusion reactive process, we confirmed that major FeAl2 and minor Fe4Al13 were produced when Fe2Al5 dissolved. After 10h of diffusion treatment, FeAl and -Fe(Al) were the only two intermetallic phases left. Except FeAl2, the thickness of each intermetallic layer held good parabolic relationship with the diffusion annealing time.

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