scispace - formally typeset
Search or ask a question
Author

Chen Xu

Bio: Chen Xu is an academic researcher from Hebei University of Technology. The author has contributed to research in topics: Ceramic & Magnesium alloy. The author has an hindex of 2, co-authored 4 publications receiving 69 citations.

Papers
More filters
Journal ArticleDOI
TL;DR: In this article, closed-cell aluminum foams with different kinds and contents of ceramic microspheres are obtained using melt-foaming method, and the distribution and the effects of the ceramic micro-spheres on the mechanical properties of aluminum Foams are investigated.

72 citations

Patent
10 Sep 2014
TL;DR: In this article, a method for recycling waste foamed magnesium was proposed, which consisted of firstly, carrying out pre-treatment on a waste material; secondly, smelting the waste material: evenly spreading a layer of bottom flux at the bottom of a crucible, then adding the foamed waste material treated in the first step into the crucible; and finally, refining liquid: adding a refining flux into the liquid obtained by the second step, refining, standing and drossing to remove the surface material to obtain purified magnesium alloy liquid.
Abstract: The technical scheme disclosed by the invention is to provide a method for recycling waste foamed magnesium. The method comprises the following steps of firstly, carrying out pre-treatment on a waste material; secondly, smelting the waste material: evenly spreading a layer of bottom flux at the bottom of a crucible, then adding the foamed magnesium waste material treated in the first step into the crucible, then evenly spreading a layer of bottom flux on the surface of the foamed magnesium waste material, repeating the two steps, and introducing a gas mixture of SF6 and CO2 while melting; thirdly, refining liquid: adding a refining flux into the liquid obtained by the second step, refining, standing, and drossing to remove the surface material to obtain purified magnesium alloy liquid; fourthly, casting: casting the magnesium alloy liquid into magnesium alloy ingots. By virtue of the method disclosed by the invention, foamed magnesium is recycled and regenerated, and the recovery rate can reach above 80%. Based on conventionally prepared foamed magnesium, the waste of a magnesium alloy is greatly reduced by recycling the waste foamed magnesium, the utilization rate of the material is improved and the recycling of the foamed magnesium material is achieved.

4 citations

Journal ArticleDOI
Zan Zhang1, Xingchuan Xia1, Weimin Zhao1, Xiaowei Chen1, Chen Xu1 
TL;DR: In this paper, different heat treatment temperatures and fixed heat treatment were employed to investigate the decomposition behavior of titanium hydride, and the results showed that pretreatments have a significant influence on the macrostructure and compressive properties of aluminum foams.
Abstract: Macrostructure has an important effect on the compressive properties of closed-cell aluminum foams. Meanwhile, the decomposition behavior of a foaming agent has a significant influence on the macrostructure of closed-cell aluminum foams. In order to get optimal compressive properties on aluminum foams, it is important to obtain the optimal decomposition behavior of a foaming agent. In this paper, different heat treatment temperatures and fixed heat treatment were employed to investigate the decomposition behavior of titanium hydride. For a more intuitive understanding of their decomposition characteristics of the pretreated titanium hydrides, closed-cell commercially pure Al foams were prepared by melt foaming method using different types of pretreated titanium hydrides as foaming agent. In addition, the macrostructures and quasi-static compressive properties were used to evaluate the pretreatment effect. The results showed that pretreatments have a significant influence on the macrostructure and compressive properties of aluminum foams. The decomposition characteristics of titanium hydride pretreated at 753 K for 30 min are most suitable for the preparation of closed-cell aluminum foams under present conditions, as the foams possess good combination of pore size distribution, yield strength and energy absorption capacity. DOI: http://dx.doi.org/10.5755/j01.ms.20.4.6082

4 citations

Journal ArticleDOI
TL;DR: In this article , the effects of temperature and molten salt ratio on the phase composition, pore structure, and flexural strength of Ti3SiC2 preform were investigated in detail.
Abstract: Ti3SiC2 preform reinforced SiC ceramic matrix composites (Ti3SiC2/SiC) were successfully fabricated through a novel near-net-shape process strategy combining molten salt synthesis with subsequent polymer infiltration and pyrolysis (PIP) for the first time. The effects of temperature and molten salt ratio on the phase composition, pore structure, and flexural strength of Ti3SiC2 preform were investigated in detail. The morphology and microstructure evolution of the composites during the PIP process were observed by SEM and TEM. The mechanical properties, electromagnetic interference shielding effectiveness (EMI SE) and thermal conductivity of Ti3SiC2/SiC were significantly improved compared to PDC-SiC, which benefits from the connected network skeleton of Ti3SiC2 preform. The flexural strength and fracture toughness of Ti3SiC2/SiC are 198.7 MPa and 4.5 MPa∙m1/2. The EMI SE remains above 30 dB covering the entire X-band and its average value is 46.92 dB. The thermal conductivity is 6-7 W/(m·k) (25 °C to 1000 °C).

3 citations

Patent
12 Jun 2013
TL;DR: In this paper, a heat treatment technology for enhancing foam magnesium alloy, relating to the manufacture of alloy with open/close porosity, is presented. But, it is not suitable for as-cast condition.
Abstract: The invention provides a heat treatment technology for enhancing foam magnesium alloy, relating to the manufacture of alloy with open/close porosity. The heat treatment technology for enhancing the foam magnesium alloy comprises the steps of performing insulation treatment on a base body material of the foam magnesium alloy for 8-30 hours under the temperature of 400 DEG C to 600 DEG C by using a chamber type electric resistance furnace; and under the condition of room temperature, cooling the base body material of the foam magnesium alloy obtained in the first step and subjected to the insulation treatment to the room temperature so as to manufacture the foam magnesium alloy material which has good corrosion resisting performance in a corrosive medium. The heat treatment technology improves the corrosion resisting performance of the foam magnesium alloy, simultaneously guarantees the mechanical performance of the foam magnesium alloy and overcomes the defect that the corrosion resisting performance of the foam magnesium alloy of the prior art is poor under the as-cast condition.

1 citations


Cited by
More filters
Journal ArticleDOI
TL;DR: An updated overview of the different manufacturing processes of composite and nanocomposite metal foams is provided.
Abstract: Open-cell and closed-cell metal foams have been reinforced with different kinds of micro- and nano-sized reinforcements to enhance their mechanical properties of the metallic matrix. The idea behind this is that the reinforcement will strengthen the matrix of the cell edges and cell walls and provide high strength and stiffness. This manuscript provides an updated overview of the different manufacturing processes of composite and nanocomposite metal foams.

103 citations

Journal ArticleDOI
Boyi Zhang1, Yingfei Lin1, Li Shuo1, Dongxian Zhai1, Gaohui Wu1 
TL;DR: In this paper, the compressive deformation behavior of aluminum matrix syntactic foams with varying cenosphere sizes have been studied at varying strain rates (from 10 to 3∼103 s −1 ).
Abstract: The compressive deformation behavior of aluminum matrix syntactic foams with varying cenosphere sizes have been studied at varying strain rates (from 10 to 3∼103 s −1 ). The results showed that the size of the cenospheres and the strain rates had significant effects on the compressive properties. The smaller cenospheres ensured higher compressive strength due to fewer flaws in the microstructure and better mechanical stability. The energy absorption of the present syntactic foam was found to increase with an increase in strain rates. Compared to the conditions under quasi-static loading, the energy absorption capacity of syntactic foam exhibited 75–85% more under dynamic loading. The different compressive failure characteristics of syntactic foams could be attributed to the unit of shear displacement which got smaller with the increasing strain rates. These foams showed pronounced energy absorption capabilities, suggesting their potential for use in blast and impact protection.

71 citations

Journal ArticleDOI
TL;DR: In this paper, an AlSi12 matrix hybrid MMSF with monomodal Globocer (Al 2 O 3 and SiO 2 based ceramic) and pure Fe reinforcements were produced by pressure infiltration.
Abstract: Hybrid metal matrix syntactic foams (hybrid MMSFs) are particle reinforced composites in which the reinforcement is the combination of more than one grade of hollow spheres. The difference between the spheres can be in their chemical composition, dimension, physical properties etc. In this study AlSi12 matrix hybrid MMSFs with monomodal Globocer (Al 2 O 3 and SiO 2 based ceramic) and Globomet (pure Fe) reinforcements were produced by pressure infiltration. The investigation parameters were the ratio of the hollow sphere grades and the aspect ratio of the specimens. Microstructural investigations showed almost perfect infiltration and favourable interface layer, while quasi-static compression tests showed that the composition of the reinforcement and the aspect ratio of the specimens have determinative effect on the characteristic properties (compressive and flow strength, fracture strain, stiffness and absorbed energy). This nature of the MMSFs ensures the possibility to tailor their properties in order to optimise them for a given application.

65 citations

Journal ArticleDOI
TL;DR: In this article, the effect of strain rate on their compressive behavior was investigated as these properties are vital in terms of the applications of these materials and the degree of correlation between the numerical simulations and the experimental results has been shown to be reasonably good.

64 citations

Journal ArticleDOI
TL;DR: A broad understanding of the processing and basic mechanical, microstructural, and physical properties of different types of composite metal foams is discussed in the first part of the paper as mentioned in this paper, and some recent studies on high strain rate properties, ballistic performance, radiation attenuation, and thermal properties of composites are discussed and compared with other bulk materials.
Abstract: This paper reviews the background and evolution of composite metal foam (CMF) from its inception until now. A broad understanding of the processing and basic mechanical, microstructural, and physical properties of different types of composite metal foams is discussed in the first part of the paper. In the second part, some recent studies on high strain rate properties, ballistic performance, radiation attenuation, and thermal properties of composite metal foams are discussed and compared with other bulk and control materials. These properties suggest many potential applications for this novel material in a broad range of engineering structures from ballistic armors to trains', cars', buses', helicopters' crashworthiness systems, and many others such as nuclear casks and thermal insulating units.

61 citations