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Preparation and properties of gradient Al_2O_3-ZrO_2 ceramic foam by centrifugal slip casting method

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China Foundry 2012年第4期9卷 337-343页

作者： i Qiang Yu Jingyuan Tang Ji Qi Guochao Li Xiaodong College of Materials Science and Engineering Liaoning University of TechnologyJinzhou 121001China Shenyang Research Institute of Foundry Shenyang 110022China Key Laboratory for Anisotropy and Texture of Materials Ministry of EducationNortheastern UniversityShenyang 110004China

The aim of the present research is to provide a novel technique for preparing gradient Al 2 O 3-ZrO 2 ceramic *** technique used epispastic polystyrene spheres to array templates and centrifugal slip casting to obtain cell struts with gradient distribution of Al 2 O 3 and ZrO 2 particles and high packing *** Al 2 O 3-20vol.% ZrO 2 slurries with 20vol.% solid contents were prepared and the dispersion and rheological characteristics of the slurries were *** settling velocity and mass segregation of Al 2 O 3 and ZrO 2 particles at different centrifugal accelerations were calculated and *** drying behavior,macrostructure,microstructure,compressive property and resistance to thermal shock of the sintered products were also *** results show that the difference of settling velocity of Al 2 O 3 and ZrO 2 particles increases and mass segregation becomes acute with an increase in centrifugal *** cell struts prepared at a centrifugal acceleration of 1,690 g have high sintered density(99.0% TD) and continuous gradient distribution of Al 2 O 3 and ZrO 2 *** sintered at 1,550 o C for 2 h,the cell size of gradient Al 2 O 3-ZrO 2 foam is approximately uniform,about 1.1 *** the porosity of gradient Al 2 O 3-ZrO 2 ceramic foams increasing from 75.3% to 83.0%,the compressive strength decreases from 4.4 to 2.4 MPa,and the ceramic foams can resist 8-11 repeated thermal shock from 1,100 o C to room temperature.

关键词： ceramic foam centrifugal slip casting settling velocity gradient distribution compressive property

Numerical simulation of excess-enthalpy combustion flame propagation of coal mine methane in ceramic foam

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Mining Science and Technology 2010年第2期20卷 248-253页

作者： SONG, Zhengchang LIN, Boquan school of mechanical engineering china university of mining & technologyxuzhou 221008china school of safety engineering china university of mining & technologyxuzhou 221008china

Based on the assumption of a local non-equilibrium of heat transfer between a solid matrix and gas,a mathematic model of coal mine methane combustion in a porous medium was established,as well the solid-gas boundary *** simulated numerically the flame propagation *** results show that the flame velocity in ceramic foam is higher than that of free laminar flows;the maximum flame velocity depends on the combined effects of a radiation extinction coefficient and convection heat transfer in ceramic foam and rises with an increase in the chemical equivalent *** radiation extinction coefficient cannot be used alone to determine the heat regeneration effects in the design of ceramic foam burners.

关键词： combustion ceramic foam coal mine methane numerical simulation flame propagation

Zirconium oxide ceramic foam: a promising supporting biomaterial for massive production of glial cell line-derived neurotrophic factor

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2014年第12期15卷 1013-1022页

作者： Zhong-wei LIU Wen-qiang LI Jun-kui WANG Xian-cang MA Chen LIANG Peng LIU Zheng CHU Yong-hui DANG Department of Cardiology the Third Affiliated Hospital of Xi’an Jiaotong University School of Astronautics Northwestern Polytechnic University Department of Psychiatry the First Affiliated Hospital of Xi'an Jiaotong University Department of Neurosurgery the First Affiliated Hospital of Xi'an Jiaotong University College of Medicine & Forensics Xi'an Jiaotong University Health Science Center Key Laboratory of the Health Ministry for Forensic Medicine Health Science CenterXi'an Jiaotong University MOE Key Laboratory of Environment and Genes Related to Diseases Health Science CenterXi’an Jiaotong University

This study investigated the potential application of a zirconium oxide （ZrO2） ceramic foam culturing system to the production of glial cell line-derived neurotrophic factor （GDNF）. Three sets of ZrO2 ceramic foams with different pore densities of 10, 20, and 30 pores per linear inch （PPI） were prepared to support a 3D culturing system. After primary astrocytes were cultured in these systems, production yields of GDNF were evaluated. The biomaterial bio- compatibility, cell proliferation and activation of cellular signaling pathways in GDNF synthesis and secretion in the culturing systems were also assessed and compared with a conventional culturing system. In this study, we found that the ZrO2 ceramic foam culturing system was biocompatible, using which the GDNF yields were elevated and sustained by stimulated cell proliferation and activation of signaling pathways in astrocytes cultured in the system. In conclusion, the ZrO2 ceramic foam is promising for the development of a GDNF mass production device for Parkinson＇s disease treatment.

关键词： Zirconium oxide ceramic foam Glial cell line-derived neurotrophic factor (GDNF) Parkinson's disease

Molten Salts/ceramic-foam Matrix Composites by Melt Infiltration Method as Energy Storage Material

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Journal of Wuhan University of Technology(Materials Science) 2009年第4期24卷 651-653页

作者：吴建锋 School of Materials Science and Engineering Wuhan University of Technology

A new type of high temperature energy storage material was obtained through the melt infiltration method, using compounding SiC ceramic foam as matrix and Na2SO4 as phase change material. The resulting composite material was measured by XRD, SEM, TG-DSC methods. The experimental results indicate that the composite is composed of silicon carbide, sodium sulfate and square quartz, and no chemical reactions occurs between Na2SO4 and SiC matrix. Na2SO4 has a good bonding with the SiC ceramic foam matrix. As the composite material is characterized by high thermal energy storage density and high thermal conductivity, it is suit for energy storage under high temperature.

关键词： infiltration salt/ceramics SiC energy storage phase change materials ceramic foam

Corrosion behavior of SiC foam ceramic reinforced Al-23Si composites in NaCl solution

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Journal of Central South University 2017年第9期24卷 1934-1940页

作者：诸建彬闫洪叶何远艾凡荣 School of Mechanical Electrical Engineering Nanchang University School of Mechanical Electrical Engineering Nanchang Institute of Technology

SiC foam ceramic reinforced aluminum matrix composites(SFCAMCs)were prepared by squeeze casting aluminum alloy(Al-23Si)into the SiC foam ceramic with different pore sizes,and the corrosion behavior of the SFCAMCs was studied in NaCl *** immersion corrosion tests were conducted at 20°C,50°C and 80°C,*** morphology and products were analyzed by scanning electron microscope,energy dispersive system and X-ray *** was found that the corrosion rate of SFCAMCs increases as the temperature rising,and the bigger pore size of SiC foam ceramic reinforcement,the better corrosion resistance of SFCAMCs.

关键词： SiC ceramic foam aluminum matrix composites corrosion NaCl

Red mud and fly ash-based ceramic foams using starch and manganese dioxide as foaming agent

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Transactions of Nonferrous Metals Society of China 2017年第3期27卷 591-598页

作者： Li-jun HOU Tao-yong LIU An-xian LU School of Materials Science and Engineering Central South University Changsha 410083 China

ceramic foams were prepared using red mud and fly ash as raw materials with sodium borate as sintering aid agent,starchand MnO2as foaming agent,*** influence of the amount of starch or MnO2on the crystalline phase,pore morphologyand physical–chemical porosities was *** results showed that the main crystal phases of samples with starch addition andMnO2addition were sodalite phase Na6(AlSiO4)6and Na8(SiAlO4)6MnO4,*** SEM images showed that the variation ofporous structure was mainly dominated by the addition of foaming *** the increase of foaming agent,the samples exhibitedbetter comprehensive properties:bulk density of0.59?0.96g/cm3,porosity of41.82%?63.51%,water absorption of3.16%?9.17%,compressive strength of4.22?8.38MPa,flexural strength of2.44?5.82MPa,acid resistance of95.59%?99.60%,alkali resistance of99.82%?99.99%.Based on these properties,the ceramic foams can be used in building field.

关键词： red mud fly ash starch manganese dioxide ceramic foam

Effect of Al powder and silica sol on the structure and mechanical properties of Al_2O_3-ZrO_2 foams

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Acta Metallurgica Sinica(English Letters) 2010年第4期23卷 241-247页

作者： H.Sharifi M.Divandari A.Khavandi M.H.Idris School of Materials and Metallurgical Engineering Iran University of Science and Technology Department of Material Engineering Faculty of Mechanical EngineeringUniversti Teknologi Malaysia

Polymeric sponge replication method is one of the common ways for ceramic foam production. The existence of central triangular voids in the struts results in a decrease of mechanical properties limiting their applications. To remove this defect, some additives consisting of Al powder particles and silica sol are added to ceramic slurries consisting of Al2O3 and ZrO2 （partially stabilized zirconia）. With increasing temperature for pyrolyzing and sintering of raw materials, first the Al powder and then the glass phase which consisted of melted Al2O3, ZrO2 and SiO2 was soaked into hollow struts. SEM investigations showed that the center of foam struts were free of hollows. XRD considerations depicted that a ZrO2 phase with tetragonal crystallographic structure is present in the produced foam which could be the reason of improved toughness and mechanical properties. Compressive strength of foams increased significantly due to the decrease of closed porosity. The Weibull statistical study showed remarkable increasing of the Weibull module and its value for foams with 10, 20 and 30 ppi was 5.91, 6.06 and 6.53 respectively.

关键词： ceramic foam Processing Strut structure Al2O3-ZrO2 Weibull modulus