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Fabrication of aluminum matrix composite reinforced with carbon nanotubes

Rare Metals 2007年第5期26卷 450-455页

作者： DENG Chunfeng ZHANG Xuexi MA Yanxia WANG Dezun School of Materials Science and Engineering Harbin Institute of Technology Harbin 150001 China Luoyang Ship Material Research Institute Luoyang 471039 China

1.0wt.% carbon nanotube （CNT） reinforced 2024Al matrix composite was fabricated by cold isostatic press and subsequent hot extrusion techniques. The mechanical properties of the composite were measured by a tensile test. Mean-while,the fracture surfaces were examined using field emission scanning electron microscopy. The experimental results show that CNTs are dispersed homogeneously in the composite and that the interfaces of the Al matrix and the CNT bond well. Although the tensile strength and the Young’s modulus of the composite are enhanced markedly,the elongation does not decrease when compared with the matrix material fabricated under the same process. The reasons for the increments may be the extraordinary mechanical properties of CNTs,and the bridging and pulling-out role of CNTs in the Al matrix composite.

关键词： composites carbon nanotube composite cold isostatic press hot extrusion fracture surface

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Shape Forming and Microwave Sintering of Thin Wall Tubular Lithium Aluminate

Shape Forming and Microwave Sintering of Thin Wall Tubular L...

引用

The 3～〔rd〕International Conference on High-Performance Ceramics(CICC-3)（1）

作者： Yunhan Ling Wei Lin Zuozhong Jiang and Xinde Bai Department of Materials Science & Engineering Tsinghua University Beijing 100084 P. R. China

＜正＞ Thin wall tubular Lithium aluminate ceramics have special application background. The microwave synthesis of LiAlO2 ultrafine powder, shape forming and microwave sintering of lithium aluminate pipes with 1mm in thickness were conducted in this paper. The results showed: （1） A controllable ratio of alpha to gamma phase LiAlO2 with average particle size of 0.3 μm can be synthesized via microwave radiation at temperature of 650-800℃within an hour;（2） cold press and cold isostatic press are feasible methods to form LiAlO2 thin-wall tube and their mechanical properties are superior to those molded via hot pressure casting. （3） Lithium aluminate ceramic was successfully fabricated via microwave sintering, a uniform crystal size within 2-4μm, a typical bimodal pore size distribution and a average compressive strength more than 600MPa were obtained at 1300℃for 30min.

关键词： Lithium aluminate shape forming cold isostatic press microwave sintering.

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