Enhancement of Heat Dissipation from Computer Processor using Layer Copper-Aluminum Composite Materials

In order to make full use of the wear resistance and antifriction of the mixed reinforced particles, improve the performance and utilization rate of the composite material, and reduce its wear amount, in this study, graphite and aluminum composite materials with different graphite concentration were prepared by powder metallurgy process. On this basis, the influence of different graphite concentration on the friction coefficient and wear amount of composite samples and different load on the wear amount of composite materials were discussed and analyzed. The results show that with the increase of graphite content, the friction coefficient and wear amount of the composite will decrease correspondingly. When the load is less than 30 N, the wear curve of the sample changes steadily. When the load is more than 30 N, the wear will increase sharply. Therefore, the analysis of the tribological properties of the graphite and aluminum composites based on the powder metallurgy process plays an important role in improving the utilization rate of the composite and reducing its wear.

Download Full-text

ASME 1992 Nadai Lecture—Micromechanics of Inelastic Composite Materials: Theory and Experiment

Journal of Engineering Materials and Technology ◽

10.1115/1.2904226 ◽

1993 ◽

Vol 115 (4) ◽

pp. 327-338 ◽

Cited By ~ 24

Author(s):

George J. Dvorak

Keyword(s):

Composite Materials ◽

General Procedure ◽

Local Fields ◽

Field Analysis ◽

Plastic Strains ◽

Inelastic Behavior ◽

Aluminum Composite ◽

Plastic Strain Increment ◽

Multiphase Materials ◽

Transformation Field Analysis

Some recent theoretical and experimental results on modeling of the inelastic behavior of composite materials are reviewed. The transformation field analysis method (G. J. Dvorak, Proc. R. Soc. London, Series A437, 1992, pp. 311–327) is a general procedure for evaluation of local fields and overall response in representative volumes of multiphase materials subjected to external thermomechanical loads and transformations in the phases. Applications are presented for systems with elastic-plastic and viscoelastic constituents. The Kroner-Budiansky-Wu and the Hill self-consistent models are corrected to conform with the generalized Levin formula. Recent experimental measurements of yield surfaces and plastic strains on thin-walled boron-aluminum composite tubes are interpreted with several micromechanical models. The comparisons show that unit cell models can provide reasonably accurate predictions of the observed plastic strains, while models relying on normality of the plastic strain increment vector to a single overall yield surface may not capture the essential features of the inelastic deformation process.

Download Full-text

502 Characteristic of Strength of CNT/Aluminum Composite Materials

Proceedings of the 1992 Annual Meeting of JSME/MMD ◽

10.1299/jsmezairiki.2006.0_261 ◽

2006 ◽

Vol 2006 (0) ◽

pp. 261-262

Author(s):

Katsuhiko SASAKI ◽

Terumitsu IMANISHI ◽

Kazuaki KATAGIRI ◽

Toyohiro SATOH ◽

Akiyuki SHIMIZU ◽

...

Keyword(s):

Composite Materials ◽

Aluminum Composite

Download Full-text

Aluminum composite materials for multichip modules

JOM ◽

10.1007/bf03222271 ◽

1992 ◽

Vol 44 (7) ◽

pp. 24-28 ◽

Cited By ~ 61

Author(s):

M. K. Premkumar ◽

W. H. Hunt ◽

R. R. Sawtell

Keyword(s):

Composite Materials ◽

Multichip Modules ◽

Aluminum Composite

Download Full-text

A Novel Forming Process of Copper Cladding Aluminum Composite Materials with Core-Filling Continuous Casting

Materials Science Forum ◽

10.4028/www.scientific.net/msf.539-543.956 ◽

2007 ◽

Vol 539-543 ◽

pp. 956-961 ◽

Cited By ~ 9

Author(s):

Jian Xin Xie ◽

Chung Jing Wu ◽

Xue Feng Liu ◽

Xin Hua Liu

Keyword(s):

Composite Materials ◽

Continuous Casting ◽

Bonding Strength ◽

Thickness Distribution ◽

Liquid Aluminum ◽

Interfacial Bonding ◽

Core Material ◽

Forming Process ◽

Aluminum Composite ◽

Interfacial Bonding Strength

To simplify forming process of cladding materials with high performance, such as copper cladding aluminum composite materials, and to improve the interface quality of cladding materials, a novel forming process called Core-Filling continuous Casting (CFC) for bimetal composite materials is proposed. A conceptual equipment is developed, and the forming of composite bars of copper cladding aluminum is investigated. The basic technique theory of CFC, the reaction and bonded state of interface and the interfacial bonding strength of the cladding materials, as well as the influences of technological parameters are analyzed. The composite bars of copper cladding aluminum with 24mm in diameter of core material and 8mm in thickness of cladding layer are successfully fabricated. The results show that: (i) the proposed CFC process is feasible in principle; (ii) the composite bars of copper cladding aluminum having metallurgical bonding interfaces can be fabricated by CFC process under the conditions of liquid copper temperature of 1250~1300°C, liquid aluminum temperature of about 700°C and drawing velocity of 12~24mm/min; (iii) the copper layer thickness distribution is uniform both in the directions of portrait and circumference and (iv) the interfacial bonding strength is higher than that of core aluminum.

Download Full-text