Paper Title:
Processing of Lightweight Metal Matrix Composites via In Situ Gas/Liquid Reaction
  Abstract

Aluminum nitride (AlN) possesses superior thermal and electrical properties and is an ideal candidate for high-temperature, as well as for packaging and optoelectronic applications. Aluminum based composites reinforced with AlN have been manufactured via an in situ gas-assisted process, where a nitrogen-bearing gas is injected in the molten aluminum at 1273-1323 K. The process is carried out in an inert atmosphere in order to avoid oxygen contamination. Addition of Mg lowered the oxygen content in the melt by forming MgO and thus favoring the nitridation reaction. Particle size formed in the matrix varied from 1- 3 μm to sub-micron scale depending on the gas injection time. Longer bubbling times give rise to improved reinforcement dispersion. Addition of Si is detrimental for the synthesis of AlN; Mg2Si phase precipitates, replacing the formation of MgO and hindering the nitridation reaction. The challenges of controlling the kinetics are discussed.

  Info
Periodical
Edited by
Lorella Ceschini and Roberto Montanari
Pages
115-123
DOI
10.4028/www.scientific.net/MSF.678.115
Citation
C. Borgonovo, D. Apelian, "Processing of Lightweight Metal Matrix Composites via In Situ Gas/Liquid Reaction", Materials Science Forum, Vol. 678, pp. 115-123, 2011
Online since
February 2011
Export
Price
$32.00
Share

In order to see related information, you need to Login.

In order to see related information, you need to Login.

Authors: Woo Gwang Jung, Hoon Kwon
Abstract:BN/Al(-Mg) metal matrix composite (MMC) was fabricated by the pressureless infiltration technique. The phase characterizations of the...
301
Authors: C.A. León, Y. Arroyo, E. Bedolla, E.A. Aguilar, Robin A.L. Drew
Abstract:A novel ceramic-metal composite with continuous interconnected ceramic and metal phases has been fabricated from sintered porous particulate...
105
Authors: Dong Bok Lee
Abstract:Metal matrix composites (MMCs) consisting of an Al matrix reinforced with initially added BN particles and newly formed AlN dispersoids were...
657
Authors: Shan Zheng, Lian Gao, Hiroshi Watanabe, Junichi Tatami, Toru Wakihara, Katsutoshi Komeya, Takeshi Meguro
Abstract:Dense and homogenous Si3N4-TiN composites (5 vol% TiN) were prepared by using in situ synthesis method from Si3N4, AlN and TiO2 mixtures,...
115
Authors: Ramana G. Reddy, V. Kumar
Abstract:Aluminum alloys were reinforced with AlN particles using a novel chemical in situ technique. Thermodynamic analyses were made to identify...
701