Understanding AlN Obtaining Through Computational Thermodynamics Combined with Experimental Investigation

International Conference on Innovative Research - ICIR Euroinvent 2017

Florea, R.M.^1

Gheorghe Asachi Technical University of Iasi, Department of Materials Science and Engineering, Prof. Dr. D-tru Mangeron Street, Iasi

700050, Romania^1

关键词: Aluminum matrix composites;    Computational thermodynamics;    Experimental investigations;    High flexural strength;    High thermal conductivity;    Thermal expansion coefficients;    Thermodynamic database;    Thermodynamic modelling;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/209/1/012011/pdf
DOI  :  10.1088/1757-899X/209/1/012011

来源: IOP

【 摘 要 】

Basic material concept, technology and some results of studies on aluminum matrix composite with dispersive aluminum nitride reinforcement was shown. Studied composites were manufactured by "in situ" technique. Aluminum nitride (AlN) has attracted large interest recently, because of its high thermal conductivity, good dielectric properties, high flexural strength, thermal expansion coefficient matches that of Si and its non-toxic nature, as a suitable material for hybrid integrated circuit substrates. AlMg alloys are the best matrix for AlN obtaining. Al2O3-AlMg, AlN-Al2O3, and AlN-AlMg binary diagrams were thermodynamically modelled. The obtained Gibbs free energies of components, solution parameters and stoichiometric phases were used to build a thermodynamic database of AlN- Al2O3-AlMg system. Obtaining of AlN with Liquid-phase of AlMg as matrix has been studied and compared with the thermodynamic results. The secondary phase microstructure has a significant effect on the final thermal conductivity of the obtained AlN. Thermodynamic modelling of AlN-Al2O3-AlMg system provided an important basis for understanding the obtaining behavior and interpreting the experimental results.