Korea Institute of Science and Technology

Jin-Kook Yoon

Kyung-Hwan Lee

Jae-Chul Lee

Ji Young Byun

Hyun-Kwang Seok

Ho-In Lee

Jae Soo Kim

Kyung-Tae Hong

Ji-Young Byun

Jong Chul Shin

Jung-Man Doh

Jong Kown Lee

Kyeung Ho Kim

Dae Ho Rho

Doo Yong Kim

Gyeung-Ho Kim

Jong-Kwon Lee

Keun-Hyung Son

A MoSi&#x2014;SiNcomposite coating which is coated on a surface of base materials. The MoSi&#x2014;SiNcomposite coating on the surface of the base material can be formed by forming a MoN diffusion layer by vapor-depositing of nitrogen on the surface of the base material and forming a MoSi&#x2014;SiNcomposite coating by vapor-depositing of silicon on the surface of the MoN diffusion layer, or the MoSi&#x2014;SiNcomposite coating on the surface of the base material can be formed by forming a MoSidiffusion layer by vapor-depositing of silicon on a surface of a base material by the CVD method, transforming the MoSidiffusion layer into a MoSidiffusion layer by heating under a high-purity hydrogen or argon atmosphere, forming a MoSi&#x2014;SiNcomposite diffusion layer by vapor-depositing of nitrogen on the surface of the MosSidiffusion layer by the CVD method and forming a MoSi&#x2014;SiNcomposite coating by vapor-depositing of silicon on the surface of the MoSi&#x2014;SiNcomposite diffusion layer.

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The embodiments of the invention relate to a MoSi-SiC nanocomposite coating layer formed on surfaces of refractory metals such as Mo, Nb, Ta, W and their alloys. The MoSi-SiC nanocomposite coating layer is manufactured by forming a molybdenum carbide (MoC and MoC) coating layers on the surfaces of the substrates at high temperature, and the subsequent vapor-deposition of Si. The MoSi-SiC nanocomposite coating layer has a microstructure in which SiC particles are mostly located on the equiaxed MoSigrain boundary. The MoSi-SiC nanocomposite coating layer can have a close thermal expansion coefficient to that of the substrate by controlling a volume fraction of SiC particles exisiting in the nanocomposite coating. As a result, the generation of cracks due to the mismatch in the thermal expansion coefficients between the substrate and the nanocomposite coating layer is suppressed and the high-temperature repeated thermal cyclic oxidation resistance and the low-temperature oxidation resistance of the coated substrate are improved.

In a method for fabricating a Si&mdash;Al alloy packaging material, by adding Al&mdash;Si alloy powders to Si powders and pressurizing-forming it, or by pressurizing-filling Si powders or a preforming body of Si powders with Al&mdash;Si alloy melt, a Si&mdash;Al alloy packaging material having good characteristics can be obtained.

Method for fabricating Al-Si alloy packaging material

Growing community of inventors

Seoul, South Korea

Jin-Kook Yoon