J0401-1-3 コールドスプレー粒子/基材界面の微細組織観察([J0401-1]固相粒子成膜技術とその応用(1):粒子付着因子の検討)

概要

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Cold spraying has been developed as a high-quality coating process. However, the bonding mechanisms of cold sprayed solid particles have not been clarified yet. In this study, copper particles were deposited on an aluminum nitride substrate coated by the sputtering of copper and titanium at a low pressure of less than 1.0 MPa, making this approach suitable for a wide range of engineering applications. The interfacial boundaries were carefully observed in thin foils from the cross sections of the specimen with a high-resolution transmission electron microscope (TEM). The cold-sprayed copper particles are connected directly without any oxidation film due to the appearance of new metallic surfaces. A wavy boundary was observed between cold-sprayed copper and the substrate, as seen in the joint boundary by explosive welding, which is caused by shear instability. TEM data clearly revealed some phenomena related to the impact of spraying powder toward the substrate.
一般社団法人日本機械学会の論文
2010-09-04