電子ビーム粒子注入の基礎的研究

概要

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Ceramic powder is added into an electron beam melted pool and mixed with substrate material. The injection requires the powder to stay in the resolidified surface layer without being completely decomposed. Several kinds of ceramic are tried into steel substrate, and TiN and TiC are successfully injected. Three powder supplying methods are studied for TiN injection into steel. They are : (1) feeding by mechanical vibration, (2) preplacing on the substrate fixed with water glass, and (3) preplacing on the substrate covered with thin plate of material similar to the substrate. The evaluation is based on the measured portion of TiN particle in unit area. The third method shows the most injected TiN particle portion. The reason is considered to be effective suppression of scattering of the powder by the cover plate. Water glass fixing of powder does not suppress the scattering sufficiently. Mechanical vibration feeding is too weak to force powder into the melt pool. The uniformity of distribution of injected TiN is low. However the uniformity becomes higher as injected volume of TiN increases.
公益社団法人精密工学会の論文
1999-05-05