TiO_2 粉末を用いたレーザアロイングによるアルミニウムの表面改質 Surface Modification of Aluminum by Laser Alloying with TiO_2 Powder
The aluminum surface was modified by CO<sub>2</sub> laser beam irradiation onto a surface coated 0.2mm thick with TiO<sub>2</sub> powder. Surface and cross sectional views of melted layers formed under different laser irradiating conditions were observed by optical microscope. Cross-sectional hardness was evaluated by micro-Vickers hardness measurement, and the composition was studied by microdiffraction analysis. A hard alloyed layer formed on the surface of the Al substrate at laser power exceeding 2kW. At less than 2kW, a clad layer formed. The alloyed layer consists of eutectic Al+Al<sub>3</sub>Ti. Hardening in the alloyed layer is caused by crystallization of the Al<sub>3</sub>Ti intermetallic compound formed by a reaction between substrate Al and Ti separated from TiO<sub>2</sub>. TiO<sub>2</sub> powder is thus useful in laser alloying.
- 表面技術 = The Journal of the Surface Finishing Society of Japan
表面技術 = The Journal of the Surface Finishing Society of Japan 50(3), 289-293, 1999-03-01
The Surface Finishing Society of Japan