レーザ溶射法による組成傾斜皮膜の作成 : チタン・窒化チタン系溶射皮膜の耐熱衝撃特性

概要

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Compositionally gradient coatings for thermal shock have been developed by a laser spraying method. They consist of titanium and titanium nitride. A pure titanium wire was melted by a high-energy-density carbon dioxide laser beam. An argon stream produced a fine spray of melted titanium particles which coated a mild steel substrate (60 x 60 x 4.5 mm) . The next layer was a mixture of titanium and titanium nitride which was formed by the mixed gas of argon and nitrogen. The last layer was coated with nitrogen only. The chemical components of each layer were graded through the coatings (about 1 mm thick). They were heated to 2000 K by a laser beam whose diameter and power density were about 42 mm and 290 W/cm^2, respectively, and cooled to room temperature in water. As a result of the repeating thermal shock test, it was found that these laser-sprayed coatings are excellent as thermal barrier coatings.
一般社団法人日本機械学会の論文
1992-10-25