| 摘要 |
PURPOSE:To form a thermally sprayed ceramic coating layer having improved adhesion and capable of preventing peeling and cracking on the surface of a metallic base material by making the surface of the base material uneven so as to form recessed and projecting having prescribed dimensions and by thermally spraying ceramic powder on the uneven surface. CONSTITUTION:The surface of a metallic base material 1 is made uneven so as to form recesses 2 and projections 3 at about 0.8-1.0mm pitch. The depth A of the recesses 2 is regulated to about 0.3mm and the angle theta of each top of the projections 3 to <=about 90 deg.. A thermally sprayed thin layer 4a of a brazing filler metal which reacts with the base material 1 and ceramic powder to be thermally sprayed is formed on the uneven surface and the ceramic powder is thermally sprayed on the layer 4a to form a thermally sprayed ceramic coating layer 4b'. Thus, a ceramic layer 4 having satisfactory adhesion and capable of preventing peeling is obtd. on the surface of the base material 1. The layer 4 has high strength even when the thickness is increased.
|
