A basic research study for improvement of plasma-sprayed zirconia coatings has been conducted. Wettability of porous Zr02-Y203 -Mn0 substrates by manganese has been investigated at 1573K by the sessile drop method. The contact angles tend to decrease gradually and stabilized at 85-90 degrees. Those values are larger than that for dense substrate. Thus the pores have a great influence on kinetics of wetting. / プラズマ溶射したセラミック皮膜の改善を目的として、多孔質セラミックと溶融マンガンの塗れ性を調べた。平滑なセラミックに比べて見かけ上ぬれにくく、平衡到達まで長時間を要することを明らかにした