| 摘要 |
PROBLEM TO BE SOLVED: To greatly reduce a generation amount of vacancy in a ceramic insulation layer, in an insulation rolling bearing for electrolytic corrosion prevention forming the insulation layer.SOLUTION: In an insulation rolling bearing for electrolytic corrosion prevention, an insulation layer is an insulation film in which electromelting alumina is subjected to spray coating; the alumina purity of the electromelting alumina is 99 mass% or more; NaOcontained as an impurity is 0.5 mass% or less; FeOis 0.1 mass% or less; SiOis 0.4 mass% or less; a particle size is sized to 5-100 μm; and the density of a sized primary particle is 60% or more with respect to the true specific gravity of alumina. |
