Press roll with ceramic coating, a method for manufacturing...

Details Press roll with ceramic coating, a method for manufacturing... Press roll with ceramic coating, a method for manufacturing...

D - Textiles, Paper

21

G

D21G 1/02 (2006.01) C23C 4/10 (2006.01) D21F 3/08 (2006.01)

Patent

CA 2234888

A press roll for a paper or board machine, a method for manufacturing a roll for a paper or board machine and a coating composition for a roll which enable the roll to endure difficult corrosion conditions. An adhesion/corrosion-protection layer having a thickness of from about 150µm to about 300µm is applied onto the frame part of the roll by a high-velocity flame spraying technique. The adhesion/corrosion-protection layer contains a nickel- chromium alloy. A tight-ceramic layer having a thickness from about 50 µm to about 150 µm is applied onto the adhesion/corrosion-protection layer by a high-velocity flame spraying technique and includes from about 50% to about 100% of Al2O3 and optionally includes up to about 50% of TiO2 and/or any amount of Al2TiO5. A porous ceramic layer is applied onto the tight ceramic layer. The tight- ceramic layer may include only Al2TiO5 instead of Al2O3, with or without TiO2.

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