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Abstract

A roll for use in the manufacture of paper and board, a press roll, in particular a center roll in a press, a backup roll for an extended-nip press roll, a hot press roll, or equivalent, which is in direct contact with a wet paper web, or a calender roll, a method for manufacturing the same and a coating composition therefor including an adhesion layer arranged on the frame part of the roll and a ceramic layer arranged on the adhesion layer. The ceramic layer has a thickness of from about 100 .mu.m to about 2000 .mu.m and includes from about 50% to about 95% by weight of Cr.sub.2 O.sub.3 and from about 3% to about 50% by weight of TiO.sub.2, or from about 50% to about 80% by weight of Al.sub.2 O.sub.3 and from about 20% to about 50% by weight of ZrO.sub.2, or exclusively Al.sub.2 TiO.sub.5. The outer face of the ceramic layer is finished until the roughness Ra is from about 0.2 .mu.m to about 2.0 .mu.m and/or the porosity of the outer face of the roll is from about 1% to about 20%. In addition to or instead of TiO.sub.2, the ceramic layer may contain oxides of aluminum, silicon, zirconium, magnesium, manganese, tin, tungsten and mixtures thereof.

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First Claim