Alloy coating for wet and high temperature pressing roll

Details Alloy coating for wet and high temperature pressing roll Alloy coating for wet and high temperature pressing roll

D - Textiles, Paper

21

F

D21F 3/08 (2006.01) C22C 38/12 (2006.01)

Patent

CA 2223907

A high temperature pressing roll (22) has a cast or formed steel roll (38) which is coated with a molybdenum-containing alloy. The preferred alloy has 14 to 16 percent molybdenum, 28 to 30 percent nickel, 30 to 34 percent chrome, 1.2 to 1.8 percent silicon, 4 to 4.5 percent boron, a maximum of 0.2 percent carbon and copper between 3 and 3.8 percent with the balance being iron. The roll is first coated with a bonding coating consisting of nickel and chromium. This bonding layer is then flame sprayed or plasma sprayed with a molybdenum alloy. The coating once applied is ground to a 30 RA or smoother surface. The mobilybdenum alloy is sprayed on to achieve a surface depth of approximately forty thousandths of an inch.

Rouleau de pressage (22) à haute température comportant un rouleau (38) en acier moulé ou profilé recouvert d'un alliage contenant du molybdène. L'alliage préféré comporte 14 à 16 % de molybdène, 28 à 30 % de nickel, 30 à 34 % de chrome, 1,2 à 1,8 % de silicium, 4 à 4,5 % de bore, au maximum 0,2 % de carbone et entre 3 et 3,8 % de cuivre, le reste étant constitué de fer. Le rouleau est d'abord recouvert d'une couche de liant constituée de nickel et de chrome. Cette couche est ensuite enduite d'un alliage au molybdène au pistolet à flamme ou pulvérisateur de plasma. Une fois appliqué, ce revêtement est poncé jusqu'à obtention d'une surface de 30 RA ou plus lisse. L'alliage contenant du molybdène est pulvérisé jusqu'à obtenir une épaisseur superficielle d'environ quarante millièmes de pouce.

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