Roll comprising an abradable coating
AssigneeVesuvius France
InventorsJean-denis Nicolas, Gilbert Rancoule, Christian Berry
Life of this patent
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Abstract
A protective and abradable coating composition is suitable for application on rolls and more particularly for application on conveyor rolls. The abradable coating is suitable for use in high temperature applications. Rolls incorporating the coating may be produced and used according to disclosed processes and procedures. Application of the composition to rolls reduces corrosion by aluminium melt, and enables the removal of built-up substances by friction. The life time of the roll is thereby increased.
Claims14
-14. (canceled)
Roll with at least a layer of a coating that is abradable after 3 hours at 800° C., wherein the coating comprises
- a) 83 -98 wt % of an aggregate comprising particles of a material selected from the group consisting of Si3N4, SiC or SiAlON and a mixture thereof,
- b) 2 -17 wt % of submicronic particles of a material selected from the group consisting of Al2O3, SiO2, ZrO2, CeO2, Y2O3 and a mixture thereof.
Composition comprising
- a) 50-75 wt % of an aggregate comprising particles of a material selected from the group consisting of Si3N4, SiC, SiAlON and a mixture thereof,
- b) 1.5-10 wt % of submicronic particles of a material selected from the group consisting of Al2O3, SiO2, ZrO2, CeO2, Y2O3 and a mixture thereof, abd
- c) 15-48.5 wt % H2O,
- characterized in that the particles of Si3N4, SiC, SiAlON and a mixture thereof have a specific surface area (BET) in the range from and including 0.5 m2/g to and including 8 m2/g.
Process for manufacturing a roll comprising the steps of:
- a) providing a roll made of a material selected from the group consisting of fused silica, mullite, sillimanite, alumina, SIC matrix and metal, wherein the roll comprises a core and a surface;
- b) applying on at least a portion of a surface of the roll, a composition comprising
- a) 50-75 wt % of an aggregate comprising particles of a material selected from the group consisting of Si3N4, SIC, SiAlON and a mixture thereof,
- b) 1.5-10 wt % of submicronic particles of a material selected from the group consisting of Al2O3, SiO2, ZrO2, CeO2, Y2O3 and a mixture thereof, abd
- c) 15-48.5 wt % H2O,
- characterized in that the particles of Si3N4, SIC, SiAlON and a mixture thereof have a specific surface area (BET) in the range from and including 0.5 m2/g to and including 8 m2/g;
- and
- c) drying the roll.
Dependencies are inferred from the claim text.