Claims
- 1. A method for the manufacture of a roll used in a paper making machine, said method comprising the steps of:
- forming on a center roll body mantle a corrosion protection layer; and
- forming a surface layer on said corrosion protection layer by thermal spraying of powder particles wherein metal and ceramic phases are in each powder particle.
- 2. The method of claim 1, further comprising forming said corrosion protection layer by deposition welding.
- 3. The method of claim 1, further comprising forming said corrosion protection layer by lining said mantle with steel sheets.
- 4. The method of claim 1, further comprising machining said corrosion protection layer into an appropriate shape before forming said surface layer thereon.
- 5. The method of claim 1, further comprising forming said corrosion protection layer by thermal spraying.
- 6. The method of claim 1, further comprising densifying said corrosion protection layer by melting.
- 7. The method of claim 6, wherein said melting is laser, induction, plasma, flame or electron beam melting.
- 8. The method of claim 1, further comprising impregnating a fluoroplastic into said surface layer.
- 9. The method of claim 1, further comprising impregnating a phenol resin into said surface layer.
- 10. The method of claim 1, further comprising forming a separate adhesive layer between said surface layer and said corrosion protection layer.
- 11. The method of claim 1, further comprising forming said corrosion protection layer by using stainless steel having a chromium content of 10 to 29%.
- 12. The method of claim 1, further comprising the steps of providing said ceramic phase with sufficient amount of carbides having a suitably small particle size such that a surface layer having a microhardness greater than about 900 HV 0.3 is achieved, and providing said corrosion protection layer with a sufficient thickness such that it is reweldable when the surface layer is worn through.
- 13. The method of claim 1, further comprising the step of providing said corrosion protection layer with an open porosity having a surface area of less than about 4% of the surface area of said corrosion protection layer.
- 14. The method of claim 1, wherein the ceramic phase of said surface layer is selected from carbides selected from the group consisting of tungsten, chromium, titanium, niobium, boron, and a mixture of any of the foregoing carbides.
- 15. The method of claim 1, wherein the metal phase of said surface layer is a metallic matrix obtained by alloying a metal selected from the group consisting of nickel, cobalt, iron and alloys of any of the foregoing, with a transition metal selected from the group consisting of group 4b, group 5b, group 6b of the periodic system of the elements, and mixtures of any of the foregoing.
- 16. The method of claim 1, wherein the ceramic phase of each particle has a size of about 1 to about 10 .mu.m.
- 17. The method of claim 1, further comprising the step of forming the powder particles by agglomeration.
- 18. The method of claim 1, further comprising the step of forming the powder particles by agglomeration and sintering.
- 19. The method of claim 1, further comprising the step of forming the powder particles by spheroidizing, sintering and crushing.
- 20. The method of claim 1, further comprising the step of forming the powder particles by the so-gel-method.
Priority Claims (1)
Number |
Date |
Country |
Kind |
895104 |
Oct 1989 |
FIX |
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Parent Case Info
This is a division, of application Ser. No. 07/599,628, filed Oct. 18, 1990, now U.S. Pat. No. 5,111,567.
US Referenced Citations (7)
Divisions (1)
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Number |
Date |
Country |
Parent |
599628 |
Oct 1990 |
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