Claims
- 1. A steel bearing member having an erosion resistant surface, comprising:
a bearing substrate; a first overlay of hardbanding material on the bearing substrate, the first overlay having greater than 65% sintered cemented metal carbide pellets dispersed in steel, the cemented metal carbide pellets containing hard submicron sized particles; and a second overlay of steel on the first overlay, a portion of the second overlay containing hard submicron sized particles that migrated from the first overlay during application of the second overlay to form with the first overlay a steel hybrid matrix of tungsten, carbon and steel.
- 2. The bearing member of claim 1 wherein the first overlay is applied to a bearing to bearing surface.
- 3. The bearing member of claim 1 wherein the bearing substrate is a female portion of a radial bearing assembly.
- 4. The bearing member of claim 1 wherein the hard submicron sized particles of the sintered cemented metal carbide pellets are chosen from the group of cobalt carbide, tungsten carbide, nickel carbide, chromium carbide and mixtures thereof.
- 5. The bearing member of claim 1 wherein the hard particles are in an amount exceeding about 80% by weight of the cemented metal carbide pellets.
- 6. The bearing member of claim 1 wherein the average particle size of the hard particles is less than about 1 micron in diameter.
- 7. A radial bearing having an erosion resistant surface made by the method comprising the steps of:
a first overlay of hardbanding material to a bearing substrate, the first overlay having greater than 65% sintered cemented metal carbide pellets dispersed in steel, the cemented metal carbide pellets containing hard submicron sized particles; and applying to the first overlay a second overlay of steel using a heat process whereby a portion of the hard submicron sized particles migrates into a portion of the second overlay and forms with the first overlay, a steel hybrid matrix of tungsten, carbon and steel.
- 8. The radial bearing of claim 7 that includes the step of machining a surface of the second overlay.
- 9. The radial bearing of claim 7 wherein the bearing substrate is a female bearing member.
- 10. The radial bearing of claim 7 wherein the hard particles of the cemented metal carbide pellets are chosen from the group of cobalt carbide, tungsten carbide, nickel carbide, chromium carbide and mixtures thereof.
- 11. The radial bearing of claim 7 wherein the average particle size of hard particles is less than about 1 micron in diameter.
- 12. The radial bearing of claim 8 wherein the machining step includes machining the surface of the second overlay so as to substantially remove steel not formed into the steel hybrid matrix of tungsten, carbon and steel.
- 13. The radial bearing of claim 7 wherein the step of applying the second overlay includes welding.
- 14. The radial bearing of claim 7 wherein the step of applying the first overlay includes welding.
- 15. The radial bearing of claims 13 wherein the welding includes metal inert gas welding or plasma arc welding.
- 16. The radial bearing of claims 14 wherein the welding includes metal inert gas welding or plasma arc welding.
- 17. The radial bearing of claim 8 wherein the machining step includes grinding.
- 18. The radial bearing of claim 7 wherein the heat process provides substantially no visual delineation between the first and second overlays.
- 19. The radial bearing of claim 18 wherein the first and second overlays have a thickness in combination of less than {fraction (3/16)} of an inch after machining.
- 20. The radial bearing of claim 7 wherein the step of applying the first overlay includes thermal spraying.
- 21. The radial bearing of claim 7 wherein the sintered cemented metal carbide pellets comprise at least about 80 weight percent tungsten carbide.
- 22. The radial bearing of claim 7 further comprising the step of applying a third overlay of hardbanding material to the second overlay.
- 23. The radial bearing of claims 8 further comprising the step of applying a third overlay of hardbanding material after machining or grinding the surface.
- 24. The radial bearing of claims 12 further comprising the step of applying a third overlay of hardbanding material after machining or grinding the surface.
- 25. The radial bearing of claims 17 further comprising the step of applying a third overlay of hardbanding material after machining or grinding the surface.
Parent Case Info
[0001] This application is a continuation in part of U.S. patent application Ser. No. 09/585,067 filed Jun. 1, 2000, which was a divisional of U.S. patent application Ser. No. 09/089,998 that was filed Jun. 3, 1998, and issued as U.S. Pat. No. 6,117,493 on Sep. 12, 2000.
Divisions (1)
|
Number |
Date |
Country |
Parent |
09089998 |
Jun 1998 |
US |
Child |
09585067 |
Jun 2000 |
US |
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
09585067 |
Jun 2000 |
US |
Child |
09969394 |
Oct 2001 |
US |