Wear resistant low friction coating composition, coated components, and method for coating thereof
View Patent ↗A composition for coating sliding or rolling or fretting or impacting members is formed by preparing a composite powder of TiB2 and BN, with a TiB 2 to BN ratio ranging from 1:7 to 20:1, and a metallic matrix selected from the group consisting of nickel, chromium, iron, cobalt, aluminum, tungsten, carbon and alloys thereof.
1. A coating composition for use on a contact surface, comprising 5 to 60 wt % total of composite powder having an average primary particle size ranging from 1 to 1000 μm, the balance comprising (i) a matrix-forming metal, metal alloy or high-temperature polymer, and (ii) a binder chosen from an acrylate resin, a methacrylate resin, a thermally cured phosphate binder, a thermally cured potassium silicate binder, or mixtures of two or more thereof; wherein the composite powder comprises TiB 2 and BN in a ratio of BN to TiB 2 of 1:7 to 20:1.
2. The coating composition of claim 1 , wherein the composite powder has a BET surface area of 0.1 to 20.0 m 2 /g.
3. The coating composition of claim 2 , wherein the composite powder has a BET surface area of 0.3 to 7.0 m 2 /g.
4. The coating composition of claim 1 , wherein the matrix-forming metal alloy is an alloy selected from the group consisting of W, Co, Cr, Fe, Ni, Mo, Al, Si, Cu, Y, Ag, P, Zr, Hf, B, Ta, V, Nb, and alloys thereof.
5. The coating composition of claim 1 , wherein the matrix-forming metal is selected from the group consisting of Ni, Co, Fe and alloys thereof.
6. The coating composition of claim 1 , wherein the matrix-forming high-temperature polymer is selected from the group consisting of polyimides, polyamide imides, polyester imides, aromatic plastics, and mixtures thereof.
7. The coating composition of claim 1 , wherein the matrix-forming metal alloy further comprises a high-temperature polymer selected from the group consisting of polyimides, polyamide imides, polyester imides, aromatic plastics, and mixtures thereof, in an amount of 1 to about 30 wt % of the composition.
8. The coating composition of claim 1 , wherein the composite powder comprises TiB 2 and BN in a ratio of BN to TiB 2 of 1:6 to 9:1.
9. The coating composition of claim 8 , wherein the composite powder comprises TiB 2 and BN in a ratio of BN to TiB 2 of 1:5 to 8:1.
10. The coating composition of claim 1 , wherein the composite powder has an average primary particle size ranging from 10 to 800 μm.
11. The coating composition of claim 10 , wherein the composite powder has an average primary particle size ranging from 20 to 500 μm.
12. The coating composition of claim 1 , wherein the composite powder has an average primary particle size ranging from 3 to 10 μm.
13. The coating composition of claim 1 , wherein the composite powder has a mechanical strength of >50 MPa.
14. The coating composition of claim 1 , wherein the composite powder is generated from one of scrapped metallization boats, scrapped side dams, and mixtures thereof.
15. The coating composition of claim 1 , wherein the composite powder is from scrapped materials containing:
10-60 wt. % BN;
1 to 60 wt. % of TiB 2 ;
0 to 60 wt. % of at least one of a nitride of the elements Al, Si, Fe, Co, Ni and mixtures thereof; and
30-70 wt. % of at least a material selected from the group of borides of Ti, Zr, Al, Cr and mixtures thereof, carbides of Si, Ti, and Cr and mixtures thereof.
16. The coating composition of claim 1 , wherein the composite powder is from scrapped materials containing:
TiB 2 , and BN, at least one of aluminum nitride or silicon nitride;
at least a metal selected from W, Fe, Co, Nb, Mo, Hf, V and Ta; and
at least an oxide selected from the group of CaO, MgO, Al 2 O 3 , TiO 2 , Y 2 O 3 , YAG (Al 5 Y 3 O 12 ), YAP(AlYO 3 ), and YAM(Al 2 Y 4 O 7 ), compounds and mixtures thereof.
17. The coating composition of claim 1 , wherein the composite powder further comprises at least one of nickel, chromium, iron, cobalt, aluminum and alloys thereof.
18. A coating composition for use on a contact surface, the composition comprising:
a compound powder mixture comprising a metallic matrix selected from the group consisting of nickel, chromium, iron, cobalt, aluminum, tungsten and alloys thereof, a binder chosen from an acrylate resin, a methacrylate resin, a thermally cured phosphate binder, a thermally cured potassium silicate binder, or mixtures of two or more thereof, and a composite powder of TiB 2 and BN; wherein the metallic component is present from 40 to 95 wt. % of the final coating composition and the TiB 2 to BN ratio in the composite powder of TiB 2 and BN is in the range of 1:7 to 20:1.