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A friction-enhancing lacquer contains a binder and hard material particles. The hard material particles include a titanium-boron compound or consist essentially of a titanium-boron compound, such as titanium diboride. The friction-enhancing lacquer is applied to the surface of a machine part, such a

A friction-enhancing lacquer contains a binder and hard material particles. The hard material particles include a titanium-boron compound or consist essentially of a titanium-boron compound, such as titanium diboride. The friction-enhancing lacquer is applied to the surface of a machine part, such as a bearing inner ring, outer ring or other bearing component, in order to increase its coefficient of friction and minimize or prevent slippage relative to another machine part clamped thereto. Also a bearing component coated with such a lacquer.

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1. A bearing component comprising: a bearing inner ring or a bearing outer ring having a coating, the coating comprising a layer of a moisture-curing one-component polyurethane system that contains hard material particles made of a titanium-boron compound. 2. The bearing component according to claim

1. A bearing component comprising: a bearing inner ring or a bearing outer ring having a coating, the coating comprising a layer of a moisture-curing one-component polyurethane system that contains hard material particles made of a titanium-boron compound. 2. The bearing component according to claim 1, wherein the hard material particles include titanium boride or consist essentially of titanium boride. 3. The bearing component according to claim 1, wherein the coating further comprises an anticorrosive material. 4. The bearing component according to claim 3, wherein the anticorrosive material comprises zinc. 5. The bearing component according to claim 4, wherein at least a portion of the zinc is in lamellar form. 6. The bearing component according to claim 1, wherein the hard material particles have: a Knoop hardness HK 0.1 of at least 2000 N/mm2 or a Mohs-hardness of at least 8.0 and a specific electrical resistance of at most 1×10-4 Ωcm at room temperature. 7. The bearing component according to claim 1, wherein the coating contains additional hard material particles as a further ingredient. 8. The bearing component according to claim 1, wherein the hard material particles include titanium boride or consist essentially of titanium boride and wherein the layer has a thickness of 20 μm to 45 μm and wherein the hard material particles have a mesh size of 400. 9. The bearing component according to claim 1, wherein the coating is a friction-enhancing coating. 10. The bearing component according to claim 1, wherein the hard material particles include microserrations. 11. A bearing component comprising: a bearing inner ring or a bearing outer ring having a coating, the coating comprising a layer of a one-component polyurethane system that contains hard material particles made of a titanium-boron compound,wherein portions of the hard material particles protrude from at least one surface of the layer. 12. The bearing component according to claim 11, wherein the coating further comprises zinc. 13. The bearing component according to claim 12, wherein the coating further comprises zinc in lamellar form. 14. The bearing component according to claim 11, wherein the one-component polyurethane system is a moisture-curing one-component polyurethane system. 15. The bearing component according to claim 11, wherein the hard material particles include titanium boride or consist essentially of titanium boride. 16. The bearing component according to claim 11, wherein the coating further comprises an anticorrosive material. 17. The component according to claim 11, wherein the hard material particles include microserrations. 18. A bearing assembly comprising: a housing having an opening having a radially inner surface; anda bearing mounted in the housing opening and comprising a bearing inner ring having a radially inner surface and a bearing outer ring having a radially outer surface,wherein at least one surface selected from the group consisting of the radially inner surface of the housing and the radially outer surface of the bearing outer ring and the radially inner surface of the bearing inner ring includes a friction-enhancing coating, the friction-enhancing coating comprising a layer of a moisture-curing one-component polyurethane system that contains hard material particles made of a titanium-boron compound.