Components, turbochargers, and methods of forming the components
View Patent ↗Components, turbochargers, and methods of forming components are provided. In an embodiment, by way of example only, a method of forming a component is provided. The method includes applying a plurality of coated particles to a substrate, wherein each coated particle comprises a solid film lubricant particle and a layer surrounding an entire surface of the solid film lubricant particle, each solid film lubricant particle comprises at least one compound, and the layer comprises a coating material having a greater resistance to oxidation than the compound when subjected to a predetermined processing temperature and heating the substrate to the predetermined processing temperature to form a portion of a coating over the substrate.
1. A method of forming a component, the method comprising the steps of:
coating solid film lubricant particles with a particle coating material having a greater resistance to oxidation than the solid film lubricant particles when subjected to a predetermined processing temperature;
mixing the coated solid film lubricant particles with at least a first inorganic material to produce a coating powder mixture;
applying the coating powder mixture over a substrate;
heating the coating powder mixture to the predetermined processing temperature to melt the first inorganic material and form a heat-treated coating over the substrate; and
polishing a surface of the heat-treated coating to remove a portion of the particle coating material from the solid film lubricant particles located at the surface and yield a plurality of partially-surrounded solid film lubricant particles exposed through the polished surface of the heat-treated coating.
2. The method of claim 1 , further comprising obtaining the solid film lubricant particles and electrolessly plating a metal onto each solid film lubricant particle.
3. The method of claim 1 , further comprising obtaining the solid film lubricant particles and electrolytically plating a metal onto each solid film lubricant particle.
4. The method of claim 1 , wherein the coated particles include at least one compound having a chemical formula M n+1 AX n , wherein M is at least one early transition metal selected from groups IIIB, IVB, VB, and VIB, A is at least one element selected from groups IIIA, IVA, VA, VIA, and VIIA, X is one or both of carbon and nitrogen, and n is an integer between 1 and 3.
5. The method of claim 4 , wherein the metal is selected from the group consisting of nickel, gold, silver, platinum, and palladium.
6. The method of claim 1 , further comprising:
mixing a plurality of the solid film lubricant particles into a liquid phase of the particle coating material to form a colloid or suspension; and
drying the colloid or suspension to form the plurality of coated particles.
7. The method of claim 6 , wherein the material is a compound selected from the group consisting of an inorganic material, a ceramic, and a silica.
8. The method of claim 1 , wherein the solid film lubricant particles comprise at least one aluminum-based compound selected from the group consisting of Cr 2 AlC, V 2 AlC, Ti 2 AlC, Ti 3 AlC 2 , Ti 4 AlN 3 , Ta 2 AlC, Ta 4 AlC 3 , and Ti 2 AlN.
9. The method of claim 1 , further comprising mixing the plurality of coated particles with an organic binder.
10. The method of claim 1 , wherein the step of mixing comprises mixing the coated solid film lubricant particles and the inorganic material with a liquid to form a paste, and wherein the step of applying the coating powder mixture comprises applying the paste to the substrate by a screen printing process.
11. The method of claim 1 , wherein the step of mixing the coated solid film lubricant particles comprises mixing the coated solid film lubricant particles with an inorganic eutectic mixture to produce the coating powder mixture.
12. The method of claim 11 , wherein the inorganic eutectic mixture comprises a fluoride glass.
13. A method for forming a foil bearing having a low-friction coating, the method comprising:
coating solid film lubricant particles with a particle coating material having an oxidative resistance exceeding that of the solid film lubricant particles;
mixing the coated solid film lubricant particles with at least a first inorganic eutectic material and a liquid to produce a paste;
applying the paste over a substrate;
heating the paste to a temperature sufficient to melt the first inorganic eutectic material and form a heat-treated coating over the substrate;
polishing a surface of the heat-treated coating to remove the particle coating material from portions of the solid film lubricant particles located at the surface; and
forming the coated substrate into the foil bearing.