Mechanical part with a nanostructured TiO2—CR2O3 ceramic coating and method for depositing a nanostructured TiO2—CR2O3 ceramic coating on a substrate
AssigneeVelan Inc.
InventorsLuc Vernhes, Nicolas Lourdel, Rogerio S. Lima, Dominique Poirier
Life of this patent
Estimating the term…
Abstract
There is provided a method for depositing a TiO2—Cr2O3 ceramic coating on a substrate. The method includes mixing a powder of sprayable nanostructured titanium(IV) oxide (n-TiO2) and a powder of chromium(III) oxide (Cr2O3), thereby obtaining a n-TiO2—Cr2O3 powder blend. The method also includes thermal spraying particles of the n-TiO2—Cr2O3 powder blend on the substrate at an in-flight particle temperature of or greater than 2350° C. and a particle in-flight velocity of or greater than 350 m/s, thereby obtaining a coated substrate.
Claims19
A method for depositing a nanostructured titanium (IV) oxide (n-TiO2)-chromium (III) oxide (Cr2O3) coating on a mechanical part of a High-Pressure Acid Leach (HPAL) metal-seated ball valve, the method comprising:
- a step (a) of mixing a powder of sprayable nanostructured titanium (IV) oxide (n-TiO2) and a powder of micron-sized chromium (III) oxide (Cr2O3), thereby obtaining a powder blend of sprayable nanostructured titanium (IV) oxide (n-TiO2)-chromium (III) oxide (Cr2O3), wherein the powder blend consists of 50 wt % to 60 wt % of nTiO2 and 40 wt % to 50 wt % of Cr2O3, and
- a step (b) of thermal spraying particles of the n-TiO2—Cr2O3 powder blend onto a mechanical part of the valve, the mechanical part being subjected to wear due to friction with other parts of the valve during operation of the valve, by air plasma spraying (APS) at an average in-flight particle temperature between 2400° C. and 2800° C. and an average particle in-flight velocity of or greater than 350 m/s;
- wherein the n-TiO2—Cr2O3 coating is a two-phase coating having a n-TiO2 phase and a Cr2O3 phase,
- and wherein the step (a) precedes the step (b).
Dependencies are inferred from the claim text.