US 12,345,219 B2
Coating system for refractory metals
Charles Clifford Berger, New City, NY (US)
Assigned to Hitemco, LLC, Old Bethpage, NY (US)
Filed by Hitemco, LLC, Old Bethpage, NY (US)
Filed on Aug. 7, 2018, as Appl. No. 16/057,047.
Claims priority of provisional application 62/542,134, filed on Aug. 7, 2017.
Prior Publication US 2019/0040817 A1, Feb. 7, 2019
Int. Cl. F02K 9/97 (2006.01)
CPC F02K 9/974 (2013.01) [F05D 2230/90 (2013.01); F05D 2300/13 (2013.01); F05D 2300/173 (2013.01); F05D 2300/2112 (2013.01); F05D 2300/611 (2013.01)] 20 Claims
OG exemplary drawing
 
12. A method of forming a protective coating on a substrate material, the method comprising the steps of:
providing a bed of solid particulate material comprising a combination of solid aluminum metal and a solid aluminum halide activator;
bringing a coating chamber to a diffusion temperature with the substrate material and the bed of particulate material inside the chamber, wherein the aluminum halide activator sublimes and reacts with the aluminum metal in the bed of particulate material to form a vapor comprising aluminum from the aluminum metal in addition to aluminum from the aluminum halide activator,
whereby aluminum from said vapor diffuses into the substrate material to form an aluminide diffusion coating,
wherein the method is a non-contact vapor phase aluminide process in which the substrate material does not contact the solid aluminum metal or the solid aluminum halide activator in the bed of particulate material.