US 11,753,306 B2
Preparation of metal diboride and boron-doped powders
Randolph Carlton McGee, Hamden, CT (US)
Assigned to Raytheon Technologies Corporation, Farmington, CT (US)
Filed by Raytheon Technologies Corporation, Farmington, CT (US)
Filed on Jun. 17, 2021, as Appl. No. 17/350,469.
Application 17/350,469 is a division of application No. 16/268,224, filed on Feb. 5, 2019, granted, now 11,066,308.
Prior Publication US 2021/0309531 A1, Oct. 7, 2021
Int. Cl. C01B 35/00 (2006.01); C01B 35/04 (2006.01)
CPC C01B 35/04 (2013.01) [C01P 2006/32 (2013.01); C01P 2006/40 (2013.01)] 19 Claims
OG exemplary drawing
 
1. An assembly for producing a metal boride powder, the assembly comprising:
a first fluidized bed reactor configured to produce a boriding gas stream from a first powder;
a second fluidized bed reactor fluidly coupled to the first fluidized bed reactor through a first conduit configured to deliver the boriding gas stream to the second fluidized bed reactor, wherein the second fluidized bed reactor is configured to mix the boriding gas stream with a second powder selected from the group consisting of metal oxides, metal hydroxides, and alloys, to produce a metal boride powder or boron-doped powder;
a bypass conduit fluidly connecting the first conduit to an exhaust vent, thereby bypassing the second fluidized bed reactor; and
a valve configured to alternatively direct gas from the first fluidized bed reactor to the exhaust vent and to the second fluidized bed reactor.