Abstract: A powder boronizing composition comprising: a. 0.5 to 4.5 wt % of a boron source selected from B4C, amorphous boron, calcium hexaboride, borax or mixtures thereof; b. 45.5 to 88.5 wt % of a diluent selected from SiC, alumina or mixtures thereof; c. 1.0 to 20.0 wt % of an activator selected from KBF4, ammonia chloride, cryolite or mixtures thereof; and d. 10.0 to 30.0 wt % of a sintering reduction agent selected from carbon black, graphite or mixtures thereof.
Type:
Grant
Filed:
March 12, 2018
Date of Patent:
December 7, 2021
Assignee:
BWT LLC
Inventors:
Craig Zimmerman, Nick Bugliarello-Wondrich, Jeff Hemmer
Abstract: A process comprising: placing a boronizing powder composition in the interior of a metal pipe comprising a first end, a second end, an inside surface and an outside surface; heating the pipe in a vessel having an interior, to a temperature from 1400° F. to 1900° F., thereby forming spent boronizing reaction gases and a borided layer on the inside surface, wherein the vessel interior has an atmosphere that surrounds the outside surface of the metal pipe; and flowing the spent boronizing reaction gases into the atmosphere surrounding the outside surface of the pipe, thereby forming an oxygen-depleted atmosphere.
Type:
Grant
Filed:
March 12, 2018
Date of Patent:
December 22, 2020
Assignee:
BWT LLC
Inventors:
Craig Zimmerman, Jim Hedman, Nick Bugliarello-Wondrich, Jeff Hemmer