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US 11,192,792 B2Granted
Boronizing powder compositions for improved boride layer quality in oil country tubular goods and other metal articles
AssigneeBWT Aktiengesellschaft
InventorsCraig Zimmerman, Nick Bugliarello-Wondrich, Jeff Hemmer
Life of this patent
Estimating the term…
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.
Claims13
A powder boronizing composition comprising:
- a. 0.5 to 4.5 wt % of a boron source selected from B4C, amorphous boron, calcium hexaboride, Na2B4O7·10H2O or mixtures thereof;
- b. 45.5 to 88.5 wt % of a diluent selected from SiC, alumina, zirconia or mixtures thereof;
- c. 1.0 to 20.0 wt % of an activator selected from KBF4, ammonia chloride, cryolite, sodium fluoride, ammonium bifluoride, potassium fluoride, or mixtures thereof;
- and
- d. 10.0 to 30.0 wt % of a sintering reduction agent selected from carbon black, graphite, activated carbon, charcoal or mixtures thereof, wherein the powder boronizing composition produces a boride layer of 0.008 to 0.020 in, and the ratio of component (d)/component (a) is 2.2 to 60.0.
2 more elements
Dependencies are inferred from the claim text.