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Revision as of 12:29, 18 September 2014 by Smokefoot (talk | contribs) (initial merge,)(diff) ← Previous revision | Latest revision (diff) | Newer revision → (diff)Boriding, also called boronizing, is the process by which boron is introduced to a metal or alloy. It is a type of surface hardening also called case hardening. In this process boron atoms are diffused into the surface of a metal component. Once boron is present inside the surface of a metal component, it will form a surface layer of metal borides such as iron boride, nickel boride, cobalt borides, etc.. which have extremely high hardness and wear resistance. Boronized metal parts are extremely wear resistant and will often last two to five times longer than components treated with conventional heat treatments such as hardening, carburizing, nitriding, nitrocarburizing or induction hardening. Most borided steel surfaces will have iron boride layer hardnesses ranging from 1200-1600 HV. Nickel-based superalloys such as Inconel and Hastelloys will typically have nickel boride layer hardnesses of 1700-2300 HV. Boride layer depths can range from .001" to .015" inch depending on base material selection and treatment.
It is often used on steel, but is applicable to a variety of alloys and cermet materials.
Properties
- Extremely high wear resistance
- High hardness (1300-2000HV is possible)
- Resistance to high temperatures with no adverse effects up to 1200F temperature
- Increased corrosion resistance to acids
- Reduced coefficient of friction
- Increased galling / cold-welding resistance
- Possible to combine with other heat treatments such as carburizing, hardening or induction hardening to create deeper wear layers or high core hardness.
Materials compatible with boronizing
A wide range of materials suitable for treatment including plain carbon steels, alloy steels, tool steels, nickel-based super alloys, cobalt alloys, and stellite.
The following materials not compatible with boronizing: stainless steels, nitrogen, aluminum or silicon containing grades.
Applications for borided components
- High wear agricultural machinery components
- Ground engaging tooling
- Oil field drilling tools
- Ball valves for severe service
- High wear pumps
- Gears
- Valves
- Thread guides
- Coffee grinding disks
- Burner nozzles
- Plastic injection molding components
- Tools and dies
- Aluminum extrusion dies
- Aluminum diecasting shot sleeves
- Coring tines for turf management
- Steam turbine components
- Glass cutting and forming tools and dies
- Any steel components that wear quickly due to abrasion or adhesive wear and require frequent replacement
References
- http://www.bodycote.com/services/heat-treatment/case-hardening-with-subsequent-hardening-operation/boriding.aspx
- https://www1.eere.energy.gov/manufacturing/intensiveprocesses/pdfs/ultra-fast_boriding.pdf
See also
- http://bluewaterthermal.com/boronizing/
- http://www.asminternational.org/portal/site/www/AsmStore/ProductDetails/?vgnextoid=121b7e0e64e18110VgnVCM100000701e010aRCRD
- http://www.bortec.de/en/boronizing
- Matuschka, Alfred (1980). Boronizing. Hanser. ISBN 9783446131767.
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