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http://dx.doi.org/10.4191/KCERS.2006.43.6.358

Characteristics of Two-Step Plasma-Assisted Boronizing Process in an Atmosphere of BCl3-H2-Ar  

Nam, Kee-Seok (Surface Engineering Department, Korea Institute of Machinery and Materials)
Lee, Gu-Hyun (Surface Engineering Department, Korea Institute of Machinery and Materials)
Shin, Pyung-Woo (Department of Metallurgy and Materials Engineering, Changwon National University)
Song, Yo-Seung (Department of Materials Engineering, Hankuk Aviation University)
Kim, Bae-Yeon (Department of Advanced Materials Engineering, University of Incheon)
Lee, Deuk-Yong (Department of Materials Engineering, Daelim College of Technology)
Publication Information
Journal of the Korean Ceramic Society / v.43, no.6, 2006 , pp. 358-361 More about this Journal
Abstract
A two-step plasma-assisted boronizing process was carried out on the AISI 1045 steel substrate to reduce the pore density introduced by a conventional single plasma boronizing process. The specimens were plasma boronized for 1 h at $650^{\circ}C$ and subsequently far 7 h at $800^{\circ}C$ in an atmosphere of $BCl_3-H_2-Ar$. The boride layer thickness was parabolic in boronizing time, a high HV reading of 1540 was found up to the boride layer thickness of $25{\mu}m$. It was found that the morphology of the boride layer prepared by the two-step boronizing process was changed from a columnar to a tooth-like structure and the pores in the borided steel were eliminated completely in comparison to those synthesized by the conventional single boronizing process, implying that it is highly applicable for enhancing the dense and compact coating properties of the low-alloy steel.
Keywords
Boron trichloride; Plasma boronizing; Two-temperature-stage process; Pores;
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