Formation and Characterization of Corrosion-Resistant Amorphous Coatings by Thermal Spraying∗

Luster, Jörg; Heath, G.R.; Kammer, P. A.

doi:10.1080/10426919608947532

Cited by 15 publications

(6 citation statements)

References 10 publications

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“…It is also of great interest to exploit the excellent mechanical properties and corrosion resistance of amorphous alloys in the form of protective codttings. Consequently, a variety of technologies have been used to produce such coatings [1]. Thermal spraying is probably the most economical method for th~ production of thick (0.05-2 ram) surface layers .…”

Section: Introductionmentioning

confidence: 99%

Characterization of Fe-Cr-B based coatings produced by HVOF and PTA processes

Grossi

Kweon

1999

Metals and Materials

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Two Fe-Cr-B based gas atomized powders, Armacor M and 16, were thermally sprayed on a low carbon steel substrate, using the HVOF (High Velocity Oxygen Fuel) process. Armacor M was also weld-surfaced with the PTA (Plasma Transferred Arc) process. The resultant deposits were subsequently characterized, using X-ray diffraction, scanning electron microscopy, and microhardness measurement. The effects of heat treatment were also studied for HVOF-sprayed coatings. The wear performance of the coatings was investigated by two-body abrasive wear tests. The results of microstructural analysis of as-sprayed deposits revealed oxide and boride phases such as Fe304 and Crl.65Feo.35Bc~.~, in an ~ matrix for the HVOF-sprayed Armacor 16 coating, and only the boride phases (Cr1.65F%35B0.~6 and Cr~B) in an tx matrix for the HVOFsprayed Armacor M coating. PTA weld-surfaced Armacor M coating contains needle-type long precipitates of Cr~B and Crl.65Fe0.3~B~).9~, in the a matrix. The hardness of the HVOF-sprayed Armacor 16 coating after heat treatment was substantially less than that of the as-sprayed coating due to the phase transformation from tx to y phase. Heat treatments of the HVOF-sprayed Armacor M coating did not produce changes in phase and its hardness decreased as compared to that of the as-sprayed coating. While HVOF-sprayed and PTA weld-surfaced Armacor M coatings have the same hardness, the latter shows better abrasive wear resistance because of the size and orientation of its boride phases. The broadening of the XRD patterns and the increase in hardness after wear testing suggest that the transformation from the crystalline to the amorphous structure occurred on the uppermost layer during wear testing.

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Section: Introductionmentioning

confidence: 99%

Characterization of Fe-Cr-B based coatings produced by HVOF and PTA processes

Grossi

Kweon

1999

Metals and Materials

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“…Crushed BMG coating was heated up at a rate of 10 K/s under inert gas purging. Amorphous phase fraction was calculated from DSC data [9,10]. The amorphous fraction is calculated from the ratio of H of initial powder/coating to the H of powder (less than 25 m which is fully amorphous).…”

Section: Methodsmentioning

confidence: 99%

Phase dependence of Fe-based bulk metallic glasses on properties of thermal spray coatings

Kumar

Kim

et al. 2009

Journal of Alloys and Compounds

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“…In order to evaluate the effects of the crystallinity of the BMG coating on the tribological behavior, scratch test was conducted for the as-sprayed coating, a partially crystallized coating, and a fully crystallized coating: the amorphous phase fraction of the partially crystallized BMG coating is 80 vol.% and the other crystallized coating is fully crystallized according to Ref. [3]. For the scratch test, a diamond tip having a radius of 200 m was slid onto the specimens at loading speed of 3.33 N s −1 and at scanning rate of 0.167 mm s −1 .…”

Section: Methodsmentioning

confidence: 99%