Oxidation of stainless steel in the high velocity oxy-fuel process |
| |
Authors: | K Dobler H Kreye R Schwetzke |
| |
Affiliation: | (1) Universitat der Bundeswehr Hamburg, 22042 Hamburg, Germany;(2) Present address: St. Louis Metallizing Co., Saint Louis, MO, USA;(3) Present address: Inometa GmbH, 32052 Herford, Germany |
| |
Abstract: | The high velocity oxy-fuel (HVOF) spray process has been primarily used for the application of wear-resistant coatings and,
with the introduction of new, more powerful systems, is being increasingly considered for producing corrosion-resistant coatings.
In this study, the influence of various spray parameters for the JP-5000 and Diamond Jet (DJ) Hybrid systems on the oxidation
of stainless steel 316L is characterized. Experimental results reveal that coating oxygen contents of less than 1 wt.% can
be more easily attained with the JP-5000 than the DJ Hybrid systems because of the former’s design. In both cases, however,
the low particle temperatures necessary for low oxygen content coatings may impair bond and cohesive strength. Heat treating
the coatings after processing reduces hardness, metallurgically enhances bond strength, and enables the spheroidization of
oxide layers surrounding unmelted particles.
An empirical model describing oxidation in the thermal spray process was expanded to explain the oxidation in the HVOF spraying
of stainless steel. It was concluded that for these oxygen-sensitive materials, maintaining a relatively low particle temperature
throughout the spray process minimizes oxygen pickup by preventing an autocatalytic oxidation process and particle fragmentation
upon impact. For the DJ Hybrid systems, understoichiometric fuel settings are selected, whereas for the JP-5000, oxygen-rich
mixtures are preferred. |
| |
Keywords: | 316L corrosion HVOF oxidation stainless steel |
本文献已被 SpringerLink 等数据库收录! |
|