ارزيابي مقاومت به اكسايش پيوسته پوشش پاشش حرارتي Mo-si-B روي فولاد ساده كربني

Isothermal oxidation behavior of plasma-sprayed Mo-Si-B intermetallic coatings on plain steel

In this study, Mo-14Si-10B and Mo-57Si-10B (at%) elemental powders were separately milled using an attritor mill Mechanically alloyed powders were agglomerated and annealedThen, powders of Mo-Si-B as alloyed (with composites) and agglomerated (without composites) were plasma sprayed onto plain carbon steels. The samples, both coated and non- coated\ were subjected to isothermal oxidation tests. Metallurgical characteristics of powders and coatings were evaluated by SEM and XRD. Plasma-sprayed Mo-Si-B coatings (with phases of MoSi2, MosSi3, MoB and Mo5SiB2) greatly improved the oxidation resistance of the plain steel substrates, but plasma-sprayed Mo-Si-B coatings (without any phases) did not significantly improve the oxidation rate of substrates. Also, the kinetics and composition of the oxide-scale have been found to depend on the alloy composition.