Volume 39, Issue 3 (Journal of Advanced Materials-Fall 2020)
2020, 39(3): 41-54 |
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Emami M, Hayashi S. High Temperature Erosion- Oxidation Behavior of Nickel- Based Alloys Containing Mo in Fluidized Bed Waste Incineration. Journal of Advanced Materials in Engineering (Esteghlal) 2020; 39 (3) :41-54
URL: http://jame.iut.ac.ir/article-1-1081-en.html
URL: http://jame.iut.ac.ir/article-1-1081-en.html
Division of Materials Engineering, University of Bonab, Bonab, Iran. , memami@ubonab.ac.ir
Abstract: (2757 Views)
High-temperature erosion-oxidation behavior of nickel-based alloys containing 0-7 wt.% Mo in fluidized bed waste incineration conditions was studied. A stream of hot condensed air with a flow rate of 25 L/min caused hot silica sand (700 °C) mixed with 0.5 wt.% of chloride salts to hit the specimens for 250 h. By removing the erosive factor, the high-temperature oxidation behavior of the alloys in air and air-chlorine atmospheres was studied at 520 and 560 °C for 100 h. Mass gain measurement due to oxidation followed by thickness loss measurement in the erosion-oxidation tests showed that an increased Mo content led to improved oxidation resistance as a result of reduced scaling rate. However, under simultaneous oxidation and erosion conditions, the lower oxidation rate of the alloy with 7 wt.% Mo caused rapid removal of the protective scale and a reduction in erosion-oxidation resistance of the alloy. Under these conditions, the alloy with 3 wt.% Mo showed the smallest removal rate. Microscopic observations and XRD analysis confirmed formation of Cr2O3/NiCr2O4 scales on the surface. Mo-free alloy with lowest oxidation resistance showed a higher erosion-oxidation resistance. However, the high oxidation rate of this alloy led to a severe Cr-depletion and internal oxidation in subsurface region.
Keywords: High-temperature erosion-oxidation, Ni-based alloy, Element molybdenum, Fluidized bed incineration.
Type of Study: Research |
Subject:
Corrosion and degredation of materials
Received: 2020/05/7 | Accepted: 2020/10/14 | Published: 2020/12/20
Received: 2020/05/7 | Accepted: 2020/10/14 | Published: 2020/12/20
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