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- W1996722338 abstract "Changes of atmosphere composition during sintering of water atomized powder prealloyed with Mn and Cr (up to 2% of both) were studied. Increasing sensitivity to atmosphere purity with increasing alloying elements content was registered. Continuous monitoring of sintering atmosphere composition (CO/CO2/H2O) indicates three critical stages during the heating up to final sintering temperature: the importance of rapid atmosphere purification after lubricant decomposition and removal; the reduction of the iron oxide layer by hydrogen at temperatures up to ∼500 °C and by carbon at temperatures around ∼720 °C; the reduction of the spinel oxides on the powder surface at above 900 °C and further reduction of thermodynamically stable surface oxides and mixed internal oxides close to the sintering temperature. The measured ratio of CO/CO2 indicates favorable thermodynamic conditions for reduction of stable oxides as (Cr,Mn)xOy close to sintering temperature (1120 °C) for the applied sintering conditions. The experimental results were confirmed by modeling the metal–gas interactions using the thermodynamic/thermochemical softwares ThermoCalc and HSC Chemistry. The modeling indicates the significance of maintaining a sintering atmosphere with high reducing potential during heating stage for minimizing oxidation before high-temperature carbothermal reduction starts." @default.
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- W1996722338 date "2012-04-01" @default.
- W1996722338 modified "2023-10-09" @default.
- W1996722338 title "On-line control of processing atmospheres for proper sintering of oxidation-sensitive PM steels" @default.
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- W1996722338 doi "https://doi.org/10.1016/j.jmatprotec.2011.12.008" @default.
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