Surface modification of 2.25Cr1Mo by diffusion of Al and Si using a one step pack cementation process to improve the oxidation resistance
- Unidad Merida (Mexico)
- Research Centre Juelich GmbH (Germany). Inst. of Materials for Energy Systems
The development of modern industrial processes require higher oxidation resistance materials. Fe-Al-Si alloys have shown better oxidation resistance than ordinary Fe-Al binary alloys. However, high concentrations of Al and Si may result in adverse effects on the mechanical properties of the alloy. Pack Cementation Process (PCP) has been used as a method to prepare diffusion coatings With a combination of beneficial elements such as Al and Si. These additions can increase the oxidation resistance of relatively economical low alloyed steels. In addition, this diffusion coating does not significantly change the mechanical properties of the alloy. Using a pack with composition 10 Al-50Si (wt %) as a Masteralloy, 4 NH{sub 4}F as an activator and 86 Al{sub 2}O{sub 3} as an inert filler, a diffusion coating with composition Fe-24Al-4Si was incorporated in a Fe-2.25Cr-1Mo steel. This process was done at 1,000 C for 8 hours under an argon atmosphere. Cyclic oxidation tests of this material showed that the Fe-24Al-4Si coating the oxidation properties of the 2.25Cr1Mo steel, decreasing its oxidation rate in air at 600 C by forming an external protective layer of {alpha}-Al{sub 2}O{sub 3} instead of Fe{sub 2}O{sub 3}.
- OSTI ID:
- 397807
- Report Number(s):
- CONF-960389--
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ALUMINIUM ALLOYS
ALUMINIUM OXIDES
AMMONIUM FLUORIDES
DEPOSITION
EXPERIMENTAL DATA
IRON ALLOYS
IRON OXIDES
OPTICAL MICROSCOPY
OXIDATION
POWDERS
PROTECTIVE COATINGS
SAMPLE PREPARATION
SCALING
SCANNING ELECTRON MICROSCOPY
SILICON ALLOYS
STEEL-CR2MO
SURFACE COATING
WEIGHT MEASUREMENT
X-RAY DIFFRACTION
X-RAY SPECTROSCOPY