研究目的
Investigating the scratch resistance and damage mechanisms of laser remelted thermally sprayed ceramic coatings, specifically alumina and chromia, under various loading conditions.
研究成果
Laser remelting significantly improves the scratch resistance, failure load, cohesive strength, and wear resistance of thermally sprayed alumina and chromia coatings by enhancing mechanical properties and modifying microstructure. Failure mechanisms include plastic deformation, tensile cracking, and spallation, with improvements attributed to reduced porosity and phase changes.
研究不足
The study is limited to specific ceramic coatings (alumina and chromia) and may not generalize to other materials. The laser remelting parameters and testing conditions are fixed, and potential variations in real-world applications are not explored. Data sharing is restricted due to ongoing research.
1：Experimental Design and Method Selection:
The study involved scratch testing under constant and variable loads, ball-on-disc wear testing, and characterization of coatings using techniques like microhardness testing, X-ray diffraction, and scanning electron microscopy. Theoretical models for indentation fracture toughness and Rietveld analysis were employed.
2：Sample Selection and Data Sources:
Coatings were deposited on low carbon steel substrates using flame and plasma spraying with alumina and chromia powders. Samples were prepared by cutting, polishing, and laser remelting.
3：List of Experimental Equipment and Materials:
Equipment included a scratch tester, microhardness tester, X-ray diffractometer, SEM, ball-on-disc tribometer, laser system, and various polishers. Materials included alumina and chromia powders, Ni-Al bond coat, and steel substrates.
4：Experimental Procedures and Operational Workflow:
Coatings were deposited, remelted with a laser, characterized for microstructure and mechanical properties, subjected to scratch tests at different loads and speeds, and wear tests. Data on failure load, wear area, and cohesive strength were collected.
5：Data Analysis Methods:
Data were analyzed using statistical methods for averages and standard deviations, Rietveld refinement for phase analysis, and software for modulus calculation from indentation tests.
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SEM
EVO 15
Zeiss
Used for scanning electron microscopy to examine scratch tracks and worn surfaces.
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laser system
YLR 2000
IPG Photonics
Used for laser remelting of coatings.
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surface profilometer
FORM TALYSURF 50 (INTRA 2) 3D profilometer
TAYLOR HOBSON
Used to measure scratch wear rate of coatings.
暂无现货
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optical microscope
Zeiss Axio. Vert.A1
Zeiss
Used for microstructural study of polished cross-sections.
暂无现货
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scratch tester
TR-101-M5
Ducom
Used for scratch testing of coatings under constant and variable loads.
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microhardness tester
MVH-S-AUTO
Omnitech
Used to measure microhardness and indentation fracture toughness of coatings.
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X-ray diffractometer
Empyrean Cu LFF HR (9430 033 7310x) DK411025
Netherlands
Used for phase analysis of coatings using X-ray diffraction.
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ball-on-disc tribometer
DUCOM Tribometer
Ducom
Used for tribological testing of coatings.
暂无现货
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instrumented hardness tester
Micro Combi Tester
CSM Instruments
Used to measure moduli of elasticity from indentation tests.
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X-ray tomography instrument
phoenix v?tome?x
GE
Used to measure porosity of coatings.
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diamond cutter
IsoMet diamond wafering blades
Buehler
Used to cut samples from coated coupons.
暂无现货
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grit blasting chamber
Sandstorm
Bangalore
Used for grit blasting substrates prior to coating deposition.
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plasmatron
9 MB
Oerlikon Metco
Used for plasma spraying of coatings.
暂无现货
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ultrasonic agitator
Used for cleaning substrates in 2-propanol solution.
暂无现货
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surface grinding machine
COSMOS EARTH
India
Used for grinding coatings prior to polishing.
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