The Experts below are selected from a list of 3498 Experts worldwide ranked by ideXlab platform
Pierre Fauchais - One of the best experts on this subject based on the ideXlab platform.
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Influence of the metallic matrix ratio on the wear resistance (Dry and slurry Abrasion) of plasma sprayed cermet (chromia/stainless steel) coatings
Surface and Coatings Technology, 2006Co-Authors: Hélène Ageorges, Pavel Ctibor, Zouhair Medarhri, Said Touimi, Pierre FauchaisAbstract:Abstract This work is related to the manufacturing and tribological testing of plasma sprayed cermet coatings of chromium oxide and stainless steel in order to obtain wear resistant coatings to Dry and slurry Abrasion. Raw materials were fused and crushed powders of chromium oxide (Cr 2 O 3 ) with a particle size ranging from 20 to 45 μm and gas atomized stainless steel (iron base with 17 wt.% of Cr and 12 wt.% of Ni) with a particle size distribution between 20 and 53 μm. Both powders were simultaneously injected with two separated injectors in a direct current (DC) plasma jet (Ar–H 2 (25 vol.%) at atmospheric pressure (APS). The influence, on the coating micro-structural and tribological properties, of various stainless steel weight percentages in chromium oxide has been studied. All coatings exhibited a lamellar structure with a random distribution of the two materials. The effect of the percentage of stainless steel on the microstructure of the coating, studied by scanning electron microscopy (SEM), has shown that increasing the stainless steel percentage increased the coating cohesion. The increase of Cr 2 O 3 in the coatings resulted in higher hardness and in lower weight losses during wear tests in Dry Abrasion. The study has also shown that the optimum stainless steel percentages in coatings were not identical to reach their maximum resistance to slurry or Dry Abrasion.
Marius Buchmann - One of the best experts on this subject based on the ideXlab platform.
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residual stresses in aluminium phosphate sealed plasma sprayed oxide coatings and their effect on abrasive wear
Wear, 2002Co-Authors: S. Ahmaniemi, Teemu Mäntylä, Minnamari Vippola, Petri Vuoristo, Marius BuchmannAbstract:Effect of residual stresses on plasma sprayed alumina and chromia coatings sealed with aluminium phosphate were studied as a function of the temperature of the sealing treatment. Stresses were measured by X-ray stress analysis and high-speed circular microhole drilling method. Residual stress states were correlated with other coating properties such as microhardness, porosity, microstructure and Dry Abrasion wear resistance. Correlations were found between sealing treatment temperature, residual stress state and wear resistance. Wear resistance of the oxide coatings was increased at all sealing temperatures. Sealing treatment affected coatings by two mechanisms. Aluminium phosphate sealing induced compressive stresses to coatings and simultaneously bonded coating lamellar structure.
S. Ahmaniemi - One of the best experts on this subject based on the ideXlab platform.
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residual stresses in aluminium phosphate sealed plasma sprayed oxide coatings and their effect on abrasive wear
Wear, 2002Co-Authors: S. Ahmaniemi, Teemu Mäntylä, Minnamari Vippola, Petri Vuoristo, Marius BuchmannAbstract:Effect of residual stresses on plasma sprayed alumina and chromia coatings sealed with aluminium phosphate were studied as a function of the temperature of the sealing treatment. Stresses were measured by X-ray stress analysis and high-speed circular microhole drilling method. Residual stress states were correlated with other coating properties such as microhardness, porosity, microstructure and Dry Abrasion wear resistance. Correlations were found between sealing treatment temperature, residual stress state and wear resistance. Wear resistance of the oxide coatings was increased at all sealing temperatures. Sealing treatment affected coatings by two mechanisms. Aluminium phosphate sealing induced compressive stresses to coatings and simultaneously bonded coating lamellar structure.
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Wet Abrasion and slurry erosion resistance of thermally sprayed oxide coatings
Wear, 1999Co-Authors: Jari Knuuttila, S. Ahmaniemi, Teemu MäntyläAbstract:Abstract Wet Abrasion and slurry erosion resistance of alumina and chromia coatings were studied and compared to their Dry Abrasion resistance. Bulk oxide ceramics and base metals were used for comparison. The coatings were produced by atmospherical plasma spraying. The effect of aluminum phosphate sealing treatment on the wear and corrosion behaviour of the coatings were also studied. In wet Abrasion tests kaolin–water and silica–water mixtures were used as the abrasive media. Slurry erosion tests were performed using a slurry pot tester. Quartz sand, alumina and alumina–zirconia in water with various pH values were used as the erosive medium. Dry Abrasion tests were performed using a rubber wheel Abrasion equipment and quartz abrasive. The coatings and bulk ceramics were characterized for their phase structure, porosity and hardness. The results from wear tests are reported and correlated with coating and bulk ceramic properties. The influence of coating post-treatment to wear behaviour is also presented and discussed.
Teemu Mäntylä - One of the best experts on this subject based on the ideXlab platform.
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residual stresses in aluminium phosphate sealed plasma sprayed oxide coatings and their effect on abrasive wear
Wear, 2002Co-Authors: S. Ahmaniemi, Teemu Mäntylä, Minnamari Vippola, Petri Vuoristo, Marius BuchmannAbstract:Effect of residual stresses on plasma sprayed alumina and chromia coatings sealed with aluminium phosphate were studied as a function of the temperature of the sealing treatment. Stresses were measured by X-ray stress analysis and high-speed circular microhole drilling method. Residual stress states were correlated with other coating properties such as microhardness, porosity, microstructure and Dry Abrasion wear resistance. Correlations were found between sealing treatment temperature, residual stress state and wear resistance. Wear resistance of the oxide coatings was increased at all sealing temperatures. Sealing treatment affected coatings by two mechanisms. Aluminium phosphate sealing induced compressive stresses to coatings and simultaneously bonded coating lamellar structure.
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Wet Abrasion and slurry erosion resistance of thermally sprayed oxide coatings
Wear, 1999Co-Authors: Jari Knuuttila, S. Ahmaniemi, Teemu MäntyläAbstract:Abstract Wet Abrasion and slurry erosion resistance of alumina and chromia coatings were studied and compared to their Dry Abrasion resistance. Bulk oxide ceramics and base metals were used for comparison. The coatings were produced by atmospherical plasma spraying. The effect of aluminum phosphate sealing treatment on the wear and corrosion behaviour of the coatings were also studied. In wet Abrasion tests kaolin–water and silica–water mixtures were used as the abrasive media. Slurry erosion tests were performed using a slurry pot tester. Quartz sand, alumina and alumina–zirconia in water with various pH values were used as the erosive medium. Dry Abrasion tests were performed using a rubber wheel Abrasion equipment and quartz abrasive. The coatings and bulk ceramics were characterized for their phase structure, porosity and hardness. The results from wear tests are reported and correlated with coating and bulk ceramic properties. The influence of coating post-treatment to wear behaviour is also presented and discussed.
Hélène Ageorges - One of the best experts on this subject based on the ideXlab platform.
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Influence of the metallic matrix ratio on the wear resistance (Dry and slurry Abrasion) of plasma sprayed cermet (chromia/stainless steel) coatings
Surface and Coatings Technology, 2006Co-Authors: Hélène Ageorges, Pavel Ctibor, Zouhair Medarhri, Said Touimi, Pierre FauchaisAbstract:Abstract This work is related to the manufacturing and tribological testing of plasma sprayed cermet coatings of chromium oxide and stainless steel in order to obtain wear resistant coatings to Dry and slurry Abrasion. Raw materials were fused and crushed powders of chromium oxide (Cr 2 O 3 ) with a particle size ranging from 20 to 45 μm and gas atomized stainless steel (iron base with 17 wt.% of Cr and 12 wt.% of Ni) with a particle size distribution between 20 and 53 μm. Both powders were simultaneously injected with two separated injectors in a direct current (DC) plasma jet (Ar–H 2 (25 vol.%) at atmospheric pressure (APS). The influence, on the coating micro-structural and tribological properties, of various stainless steel weight percentages in chromium oxide has been studied. All coatings exhibited a lamellar structure with a random distribution of the two materials. The effect of the percentage of stainless steel on the microstructure of the coating, studied by scanning electron microscopy (SEM), has shown that increasing the stainless steel percentage increased the coating cohesion. The increase of Cr 2 O 3 in the coatings resulted in higher hardness and in lower weight losses during wear tests in Dry Abrasion. The study has also shown that the optimum stainless steel percentages in coatings were not identical to reach their maximum resistance to slurry or Dry Abrasion.
