The Experts below are selected from a list of 13215 Experts worldwide ranked by ideXlab platform
Torjus Åkre - One of the best experts on this subject based on the ideXlab platform.
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Sandblasting effect on performance and durability of ti based iro2 ta2o5 anode in acidic solutions
Electrochimica Acta, 2019Co-Authors: Geir Martin Haarberg, Svein Sunde, Frode Seland, Arne Peter Ratvik, Susanne Holmin, John Gustavsson, Åsa Afvander, Erik Zimmerman, Torjus ÅkreAbstract:Abstract The effect of applying Sandblasting during pretreatment while preparing titanium based IrO 2 − Ta 2 O 5 anodes by the conventional method was investigated. It was observed that Sandblasting influences the surface morphology both before and after coating as deeper and smaller etching pits are obtained on the substrate before coating process and rougher surface is obtained after coating. As a result larger outer electrochemical active surface area (ECSA) is obtained on the anodes with Sandblasting, which was determined based on cyclic voltammetry, whereas the inner ECSA is independent of the pretreatment. The polarization measurements in a quasi-steady state reveal that Sandblasting has slight influence on the catalytic activity. Accelerated lifetime tests were carried out in acidic 0.9 mol L−1 Na2SO4 solution (pH = 2) at a current density of 5 × 107 A cm−2 under galvanostatic conditions. It shows that Sandblasting would shorten the lifetime of the anode due to oxidation of the titanium substrate. This is suggested to be due to the shorter distance between the lowest spot of the outer coating surface and the highest spot of the outer substrate of the anode after applying Sandblasting in titanium substrate pretreatment.
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Sandblasting effect on performance and durability of Ti based IrO2−Ta2O5 anode in acidic solutions
Electrochimica Acta, 2019Co-Authors: Geir Martin Haarberg, Svein Sunde, Frode Seland, Arne Peter Ratvik, Susanne Holmin, John Gustavsson, Åsa Afvander, Erik Zimmerman, Torjus ÅkreAbstract:Abstract The effect of applying Sandblasting during pretreatment while preparing titanium based IrO 2 − Ta 2 O 5 anodes by the conventional method was investigated. It was observed that Sandblasting influences the surface morphology both before and after coating as deeper and smaller etching pits are obtained on the substrate before coating process and rougher surface is obtained after coating. As a result larger outer electrochemical active surface area (ECSA) is obtained on the anodes with Sandblasting, which was determined based on cyclic voltammetry, whereas the inner ECSA is independent of the pretreatment. The polarization measurements in a quasi-steady state reveal that Sandblasting has slight influence on the catalytic activity. Accelerated lifetime tests were carried out in acidic 0.9 mol L−1 Na2SO4 solution (pH = 2) at a current density of 5 × 107 A cm−2 under galvanostatic conditions. It shows that Sandblasting would shorten the lifetime of the anode due to oxidation of the titanium substrate. This is suggested to be due to the shorter distance between the lowest spot of the outer coating surface and the highest spot of the outer substrate of the anode after applying Sandblasting in titanium substrate pretreatment.
Geir Martin Haarberg - One of the best experts on this subject based on the ideXlab platform.
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Sandblasting effect on performance and durability of ti based iro2 ta2o5 anode in acidic solutions
Electrochimica Acta, 2019Co-Authors: Geir Martin Haarberg, Svein Sunde, Frode Seland, Arne Peter Ratvik, Susanne Holmin, John Gustavsson, Åsa Afvander, Erik Zimmerman, Torjus ÅkreAbstract:Abstract The effect of applying Sandblasting during pretreatment while preparing titanium based IrO 2 − Ta 2 O 5 anodes by the conventional method was investigated. It was observed that Sandblasting influences the surface morphology both before and after coating as deeper and smaller etching pits are obtained on the substrate before coating process and rougher surface is obtained after coating. As a result larger outer electrochemical active surface area (ECSA) is obtained on the anodes with Sandblasting, which was determined based on cyclic voltammetry, whereas the inner ECSA is independent of the pretreatment. The polarization measurements in a quasi-steady state reveal that Sandblasting has slight influence on the catalytic activity. Accelerated lifetime tests were carried out in acidic 0.9 mol L−1 Na2SO4 solution (pH = 2) at a current density of 5 × 107 A cm−2 under galvanostatic conditions. It shows that Sandblasting would shorten the lifetime of the anode due to oxidation of the titanium substrate. This is suggested to be due to the shorter distance between the lowest spot of the outer coating surface and the highest spot of the outer substrate of the anode after applying Sandblasting in titanium substrate pretreatment.
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Sandblasting effect on performance and durability of Ti based IrO2−Ta2O5 anode in acidic solutions
Electrochimica Acta, 2019Co-Authors: Geir Martin Haarberg, Svein Sunde, Frode Seland, Arne Peter Ratvik, Susanne Holmin, John Gustavsson, Åsa Afvander, Erik Zimmerman, Torjus ÅkreAbstract:Abstract The effect of applying Sandblasting during pretreatment while preparing titanium based IrO 2 − Ta 2 O 5 anodes by the conventional method was investigated. It was observed that Sandblasting influences the surface morphology both before and after coating as deeper and smaller etching pits are obtained on the substrate before coating process and rougher surface is obtained after coating. As a result larger outer electrochemical active surface area (ECSA) is obtained on the anodes with Sandblasting, which was determined based on cyclic voltammetry, whereas the inner ECSA is independent of the pretreatment. The polarization measurements in a quasi-steady state reveal that Sandblasting has slight influence on the catalytic activity. Accelerated lifetime tests were carried out in acidic 0.9 mol L−1 Na2SO4 solution (pH = 2) at a current density of 5 × 107 A cm−2 under galvanostatic conditions. It shows that Sandblasting would shorten the lifetime of the anode due to oxidation of the titanium substrate. This is suggested to be due to the shorter distance between the lowest spot of the outer coating surface and the highest spot of the outer substrate of the anode after applying Sandblasting in titanium substrate pretreatment.
Ljubo Marion - One of the best experts on this subject based on the ideXlab platform.
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the effects of dental grinding and Sandblasting on ageing and fatigue behavior of dental zirconia y tzp ceramics
Journal of The European Ceramic Society, 2008Co-Authors: Tomaz Kosmac, Cedomir Oblak, Ljubo MarionAbstract:Abstract This study was designed to evaluate the effects of dental grinding and Sandblasting on the ageing and fatigue behavior of pressureless-sintered biomedical grade Y-TZP ceramic. It was found that upon dental grinding and Sandblasting, the surface of the material was heavily damaged in part plastically deformed, but the amount of transformed monoclinic zirconia was low. The partitioned tetragonal zirconia grains and pre-existing monoclinic zirconia in the ground and sandblasted surfaces hindered the propagation of the diffusion-controlled transformation during subsequent ageing. Dental grinding at a high rotation speed lowered the mean strength under static loading and the survival rate under cyclic loading. Sandblasting, in contrast, resulted in surface strengthening and substantially higher survival rate under cyclic loading. For all tested groups, about 10–15% lower survival-strength values were obtained when tested in artificial saliva, compared to dry specimens, implying that stress-assisted corrosion plays an important role in the fatigue behavior of dental zirconia.
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the effect of surface grinding and Sandblasting on flexural strength and reliability of y tzp zirconia ceramic
Dental Materials, 1999Co-Authors: Tomaz Kosmac, Cedomir Oblak, Peter Jevnikar, Nenad Funduk, Ljubo MarionAbstract:Abstract Objectives: This study was conducted to evaluate the effect of grinding and Sandblasting on the microstructure, biaxial flexural strength and reliability of two yttria stabilized tetragonal zirconia (Y-TZP) ceramics. Methods: Two Y-TZP powders were used to produce fine grained and coarse grained microstructures. Sixty discs from each material were randomly divided into six groups of ten. For each group a different surface treatment was applied: dry grinding, wet grinding, Sandblasting, dry grinding+Sandblasting, Sandblasting+dry grinding and a control group. Biaxial flexural strength was determined and data were analyzed using one-way ANOVA, followed by Tukey's HSD test (p . In addition, Weibull statistics was used to analyze the variability of flexural strength. The relative amount of transformed monoclinic zirconia, corresponding transformed zone depth (TZD) and the mean critical defect size ccr were calculated. Results: There was no difference in mean strength between the as sintered fine and coarse grained Y-TZP. Significant differences (p were found between the control group and ground fine grained material for both wet and dry grinding. Sandblasting significantly increased the strength in fine and coarse grained materials. All surface treatment procedures reduced the Weibull modulus of Y-TZP. For both materials, the highest amount of the monoclinic phase and the largest TZD was found after Sandblasting. Lower amounts of the monoclinic phase were obtained after both grinding procedures, where the highest mean critical defect size ccr was also calculated. Significance: Our results indicate that Sandblasting may provide a powerful technique for strengthening Y-TZP in clinical practice. In contrast, grinding may lead to substantial strength degradation and reduced reliability of prefabricated zirconia elements, therefore, Sandblasting of ground surfaces is suggested.
J P Matinlinna - One of the best experts on this subject based on the ideXlab platform.
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residual contaminations of silicon based glass alumina and aluminum grits on a titanium surface after Sandblasting
Silicon, 2019Co-Authors: Cecilia Yan Guo, J P Matinlinna, James Kithon Tsoi, Alexander Tin Hong TangAbstract:Sandblasting (grit-blasting) is a commonly used surface treatment method for roughening the surface of titanium dental implants. Today, alumina (Al2O3) grits with various sizes are widely used for this purpose, due to their good surface roughening effects. However, Sandblasting with Al2O3 grits also introduces impurities to the surface of the Ti implant, which may adversely affect the osseointegration process of the implant. This raises the question as to the use of Al2O3 as the most suitable type of Sandblasting grit, considering the contaminations to the titanium implant in addition to roughening effects. This study evaluates Al2O3, a silicon-based (silica, SiO2) glass and Al metal grits in terms of both roughing effects and contamination to the titanium implant surface. Thirty commercially pure grade 2 (CP2) titanium plates were grit-blasted using various grits. Surface roughness average (R a) of all grit-blasted plate was measured. In addition, SEM/EDX analysis was performed to detect the morphology and elements on the titanium specimen surface before and after Sandblasting. Results showed that each type of grits has its own advantages and disadvantages. This said, Al2O3 might be the most suitable material among the three tested grit materials for Sandblasting a titanium dental implant surface.
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effects of Sandblasting distance and angles on resin cement bonding to zirconia and titanium
International Journal of Adhesion and Adhesives, 2015Co-Authors: James Kithon Tsoi, Dan Liu, Christie Ying Kei Lung, H M Wong, J P MatinlinnaAbstract:Abstract Objectives The aim of this study was to evaluate effects of Sandblasting distance and angles resin to zirconia and titanium bonding. Methods Densely sintered zirconia and cp2 titanium specimens were prepared and randomly divided into groups, and then sandblasted with various distance (5 mm, 10 mm and 15 mm) and angles (45°, 60°, 75° and 90°). After surface treatment, each specimen surface underwent a silane primer application (RelyX, 3M ESPE), followed by bonding of a resin cement (RelyX Unicem Aplicap, 3M ESPE). Then, each cylindrical resin stub (diameter 3.6 mm×2 mm) underwent a shear adhesive (bond) strength test and surface roughness evaluation. SEM evaluation and EDX analysis were used to observe surface properties of both zirconia and titanium samples. Results were statistically analyzed using analysis of variance (ANOVA) and Turkey test (α=0.05). Results Surface roughness showed a significant difference amongst the different distances and angles for both the zirconia and titanium materials and these changes in surface roughness were evident in the SEM imaging photos. As for the adhesive strength, there was a significant difference in the adhesive strength for the titanium and zirconia with different angles. In general, 75° gives the best results although this is not significantly different from 90°. However, no significant difference was observed in changes of Sandblasting distance for both materials. EDX analysis at the surface revealed elements carbon, oxygen, silicon, aluminum, and zirconia on the surface. Conclusions Sandblasting at various distance and angles contributes differences in surface roughness when it comes to both zirconia and titanium materials. Despite both 75° or 90° Sandblasting angle could yield a sufficiently high adhesive strength for resin to titanium or zirconia bonding, Sandblasting at 75° seems to be optimal to increase the adhesive strength.
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effects of different blasting materials on charge generation and decay on titanium surface after Sandblasting
Journal of The Mechanical Behavior of Biomedical Materials, 2014Co-Authors: Alexander Tin Hong Tang, James Kithon Tsoi, J P MatinlinnaAbstract:Abstract It has been reported that Sandblasting titanium with alumina (Al2O3) powder could generate a negative electric charge on titanium surface. This has been proven to promote osteoblast activities and possibly osseointegration. The purpose of this pilot study was to investigate the effects of different blasting materials, in terms of the grit sizes and electro-negativity, on the generation of a negative charge on the titanium surface. The aim was also to make use of these results to deduct the underlying mechanism of charge generation by Sandblasting. Together 60 c.p. 2 titanium plates were machine-cut and polished for Sandblasting, and divided into 6 groups with 10 plates in each. Every plate in the study groups was sandblasted with one of the following 6 powder materials: 110 µm Al2O3 grits, 50 µm Al2O3 grits, 150–300 µm glass beads, 45–75 µm glass beads, 250 µm Al powder and 44 µm Al powder. The static voltage on the surface of every titanium plate was measured immediately after Sandblasting. The static voltages of the titanium plates were recorded and processed using statistical analysis. The results suggested that only Sandblasting with 45–75 µm glass beads generated a positive charge on titanium, while using all other blasting materials lead to a negative charge. Furthermore, blasting grits of the same powder material but of different sizes might lead to different amount and polarity of the charges. This triboelectric effect is likely to be the main mechanism for charge generation through Sandblasting.
Masahiro Nawa - One of the best experts on this subject based on the ideXlab platform.
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effect of Sandblasting and heat treatment on biaxial flexure strength of the zirconia alumina nanocomposite
Key Engineering Materials, 2007Co-Authors: Seiji Ban, Hideo Sato, Y. Suehiro, Hideo Nakanishi, Masahiro NawaAbstract:The effect of Sandblasting and heat treatment on biaxial flexure strengths of the zirconia/alumina nanocomposite stabilized with cerium oxide (Ce-TZP/Al2O3 nanocomposite) was evaluated in comparison to that of yttria stabilized tetragonal zirconia polycrystals (Y-TZP). The disc-shaped specimens of the nanocomposite and Y-TZP were sandblasted with 70)m alumina powder. After Sandblasting, half of the specimens were heated at 1000°C for 5 min. The biaxial flexure strengths of Y-TZP were independent on the Sandblasting, but decreased with the heat treatment. On the other hand, the biaxial flexure strength of the nanocomposite increased with the Sandblasting and significantly decreased with the heat treatment. The content of monoclinic ZrO2 of Y-TZP and the nanocomposite increased with the Sandblasting pressure and dramatically decreased with the heat treatment. These results suggest that the stress-induced transformation from tetragonal to monoclinic of the nanocomposite occurs more easily than Y-TZP.
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Effect of Sintering Condition, Sandblasting and Heat Treatment on Biaxial Flexure Strength of Zirconia
Key Engineering Materials, 2007Co-Authors: Seiji Ban, Hideo Sato, Y. Suehiro, Hideo Nakanishi, Masahiro NawaAbstract:The effect of sintering condition, Sandblasting and heat treatment on biaxial flexure strengths of the zirconia/ alumina nanocomposite stabilized with cerium oxide (Ce-TZP/Al2O3 nanocomposite, referred to NANOZR) was evaluated in comparison to that of yttria stabilized tetragonal zirconia polycrystals (Y-TZP). The disc-shaped specimens of NANOZR and Y-TZP were cut from the full-sintered or middle-sintered ones. The discs cut from the middle-sintered ones were finally sintered at the same temperature for the full-sintered one. These four kinds of disc were treated in various conditions combined with the Sandblasting, the heat treatment, and the storage. The biaxial flexure strength of both middle- and full-sintered Y-TZP decreased with the autoclaving, whereas those of both NANOZR did not change with it. The monoclinic content of both the materials increased with the Sandblasting and decreased with the heat treatment. Regardless of the sintering condition, the monoclinic content of the Y-TZP dramatically increased with the autoclaving and those of NANOZR remarkably increased with the Sandblasting. Regardless of the different surface roughness, the biaxial flexure strengths of both materials strongly depended on the content of monoclinic ZrO2 on the surface.
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Effect of Grinding, Sandblasting and Heat Treatment on the Phase Transformation of Zirconia Surface
Key Engineering Materials, 2007Co-Authors: Hideo Sato, Seiji Ban, Y. Suehiro, Masahiro Nawa, Hideo NakanishiAbstract:This study was aimed to investigate the effect of grinding, Sandblasting by alumina and SiC, and heat treatment on the phase transformation from tetragonal to monoclinic zirconia on the surface of yttria stabilized tetragonal zirconia (Y-TZP) and zirconia/alumina nanocomposite stabilized with cerium oxide (Ce-TZP/Al2O3 nanocomposite). The monoclinic phase content of both materials increased with the grinding and the Sandblasting, while it decreased with the heat treatment. The monoclinic content sequentially increased with the Sandblasting and decreased with the heat treatment to each specific value. The SiC-Sandblasting produced the larger monoclinic content than alumina-Sandblasting. Furthermore, the content changes of the nanocomposite were larger than Y-TZP.
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Effect of Sandblasting and Heat Treatment on Biaxial Flexure Strength of the Zirconia/Alumina Nanocomposite
Key Engineering Materials, 2007Co-Authors: Seiji Ban, Hideo Sato, Y. Suehiro, Hideo Nakanishi, Masahiro NawaAbstract:The effect of Sandblasting and heat treatment on biaxial flexure strengths of the zirconia/alumina nanocomposite stabilized with cerium oxide (Ce-TZP/Al2O3 nanocomposite) was evaluated in comparison to that of yttria stabilized tetragonal zirconia polycrystals (Y-TZP). The disc-shaped specimens of the nanocomposite and Y-TZP were sandblasted with 70)m alumina powder. After Sandblasting, half of the specimens were heated at 1000°C for 5 min. The biaxial flexure strengths of Y-TZP were independent on the Sandblasting, but decreased with the heat treatment. On the other hand, the biaxial flexure strength of the nanocomposite increased with the Sandblasting and significantly decreased with the heat treatment. The content of monoclinic ZrO2 of Y-TZP and the nanocomposite increased with the Sandblasting pressure and dramatically decreased with the heat treatment. These results suggest that the stress-induced transformation from tetragonal to monoclinic of the nanocomposite occurs more easily than Y-TZP.
