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Alumina - Springer Nature

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Last Updated: 03 June 2022

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Study of CCLW, Alumina and the Mixture of Alumina- and CCLW-Reinforced Aluminum-Based Composite Material with and Without Mechanical Alloying

For 100 h, the average alumina content and ball-milled collagen was reduced from 3. 725 g / cm3 to 3. 68 g / cm3. As the mixture of alumina contents and without ball-milled collagen powder was encapsulated in the aluminum alloy, the Agglomeration of collagen powder was discovered. After heat treatment, alumina, aluminum/alumina, Al/collagen powder/alumina, aluminum/alumina, Al/collagen powder/alumina, aluminum/alumina, Al/collagen powder/alumina, aluminum/alumina, Al/collagen powder/alumina, Al/collagen powder/alumina, aluminum/alumina, Al/collagen powder/alumina, aluminum/alumina, Al/collagen powder/alumina, aluminum/alumina, aluminum alloy, alumina, alloy, alumina addition effect in aluminum/alumina, Al/alumina, aluminum/alumina, Al/alumina, aluminum/alumina, Al/alumina, aluminum/alumina, Al/alumina, aluminum/alumina, Al/alumina, Al/a.

Source link: https://doi.org/10.1007/s40033-021-00312-y


Tribology Characterization of Plasma Sprayed Zirconia-Alumina and Fused Zirconia-Alumina Composite Coated Al-Si Alloy at Different Sliding Velocity and Load Conditions

"To the best of the information, there is a lack of literature relating to the comparative study of partially stabilized Zirconia-Alumina composite and fused zirconia-Alumina coating's frictional-wear behavior. " Hence, the present article seeks to investigate the frictional-wear behavior of PSZAC and FZAC coatings on Aluminium-Silicon alloy engineered using the atmospheric plasma-spray technique. When compared to the Al-Si surface under all dry sliding conditions, the wear resistance of the dual ceramic coatings has increased. Friction coating's wear rate and Coefficient of Friction are down by 1. 2 percent in comparison to ZAC coating due to the increased surface hardness and solid lubricant tribo effect, as well as the solid lubricant tribo effect. ".

Source link: https://doi.org/10.1007/s12633-021-01234-w


Alumina as a Computed Tomography Soft Material and Tissue Fiducial Marker

"Methods u03bcCT imaging was performed on a soft-tissue organ, in this case heart valve tissue tissue, using markers from eight different materials included. " In addition, we evaluated the same markers with DiceCT stained tissue in a fluid medium. Conclusions Both of the metallic markers produced important artifacts and were found to be unsuitable for soft-tissue u03bcCT imaging, while alumina markers were the best, with excellent contrast and consistency. Conclusions These results support the continued use of alumina as fiducial markers for soft matter and tissue research that use CT and u03bcCT imaging. ".

Source link: https://doi.org/10.1007/s11340-022-00825-x


Metal–organic framework on porous TiO_2 thin film-coated alumina beads for fractional distillation of plant essential oils

"Activated alumina beads were coated with a porous TiO_2 thin film. " In resultant porous surfaces, growth of Cu-BTC crystals contributes to the growth of new nanopores and increased metal centers for different coordination with various components of essential oils. The TiO_2 thin film is not only an integral part of the composites but also promotes the growth of Cu-BTC metal oxide crystals in a specific way by coordinative interactions. These Al_2O_3@TiO_2@Cu-BTC MOF beads have excellent absorptive capabilities for key essential oils, except for a single cyclic ether eucalyptol with steric hindrances. ".

Source link: https://doi.org/10.1007/s00216-022-04103-6


Effect of Physicochemical Properties of Slag on the Removal Rate of Alumina Inclusions in the Ruhrstahl–Heraeus (RH) Refining Conditions

"The effect of physicochemical properties of iron-bearing calcium aluminate slag on the removal rate of alumina inclusions in Al-killed steel melts has been investigated by considering the interfacial reaction of steel melts and the slag layer at high temperatures. As soon as the Fe3Al alloy is added to the steel melts, the total oxygen content in the steel decreases. As the slag's viscosity increases, the apparent rate constant of oxygen removal reaction rises with increasing amounts of iron oxide and CaO/Al_2O_3 ratio. However, the apparent rate constant of oxygen removal reaction in slag is not strictly proportional to the slag's physicochemical characteristics, because the oxygen is continually transferred from slag to bulk steel melts due to the reoxidative interfacial reaction between steel and slag melts.

Source link: https://doi.org/10.1007/s11663-022-02548-9


Experimental investigation on sucrose/alumina catalyst coated converter in gasoline engine exhaust gas

"In this research, a modified catalytic converter was used to remove the harmful exhaust gas pollutants from a twin-cylinder, four-stroke spark-ignition engine," the author says. Over the metallic substrate inside the catalytic converter, a sucrolite catalyst was coated, and exhaust gas was allowed to flow through it. The results were compared to those of a commercial catalytic converter, and catalytic reactions were investigated by altering the engine loads and bed temperatures, and the results were similar to those of a commercial catalytic converter. The findings show that sucrose present in the catalyst was suitable at low temperatures, while alumina was suitable for a variety of temperatures. The maximum catalytic conversion efficiencies achieved for oxidizing CO and HC were 70. 3 percent and 85. 1 percent, respectively, in the case of the refurbished catalytic converter, and reduction reaction at NO_x was 62%, which is around 42% higher than in the commercial catalytic converter. As a result, this report shows that the sucrolite catalyst is safe for low-temperature exhaust gas. ".

Source link: https://doi.org/10.1007/s11356-022-20655-7


Preparation of a dense alumina fiber with nanograins by a novel two-step calcination

"Controlling the density and the nanograin size is daunting, but it is also essential to produce continuous alumina fibers with high quality. " Continuous alumina fibers were made using the sol-gel method in this research. The effect of calcining conditions on fiber microstructure evolution was shown by fiber microstructure evolution. The transformation from amorphous Al_3O_3 to u03b3-Al_3O_3 begins at b3O_3 and then to u03b1-Al_2O_3 occurs during the calculation process, as shown by the results. Fibers were rated at 2. 2 GPa when a novel two-step calcining process was introduced, resulting in the production of a nearly solid u03b1-Al_3O_3 fiber with an average grain size of 152 nm. Graphical abstract The full alumina fiber with nanograins were created using a new two-step calcination method. "Alumina fibers' tensile strength reaches up to 2. 2 GPa. ".

Source link: https://doi.org/10.1007/s10971-022-05813-0


Alumina–di water-based nanofluid process parameter optimization for stability

"The process parameters investigated for improving nanofluid's stability include nanoparticle concentration, nanoparticle size, surfactant concentration, stirring time, and sonication time. " Using a two-step process of nanofluid preparation, the Taguchi device is used to identify and prepare the eighteen samples of nanofluid with various parameter settings. With a delta value of 2. 46, the signal-to-noise ratio revealed that the nanoparticle concentration in a base fluid was the most affecting parameter. The results of ANOVA reveal that the nanofluid concentration in base fluid confers the most significant effect on nanofluid stability with a percentage of 67. 6 percent, followed by nanoparticle size with a contribution of 9. 11%, and sonication time with a value of 9. 8 percent, although initial stirring time has not been statistically significant as its p -value exceeded 0. 5 percent.

Source link: https://doi.org/10.1007/s40430-022-03541-8

* Please keep in mind that all text is summarized by machine, we do not bear any responsibility, and you should always check original source before taking any actions

* Please keep in mind that all text is summarized by machine, we do not bear any responsibility, and you should always check original source before taking any actions