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Alumina - Springer Nature

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Last Updated: 03 December 2022

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Effect of Nano Alumina Reinforcements on the Tribological Behavior of Electroless Nickel-Phosphorus Coatings

In the present research, an attempt was made to investigate the tribological properties of Nickel-Phosphorus coatings reinforced with nano alumina powders. The investigation includes the incorporation of 1 g/l of nano alumina power into the Nickel-Phosphorus coatings. It was ultrasonicated in a wet media prior to the introduction of the alumina powder into the coating bath. Besides this, the present study also compares the coating with respect to their scratch hardness and micro-Vicker hardness. This work also includes a characterization of the as-deposited reinforced coating surface by X-ray diffractometry and Scanning electron microscopy.

Source link: https://doi.org/10.1007/978-981-19-3266-3_17


Machining Characteristics Study of Ti-Al_2O_3 (20 Vol.% of Ti Added as Alumina Fiber into Titanium Matrix) Composite Material While Undergoing WEDM Operation

Present research has been launched in this context with the intention of producing new metal matrix composite material. Ti-Al_2O_3 is manufactured in the present research by adding 20 volume percentage of Titanium as Alumina fiber reinforced into the Titanium matrix to produce this type of new Titanium matrix composite material. With the support of Box-Behnken Design of RSM optimization, the machining characteristics of Ti-Al_3 composite material are investigated by undergoing Wire Cut Electric Discharge Machining operation. In the new research work for the sintered Ti-Al_2O_3 material, the effect of the various process parameters on the output responses is investigated. The objective is to validate the actual findings, which have been found to be acceptable in the present research study.

Source link: https://doi.org/10.1007/978-981-19-0561-2_17


Experimental and Computational Wear Studies of Alumina and Zirconia Versus SS316L for Hip Prosthesis

Hip implants are commonly used in surgeries to repair hip fracture. Hip bones wear at the joint section due to aging and inappropriate layout, so hip implants must maintain their original hip joint components design for a long time. The hip implant materials must be biocompactible and have good mechanical stability. As ball, this research involves experimental wear testing of SS316L and ceramic materials as a ball. The test conditions considered are various sliding velocities and loads, as well as the appropriate coefficient of friction and wear coefficients. The linear and volumetric wear of a Finite element model using ANSYS on the head and cup of hip implant are calculated. Only for a total of 5 million cycles to predict 5 years of life are used in this report. Both tests' findings are compared to determine the best materials for hip implants.

Source link: https://doi.org/10.1007/978-981-19-4147-4_25


Kaolin: An Alternate Resource of Alumina

Both countries get alumina by importing either bauxite or direct alumina, but in both cases, they're spending a lot on transportation and fuel. This research discusses the exact investigation of alumina extraction from Kaolin using various techniques, including acid treatment of original Kaolin with and without thermal treatment. The metal liberation of thermally treated Kaolin was much higher than that of the previous one. The leaching aluminium was returned to pH 12. 0 directly where the precipitated iron oxide precipitated as sodium aluminate leaving precipitated iron oxide as a solid part that was filtrated and separated as sodium aluminate leaving precipitated iron oxide as a solid part.

Source link: https://doi.org/10.1007/978-981-19-7264-5_10


Experimental Investigation on Use of Activated Alumina and Molecular Sieve 13× In Heatless Desiccant Air Dryer

Dry compressed air is particularly useful in several applications such as power tools, such as air hammer, drills, wrenches, pneumatic machine designs, pneumatic machine designs, painting, coating, moulding, and sandblasting, etc. Hence, moisture removal from compressed air is highly desired. In the heatless air dryer built for ten CFM capacity, this paper experimentally investigates the use of solid desiccants, activated alumina, and molecular sieve 13u00d7. A homogeneous mixture of both the desiccants is also tested in one of the trials, and dew points are then compared.

Source link: https://doi.org/10.1007/978-981-19-3379-0_9


Broadband Multi-layer Anti-reflection Coatings with Mullite and Duroid for Half-wave Plates and Alumina Filters for CMB Polarimetry

For use on a sapphire half-wave plate and an alumina infrared filter for cosmic microwave background polarimetry, a broadband two-layer antireflection coating was designed. Measuring tiny CMB B-mode signals requires increasing the number of photons hitting the detectors and minimizing spurious polarization due to reflection of an off-axis incident angle. However, a sapphire HWP and an alumina IR filter have high refractive indices of 2̆243 3. 2, and an AR coating must be applied to them. In terms of index and coefficient of thermal expansion for use at cryogenic temperatures, thermally sprayed mullite and Duroid 5880LZ were selected.

Source link: https://doi.org/10.1007/s10909-022-02847-0


Preparation and characterization of Al_2O_3-SiC-C castables using ferrotitanium slag: structural commonalities between titanium–alumina slag and calcium alumino-titanate

In this research, low-cost ASC castables were made using TAS and compared to those that were not prepared using CAT in different environments. When fired in air, metallic inclusions and Ti-concentrated areas in TAS aggregates lead to reduced cold mechanical strength in TAS-based castables. Both CAT and TAS revealed the underlying causes of aggregate damage along the boundary of the main crystal phase following heat treatment in an oxidizing atmosphere.

Source link: https://doi.org/10.1007/s41779-022-00742-1


New technology and application development of alkoxide-derived high purity alumina

We have developed mass-production technology that utilizes hydrolysis of aluminum alkoxide, among many manufacturing techniques for high purity alumina. We've developed nano-sized u03b1-alumina with round and uniform particle shape with tight particle size distribution in order to obtain these properties. The aluminum alkoxide hydrolysis process has created a process for mass-producing high purity alumina. Fine alumina can produce dense sintered bodies for a variety of applications, such as semiconductor manufacturing.

Source link: https://doi.org/10.1007/s10971-022-05851-8


Thermal, optical and temperature-dependent electrical properties of poly(aniline-co-pyrrole)/copper alumina nanocomposites for optoelectronic devices

The paper discusses the investigation of structural, thermal, and temperature-dependent alternating current parameters of hetero-structures formed by the reinforcement of copper alumina nanoparticles within the poly. The ultraviolet spectrum of /Cu_2O_3 nanocomposites revealed a red shift in absorbance and the least optical bandgap energy for 5 mass percentage nanocomposite was observed in comparison to the pristine copolymer. A delayed thermal degradation for copolymer nanocomposites was revealed by thermogravimetric testing. A swift rise and an incomplete semicircle were visible in two distinct locations, as shown by the Nyquist plot of copolymer nanocomposites in two distinct regions, an incomplete semicircle and a rapid rise. Due to the increased number of charge carriers growing within the nanocomposites, the DC conductivity of nanocomposites was enhanced with the reinforcement of Cu-u2013Al_2O_3 nanofillers. The McCullough model was in good agreement with measured DC conductivity as this model shows the connection of DC conductivity dependence on the number of filler and conductive pathway between the interfaces, which was also shown by measurements.

Source link: https://doi.org/10.1007/s10973-022-11670-4


Integration of ANN and NSGA-II for Optimization of Nusselt Number and Pressure Drop in a Coiled Heat Exchanger via Water-Based Nanofluid Containing Alumina and Ag Nanoparticles

Considered in this research were both minimizing the pressure drop and increasing the Nusselt number of water-based nanofluids containing alumina and Ag in a coiled heat exchanger. As a result of nanoparticle volume fraction and Reynolds number, the artificial neural network has been used to predict nanofluidu2019s pressure decline and Nusselt number. The optimum pressure drop as well as Nusselt number are determined by nanoparticle volume fraction and Reynolds number, as a result of nanoparticles volume fraction and Reynolds number. The obtained correlations using ANN are used as input into the NSGA-II optimization algorithm to obtain the optimal pressure drop as well as Nusselt number as a function of nanoparticles volume fraction and Reynolds number.

Source link: https://doi.org/10.1007/s13369-022-07480-3

* 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