Structure formation and properties of corundum ceramics based on metastable aluminium oxide doped with stabilized zirconium dioxide

Maletsky, A.V.; Belichko, D.R.; Konstantinova, Tetyana; Волкова, Г. К.; Doroshkevich, Aleksandr; Lyubchyk, Andriy; Burkhovetskiy, V.V.; Aleksandrov, Vitaliy A.; Mardare, Diana; Mîţă, Carmen; Chicea, Dan; Khiem, L. H.

doi:10.1016/j.ceramint.2021.03.286

Cited by 13 publications

(3 citation statements)

References 8 publications

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“…At the same time, the arm is provided with load sensors, and the friction is measured in simulated conditions of the grinding process created by applying a normal load on the arm to maintain contact between the lower and upper millstone samples. It is worth noting that the material used for the millstones can be either granite or ceramic, and in this paper, ceramic was chosen as the best naturally transparent material (a rock-forming mineral primarily composed of aluminum oxide, Al 2 O 3 , in the crystalline form with traces of iron, titanium, vanadium, and chromium) [27][28][29][30]. Therefore, the samples to be tested were made of the same material as the millstones, which was corundum ceramic, with an average surface roughness of 0.258 µm).…”

Section: Methodsmentioning

confidence: 99%

“…Processes 2023, 11, x FOR PEER REVIEW 6 of 14 ceramic was chosen as the best naturally transparent material (a rock-forming mineral primarily composed of aluminum oxide, Al2O3, in the crystalline form with traces of iron, titanium, vanadium, and chromium) [27][28][29][30]. Therefore, the samples to be tested were made of the same material as the millstones, which was corundum ceramic, with an average surface roughness of 0.258 µm).…”

Section: Friction Modelingmentioning

confidence: 99%

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Study of the Grinding Process by Friction of Cereal Grains in Stone Mills

Ilie,

Cotici,

Hristache

2023

Processes

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The grinding process via friction at the micro-scale in a mill with stones is considered a variable combination of contacts, with two-body (the asperities of lower millstone in direct contact with the asperities of upper millstone) and three-body (micro-particles of ground seeds trapped between the asperities of lower and upper stones of the mill) contacts. Three elements are described: (1) the mechanical contact of the asperities of the lower and upper millstones to predict pressures on asperities by modeling; (2) tests on a millstone sample covered with grinding particles; and (3) tests on a wafer sample formed by the millstones with the grinding particles between them. This paper highlights the combined effects of the micro-scale friction via individual measurements, using an analytical model to sum these effects and validating the model by performing several experiments. An efficiency grind by friction assumes the grain’s movement and interaction between the seeds and solid surfaces, and is highlighted through theoretical and experimental studies. Topography analysis of the surface of the millstones reveals the model of microscopic frictional force. Endpoint measurements (the traces of the surface topography evolution) enable model verification in the grinding process. Thus, the results obtained in the grinding process in the stone mills via friction have practical utility through research benefits. Therefore, they allow for the improvement of quality, reliability, flexible grinding, quality control of the flours, and uniformity degree (fineness/shredding).

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Section: Methodsmentioning

confidence: 99%

Section: Friction Modelingmentioning

confidence: 99%

Study of the Grinding Process by Friction of Cereal Grains in Stone Mills

Ilie,

Cotici,

Hristache

2023

Processes

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“…The medical field also uses it as a material for making dental implants. This is due to its properties of high strength, hardness, wear resistance, refractory resistance, thermal conductivity, chemical resistance and electrical strength [4]. Generally, alumina is found in a crystalline form called corundum or α-aluminum oxide.…”

Section: Introductionmentioning

confidence: 99%

An Efficient Extraction and Selective of Alumina from Lapindo Mud

Anggoro,

David,

Alrasyid

et al. 2024

E3S Web Conf.

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Lapindo mud, a soft clay soil found in Sidoarjo, East Java, has a high water and mineral content. It contains 16% alumina (Al2O3), making it a potential source of aluminum metal. The high content of silica oxide in Lapindo mud is of particular interest to separate the oxide from the alumina oxide. Silica oxide is insoluble in acid while aluminum oxide is soluble in acid. The alumina extraction process was carried out using acid solvent. The dried mud with a size of ≤100 mesh was extracted using HNO3 and HCl solvent with concentration of 4, 6, and 8 M at temperatures of 60℃, 70℃, and 80℃ for 100, 200, and 300 minutes. The extraction results were filtered, then the pH of the filtrate was adjusted to 12 with 6 M NaOH. The filtrate was filtered, thus Fe3+ was obtained as a residue. The filtrate was neutralized to pH 8 using 6 M HCl. The filtrate was filtered to obtain NaAlO2. The precipitate formed was washed using distilled water and dried in an oven to obtain Al(OH)3. Al(OH)3 was then calcined at 600℃ for four hours to form Al2O3. The results showed that acid solvent concentration, extraction temperature, and heating time affected the mass of Al2O3 obtained. Increasing acid solvent concentration, extraction temperature, and heating time, increases the mass of Al2O3 obtained. The mass of Al2O3 obtained was 1.19 grams for HNO3 solvent and 1.63 grams for HCl solvent with concentration of 8 M, extraction temperature of 80℃, and heating time of 300 minutes. The results of XRF characterization show that the Al3O3 purity level is 42.8% and 27.3%with HNO3 and HCl solvent, respectively.

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The microstructures and properties of Fe2O3 and TiO2 co-doped corundum ceramics for solar thermal absorbing materials

Liu

et al. 2023

Ceramics International

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Structure formation and properties of corundum ceramics based on metastable aluminium oxide doped with stabilized zirconium dioxide

Cited by 13 publications

References 8 publications

Study of the Grinding Process by Friction of Cereal Grains in Stone Mills

Study of the Grinding Process by Friction of Cereal Grains in Stone Mills

An Efficient Extraction and Selective of Alumina from Lapindo Mud

The microstructures and properties of Fe2O3 and TiO2 co-doped corundum ceramics for solar thermal absorbing materials

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