Special features of manufacturing cutting inserts from nanocomposite material Al<sub>2</sub>O<sub>3</sub>-SiC

Gevorkyan, É. S.; Mamalis, A.G.; Вовк, Р. В.; Semiatkowski, Z.; Morozow, Dmitrij; Nerubatskyi, Volodymyr; Морозова, Оксана

doi:10.1088/1748-0221/16/10/p10015

Cited by 17 publications

(5 citation statements)

References 21 publications

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“…The effect of the phase content and morphology of initial powder particles has been considered by researchers, too [ 19 , 20 ]. In the paper [ 21 ], it is reported that a fine-grain matrix was formed due to the dissociation of zircon and silica reactions, as well as bonding of the finer fractions of alumina and mullite powders, and the products of zircon dissociation, where a liquid phase is most likely involved.…”

Section: Introductionmentioning

confidence: 99%

Peculiarities of the Phase Formation during Electroconsolidation of Al2O3–SiO2–ZrO2 Powders Mixtures

et al. 2022

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This paper is devoted to the sintering process of Al2O3–SiO2–ZrO2 ceramics. The studied method was electroconsolidation with directly applied electric current. This method provides substantial improvements to the mechanical properties of the sintered samples compared to the traditional sintering in the air. The research covered elemental and phase analysis of the samples, which revealed phase transition of high-alumina solid solutions into mullite and corundum. Zirconia was represented mainly by tetragonal phase, but monoclinic phase was present, too. Electroconsolidation enabled samples to reach a density of 3.0 g/cm3 at 1300 °С, while the sample prepared by traditional sintering method obtained it only at 1700 °С. For the composite Al2O3—20 wt.% SiO2—10 wt.% ZrO2 fabricated by electroconsolidation, it was demonstrated that fracture toughness was higher by 20–30%, and hardness was higher by 15–20% compared to that of samples sintered traditionally. Similarly, the samples fabricated by electroconsolidation exhibited elastic modulus E higher by 15–20%. The hypothesis was proposed that the difference in mechanical and physical properties could be attributed to the peculiarities of phase formation processes during electroconsolidation.

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Section: Introductionmentioning

confidence: 99%

Peculiarities of the Phase Formation during Electroconsolidation of Al2O3–SiO2–ZrO2 Powders Mixtures

et al. 2022

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“…Керамика Al 2 O 3 −SiC широко используется в промышленности в качестве износостойких пар трения, режущего инструмента, элементов керамической защиты и др. [1][2][3]. Частицы SiC позволяют повысить механические свойства оксида алюминия за счет торможения миграции границ зерен и формирования сжимающих внутренних полей напряжений, изменяющих характер разрушения керамики [4][5][6][7][8][9].…”

Section: Introductionunclassified

Высокоскоростное электроимпульсное плазменное спекание мелкозернистых керамик Al-=SUB=-2-=/SUB=-O_3-SiC. Исследование микроструктуры и механических свойств

Болдин¹,

Попов²,

Мурашов³

et al. 2022

Журнал Технической Физики

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The features of spark plasma sintering of submicron Al2O3 powders with different contents (0, 0.5, 1.5, 5 vol.%) of -SiC nanoparticles have been studied. The microstructure and hardness of Al2O3 + 5 vol.% SiC ceramics obtained by sintering Al2O3 powders with -SiC particles of various types (nanoparticles, submicron particles, fibers) have been studied. Sintering was carried out at heating rates (Vh) from 10 to 700 °C/min. The sintering process of Al2O3 + SiC ceramics with low heating rates (Vh = 10–50 °C/min) has a complex three-stage character, with a flat area in the temperature range of 1200–1300 °C. At high heating rates (Vh > 250 °C /min), the usual three-stage character of sintering is observed. The analysis of temperature dependences of compaction was carried out using the Young-Cutler model; It was found that the kinetics of powder sintering is limited by the intensity of grain boundary diffusion. It is shown that the dependence of the hardness of Al2O3 + SiC ceramics on Vh has a nonmonotonic character, with a maximum. In the case of pure alumina, an increase in Vh leads to a monotonic decrease in hardness.

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“…Alumina-based ceramics are popular materials for cutting tools due to their good wear resistance, high hardness, heat resistance and chemical stability [ 2 ]. There are many reports on the effects of various reinforcements, such as graphene [ 3 ], SiC [ 4 , 5 ], SiC w -Si 3 N 4 [ 6 ], TiC [ 7 ], TiC-TiN [ 8 ] and WC [ 9 ], and the works on property improvement are still going on. Basically, sintering methods are used for the fabrication of ceramic matrix composites [ 10 , 11 , 12 ].…”

Section: Introductionmentioning

confidence: 99%

Activated Sintering of Cr2O3-Based Composites by Hot Pressing

et al. 2022

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The paper presents and discusses questions on structure formation during the sintering process of Cr2O3-based composites using the hot pressing method, when a chemical reaction between the components takes place. The task was difficult because Cr2O3 decomposes when sintered at temperatures above 1300 °C. The proposed novel method allowed for interaction between aluminum and chromia, thus avoiding the decomposition of the latter. Here, ultrafine aluminum powder played the role of the active agent forming a liquid phase and reacting with Cr2O3. The appearance of the solid solutions of (Cr,Al)2O3 with different stoichiometry of Cr and Al depended on the aluminum content in the initial mixture. The solid solution significantly strengthened boundaries between composite phases, resulting in the composite material of high fracture toughness between 5 and 7 MPa m½ and bending strength of ca. 500 MPa. The best mechanical properties exhibited the cermet with 22 wt.% of the restored chromium.

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Special features of manufacturing cutting inserts from nanocomposite material Al₂O₃-SiC

Cited by 17 publications

References 21 publications

Peculiarities of the Phase Formation during Electroconsolidation of Al2O3–SiO2–ZrO2 Powders Mixtures

Peculiarities of the Phase Formation during Electroconsolidation of Al2O3–SiO2–ZrO2 Powders Mixtures

Высокоскоростное электроимпульсное плазменное спекание мелкозернистых керамик Al-=SUB=-2-=/SUB=-O_3-SiC. Исследование микроструктуры и механических свойств

Activated Sintering of Cr2O3-Based Composites by Hot Pressing

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Special features of manufacturing cutting inserts from nanocomposite material Al2O3-SiC

Cited by 17 publications

References 21 publications

Peculiarities of the Phase Formation during Electroconsolidation of Al2O3–SiO2–ZrO2 Powders Mixtures

Peculiarities of the Phase Formation during Electroconsolidation of Al2O3–SiO2–ZrO2 Powders Mixtures

Высокоскоростное электроимпульсное плазменное спекание мелкозернистых керамик Al-=SUB=-2-=/SUB=-O_3-SiC. Исследование микроструктуры и механических свойств

Activated Sintering of Cr2O3-Based Composites by Hot Pressing

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Special features of manufacturing cutting inserts from nanocomposite material Al₂O₃-SiC