Crucial effect of SiC particles on in situ synthesized mullite whisker reinforced Al2O3-SiC composite during microwave sintering

Dang, Xudan; Wei, Meng; Zhang, Rui; Guan, Keke; Fan, Bingbing; Long, Weimin; Ma, Jun; Zhang, Hongsong

doi:10.2298/pac1702106d

Cited by 7 publications

(5 citation statements)

References 27 publications

(36 reference statements)

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“…SiC phase was still detectable in the samples after crack-healing because SiC particles on the surface and cracks are only exposed to air and get oxidized into SiO 2 and the SiC particles within the surfaces are not getting oxidized. In previous studies, it was also observed that a SiO 2 phase forms in all four traditional sintering compositions, but only a small amount of SiO 2 forms in 15 and 20 wt.% of SiC composites synthesized by microwave sintering due to the shorter sintering time [19,20] Advances in Materials Science and Engineering crack-healing are shown in Figure 5. After crack-healing heat treatment at 1200°C for 1h in air, the surface of specimen became rough due to the oxidization of the particles.…”

Section: Phase Variation Aftermentioning

confidence: 85%

“…Microwave sintering is viewed as a prevailing method than conventional sintering processes because it can provide enhanced mechanical properties and better finer microstructure with minimum energy consumption [12,13]. Microwave sintering has been successfully used to synthesize Al 2 O 3 -based structural ceramics with constructive mechanical properties [14][15][16][17][18][19][20][21][22]. In order to produce crackhealing in Al 2 O 3 /SiC structural ceramic composites, the presence of SiC phase after sintering process was very much needed.…”

Section: Introductionmentioning

confidence: 99%

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[Retracted] A Comparative Study on Crack‐Healing Ability of Al2O3/SiC Structural Ceramic Composites Synthesized by Microwave Sintering and Conventional Electrical Sintering

Mohankumar

Shankar

Karthik

et al. 2021

Advances in Materials Science and Engineering

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This study was conducted to assess and compare the crack-healing ability of conventional electrical sintered and microwave sintered Al2O3/x wt. % SiC (x = 5, 10, 15, and 20) structural ceramic composites. The crack-healing ability of both conventional electrical sintered and microwave sintered specimens was studied by introducing a crack of ∼100 µm length by Vickers’s indentation and conducting a heat treatment at 1200°C for dwell time of 1 h in air. The flexural or bending strength of sintered, cracked, and crack-healed specimens was determined by three-point bending test, and the phase variations by X-ray diffraction and SEM micrographs before and after crack-healing of both the sintering methods were studied and compared. The results show that almost all the specimens recovered their strength after crack-healing, but the strength of microwave sintered Al2O3/SiC structural ceramic composites has been shown to be better than that of conventional electrical sintered Al2O3/SiC structural ceramic composites. The microwave sintered crack-healed Al2O3/10 wt. % SiC specimen shows higher flexural strength of 794 MPa, which was 105% when compared with conventional electrical sintered Al2O3/10 wt. % SiC and crack-healed Al2O3/10 wt. % SiC specimen. It was found by X-ray diffractogram that before crack-healing, all the conventional electrical sintered samples have SiO2 phase which reduce the crack-healing ability and microwave sintered samples with 15 and 20 wt. % SiC show lesser SiO2 phase and 5 and 10 wt. % SiC samples have no SiO2 phase before crack-healing. However, after crack-healing treatment, all the samples have distinct SiO2 phase along with Al2O3 and SiC phases. Microwave sintered Al2O3/10 wt. % SiC specimen cracks were fully healed which was evident in SEM micrographs.

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Section: Phase Variation Aftermentioning

confidence: 85%

Section: Introductionmentioning

confidence: 99%

[Retracted] A Comparative Study on Crack‐Healing Ability of Al2O3/SiC Structural Ceramic Composites Synthesized by Microwave Sintering and Conventional Electrical Sintering

Mohankumar

Shankar

Karthik

et al. 2021

Advances in Materials Science and Engineering

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“…In the present investigation, the SiC/Al 2 O 3 composites reinforced by in situ mullite were prepared. In the previous research, the optimum sintering temperature, holding time, volume fraction of SiC particles, and volume fraction of Al 2 O 3 particles about the mullite reinforced SiC/Al 2 O 3 composites were 1500 °C, 30 min, 50%, and 50%, respectively [14]. erefore, the above sintering parameters were also used here.…”

Section: Introductionmentioning

confidence: 99%

“…Not only the morphology of the reinforcing phase but also the chemical compatibility and thermal expansion match of the reinforcing phase and matrix could influence the preparation process and final properties of SiC/ Al 2 O 3 composites. e recent research showed that particles and whiskers can greatly improve the strength and toughness of the ceramic matrix composites [13][14][15][16]. For whisker reinforced composites, the improvement is due to the changes of the microstructure, interface strengthening, and fracture mechanisms.…”

Section: Introductionmentioning

confidence: 99%

Mullite Reinforced SiC/Al2O3 Composites Prepared by Microwave Sintering Based on Green Manufacturing

Dang

Shi

et al. 2022

Mathematical Problems in Engineering

Self Cite

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In the preparation process of composites, the implementation of green manufacturing technology has an important impact on improving material properties and preparation efficiency. The adopting of green manufacturing technology not only greatly reduces the energy consumption but also effectively avoids the environmental pollution. Compared with the traditional material preparation process, the material preparation process for green manufacturing is a new concept and idea. Microwave sintering is such an efficient, clean, and pollution-free preparation process, so it is widely used in the field of material preparation. By microwave sintering, the mullite reinforced SiC/Al2O3 composites with different SiC particle size were prepared from the composite powders composed of SiC particles coated with SiO2, by a sol-gel method and Al2O3 particles. The effect of SiC particle size on the microstructure, bulk density, fracture toughness, flexural strength, and thermal shock resistance of SiC/Al2O3 composites was studied. The bulk density, fracture toughness, and flexural strength were evaluated by the Archimedes method, single-side notched beam method, and three-point bending method, respectively. The thermal shock resistance of samples was investigated through the combination of water quenching and three-point bending methods. The results showed that with the increase of SiC particle size, the bulk density, fracture toughness, and flexural strength of samples all increased first and then decreased. The bulk density, fracture toughness, flexural strength, and flexural strength retention of SiC(5 μm)/Al2O3 composites were better than those of other samples, which were 2.06 g/cm3, 1.98 MPa·m1/2, 63 MPa, and 60%, respectively. The better mechanical properties and thermal shock resistance of SiC(5 μm)/Al2O3 composites are due to the formation of bridging mullite whiskers between SiC and Al2O3 particles with large length diameter ratio. Therefore, the unique sintering mechanisms of size coupling effect and local thermal aggregation effect in microwave sintering were discussed. The research results can not only provide reference for the preparation process of mullite reinforced SiC/Al2O3 composites but also for the wide application of microwave sintering technology.

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“…In the case of insufficient mechanical properties and oxidation resistance of a single phase ceramics, com-posite ceramics can be prepared by adding additives such as SiC, MoSi 2 , ZrN and BN to improve relevant properties [8][9][10][11][12]. Previous studies have proven that the addition of SiC can effectively improve mechanical properties and oxidation resistance of AlON ceramics [13,14].…”

Section: Introductionmentioning

confidence: 99%

Oxidation resistance performance of SiC-AlON ceramic composites at high temperature

Xiao

Zhao

et al. 2022

PAC

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The microstructure and oxidation behaviour of the pure AlON ceramics and 8 wt.% SiC-AlON composite were investigated at 700-1500?C. With increasing oxidation temperature, the surface morphology of two ceramics showed a change from acicular to flaky-like and then to granular features. With the addition of nanosized SiC particles, the oxidation resistance of the ceramics was remarkably enhanced above 1100?C. This is attributed to the formation of a dense oxide layer composed of Al2O3, SiO2 and mullite, which could cover the whole matrix and suppress further penetration of oxygen. Due to the dense oxide layer, the oxidation kinetics of the 8 wt.% SiC-AlON composites conformed to a parabolic law, while that of the pure AlON conformed to a linear law. After oxidation at 1500 ?C for 40 h, the weight gain of the 8 wt.% SiC-AlON composites was 3.07mg/cm2, which was only 22.5% of that of the pure AlON.

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Crucial effect of SiC particles on in situ synthesized mullite whisker reinforced Al2O3-SiC composite during microwave sintering

Cited by 7 publications

References 27 publications

[Retracted] A Comparative Study on Crack‐Healing Ability of Al2O3/SiC Structural Ceramic Composites Synthesized by Microwave Sintering and Conventional Electrical Sintering

[Retracted] A Comparative Study on Crack‐Healing Ability of Al2O3/SiC Structural Ceramic Composites Synthesized by Microwave Sintering and Conventional Electrical Sintering

Mullite Reinforced SiC/Al2O3 Composites Prepared by Microwave Sintering Based on Green Manufacturing

Oxidation resistance performance of SiC-AlON ceramic composites at high temperature

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