Preparation of mullite whiskers and their enhancement effect on ceramic matrix composites

Zhang, Jinhua; Wu, Hongdan; Zhang, Suxin; Yu, Jishun; Hou, Shuen

doi:10.1007/s11595-013-0715-4

Cited by 18 publications

(11 citation statements)

References 12 publications

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“…With further increase of SiC particle size, the mullite whisker can also be found in the sample Al 2 O 3 -SiC-50, but the length-to-diameter ratio of mullite whisker is relatively small [26] and there are lots of pores in samples (Fig. 3c).…”

Section: Resultsmentioning

confidence: 97%

“…It is because of the too large size of SiC particles and too fast temperature rise in samples, hence there is not enough time for the mullite grain to grow in one direction. With the coexistence of solid and gas phases, the anisotropic growth of mullite grain is limited to a certain degree [26], thus the growth of mullite grain in every direction is fast, re-sulting in the short rod-like mullite. Compared with the short rod-like mullite, the needle-like mullite whisker is more effective in bridging the microcracks.…”

Section: Resultsmentioning

confidence: 99%

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

Dang

Wei

Zhang

et al. 2017

PAC

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Mullite whisker reinforced Al 2 O 3 -SiC composites were in situ synthesized by microwave sintering at 1500°C for 30 min. The influence of SiC particle size on heating process and properties of Al 2 O 3 -SiC composite were investigated. The XRD and SEM techniques were carried out to characterize the samples. The thermal shock resistance and flexural strength of the samples were examined through water quenching and three-point bending methods, respectively. It was found that the bridging of mullite whisker appeared between Al 2 O 3 and SiC particles which enhanced the thermal shock resistance. A so-called local hot spot effect was proposed dependent on the coupling of SiC particles with microwave, which was the unique feature of microwave sintering. The maximal thermal shock resistance and flexural strength were obtained for the samples with SiC particle size of ∼5 µm.

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Section: Resultsmentioning

confidence: 97%

Section: Resultsmentioning

confidence: 99%

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

Dang

Wei

Zhang

et al. 2017

PAC

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“…Due to the large SiC particle size (125 μm) and rapid temperature rise of samples, the Al 2 O 3 particles and SiO 2 cannot react fully, so, the mullite grains formed had no time to grow. Under the condition of gas-solid two-phase coexistence, the anisotropic growth of mullite grains was limited to a certain extent [37], and the growth rate in all directions was relatively fast, making the mullite phase formed in a short rod-like shape.…”

Section: Analysis Of Experimental Resultsmentioning

confidence: 99%

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

Dang

Shi

et al. 2022

Mathematical Problems in Engineering

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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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“…Reinforcements materials such as particles, whiskers, chopped fibers, etc. are discontinuously distributed in mullite matrix, and the preparation method and performance improvement in preparing mullite composites reinforced by these materials are similar [44][45][46][47][48][49]. In the 1980s, SiC, ZrO 2 and Al 2 O 3 particles as the second phase are used to enhance mullite ceramics.…”

Section: Preparation Methods Of Discontinuous Phase Reinforced Mullitementioning

confidence: 99%

Toughening Mechanism of Mullite Matrix Composites: A Review

Cui

Zhang

et al. 2020

Coatings

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Mullite has high creep resistance, low thermal expansion coefficient and thermal conductivity, excellent corrosion resistance and thermal shock resistance, and plays an important role in traditional ceramics and advanced ceramic materials. However, the poor mechanical properties of mullite at room temperature limit its application. In order to improve the strength and toughness of mullite, the current research focuses on the modification of mullite by using the second phase. The research status of discontinuous phase (particle, whisker, and chopped fiber) and continuous fiber reinforced mullite matrix composites is introduced, including preparation process, microstructure, and its main properties. The reinforcement mechanism of second phase on mullite matrix composites is summarized, and the existing problems and the future development direction of mullite matrix composites are pointed out and discussed.

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Preparation of mullite whiskers and their enhancement effect on ceramic matrix composites

Cited by 18 publications

References 12 publications

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

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

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

Toughening Mechanism of Mullite Matrix Composites: A Review

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