Liquid phase sintering of Si3N4/SiC nanopowders derived from silica fume

Suri, Jyothi; Shaw, Leon L.

doi:10.1016/j.ceramint.2014.01.135

Cited by 18 publications

(6 citation statements)

References 49 publications

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“…Another possible explanation might be the errors introduced in the process of temperature measurement. High temperature (over 1800 °C) will cause the decomposition of silicon nitride, which leads to the decrease of relative density [28]. In addition, due to the good microwave absorbing property of SiC, the temperature of the n-SiC particles is higher than the Si 3 N 4 particles’ during microwave sintering; therefore, a local high temperature region is formed around the n-SiC particles.…”

Section: Resultsmentioning

confidence: 99%

Effects of Microwave Sintering Temperature and Holding Time on Mechanical Properties and Microstructure of Si3N4/n-SiC ceramics

Qiao

Wang

et al. 2019

Materials

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The n-SiC (nanometer SiC) is added to be the additive in order to improve the mechanical performance of Si3N4 ceramics. A microwave sintered the ceramics at different temperature and holding times. The results shows that the Si3N4/n-SiC ceramics (85 wt% Si3N4 + 5 wt% n-SiC + 5 wt% Al2O3 + 5 wt% Y2O3) have the best mechanical properties at 1600 °C, which is beneficial to the densification and β-Si3N4 phase formation for 10 min: the density, hardness, and fracture toughness were 97.1%, 14.44 GPa, and 7.77 MPa·m1/2, which increased by 2.8%, 7.0%, and 13.1%, respectively, when compared with the ceramics (90 wt% Si3N4 + 5 wt% Al2O3 + 5 wt% Y2O3).

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Section: Resultsmentioning

confidence: 99%

Effects of Microwave Sintering Temperature and Holding Time on Mechanical Properties and Microstructure of Si3N4/n-SiC ceramics

Qiao

Wang

et al. 2019

Materials

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“…Nevertheless, compared to as‐processed composites (Figure ), the number and size of micro‐pores in the matrix both decrease after thermal aging. Morphology of single matrix ceramics (Figure ) confirms that the matrix was second‐sintered to an increased densification degree …”

Section: Resultsmentioning

confidence: 99%

Preparation and properties of an oxide fiber‐reinforced silica matrix composite

Gao

Zhang

Chen

et al. 2017

Int J Applied Ceramic Tech

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Oxide (Nextel™ 440) fiber‐reinforced silica composites, with the density and porosity of 1.97 g/cm3 and 21.8%, were prepared through sol‐gel. Their average flexure strength, elastic modulus, shear strength, and fracture toughness at room temperature were 119.7 MPa, 25.6 GPa, 10.8 MPa, and 4.0 MPa·m1/2, respectively. The composites showed typical toughened fracture behavior, and distinct pullout fibers were observed at the fracture surface. Their mechanical properties were performant up to 1000°C, with the maximum flexural strength of 132.2 MPa at 900°C. Moreover, the composites showed good thermal stability, even after thermal aging and thermal shock at elevated temperatures.

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“…Si3N4 ceramics, on the other hand, have more substantial flexural strength and fracture toughness but weaker oxidation resistance at extreme temperatures [7,8]. Si3N4-SiC composite prepared using Si3N4 powders has been widely reported with complex and expensive sintering processes such as SPS [8], Hot-pressed sintering at 1850°C [9], sintering-post-HIP at around 2000°C [10]. On the other hand, using Si powders instead of Si3N4 for synthesizing Si3N4-SiC composites can have economic benefits due to the low cost of the Silicon powder.…”

Section: Introductionmentioning

confidence: 99%

Fabrication, Microstructural, and Mechanical Behavior of SiC Composite with Insitu Formation of BN and Si3N4

Singh

Chaturvedi

et al. 2023

Silicon

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Dealing with high-temperature properties and brittleness and is always one of the hot topics in the field of ceramic materials. Extensive research has been carried out for it and Si3N4-SiC composites are one of the most promising composites. In this study, the impact of Si3N4 and BN reinforcement on the microstructure and physio-mechanical properties of SiC-based composites were explored. Two sets of composites, including Si3N4-SiC and BN-Si3N4-SiC aided with Al2O3, were fabricated using nitridation of Si and B2O3 at 1450°C. The mechanical properties, microstructure, phase transformation, densification, and porosity were depicted and discussed. X-ray diffraction patterns revealed the insitu formation of Si3N4 (both α and β phases) and BN in the final composite. The specimen with 10% Si and 10% B2O3 possessed the superior flexural strength (284.4 MPa) with excellent hardness (23.4 GPa). The incorporation of BN is found to enhance the mechanical properties especially hardness while overcoming the shortcomings of reaction-bonded Si3N4-SiC. The corresponding densification and strengthening mechanism were explained in this paper.

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Liquid phase sintering of Si3N4/SiC nanopowders derived from silica fume

Cited by 18 publications

References 49 publications

Effects of Microwave Sintering Temperature and Holding Time on Mechanical Properties and Microstructure of Si3N4/n-SiC ceramics

Effects of Microwave Sintering Temperature and Holding Time on Mechanical Properties and Microstructure of Si3N4/n-SiC ceramics

Preparation and properties of an oxide fiber‐reinforced silica matrix composite

Fabrication, Microstructural, and Mechanical Behavior of SiC Composite with Insitu Formation of BN and Si3N4

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