Microwave versus conventional sintering: Microstructure and mechanical properties of Al2O3–SiC ceramic composites

Mohankumar, Madhan; Prabhakaran, G.

doi:10.1016/j.bsecv.2018.06.001

Cited by 27 publications

(15 citation statements)

References 31 publications

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“…However, pores appear in the samples (indicated by yellow arrows), and their number and size rise obviously with the addition of SiCp. The pore size rises from 30 to 120 nm when the SiCp content increases from 13.0 to 20 wt% (Figure 5F), which is mainly because SiCp hinders the movement of grain boundaries and inhabits the densification of Al 2 O 3 38 …”

Section: Resultsmentioning

confidence: 99%

“…The pore size rises from 30 to 120 nm when the SiCp content increases from 13.0 to 20 wt% ( Figure 5F), which is mainly because SiCp hinders the movement of grain boundaries and inhabits the densification of Al 2 O 3 . 38 It is well known that flexural strength can be calculated according to the following formula: 39 where σ c represents the actual breaking strength, E denotes the elastic modulus, γ represents the surface energy, and c represents the length of the major axis of the elliptical hole. Hence, the larger the pore size, the lower the flexural strength.…”

Section: The Influence Of Sicpmentioning

confidence: 99%

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Preparation, mechanical properties, and toughening mechanisms of SiCw/SiCp‐reinforced zirconia‐toughened alumina ceramics

Liu

Chen

et al. 2020

Int J Applied Ceramic Tech

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Zirconia‐toughened alumina (ZTA) ceramics with high mechanical properties were sintered by hot‐pressing method using SiC particles (SiCp) and SiC whiskers (SiCw) as the reinforcing agents simultaneously. The influences of sintering temperature, SiCp, and SiCw contents on the microstructure and mechanical properties of ZTA ceramics were investigated. It was found that both SiCp and SiCw could contribute to grain refinement significantly and promote the mechanical properties of the ceramics. However, the excess addition of SiCp or SiCw led to the formation of pores with large sizes and degraded the mechanical properties instead. When 13 wt% SiCp was introduced, the maximum flexural strength of 1180.0 MPa and fracture toughness of 15.9 MPa·m1/2 were obtained, whereas the maximum flexural strength of 1314.0 MPa and fracture toughness of 14.7 MPa·m1/2 were achieved at 20 wt% SiCw. Interestingly, the simultaneous addition of SiCp and SiCw could further improve the mechanical properties, and the highest flexural strength of 1334.0 MPa and fracture toughness of 16.0 MPa·m1/2 were achieved at a SiCw/SiCp ratio of 16/4. The reinforcement mechanisms in the ceramics mainly included the phase transformation toughening of ZrO2, the crack deflection and bridging of SiCp and SiCw, and the pull‐out of SiCw.

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Section: Resultsmentioning

confidence: 99%

Section: The Influence Of Sicpmentioning

confidence: 99%

Preparation, mechanical properties, and toughening mechanisms of SiCw/SiCp‐reinforced zirconia‐toughened alumina ceramics

Liu

Chen

et al. 2020

Int J Applied Ceramic Tech

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“…Mohankumar Madhan and Gopalakrishnan Prabhakaran produced Al 2 O 3 -SiC ceramic composites by both conventional and microwave sintering. The results show that the addition of SiC particles, in combination with the microwave sintering method, enhance the properties of Al 2 O 3 -SiC ceramic composites such as higher density and hardness, uniform grain formation, enhanced fracture toughness and reduced sintering time [33].…”

Section: Compositesmentioning

confidence: 96%

A Review of Microwave-Assisted Sintering Technique

Ćurković

Veseli

Gabelica

et al. 2021

TFAMENA

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The present study examines the potential of microwave heating as an emerging and innovative energy-efficient alternative to conventional heating techniques used for different materials, with a focus on the processing of ceramic materials. Modern ceramics are studied extensively, and their use and different applications are wide due to many advantages of these materials. The most important factor in microwave sintering which differentiates it from conventional heating techniques is a unique heat transfer mechanism. Microwave energy is absorbed by the material, hence the transfer of energy takes place at the molecular level. This way, the heat is generated throughout the material, i.e. on the inside as well on the outside. This allows a very low temperature gradient throughout the material cross section. When conventional sintering is used, typically at high heating rates, high temperature gradients pose a problem. The accelerated microwave heating occurs through the whole volume, so the heating is uniform, which limits the grain growth and coarsening, and leads to a uniform and fine microstructure. The densification is accelerated as well during the unique heat transfer mechanism of microwave sintering, which enhances the mechanical properties of the sintered materials.This paper discusses the use of microwave sintering in the manufacturing of different modern technical materials, namely ceramics, composites, metals and alloys, and glasses. The improvement of different properties is described using the available literature.

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“…The main sintering methods for ceramics are hot-pressing (HP) sintering [ 19 , 20 ], microwave (MW) sintering [ 21 ], and spark plasma sintering (SPS) [ 22 ]. MW furnaces are selective to sintered composites, and different composites require different microwave oven parameters.…”

Section: Introductionmentioning

confidence: 99%

Reinforcing Mechanisms of Graphene and Nano-TiC in Al2O3-Based Ceramic-Tool Materials

et al. 2020

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Graphene and nano-TiC, which have good reinforcing effects on Al2O3-based ceramic-tool materials, are generally used as additive phases for ceramics. In this study, nine kinds of samples were sintered, to investigate the effects of graphene and nano-TiC on the reinforcing mechanisms of Al2O3-based ceramics. The experimental results indicated that adding 0.5 vol% graphene and 10 vol% nano-TiC can obtain the optimum flexural strength, fracture toughness, and Vickers hardness, which were 705 ± 44 MPa, 7.4 ± 0.4 MPa m1/2, and 20.5 ± 0.8 GPa, respectively. Furthermore, the reinforcing mechanisms of crack bridging, pull-out of graphene, and pull-out of nano-TiC are identified, which are contributed to improving the mechanical properties of ceramics. Meanwhile, other reinforcing mechanisms induced by graphene (graphene break, crack guiding, and 3D propagation) and nano-TiC (crack branching, crack deflection, and peeling) are discussed. These reinforcing mechanisms are coupled together, while decoupling is hard to work out. Thus, further quantitative studies of reinforcing effects of graphene and nano-TiC on Al2O3-based ceramic-tool materials are necessary to be carried out.

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Microwave versus conventional sintering: Microstructure and mechanical properties of Al2O3–SiC ceramic composites

Cited by 27 publications

References 31 publications

Preparation, mechanical properties, and toughening mechanisms of SiCw/SiCp‐reinforced zirconia‐toughened alumina ceramics

Preparation, mechanical properties, and toughening mechanisms of SiCw/SiCp‐reinforced zirconia‐toughened alumina ceramics

A Review of Microwave-Assisted Sintering Technique

Reinforcing Mechanisms of Graphene and Nano-TiC in Al2O3-Based Ceramic-Tool Materials

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