Microwave hybrid sintering of Al2O3 and Al2O3–ZrO2 composites, and effects of ZrO2 crystal structure on mechanical properties, thermal properties, and sintering kinetics

Khalid, Muhammad Waqas; Kim, Young Il; Haq, Muhammad Aneeq; Lee, Dongju; Kim, Bum Sung; Liu, Bin

doi:10.1016/j.ceramint.2019.12.147

Cited by 24 publications

(10 citation statements)

References 42 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Zuo et al 19 calculated the estimated activation energy for densification to be 528 ± 22 kJ/mol for uniaxially pressed and conventionally sintered Al 2 O 3 , whereas the estimated activation energy decreased to 440 ± 8 kJ/mol when the sample was sintered by microwave sintering. Khalid et al 18 calculated an estimated activation energy for the densification of 342 ± 77 kJ/mol for uniaxially pressed ZrO 2 added Al 2 O 3 , significantly lower than previously reported values. 44,45 The reduced activation energy for densification was attributed to the microwave effect.…”

Section: F I G U R E 6 X-ray Diffraction (Xrd) Analysis Of (A) Cs a (...mentioning

confidence: 63%

“…When zirconia was added to the alumina, the diffusion and migration of the alumina matrix ions were hindered by the zirconia particles, leading to a decrease in the relative density and average grain size 41 . In addition, a lower relative density implies a higher porosity, and pores produce a pinning effect with Al 2 O 3 grains, leading to grain‐growth reduction 18 …”

Section: Resultsmentioning

confidence: 99%

“…As interfaces, discontinuities, and defects result in step changes in temperature, heat moves from the core of the sample to the surface with a continuous relative temperature loss. 18 In the presence of a susceptor material, such as SiC used in this work, the sample heats up from the surface by absorbing heat from the susceptor, relatively flattening the parabolic temperature-distribution curve along the sample. Hence, the temperature difference between the 18.3 50 277 49 3.3 52 18.9 51 306.9 53 4.2 50 Al 2 O 3 -ZrO 2 (10-30 wt.% ZrO 2 )…”

Section: F I G U R E 6 X-ray Diffraction (Xrd) Analysis Of (A) Cs a (...mentioning

confidence: 97%

“…Microwave hybrid sintering, another sintering method used to consolidate ceramic green bodies, has previously been seen as an alternative to the conventional sintering of Al 2 O 3 and Al 2 O 3 /ZrO 2 with lower energy and time consumption and temperature shifts toward lower readings. [17][18][19][20] However, no significant research has been conducted on the microwave hybrid sintering of green Al 2 O 3 and Al 2 O 3 /ZrO 2 tape casts. Therefore, it is necessary to investigate whether microwave hybrid sintering can enhance the mechanical properties of Al 2 O 3 and Al 2 O 3 /ZrO 2 laminated structures.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Microwave hybrid and conventional sintering of Al₂O₃ and Al₂O₃/ZrO₂ multilayers fabricated by aqueous tape casting

et al. 2023

Self Cite

View full text Add to dashboard Cite

In this study, microwave hybrid sintering and conventional sintering of Al2O3‐ and Al2O3/ZrO2‐laminated structures fabricated via aqueous tape casting were investigated. A combination of process temperature control rings and thermocouples was used to measure the sample surface temperatures more accurately. Microwave hybrid sintering caused higher densification and resulted in higher hardness in Al2O3 and Al2O3/ZrO2 than in their conventionally sintered counterparts. The flexural strength of microwave‐hybrid‐sintered Al2O3/ZrO2 was 70.9% higher than that of the conventionally sintered composite, despite a lower sintering temperature. The fracture toughness of the microwave‐hybrid‐sintered Al2O3 increased remarkably by 107.8% despite a decrease in the relative density when only 3 wt.% t‐ZrO2 was added. The fracture toughness of the microwave‐hybrid‐sintered Al2O3/ZrO2 was significantly higher (247.7%) than that of the conventionally sintered composite. A higher particle coordination and voids elimination due to the tape casting and the lamination processes, the microwave effect, the stress‐induced martensitic phase transformation, and the grain refinement phenomenon are regarded as the main reasons for the mentioned outcomes.

show abstract

Section: F I G U R E 6 X-ray Diffraction (Xrd) Analysis Of (A) Cs a (...mentioning

confidence: 63%

Section: Resultsmentioning

confidence: 99%

Section: F I G U R E 6 X-ray Diffraction (Xrd) Analysis Of (A) Cs a (...mentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Microwave hybrid and conventional sintering of Al₂O₃ and Al₂O₃/ZrO₂ multilayers fabricated by aqueous tape casting

et al. 2023

Self Cite

View full text Add to dashboard Cite

show abstract

“…Khalid et al used hybrid microwave sintering to prepare Al 2 O 3 -ZrO 2 ceramics. The sintering time was significantly reduced while the obtained samples exhibited very high relative densities and increased fracture toughness [30].…”

Section: Application Of Microwave Sintering In the Fabrication Of Different Engineering Materialsmentioning

confidence: 99%

A Review of Microwave-Assisted Sintering Technique

Ćurković

Veseli

Gabelica

et al. 2021

TFAMENA

View full text Add to dashboard Cite

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.

show abstract

A Comparison Study of the Friction and Wear Behavior of Nanostructured Al2O3-YSZ Composite Coatings With and Without Nano-MoS2

et al. 2022

View full text Add to dashboard Cite

Microwave hybrid sintering of Al2O3 and Al2O3–ZrO2 composites, and effects of ZrO2 crystal structure on mechanical properties, thermal properties, and sintering kinetics

Cited by 24 publications

References 42 publications

Microwave hybrid and conventional sintering of Al₂O₃ and Al₂O₃/ZrO₂ multilayers fabricated by aqueous tape casting

Microwave hybrid and conventional sintering of Al₂O₃ and Al₂O₃/ZrO₂ multilayers fabricated by aqueous tape casting

A Review of Microwave-Assisted Sintering Technique

A Comparison Study of the Friction and Wear Behavior of Nanostructured Al2O3-YSZ Composite Coatings With and Without Nano-MoS2

Contact Info

Product

Resources

About

Microwave hybrid sintering of Al2O3 and Al2O3–ZrO2 composites, and effects of ZrO2 crystal structure on mechanical properties, thermal properties, and sintering kinetics

Cited by 24 publications

References 42 publications

Microwave hybrid and conventional sintering of Al2O3 and Al2O3/ZrO2 multilayers fabricated by aqueous tape casting

Microwave hybrid and conventional sintering of Al2O3 and Al2O3/ZrO2 multilayers fabricated by aqueous tape casting

A Review of Microwave-Assisted Sintering Technique

A Comparison Study of the Friction and Wear Behavior of Nanostructured Al2O3-YSZ Composite Coatings With and Without Nano-MoS2

Contact Info

Product

Resources

About

Microwave hybrid and conventional sintering of Al₂O₃ and Al₂O₃/ZrO₂ multilayers fabricated by aqueous tape casting

Microwave hybrid and conventional sintering of Al₂O₃ and Al₂O₃/ZrO₂ multilayers fabricated by aqueous tape casting