Effect of Co on thermal and mechanical properties of Si3N4 based ceramic tool material

Tian, Xiaohui; Yan, Kuicheng; Líu, Hao; Zhao, Jun; Yang, Jinyong

doi:10.1016/j.ceramint.2019.06.198

Cited by 18 publications

(3 citation statements)

References 25 publications

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“…Details of the specimen preparation and testing procedure are presented in the Materials and Method section. For ceramics, the three-point bending test is preferred to the commonly used compression test. − This is because the compression test tends to close the processing flaws (such as microcrack and pores) in the material. However, during real-life applications, these processing flaws can be subjected to tensile loading.…”

Section: Results and Discussionmentioning

confidence: 99%

Three-Dimensional Printing of Ceramics through “Carving” a Gel and “Filling in” the Precursor Polymer

Mahmoudi

Wang

Moreno

et al. 2020

ACS Appl. Mater. Interfaces

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Achieving a viable process for three-dimensional (3D) printing of ceramics is a sought-after goal in a wide range of fields including electronics and sensors for harsh environments, microelectromechanical devices, energy storage materials, and structural materials, among others. Low laser absorption of ceramic powders renders available additive manufacturing (AM) technologies for metals not suitable for ceramics. Polymer solutions that can be converted to ceramics (preceramic polymers) offer a unique opportunity to 3D-print ceramics; however, due to the low viscosity of these polymers, so far, their 3D printing has only been possible by combining them with specialized light-sensitive agents and subsequently cross-linking them layer by layer by rastering an optical beam. The slow rate, lack of scalability to large specimens, and specialized chemistry requirements of this optical process are fundamental limitations. Here, we demonstrate 3D printing of ceramics enabled by dispensing the preceramic polymer at the tip of a moving nozzle into a gel that can reversibly switch between fluid and solid states, and subsequently thermally cross-linking the entire printed part "at-once" while still inside the same gel. The solid gel, which is composed of mineral oil and silica nanoparticles, converts to fluid at the tip of the moving nozzle, allows the polymer solution to be dispensed, and quickly returns to a solid state to maintain the geometry of the printed polymer both during printing and the subsequent high-temperature (160 °C) cross-linking. We retrieve the cross-linked part from the gel and convert it to ceramic by high-temperature pyrolysis. This scalable process opens up new opportunities for low-cost and high-speed production of complex three-dimensional ceramic parts and will be widely used for high temperature and corrosive environment applications, including electronics and sensors, microelectromechanical systems, energy and structural applications.

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Section: Results and Discussionmentioning

confidence: 99%

Three-Dimensional Printing of Ceramics through “Carving” a Gel and “Filling in” the Precursor Polymer

Mahmoudi

Wang

Moreno

et al. 2020

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

show abstract

“…The deflection, bridging, and partial surface bonding could be attributed to the residual compressive stress, which enhances the toughness of the Al2O3-TiC-WC-Co layered composites. The presence of Co phase in the composite leads to crack deflection because its low hardness facilitates the absorption of more fracture energy cracks, thus affecting the crack propagation path [13] .…”

Section: Analysis Of the Mechanical Performancementioning

confidence: 99%

“…The difference in coefficient of thermal expansion (CTE) of the Al2O3, TiC, and WC additives in Al2O3-TiC-WC composites induces residual stress in the composite, which results in high wear resistance and improved mechanical properties [6,8,12] . The addition of Co to Al2O3-TiC-WC composites can blunt the crack tip and improve the toughness of the composite owing to its high ductility [8,13] . In this study, the structural layered design, microstructure, and performance, particularly, the fracture behaviour of the Al2O3-TiC-WC-Co layered composites in different directions, were analysed and characterised.…”

Section: Introductionmentioning

confidence: 99%

Fracture behaviour, microstructure, and performance of various layered-structured Al2O3-TiC-WC-Co composites

Liu

Sun

Wang

et al. 2021

Ceramics International

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Cutting performance and wear mechanism of spark plasma–sintered silicon nitride ceramics tool in dry turning of 41Cr4 hardened steel

Wang

Sun

Cao

et al. 2020

Int J Adv Manuf Technol

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Effect of Co on thermal and mechanical properties of Si3N4 based ceramic tool material

Cited by 18 publications

References 25 publications

Three-Dimensional Printing of Ceramics through “Carving” a Gel and “Filling in” the Precursor Polymer

Three-Dimensional Printing of Ceramics through “Carving” a Gel and “Filling in” the Precursor Polymer

Fracture behaviour, microstructure, and performance of various layered-structured Al2O3-TiC-WC-Co composites

Cutting performance and wear mechanism of spark plasma–sintered silicon nitride ceramics tool in dry turning of 41Cr4 hardened steel

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