High-speed grinding of HIP-SiC ceramics on transformation of microscopic features

Wu, Chongjun; Pang, Jingzhu; Li, Beizhi; Liang, Steven Y.

doi:10.1007/s00170-018-03226-4

Cited by 65 publications

(14 citation statements)

References 24 publications

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“…In general, the β → α phase transformation occurs above 1800°C. [14][15][16] However, low-temperature (<1200°C) phase transformations in SiC have been reported, including (a) β → α phase transformation caused by both thermal shock (ΔT ~ 340°C) and very high strain rates (10 −5 -10 −7 s −1 ) during diamond tool machining 17 and (b) 4H → 3C phase transformation at 1150°C attributed to stress generated by oxidation and high doping. 18 The phase transformation in this case is attributed to the oxidation-induced residual thermal stresses.…”

Section: Resultsmentioning

confidence: 99%

Intrinsic microstructures of silica‐bonded porous nano‐SiC ceramics

2020

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Porous SiC-based ceramics are extensively used in various industrial applications such as the purification process of air and water, bio-implants, thermoelectric energy conversion devices, catalytic supports, and thermal insulation, owing to their excellent mechanical properties, high corrosion and oxidation resistances, and tunable thermal and electrical properties. 1-7 Recently, we reported silica-bonded porous nano-SiC ceramics (hereafter, referred to as porous SiC-SiO 2 composites), which exhibited extremely low thermal conductivities (~0.05 Wm −1 K −1). 8,9 The high thermal insulation performance was attributed to the high interfacial thermal resistance of the SiC-SiO 2 interface. The porous SiC-SiO 2 composites exhibited a β-to-α (3C → 6H) polytypic phase transformation at a temperature as low as 600°C. 8,9 In this study, high-resolution transmission electron microscopy (HRTEM) characterization was performed to (a) reveal the intrinsic microstructure and (b) confirm the low-temperature polytypic transformation in the porous SiC-SiO 2 composites. Moreover, the HRTEM images revealed the precipitation of non-graphitic carbons in a porous SiC-SiO 2 composite sintered at 1200°C. This study reveals the underlying mechanisms for the oxidation-induced low-temperature polytypic phase transformation and non-graphitic carbon precipitation. These findings are crucial for the development of SiC-SiO 2-based thermal insulators and metal oxide semiconductor field-effect transistors (MOSFETs). The polytypic phase boundaries (α-β interface) and non-graphitic carbon-SiC heterophase boundaries act as phonon scattering sites. Thus, the thermal insulation performance of the porous SiC-SiO 2 composites could be improved by controlled polytypic phase transformation and non-graphitic carbon precipitation. Similarly, the electrical characteristics of SiC-SiO 2 MOSFETs could be tuned by a polytypic phase transformation and precipitation of the electrically conductive (~10 5 Ω −1 cm −1) 10 non-graphitic carbon phase. 2 | MATERIALS AND METHODS Nano-β-SiC (~50 nm, 97.5 +%, Nanostructured & Amorphous Materials, Inc) and carbon black (∼70 nm, N774,

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Section: Resultsmentioning

confidence: 99%

Intrinsic microstructures of silica‐bonded porous nano‐SiC ceramics

2020

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“…Surface integrity refers to the characteristics of the surface and sub-surface, which include hardness, residual stresses, micro-cracks, grain refinement and phase transformations [57][58][59]. Those process outputs will be strongly influenced by the type of abrasive process selected and its input parameters.…”

Section: Surface and Sub-surface Propertiesmentioning

confidence: 99%

Modelling and monitoring of abrasive finishing processes using artificial intelligence techniques: A review

Pandiyan

Shevchik

Wasmer

et al. 2020

Journal of Manufacturing Processes

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Abrasive finishing processes such as grinding, lapping or disc polishing are one of the most practical means for processing materials to manufacture products with fine surface finish, surface quality and dimensional accuracy. However, they are one of the most difficult and least-understood processes for two main reasons. Firstly, the abrasive grains present in the tool surface are randomly oriented. Secondly, they undergo complex interactions in the machining zone. Given the advances in sensor technologies, the finishing processes can now be sensorized, and the vast amount of data produced can be exploited to model and monitor the processes using Artificial Intelligence techniques. Data-driven models have turned into a hot focus in engineering with the rise of machine learning and deep learning algorithms, which have greatly spread all through the academic community. The scope of this paper is mainly to review the application of Artificial Intelligence as well as supporting sensing and signal processing techniques in modelling and monitoring on different types of abrasive processes in metal finishing. The paper gives a detailed background on the key mechanisms and defects in the different abrasive finishing process and lists the suitable sensing techniques for their monitoring. The paper reports that most of the Artificial Intelligence algorithms available are not fully exploited for monitoring and modelling in abrasive finishing and emphasizes on bridging this gap. The probable research tendency on datadriven monitoring and modelling for abrasive finishing is also forecasted.

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“…Usually, the traditional fabrication of SiC ceramic is sintering and machining approach, inevitable machining defects and damages usually exist owing to the obvious intrinsic brittleness and hardness of SiC ceramic, which will greatly deteriorate their service properties and life [9]. Besides, expensive diamond or super alloy machining tools are always needed for the machining, which increases the manufacturing costs of SiC ceramic.…”

Section: Introduction mentioning

confidence: 99%

Progress and challenges towards additive manufacturing of SiC ceramic

et al. 2021

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Silicon carbide (SiC) ceramic and related materials are widely used in various military and engineering fields. The emergence of additive manufacturing (AM) technologies provides a new approach for the fabrication of SiC ceramic products. This article systematically reviews the additive manufacturing technologies of SiC ceramic developed in recent years, including Indirect Additive Manufacturing (Indirect AM) and Direct Additive Manufacturing (Direct AM) technologies. This review also summarizes the key scientific and technological challenges for the additive manufacturing of SiC ceramic, and also forecasts its possible future opportunities. This paper aims to provide a helpful guidance for the additive manufacturing of SiC ceramic and other structural ceramics.

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High-speed grinding of HIP-SiC ceramics on transformation of microscopic features

Cited by 65 publications

References 24 publications

Intrinsic microstructures of silica‐bonded porous nano‐SiC ceramics

Intrinsic microstructures of silica‐bonded porous nano‐SiC ceramics

Modelling and monitoring of abrasive finishing processes using artificial intelligence techniques: A review

Progress and challenges towards additive manufacturing of SiC ceramic

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