X-ray tomography of additive-manufactured zirconia: Processing defects – Strength relations

Saâdaoui, Malika; Khaldoun, F.; Adrien, Jérôme; Reverón, Helen; Chevalier, Jérôme

doi:10.1016/j.jeurceramsoc.2019.04.010

Cited by 52 publications

(32 citation statements)

References 57 publications

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“…With regard to the MILL group, the formation of pores and aggregates may be related to the quality of the raw material powder. The study has also shown that the pores are often concentrated near the surface of the additive manufactured zirconia produced by horizontal building, and such defects on the surface of the tensile side would easily become the areas of stress concentration under the applied load, resulting in the failure of the specimens [ 25 ]. Although the relative densities of both groups were close to each other, the pores of the DLP group were mainly concentrated near the surface, while those of the MILL group were distributed throughout the entire volume.…”

Section: Discussionmentioning

confidence: 99%

Determination of Hardness and Fracture Toughness of Y-TZP Manufactured by Digital Light Processing through the Indentation Technique

Mei

Lou

et al. 2021

BioMed Research International

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Objective. The purpose of the study was to determine the hardness and fracture toughness of dental yttria-stabilized tetragonal zirconia polycrystal (Y-TZP) manufactured by digital light processing (DLP) technology to study its clinical prospects. Methods. The experimental group was DLP-manufactured zirconia, and the control group was milled zirconia. The hardness was investigated under a range of test loads (0.49 N, 0.98 N, 1.96 N, 4.90 N, 9.81 N, 29.42 N, 49.03 N, 98.07 N, and 196.1 N). Meyer’s law was applied to describe the indentation size effect (ISE). Meanwhile, the PSR model and MPSR model were utilized to generate true hardness values. The cracks were observed to be induced by indentation under loads above 49.03 N, while the cracks showed the radial-median type under the load of 196.1 N, under which the fracture toughness was calculated. Results. The true hardness of DLP-manufactured zirconia was 1189 HV based on the PSR model and 1193 HV based on the MPSR model, a bit lower than that of milled zirconia. The fracture toughness was 3.43 ± 0.29 MPa √ m , which showed no statistical difference with the milled zirconia. Conclusion. The dental zirconia manufactured by the DLP 3D printing technique is similar to that manufactured by the conventional milling process in hardness and fracture toughness, thus having a promising future of clinical use.

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Section: Discussionmentioning

confidence: 99%

Determination of Hardness and Fracture Toughness of Y-TZP Manufactured by Digital Light Processing through the Indentation Technique

Mei

Lou

et al. 2021

BioMed Research International

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“…Saâdaoui et al [105] and Khaldoun et al [106] firstly combined a novel SL technology (lithographybased ceramic manufacturing, LCM) with pressureless sintering to prepare a dense 3Y-TZP ceramic. Then, XCT scanning non-destructive testing of the 3Y-TZP ceramic was conducted to quantitatively characterize its internal manufacturing defects in different manufacturing directions, as shown in Fig.…”

Section: Defect Characterization and Controllingmentioning

confidence: 99%

“…Reproduced with permission from Ref. [105], © Elsevier Ltd. 2019. reinforced SiC ceramic matrix composites usually requires two stages: fiber preform preparation and ceramicization. Generally, the preparation of fiber preforms is achieved by some traditional manufacturing technologies, such as layup, puncture, weaving, and so on.…”

Section: Additive Manufacturing Of Ceramic Matrix Compositesmentioning

confidence: 99%

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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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“…Van Bael et al [6] designed porous SLM Ti-6Al-4V structures with different pore sizes based on micro-CT image analysis and optimized the robustness and controllability of the production. Saâdaoui et al [7] demonstrates the suitability of X-ray tomography for both defect detection and predictive mechanical strength estimation in AM zirconia materials. Haleem et al [8] studied the role of CT for design and development of orthopaedic models using AM technologies.…”

Section: Introductionmentioning

confidence: 99%

Micro-CT Evaluation of Defects in Ti-6Al-4V Parts Fabricated by Metal Additive Manufacturing

Gong

Nadimpalli

Rafi³

et al. 2019

Technologies

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In this study, micro-computed tomography (CT) is utilized to detect defects of Ti-6Al-4V specimens fabricated by selective laser melting (SLM) and electron beam melting (EBM), which are two popular metal additive manufacturing methods. SLM and EBM specimens were fabricated with random defects at a specific porosity. The capability of micro-CT to evaluate inclusion defects in the SLM and EBM specimens is discussed. The porosity of EBM specimens was analyzed through image processing of CT single slices. An empirical method is also proposed to estimate the porosity of reconstructed models of the CT scan.

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X-ray tomography of additive-manufactured zirconia: Processing defects – Strength relations

Cited by 52 publications

References 57 publications

Determination of Hardness and Fracture Toughness of Y-TZP Manufactured by Digital Light Processing through the Indentation Technique

Determination of Hardness and Fracture Toughness of Y-TZP Manufactured by Digital Light Processing through the Indentation Technique

Progress and challenges towards additive manufacturing of SiC ceramic

Micro-CT Evaluation of Defects in Ti-6Al-4V Parts Fabricated by Metal Additive Manufacturing

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