Effect of molten zone ablated by femtosecond laser on fracture toughness of oxide ceramics

Cui, Jinping; Gong, Zhenyuan; Rao, Pinggen

doi:10.1016/j.jeurceramsoc.2017.12.049

Cited by 17 publications

(16 citation statements)

References 22 publications

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“…K0, which should theoretically represent the KIc-value of purely monoclinic zirconia, serves here merely as fitting parameter, since pure monoclinic zirconia is non-transformable and has been measured to have a KIc of 2.6 MPaÖm measured by Vickers [55,57], up to 3.7 -6.0 MPaÖm using a short-rod Chevron-notch specimen [58]. The curve fit to all the data obtains KIc,cubic = 3.11 MPaÖm, and KIc,cubic = 2.70 MPaÖm if only fitted to our data, both substantially overestimating the experimentally obtained values by Cutler et al [58], Liu et al [59] and Cui et al [60]. The poor goodness-of-fit seen for the fit to all the data results, on the one hand, due to the high variability in KIc-values among studies for x > 3.0, and the small number of data-points available for x < 2.0 on the other hand (e.g.…”

Section: Fracture Toughnesscontrasting

confidence: 58%

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A Revised Relationship Between Fracture Toughness and Y2O3 Content in Modern Dental Zirconias

Belli

Hurle²,

Schürrlein³

et al. 2021

Preprint

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The relationship between fracture toughness and Yttria content in modern zirconia ceramics was revised. For that purpose, we evaluated here 10 modern Y2O3-stabilized zirconia (YSZ) materials currently used in biomedical applications, namely prosthetic and implant dentistry. The most relevant range between 2-5 mol% Y2O3 was addressed by selecting from conventional opaque 3 mol% YSZ up to more translucent compositions (4-5 mol% YSZs). A technical 2YSZ was used to extend the range of our evaluation. The bulk mol% Y2O3 concentration was measured by X-Ray Fluorescence Spectroscopy. Phase quantification by Rietveld refinement are supplied by considering only two tetragonal phases or an additional improbable cubic phase. A first-account of the fracture toughness (KIc) of the partly-sintered materials is given, which amounted to 0.4 – 0.7 MPaÖm. In the fully-densified state, an inverse power-law behavior was obtained between KIc and bulk mol% Y2O3 content, whether using only our measurements or including literature data, challenging some established relationships.

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Section: Fracture Toughnesscontrasting

confidence: 58%

“…Basu et al [64] reported a 57% t-phase transformability for a 2YSZ, 32% for a 2.5YSZ and 3% for a 3YSZ on fractured surfaces. DTS [62] fsl-SEVNB [59,60] Vickers [57] Vickers [63] m + t NBT [51] SCF [68] SCF [52] Pre-cracked CT [26] Short-Rod CN [58] CNB (this study) Vickers [53]…”

Section: Fracture Toughnessmentioning

confidence: 99%

A Revised Relationship Between Fracture Toughness and Y2O3 Content in Modern Dental Zirconias

Belli

Hurle²,

Schürrlein³

et al. 2021

Preprint

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“…Subsequently, Zhao et al [31] revealed that the damage zone in front of V-notch tip was just superfical and could be easily removed by polishing. In addition, based on the fracture analysis and comparison of the measured values before and after acidic pickling (hydrofluoric acid) as well as annealing for Si3N4 [31], 3Y-TZP [32], Al2O3 [32,33] and 8Y-FSZ [32] ceramics, they further proved that the effect of the physical changes of the material (such as remelting and recrystallization) and the residual thermal stress on the fracture toughness measurement results could be ignored. Our previous researches also excluded the influence of laser processing residual stress [11,26,57].…”

Section: Effect Of Notch Depthmentioning

confidence: 94%

Standardization of the Laser Notching Method for Measuring Fracture Toughness in Structural Ceramics

Wang

Zhao

Huang

et al. 2021

Preprint

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The single-edge V-notched beam (SEVNB) method based on the laser notching approach can effectively overcome the shortcoming of time-consuming and avoid large errors in traditional fracture toughness measurement ways, nevertheless the laser notching method has not yet been standardized. Taking oxide (ZrO2 and Al2O3), carbide (SiC), nitride (Si3N4) and boride (ZrB2-based) ceramics as the research objects, this paper systematically discussed the effects of notch tip sharpness, notch depth and equivalent notch angle on the measured value of fracture toughness, thereby clearly defined the range of these parameters that required for measuring the fracture toughness accurately. Furthermore, in order to give full play to the advantages of the laser notching method, the feasibility of sample miniaturization was also discussed. This study could provide important data reference and theoretical basis for the standardization of laser method in the near future.

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“…Specimens with the size of 3 mm × 4 mm × 50 mm were used to measure the three-point flexural strength (σ f ) and elastic modulus (E f ) with a span of 30 mm and a loading rate of 0.5 mm•min -1 [1,38]. The fracture toughness (K IC ) of the as-prepared samples was measured by the single-edge-notched-beam (SENB) method, the size of the specimens was 4 mm (height) × 2 mm (width) × 35 mm (length) with a span of 15 mm and a loading velocity of 0.5 mm•min -1 , and the notches were incised www.springer.com/journal/40145 in the middle of the samples along the height using a circular saw with a width of 0.3 mm to the depth of 1-1.5 mm [39].…”

Section: Characterization Of the Mosi 2 (Cr 5 Si 3 )-Rsic Compositesmentioning

confidence: 99%

High temperature mechanical retention characteristics and oxidation behaviors of the MoSi2(Cr5Si3)—RSiC composites prepared via a PIP—AAMI combined process

et al. 2019

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In the present paper, MoSi 2 (Cr 5 Si 3)-RSiC composites were prepared via a combination of precursor impregnation pyrolysis (PIP) and MoSi 2 −Si−Cr alloy active melt infiltration (AAMI) process. Composition, microstructure, mechanical retention characteristics, and oxidation behaviors of the composites at elevated temperature were studied. X-ray diffraction (XRD) pattern confirms that the composites mainly compose of 6H-SiC, hexagonal MoSi 2 , and tetragonal Cr 5 Si 3. Scanning electron microscopy (SEM) image reveals that nearly dense MoSi 2 (Cr 5 Si 3)-RSiC composites exhibiting three-dimensionally (3D) interpenetrated network structure are obtained when infiltrated at 2173 K, and the interface combination of the composites mainly depends on the composition ratio of infiltrated phases. Oxidation weight gain rate of the composites is much lower than that of RSiC matrix, where MoSiCr2 possesses the lowest value of 0.1630 mg⋅cm −2 , about 78% lower than that of RSiC after oxidation at 1773 K for 100 h. Also, it possesses the highest mechanical values of 139.54 MPa (flexural strength σ f and RT) and 276.77 GPa (elastic modulus E f and RT), improvement of 73.73% and 29.77% as compared with that of RSiC, respectively. Mechanical properties of the composites increase first and then decrease with the extension of oxidation time at 1773 K, due to the cooperation effect of surface defect reduction via oxidation reaction and thermal stress relaxation in the composites, crystal growth, and thickness increase of the oxide film. Fracture toughness of MoSiCr2 reaches 2.24 MPa•m 1/2 (1673 K), showing the highest improvement of 31.70% as compared to the RT value.

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Effect of molten zone ablated by femtosecond laser on fracture toughness of oxide ceramics

Cited by 17 publications

References 22 publications

A Revised Relationship Between Fracture Toughness and Y2O3 Content in Modern Dental Zirconias

A Revised Relationship Between Fracture Toughness and Y2O3 Content in Modern Dental Zirconias

Standardization of the Laser Notching Method for Measuring Fracture Toughness in Structural Ceramics

High temperature mechanical retention characteristics and oxidation behaviors of the MoSi2(Cr5Si3)—RSiC composites prepared via a PIP—AAMI combined process

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