Full strength and toughness recovery after repeated cracking and healing in bone-like high temperature ceramics

Osada, Toshio; Watabe, Aiko; Yamamoto, Joji; Brouwer, J.C.; Kwakernaak, C.; Ozaki, Shingo; Zwaag, Sybrand van der; Sloof, Willem G.

doi:10.1038/s41598-020-75552-1

Cited by 11 publications

(6 citation statements)

References 54 publications

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“…7) Ti 2 AlC is a MAX phase ceramic with great potential as a hightemperature heat resistant material owing to its excellent oxidation resistance 17), 18) and self-crack-healing ability. 15), 16) Ti 2 AlC exhibits a bending strength of 275430 MPa 12),19), 20) and fracture toughness of 6.57.0 MPa•m 1/2 ; 7), 20) these values are respectively comparable to and higher than those of Al 2 O 3 , a typical commercial ceramic. 21) Furthermore, composition optimization using machine learning is expected to realize TiAlC MAX phase ceramics with higher mechanical strength and oxidation resistance.…”

Section: Introductionmentioning

confidence: 90%

Influence of cutting damage on the bending strength of Ti<sub>2</sub>AlC MAX phase machinable ceramics

Yamaguchi

Osada

Kuo

et al. 2023

J. Ceram. Soc. Japan

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Ti 2 AlC MAX phase ceramics are excellent candidates for high-temperature heat resistant materials. In addition, they are machinable using cemented carbide tools. However, heavy machining induces many surface cracks, reducing the mechanical strength and reliability of ceramic parts. Herein, we investigated the influence of the machining process on the bending strength and microstructure of Ti 2 AlC ceramics. Nearly fully dense Ti 2 AlC ceramics with elongated grains were machined using a carbide end mill in brittle mode, producing numerous cracks; however, the roughness of the ceramic was similar to that of tool steel cut in ductile mode. Despite its rough surface, the bending strength of the machined Ti 2 AlC was only slightly lower than that of polished Ti 2 AlC. The cracks in the machined Ti 2 AlC ceramics were induced with a kinking structure; however, they stopped at a length equivalent to one grain. The minimum strength of the machined Ti 2 AlC ceramics with a fracture toughness of 6.9 MPa•m 1/2 was estimated by assuming a machining through-crack shape that was as deep as the maximum grain size. Cutting damage was limited to a single grain; thus, the bending strength of the machined Ti 2 AlC was not significantly reduced.

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Section: Introductionmentioning

confidence: 90%

Influence of cutting damage on the bending strength of Ti<sub>2</sub>AlC MAX phase machinable ceramics

Yamaguchi

Osada

Kuo

et al. 2023

J. Ceram. Soc. Japan

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“…It's known that the complex hierarchical architectures of natural materials contribute to their unique mechanical properties. [21][22][23] It is therefore remarkable to know if the mechanical properties of ALB are optimized by the biomimetic hierarchical structures. The microscopic mechanical properties of the ALB constructed under different pressures (P) were studied by nanoindentation.…”

Section: Mechanical Properties and Toughness Mechanismmentioning

confidence: 99%

Hierarchically Engineered Artificial Lamellar Bone with High Strength and Toughness

et al. 2022

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Complex hierarchical architectures are ubiquitous in natural hard tissues, which comprise an elaborate assembly of hard and soft phases spanning from the nanoscale to the macroscale. The elegant architectures grant unique performance in terms of strength and toughness, but the biomimetic fabrication of synthetic materials with highly consistent structural and mechanical characteristics with natural counterparts remains a great challenge. Here, a centimeter‐size artificial lamellar bone is successfully fabricated for the first time via a well‐orchestrated “multiscale cascade regulation” strategy combining multiple techniques of molecular self‐assembly, electrospinning, and pressure‐driven fusion from molecular to macroscopic levels. The bulk artificial lamellar bone that is composed of hierarchically assembled mineralized collagen fibrils with a waiver of any synthetic polymer highly resembles the chemical composition, multiscale structural organization, and rotated plywood‐like structure of natural lamellae, thus achieving a good combination of lightweight and high‐stiffness (Ey ≈ 15.2 GPa), ‐strength (σf ≈ 118.4 MPa), and ‐toughness (KJC ≈ 9.3 MPa m1/2). This multiscale cascade regulation strategy can break through the limitations of a single technique and enable the construction of elaborate composite materials with multiscale step‐by‐step regulations of hierarchically structural organizations for unique mechanical properties.

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“…[27][28][29][30] The ability of ceramics to resist crack propagation is improved and stress concentration at the crack tip is avoided. [31,32] In addition, the purpose of strengthening and toughening can also be achieved by introducing the second phase such as whiskers, fibers, or plate-like grains into the alumina matrix. However, the introduction of the second phase by ball milling or ultrasonic dispersion has problems such as poor dispersion and difficulty densification.…”

Section: Introductionmentioning

confidence: 99%

Strong and Tough Alumina Ceramic from the Particle‐Stabilized Foam

et al. 2022

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Strength and toughness are two vital and contradictory properties, especially in alumina structural ceramics. This mutual exclusion limits the widespread application of advanced alumina ceramics in harsh environments. To deal with this issue, self‐toughening alumina bulk ceramics without any ductile phase and with a unique combination of excellent toughness and reliable strength by combining the foam ceramics with hot‐pressing sintering are prepared. Foam ceramics with honeycomb cellular structures are prepared by particle‐stabilized foaming. Then, the foam ceramics is directly hot pressed sintered, in which the cellular structure is fractured into fragments and completely dense under pressure. Equiaxed grains that constituting the fragments grow anisotropically into plate‐like grains with a large diameter–thickness ratio during hot‐pressing sintering. Plate‐like grains improve the material's fracture toughness by exerting a toughening mechanism similar to that of fibers. The self‐toughening alumina ceramics exhibit a unique combination of high flexural strength (874 ± 31 MPa) and high fracture toughness (6.2 ± 0.1 MPa m1/2). The Vickers hardness also can reach 21 GPa. Herein, a new strategy with relatively simple processing to fabricate high‐performance ceramics based on the widespread ceramic processing techniques are provided.

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Full strength and toughness recovery after repeated cracking and healing in bone-like high temperature ceramics

Cited by 11 publications

References 54 publications

Influence of cutting damage on the bending strength of Ti<sub>2</sub>AlC MAX phase machinable ceramics

Influence of cutting damage on the bending strength of Ti<sub>2</sub>AlC MAX phase machinable ceramics

Hierarchically Engineered Artificial Lamellar Bone with High Strength and Toughness

Strong and Tough Alumina Ceramic from the Particle‐Stabilized Foam

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