Mechanical Properties of Ceramics

Cook, Robert F.; Pharr, George M.

doi:10.1002/9783527603978.mst0123

Cited by 11 publications

(17 citation statements)

References 126 publications

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“…12,20 These values are higher than the strength of alumina polycrystals, usually prepared by sintering at temperatures higher than 1600°C, which ranges from 302 to 488 MPa depending on the grain size of alumina. 21 The a/(a + o) ratio dependence of the fracture toughness (K IC ) is consistent with the trend of the strength ( f ) as predicted by linear elastic fracture mechanics:…”

Section: Resultssupporting

confidence: 80%

Mechanical Properties of Tape‐Cast Alumina‐Glass Dental Composites

Kim

Lee

Kim

1999

Journal of the American Ceramic Society

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Alumina-glass dental composites were prepared by tape casting and sintering at 1120°C, followed by glass infiltration at 1100°C. Flexural strength and fracture toughness of the composites were investigated in terms of the influence of tape constituents, namely, alumina powder, binder, and plasticizer, on the mechanical properties. Both strength and toughness increased with increasing alumina fraction in tapes and decreased with increasing binder content in binder/plasticizer mixtures. These observations were consistent with the influence of the constituents on mean alumina particle distance in tapes, suggesting that the high strength of glass-infiltrated alumina composites is related to toughening by crack bowing. The strength and fracture toughness of the tape-cast composites, optimized for forming dental crowns, were 508 MPa and 3.1 MPaؒm 1/2 , respectively, obtained from biaxial tests. Shrinkage of the composites decreased with increasing thermocompression pressure, applied to the tapes prior to sintering, and heating rate to the sintering temperature.

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Section: Resultssupporting

confidence: 80%

Mechanical Properties of Tape‐Cast Alumina‐Glass Dental Composites

Kim

Lee

Kim

1999

Journal of the American Ceramic Society

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“…However, the SiC-Al 8 B 4 C 7 had higher Young' modulus and hardness than the SiC-10Al 3 BC 3 densified at the same conditions although their density was similar ( Table 3). The specimens densified using the SPS anneal condition (see Table 3) have slightly higher density, Young's modulus and hardness than those using the SPS condition presumably due to the decomposition of SiO 2 , which is lighter and softer than SiC, during heating at 1500 • C. 31 Because the Young's modulus and hardness of the ternary aluminum borocarbides are much lower than those of SiC (401 GPa and 33 GPa, respectively), 32 the properties of the SiC-Al 3 BC 3 are expected to decrease with increasing the amount of Al 3 BC 3 . In fact, the Young's modulus value of the SiC-Al 3 BC 3 was in accordance with the expectation (Table 3).…”

Section: Mechanical Propertiesmentioning

confidence: 96%

Spark plasma sintering and pressureless sintering of SiC using aluminum borocarbide additives

Lee

Tanaka

Kagawa

2009

Journal of the European Ceramic Society

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“…(13) and (15), the viscosities of the aggregate ( u and s ) are dependent on the respective internal viscous strains, which leads to the ''nonlinear'' differential equations of Eqs. (12) and (14).…”

Section: (1) Viscoelastic Constitutive Equationmentioning

confidence: 99%

“…When a constant shear stress 12°i s applied to the model aggregate at time t ‫ס‬ 0, Eqs. (14) and (15) give the shear rate of creep strain ␥ . (t), as follows:…”

Section: Creep Deformation Under Simple Shearmentioning

confidence: 99%

“…The intergranular glassy phase readily softens and melts at high temperatures, which leads to a substantial reduction in strength and other mechanical properties via grainboundary sliding and cavitation. 14 In practical applications of these ceramics at elevated temperatures, these inelastic behaviors indeed have helped these materials acquire a somewhat dubious reputation as high-temperature materials which often yield creep failure in service.…”

Section: Introductionmentioning

confidence: 99%

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Stress Relaxation of Polycrystalline Ceramics with Grain‐Boundary Sliding and Grain Interlocking

Sakai

Muto

Haga

1999

Journal of the American Ceramic Society

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The stress relaxation of two‐phase polycrystalline ceramics has been examined. A two‐dimensional array of elastic hexagonal grains embedded in a contiguous fluid has been used as a model for grain‐boundary sliding and grain interlocking. The viscoelastic constitutive equation, in a phenomenological sense, is of a nonlinear Maxwell type; the model is composed of a strain‐dependent dashpot and an elastic spring connected in series. The squeezing‐in/out processes and mechanisms of grain‐boundary fluid essentially result in the rheological nonlinearity. The experimental results in stress‐relaxation tests of a β‐spodumene glass‐ceramic under simple shear are characterized from the standpoint of the nonlinear constitutive equation. It is emphasized that the stress‐relaxation test is one of the important test techniques that enables one to study quantitatively the rheological behavior of polycrystalline ceramics with grain‐boundary sliding and grain interlocking without any of the difficulties and ambiguities that are accompanied by stress‐induced grain‐boundary cavities, which so often appear in conventional creep tests.

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Mechanical Properties of Ceramics

Cited by 11 publications

References 126 publications

Mechanical Properties of Tape‐Cast Alumina‐Glass Dental Composites

Mechanical Properties of Tape‐Cast Alumina‐Glass Dental Composites

Spark plasma sintering and pressureless sintering of SiC using aluminum borocarbide additives

Stress Relaxation of Polycrystalline Ceramics with Grain‐Boundary Sliding and Grain Interlocking

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