Tensile strength of engineering ceramics.

Fujisawa, Yoshiaki; Matsusue, Katsutoshi; Takahara, Kitao

doi:10.2472/jsms.35.1112

Cited by 8 publications

(3 citation statements)

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“…These result corresponds to the following plasma spraying condition; T p =600[K] and v p =175[m/s]. The broken line in this graph indicates the fracture strength curve of the sintering ceramic material [3]. It was found that the coating stress in deposition layer increased with temperature reducing from solidification temperature.…”

Section: Umerical Analysis Resultsmentioning

confidence: 91%

Modeling of Coating Stress of Plasma-Sprayed Thermal Barrier Coatings

Arai¹

2010

AMM

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Abstract. The surfaces of gas turbine components are coated with thermal barrier coatings (TBCs) using a plasma spraying technique. A lot of effort has been expended examining the TBC interfacial strength, however studies examining how residual stress is formed after the process and how the coating stress changes with temperature are limited. In this report, the residual stress prediction model is proposed based on the splat deposition process. A simplified model including the plasma sprayed process is developed based on shear-lag theory. The simplification is given in continuous particle deposition process. That is, continuous particle deposited coating is modeled as a single layer, which is called by "deposition layer". This deposition layer is assumed to impact directly onto the substrate. The binding layer is also introduced to express multiple cracks caused by quenching stress in splats and sliding deformation at splat boundary. It is shown that the numerical analysis has good agreement with the associated experiments.

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Section: Umerical Analysis Resultsmentioning

confidence: 91%

Modeling of Coating Stress of Plasma-Sprayed Thermal Barrier Coatings

Arai¹

2010

AMM

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“…The physical properties involve elastic modulus, CTE for deposition layer and substrate, and fracture strength of the freestanding ceramic coating, which are dependent on an ambient temperature. The elastic modulus and fracture strength of the freestanding ceramic coating were attributed to those of the ceramic powder itself (7) . Generally speaking, it was known that the elastic modulus of the bulk ceramic coating has approximately ten times the overall elastic modulus of the ceramic coating layer, because the microstructure of the ceramic coating includes a lamellar structure, microcracks, and an open pore (8) .…”

Section: Measurement Procedures Of Strain Gage Methodsmentioning

confidence: 99%

Residual Stress Analysis of Ceramic Thermal Barrier Coating Based on Thermal Spray Process

Arai

Wada

Kishimoto

2007

JMMP

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Residual stress is generated in ceramic thermal barrier coatings (TBCs), which were sprayed by a plasma spray technology, due to the difference in coefficients of thermal expansion between the coating and the substrate. Previous experimental results obtained by the X-ray diffraction method indicated that the residual stress at the ceramic coating surface is tensile and could lead to TBC failure such as cracking and spalling of the ceramic coating. In this study, a numerical model that can predict the residual stress exactly is proposed by taking into account a thermal spray process. This numerical model is a layer-buildup model based on a shear-lag theory, and the residual stress contribution comes from two kinds of the following stress components: (1) quenching stress, which was generated in molten spray particles impinged onto the substrate, and (2) thermal stress, which was generated due to differences in thermal expansion between the deposited particle and the underlying substrate. It is shown herein that residual stress predicted by the proposed numerical model coincided with the experimental one obtained by the strain gage technique, with a good level of accuracy.

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“…The secondary ion intensity ratio of the sample with TiB 2 added to the sample was 0.8 times that of the sample without TiB 2 added, so it did not seem that Ti was contained in the Mg 2 Si particles. In this TOF-SIMS measurement, it was not possible to accurately separate the 48 Ti + peak and 24 Mg 2 + peak by mass. Since the peaks overlapped, it was thought that the 48 Ti + peak contained a large amount of 24 Mg 2 + .…”

Section: Thermal Oxidation Evaluation By Secondary Electronmentioning

confidence: 98%

Oxidation Behavior and Mechanical Strength of Mg<sub>2</sub>Si Added with TiB<sub>2</sub>

Nakada

2022

Mater. Trans.

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Improving the oxidation resistance and mechanical strength of Mg 2 Si is an especially critical issue for practical use in thermoelectric devices. To solve this problem, a sintered sample was prepared by adding 1.1 mol% to 11.0 mol% of TiB 2 powder to Mg 2 Si (0.2 at% Sb) powder, and the oxidation resistance and mechanical strength were evaluated. The oxidation resistance was evaluated by raising the temperature from 300 K to 1023 K in a 200 Pa H 2 O atmosphere using an environmental scanning electron microscope and the sample surface condition was evaluated. In addition, the composition of the sample surface layer before and after oxidation was evaluated by energy dispersive X-ray spectroscopy (EDX). Mechanical strength was evaluated by a three-point bending test from 300 K to 823 K. Thermoelectric properties were measured from 300 K to 773 K.According to EDX analysis, the oxygen concentration in the sample without TiB 2 before and after thermal oxidation was 0.26 at% and 37.15 at%, respectively, while the concentration in the sample containing 3.3 mol% of TiB 2 was 0.02 at% and 6.59 at%, respectively. The bending strength of the sample without TiB 2 was 152.8 MPa at 773 K, and that of the sample with 3.3 mol% TiB 2 was 207.7 MPa at 773 K. The dimensionless figure of merit of Mg 2 Si (0.2 at% Sb) with 3.3 mol% TiB 2 was 0.49 at 773 K, which was the same as without addition of TiB 2 . It was found that the addition of up to 4.4 mol% of TiB 2 to Mg 2 Si can suppress oxidation and improve high temperature bending strength without affecting thermoelectric properties.

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Tensile strength of engineering ceramics.

Cited by 8 publications

References 0 publications

Modeling of Coating Stress of Plasma-Sprayed Thermal Barrier Coatings

Modeling of Coating Stress of Plasma-Sprayed Thermal Barrier Coatings

Residual Stress Analysis of Ceramic Thermal Barrier Coating Based on Thermal Spray Process

Oxidation Behavior and Mechanical Strength of Mg<sub>2</sub>Si Added with TiB<sub>2</sub>

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