Dynamic Damage Behavior during Cooling Process of Ceramic Coatings

Nishinoiri, Satoshi; Kei, Nozawa; Enoki, Manabu

doi:10.4028/www.scientific.net/msf.449-452.717

Cited by 8 publications

(5 citation statements)

References 3 publications

(3 reference statements)

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“…Synchrotron radiation was used to measure the residual stress field gradient in the fol lowing two ceramic coatings deposited by plasma sputtering: 5 μm thick polycrystalline diamond on a WC + Co substrate and 300 μm thick partly stabilized zirconia on an aluminum substrate [64]. To study the fracture of coatings during thermal cycling loading, the authors of [65] used a contactless method of detecting acoustic signals with a laser interferometer. They revealed a correlation between the rate of energy release during the formation of interphase cracks, which was calculated by a finite element method, and the character of acoustic signals (Fig.…”

Section: Residual Stresses In Coatingsmentioning

confidence: 99%

Effect of residual stresses on the strength of ceramic materials (Review)

Lanin¹

2012

Russ. Metall.

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The causes and laws of the appearance of residual stresses in ceramic materials during technolog ical operations (sintering, annealing, neutron irradiation deformation processing, chemical interaction with a medium) are analyzed using our results and the data obtained by other researchers. The effect of residual stresses on the strength during mechanical static and cyclic loading, the thermal resistance, and the cracking resistance is considered.

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Section: Residual Stresses In Coatingsmentioning

confidence: 99%

Effect of residual stresses on the strength of ceramic materials (Review)

Lanin¹

2012

Russ. Metall.

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“…Acoustic emission (AE) technique is a promising tool for reliability assessment of materials because it can monitor the generation and growth of microcrack in real time. However, conventional contact AE technique has a limit in application at elevated temperature, because a conventional piezoelectric transducer cannot be used above about 800 K. We have investigated the non-contact AE measurement technique using laser interferometer as a AE sensor [4][5][6][7][8][9][10][11]. This laser AE technique has several advantages such as non-contact measurement, absolute velocity measurement of AE signals, and applicability for severe environment.…”

Section: Introductionmentioning

confidence: 98%

<title>Non-contact damage monitoring by laser AE technique</title>

Enoki

Nishinoiri

2005

SPIE Proceedings

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AE method is a well-known technique for in-situ monitoring of fracture behavior by attaching piezoelectric transducer. However, conventional AE transducer cannot be used at elevated temperature or severe environment. Laser based ultrasonic (LBU) technique has been developed to characterize materials properties and detect flaws in materials. We developed the AE measurement system with laser interferometer to apply this technique to microfracture evaluation in various materials. AE during sintering of alumina ceramics and thermal spying of alumina powder on steel substrates were successfully measured by laser interferometers. The effect of processing parameters on AE behavior was clearly observed by analyzing AE waveforms. One of the most advantages of this laser AE technique is to estimate the temperature where microcracks are generated. These results could give a feed back to control processing conditions in order to avoid damage in materials. It was concluded that the laser AE method was very useful to detect microcracks in ceramics during fabrication.

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“…However, the conventional contact AE technique has a limit in application at elevated temperature, because a conventional piezoelectric transducer cannot be used above about 500˚C. The non-contact AE measurement technique was investigated using laser interferometer as a AE sensor [4][5][6][7]. This laser AE technique has several advantages such as non-contact measurement, absolute velocity measurement of AE signals, and applicability for severe environment.…”

Section: Introductionmentioning

confidence: 99%

In-Process Damage Monitoring and Stress Analysis of Thermal Spray Coating

Taniguchi

Enoki

Tomita³

2007

KEM

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AE method is a well-known technique for in-situ monitoring of damage behavior by attached piezoelectric transducer. However, this conventional detection of AE signals has certain limitations. In recent years, numerous efforts have addressed the substitution of laser-based techniques for ultrasonic nondestructive evaluation in place of conventional piezoelectric transducers. Especially, a laser interferometer can be used to measure a displacement or velocity at materials surface using Doppler-shift. However, there are few reports referring to the detection of AE signals in the practical materials and testing because of the difficulty of experiments. We developed the AE measurement system with laser interferometer to apply this technique to microcrack evaluation and reported the quantitative AE analysis in various materials. This paper demonstrates AE results from thermal spray coatings at elevated temperature.

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Dynamic Damage Behavior during Cooling Process of Ceramic Coatings

Cited by 8 publications

References 3 publications

Effect of residual stresses on the strength of ceramic materials (Review)

Effect of residual stresses on the strength of ceramic materials (Review)

<title>Non-contact damage monitoring by laser AE technique</title>

In-Process Damage Monitoring and Stress Analysis of Thermal Spray Coating

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