Nondestructive evaluation of physicomechanical properties and technology monitoring in the production of refractory components

Moskovenko, I. B.

doi:10.1007/s11148-006-0036-7

Refract Ind Ceram

2005

DOI: 10.1007/s11148-006-0036-7

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Nondestructive evaluation of physicomechanical properties and technology monitoring in the production of refractory components

I. B. Moskovenko¹

Abstract: Expertise in the use of acoustic nondestructive testing (NDT) methods for evaluation of physicomechanical properties of refractory components employed in the technology of bottom-pouring steels is reported. NDT techniques can be effectively employed in achieving superior performance and stability of physicomechanical properties of refractory materials.

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“…To evaluate those, standard methods based on manufacture and subsequent testing of special specimens may also be accompanied by nondestructive methods such as ultrasonic ones (instruments of the type of Pulsar and UK-10PM), as well as methods based on natural frequencies of the items (instruments of Zvuk, IChSK, and other types) [1]. When one determines those properties of high-modulus carbon fibers, one can also use an ultrasonic method (instruments of UIMU type).…”

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Using the latest electrophysical methods for nondestructive property monitoring on graphitized carbon materials and components

Kadyshkin¹,

Kovarskaya²,

Moskovenko³

et al. 2008

Refract Ind Ceram

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It is possible to monitor the quality of graphitized carbon components by measuring the electrophysical properties, which is demonstrated from experimental studies on the relation between the thermo-EMFs of carbon fibers in relation to the normal elasticity modulus for a particular type of high-modulus carbon fiber. It is shown that current devices can be used to measure the properties in making carbon items with continuous recording of the monitoring results.Graphitized carbon materials are used in heating and other forms of equipment, and their quality is subject to fairly stringent requirements. Nondestructive test methods can be employed in their production to provide prompt monitoring not only during production but also during use.A basic quality criterion for a graphitized material is provided by the physicomechanical properties. To evaluate those, standard methods based on manufacture and subsequent testing of special specimens may also be accompanied by nondestructive methods such as ultrasonic ones (instruments of the type of Pulsar and UK-10PM), as well as methods based on natural frequencies of the items (instruments of Zvuk, IChSK, and other types) [1]. When one determines those properties of high-modulus carbon fibers, one can also use an ultrasonic method (instruments of UIMU type).The properties of graphitized materials can also be judged from the electrophysical parameters, since those properties are substantially influenced by the structural characteristics. Tests have been done on the correlations between structure, physicomechanical properties and electrophysical properties, which show that it is possible to evaluate the physicomechanical properties and the quality not only by direct measurement of those properties but also by measuring the electrophysical ones. These data are based on researches by S. V. Shulepov, A. I. Lutkov, R. M. Levit, A. A. Konkin, V. Ya. Varshavskii, and various other researchers [2 -13].A carbon-base material may have conductivity of metal type or semiconductor type. Also, the anisotropy in the properties of graphite substantially influences the electrical conductivity. The electrical conductivity varies very widely in solids. The bulk specific resistivity is 10 5 -10 6 W × m for insulators, while for full conductors it is less than 10 -6 W × m. This means that electrophysical methods can be applied to researching and monitoring graphitized carbon materials.We consider that the most promising methods for monitoring graphitized materials are the electromagnetic one (eddy currents), and the thermoelectric and electrical-capacity ones. In the mid-1960s, the Soviet Union had developed and routinely produced several types of electrical conductivity meter, including the IE-20 for measuring the electrical conductivity of graphite components by means of eddy currents [2]. Similar instruments were produced and are being produced by foreign firms, but there has been no general use of such instruments in Russian industry up to the present. Most often, Russian industry employs ins...

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confidence: 99%

Using the latest electrophysical methods for nondestructive property monitoring on graphitized carbon materials and components

Kadyshkin¹,

Kovarskaya²,

Moskovenko³

et al. 2008

Refract Ind Ceram

Self Cite

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Mechanism of Excitation of Natural Vibrations of Fireclay Products and Its Application in Flaw Detection

Konovalov,

Kugushev

2023

Refract Ind Ceram

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Mechanism of excitatioon of natural vibrations of fireclay products and its application in flaw detection

Konovalov

Kugushev

2022

Nov. ogneup.

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In this article, using the example of developing a technique for non-destructive testing of a fireclay product («asterisks») using the natural vibrations of the object of control, a mathematical model is presented that allows us to specifically describe the process of converting an external dynamic effect into the natural vibrations of the part. The peculiarity of the model is that, firstly, it is a carrier of the free energy of elastic deformation and the process of natural oscillations is formed in it. Secondly, the model is a Riemannian space in which all dynamic parameters are constant and reduced to zero, i.e. the model does not exist physically, but only as a functional space. The proposed model can serve as an effective tool for analyzing the processes observed during non-destructive testing and vibration diagnostics. Ill. 7. Ref. 22.

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Nondestructive evaluation of physicomechanical properties and technology monitoring in the production of refractory components

Cited by 3 publications

References 1 publication

Using the latest electrophysical methods for nondestructive property monitoring on graphitized carbon materials and components

Using the latest electrophysical methods for nondestructive property monitoring on graphitized carbon materials and components

Mechanism of Excitation of Natural Vibrations of Fireclay Products and Its Application in Flaw Detection

Mechanism of excitatioon of natural vibrations of fireclay products and its application in flaw detection

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