Acoustic-mechanical and microscopic investigation of corundum material

• Autorzy: Ranachowski P. , Rejmund F. , Pawełek A. , Piątkowski A.
• Języki publikacji: EN

Abstrakty

EN

This paper presents the results of acoustic emission (AE) measurements of samples under compressive stress. Additional research, concerning structure and parameters of the material, were performed using microscopic and ultrasonic methods. The object of investigation were samples of corundum material C 799 type. The content of alumina in investigated material was equal to 99.7%. The corundum materials demonstrate high mechanical, thermomechanical as well as grindability resistance and find wide application in production of modern technical devices. The aim of study was recognition of stages of degradation processes of the corundum structure. The analysis of AE results pointed out diversified strength and mechanical-acoustic characteristics of particular samples. It was stated during microscopic investigation that the main reason for this effect is due to different grains size and their spatial distribution. The authors consider the abnormal grain growth (AGG) phenomenon as a reason of inhomogeneities of the corundum structures in particular samples. This effect occurs at longer sintering term, especially for fast temperature growth. AGG phenomenon has random character and up to now is not explained in satisfying way.

Słowa kluczowe

EN

corundum material C 799; acoustic emission; abnormal grain growth

• Wydawca: Instytut Podstawowych Problemów Techniki PAN ; Komitet Akustyki PAN ; Polskie Towarzystwo Akustyczne
• Czasopismo: Archives of Acoustics
• Rocznik: 2007
• Tom: Vol. 32, No. 4
• Strony: 963--969
• Opis fizyczny: Bibliogr. 11 poz., rys.

Twórcy

autor

Ranachowski P.

• Institute of Fundamental Technological Research Department of Physical Acoustics Polish Academy of Sciences, Świętokrzyska 21, 00-049 Warszawa, Poland

autor

Rejmund F.

• Institute of Fundamental Technological Research Department of Physical Acoustics Polish Academy of Sciences, Świętokrzyska 21, 00-049 Warszawa, Poland

autor

Pawełek A.

• Aleksander Krupkowski Institute of Metallurgy and Materials Science Polish Academy of Sciences Reymonta 25, 30-059 Kraków, Poland

autor

Piątkowski A.

• Aleksander Krupkowski Institute of Metallurgy and Materials Science Polish Academy of Sciences Reymonta 25, 30-059 Kraków, Poland

Bibliografia

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• [2] IEC Publication 672-1:1995 Ceramic and glass-insulating materials, Part 1: Definitions and classification.
• [3] IEC Publication 672-2:1999 Ceramic and glass-insulating materials, Part 2: Methods of test.
• [4] IEC Publication 672-3:1997 Ceramic and glass-insulating materials, Part 3: Specifications for individual materials.
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