Open AccessSTUDY ON CYCLIC THERMODURABILITY OF CARBON MATERIALS
Author(s) -
Dmitry M. Kuznetsov,
Vladimir Lavrentyevich Gaponov,
Sergey Ivanovich Buylo
Publication year - 2014
Publication title -
vestnik donskogo gosudarstvennogo tehničeskogo universiteta
Language(s) - English
Resource type - Journals
eISSN - 1992-6006
pISSN - 1992-5980
DOI - 10.12737/3513
Subject(s) - acoustic emission , carbon fibers , materials science , thermal , composite material , work (physics) , signal (programming language) , thermodynamics , physics , computer science , programming language , composite number
The thermodurability of glass carbon — one of the most promising carbon materials used in the production of lum inophors and semico nductor materials, optical single crystals, etc. — is investigated. The aim of this work was to study the behavior of glass carbon in the course of the thermal - cycle testing. As a diagnostic technique of the m icroflow initiation and progress, the signal re ception of acoustic emission was used. It is shown that a heavy disloc ation motion on the thermal - cycle exposure recognized in the acoustic emission signals is observed in the glass carbon samples when heated. As far as the number of impulses is higher whe n heated than on cooling of the sa mple, it implies the damage accumulation in the structure under the thermal - cyclic handling of the glass carbon sa mples. It is found that damage acc u mulation curves reflected by the acoustic emission pulses differ on the s tage of heating and cooling. It is proposed to use a total curve of the acoustic emission pulses as a potent ial destruction sign of a glass - carbon product when heated.