TECHNOLOGY OF NON-DESTRUCTIVE CONTROL OF HIGH-TEMPERATURE MATERIALS FOR AEROSPACE AND AERONAUTICAL INDUSTRY

Speaker:
Kazakevych, Mykhail; State Enterprise KOLORAN; Ukraine

Authors:
Andreev, O.V.; State enterprise “ANTONOV”,; Ukraine
Fainleib, O.M.; State enterprise “Koloran” of Institute of Physical Chemistry, National Academy of Sciences of Ukraine; Ukraine
Gusarova, I.O.; State enterprise “Koloran” of Institute of Physical Chemistry, National Academy of Sciences of Ukraine; Ukraine
Kazakevych, M.L.; State enterprise “Koloran” of Institute of Physical Chemistry, National Academy of Sciences of Ukraine; Ukraine
Kazakevych, V.M.; State enterprise “Koloran” of Institute of Physical Chemistry, National Academy of Sciences of Ukraine; Ukraine
Semenets, O.I.; State enterprise “ANTONOV”,; Ukraine

ID: ECNDT-0118-2018
Session: Aerospace 6
Room: G1
Date: 2018-06-13
Time: 13:30 - 13:50

The aerospace and aviation industries are putting forward new requirements for development of high-temperature binding and polymer composite materials (PCM) on heir basis. Particular attention is paid to PCM with a range of operating temperatures 300-4000С. Bisphthalonitrile binders (BFB) represent a new promising class of the high-temperature binders for PCM. Among them the most applicable are oligomers, containing phthalonitrile fragments. Polymerization of starting oligomers is carried out on nitrile groups with the formation of heat-resistant cyclic structures. BFB are non-combustible (the only material class that meets the standard fire resistance, adopted by the US Navy), have high strength properties and very low moisture absorption. Unique properties of carbon fiber reinforced plastic (CFRP), which consists of carbon fiber filaments and bisphthalonitrile binder, provides high strength and very low coefficient of thermal expansion. The main constituent of the CFRP are carbon filaments of about 0.005-0.010 mm in diameter. To strength the plastic it is made multilayered. This leads to the appearance of the bundles – the most typical defect which reduce the strength characteristics significantly. Such features of CFRP allow offering a technology of nondestructive control. Bundle-like defects are detected by complex NDT, using color and luminescent penetrants, which penetrate into the interlayer space and are detected on the background of the “developer”. In connection with the opacity of CFRP in the visible region of the spectrum the additional information is obtained by the use of terahertz radiation about through comprehensive defects. To do this we have to apply penetrants on the water basis, which effectively absorb THz radiation. To produce such penetrant we used a special dye, which was fully non-toxic and synthesized from medicinal raw materials. Thus, through a comprehensive testing, internal defects of structures of the CFRP bundles, critical for ensuring of the construction’s functioning, are detected.