No abstract

Correlation dependences of the Raman spectroscopy parameters of carbon materials on the heat treatment temperature (HTT) are obtained. It is proposed to use the ratio of the integral intensities of the bands D and G, I D /I G , to obtain the most accurate and reproducible results. The choice of carbon fiber (CF) based on polyacrylonitrile (PAN) as witness samples is experimentally justified. It is shown that, for the studied PAN-based CF samples after heat treatment in the treatment temperature range of 1000-3000°C, the parameter I D /I G correlates well with the parameters of X-ray diffraction analysis. A number of examples of the application of the Raman spectroscopy method of witness samples are considered for determination of the "effective" HTT of carbon materials in technological processes for the production of carbon-carbon composite materials, artificial graphite, and PAN-based CF, as well as determination of the temperature fields of both laboratory and industrial equipment designed for high temperature treatment of carbon materials in the temperature range of 1000-3000°C, in particular, in Tamman furnaces, resistance electric vacuum furnaces, and Acheson furnaces.

No abstract

The aim of this work is to evaluate the use of Raman spectroscopy of carbon fibre-based (CF) reference samples for establishing the heat treatment temperature (HTT) in high-temperature (1000 – 3000 °C) furnaces used in production of a series of carbon materials. Based on obtained correlational relationships between Raman spectroscopy parameters and HTT, the use of the ID/IG parameter is suggested for obtaining the most exact and reproducible results. An experimental basis for the use of polyacrylonitrile-based (PAN) CF as reference specimens is provided. It is shown that for PAN-based CF samples treated in the high temperature interval (1000 – 3000 °С) the ID/IG parameter correlates well with X-Ray diffraction analysis parameters. A series of Raman spectroscopy of reference specimens potential uses the in determination of effective HTT of carbon materials in technological processes of production of carbon-carbon based composite materials, artificial graphites and PAN-based CF’s and in the determination of temperature fields of laboratory and industrial equipment for high-temperature treatment of carbon materials in the temperature interval 1000 – 3000 °C, specifically Tamman, vacuum electric resistance and Acheson furnaces, are examined.

No abstract