METHOD OF DETERMINING EFFECTIVE TEMPERATURE OF HIGH-TEMPERATURE TREATMENT OF CARBON MATERIALS Russian patent published in 2020 - IPC G01N23/20 G01N21/65 G01K13/00 C01B32/20 

FIELD: chemistry.

SUBSTANCE: invention relates to chemical engineering, particularly to the technology of carbon materials, such as artificial graphites, carbon fibrous materials, carbon-carbon composites, for the production of which high-temperature treatment is used in the temperature range of 1,000 to 3,000 °C. Method of determining the effective temperature of high-temperature treatment carbon materials by parameters of crystal structure of treated material, including experimental thermal treatment is processed material or indicator sample under different temperature conditions, in the temperature range, which need to be controlled, then determining the relationship between treatment temperature and the ID/IG crystal structure parameter (ratio of integral intensities of spectral bands D and G) of the processed material or indicator sample, measured by Raman spectroscopy, constructing calibration relationship of said ratio and calculating the effective temperature of high-temperature treatment of carbon materials from a calibration curve. Method is applicable for artificial graphites, carbon fibrous materials and carbon-carbon composites. Method can be used to control temperature fields of high-temperature treatment furnaces. Besides, when determining the effective temperature of high-temperature treatment of large-size articles, indicator samples representing a carbon fiber rope, PAF of UMT grade 45-12K-EP with length of 2 cm, are placed in a graphite crucible with diameter of not more than 20 mm and length of not more than 30 mm with a cover. Correlation dependence exists between parameters of crystal structure of processed carbon material, such as interlayer distance d₀₀₂, and diameter La, and height of crystallites Lc, and parameter ID/IG.

EFFECT: high accuracy of obtained results, since this technical solution enables determining the temperature of processing carbon materials by Raman spectroscopy of witness samples with an error of ±30 °C.

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