Reproducibility and thermal stability of coal-tar pitch
Two aspects of a coal-tar pitch were studied: (1) reproducibility of the properties of as-received pitch as a function of the sampling period, and (2) changes in the properties that occur on heating the pitch for extended periods at elevated temperature. Reproducibility studies were conducted on twelve samples which had sampling histories that divided them into two groups of six samples each. Data indicated little variability of properties within a sample group, but significant variability between the two groups. A single lot of coal-tar pitch was analyzed as a function of residence time in an impregnator at 235 deg C. Properties reflecting increases in molecular size underwent gradual changes with increasing heating time, but the overall changes after 88 days did not appreciably alter the properties or utility of the pitch. (auth)
- Research Organization:
- Oak Ridge Y-12 Plant (Y-12), Oak Ridge, TN (United States)
- DOE Contract Number:
- W-7405-ENG-26
- NSA Number:
- NSA-29-020422
- OSTI ID:
- 4329309
- Report Number(s):
- Y-1922
- Resource Relation:
- Other Information: Orig. Receipt Date: 30-JUN-74
- Country of Publication:
- United States
- Language:
- English
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