INVESTIGATION OF GRAPHITE BODIES. Progress Report No. 3 for the Period March 1, 1959 to May 31, 1959. Includes Appendices: I SYNTHETIC BINDERS FOR CARBON AND GRAPHITE. II. HIGH TEMPERATURE PHYSICAL PROPERTIES OF MOLDED GRAPHITES
Research described in Appendix I conducted under Contracts AF33(616)- 5158; AF33(616)-6143; and AT(33-3)-4. Experimental data regarding the behavior and properties of a wide variety of binders are summarized. It is concluded that the high coke density of furfuryl alcohol (with toluene p-sulfonic acid), coal tar pitch, phenol formaldehyde, and phenol benzaldehyde are worthy of further investigation. A particular problem with the synthetic thermosetting resins is their narrow temperature range of gas evolution in dense structures. Continued work on fabrication techniques demonstrated the need for precise temperature control for molding pitch-bonded specimens, a vacuum enclosure for the mold, and a holding period during molding sufficient to insure temperature equillbrium. Combining these techniques limits variations in green density to less than plus or minus 0.0l gm/cc when 10% or more of thermax is substituted for coke flour. The influence of thermax additions to pitch-bonded coke is summarized and correlated with packing theory. Nearly a thousand specimens of pitchor furfuryl alcohol-bonded coke and coke-thermax have been made and carbonized for graphitization in a single batch. Specimens include 1 x 2 x 1/4-inches, 1 x 1 x 4inches, and 2.3 x 2.3-inches of thickness up to nearly two inches. Difficulties in obtaining sound structure have not been serious except with high-density furfuryl alcohol-bonded coke thermax or the largest specimens. Graphttized densities in excess of 1.8 gm/cc were achieved. Techniques for measuring flexural and tensile strength and flexural dynamic modulus of small specimens at room temperature to the creep threshold were developed and will be applied to experimental graphites. These measurements were applied to a molded commercial graphite (Speer No. 3499) and are appended in summary form. Differential thermograms for the most promising binders were obtained in several atmospheres at increased and reduced pressure. The reactions believed to influence the thermograms are confirmed by shrinkage domains (determined by dilatometry) at the same temperature levels. (auth)
- Research Organization:
- Illinois Inst. of Tech., Chicago. Armour Research Foundation
- DOE Contract Number:
- AF33(616)-6143
- NSA Number:
- NSA-13-017777
- OSTI ID:
- 4234166
- Report Number(s):
- ARF-6039-3; AF33(616)-6143; and AT(33-3)-4
- Resource Relation:
- Other Information: Research described in Appendix I conducted under Contracts AF33(616)-5158; AF33(616)-6143; and AT(33-3)-4. Orig. Receipt Date: 31-DEC-59
- Country of Publication:
- United States
- Language:
- English
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