INVESTIGATION OF GRAPHITE BODIES. Progress Report No. 2 for the Period January 1, 1959 to February 28, 1959
Technical Report
·
OSTI ID:4289463
Binder Investigation. Of the acid catalysts investigated, p-toluene sulfonic acid is superior in producing high coke residues with partially polymerized furfuryl alcohol. Some monomer content appears to be beneficial. Differential Thermal Analysis. In addition to confirming the data obtained from coke-residue trials, differential thermal analysis yields carbon residues of comparable density to those of molded bodies of the same composition. The sensitivity of furfuryl alcoholcoke mixtures to ambient pressure during carbonization is clearly shown by therinograms; the effect of increased pressure is that of repressing those reactions attended by gas evolution. Interrelation Between Physical and Mechanical Measurements. As a result of measurements of flexural strength of several hundred experimental graphite specimens it is concluded that a reasonably simple relation exists between flexural modulus and high-temperature flexural strength for small, multicrystalline, molded graphites of similar structure. This relation is influenced by the density and, consequently, the locked-in'' stresses believed to be responsible for the increase in strength with rising temperature. A Tensile Test for Brittle Materials. Investigation of a technique for measuring tensile strength and modulus of an extruded graphite, an acrylic resin, a porcelain, and a portland cement concrete have shown that the tensile properties of these (in tensile shafts, briquets, and flexural bar specimens) are adequately reflected by those of a circular ring, diametrally compressed. The ease of loading the ring specimens and their geometry suggests their use within furnace enclosures. (auth)
- Research Organization:
- Illinois Inst. of Tech., Chicago. Armour Research Foundation
- NSA Number:
- NSA-13-009697
- OSTI ID:
- 4289463
- Report Number(s):
- NP-7352; Project No. G-039
- Country of Publication:
- United States
- Language:
- English
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