Abstract
The wide use of synthetic materials based on graphite for the fabrication of chemical equipment, especialty heat -exchange equipment, and of pipes, pumps, and other items, is due not only to the desirability of finding substitues for scarce and expensive metals and alloys, but also to the development of processes which cannot be applied successfully to avaflable meta l l ic materials. So far, the mechanical properties of new materials based on graphite have been little studied, and this has retarded their use as structural materials in industry. For this reason, experiments to determine the mechanical characteristics of various graphitoplastics used in the Novocherkassk Electrode Plant have been carried out in the Strength of Materials Laboratory at the Novocherkassk Polytechnic Institute. Values of the ul t imate strength in the temperature range 50 ° to + 115* C have been obtained in shortt ime tensile, compressive, flexure, and shear tests on graphitoplastics ATM-1 and ATM-1 fine fraction. Vahaes of the modulus of elasticity in tension and compression at +20 ° C have also been obtained. Both materials are currently being used in the plant in the production, for example, of heat -exchange apparatus, centrifugal pumps, etc. In preparing ATM-1 graphitoplastic, a mixture of phenolformaldehyde lacquer resin No. 18 (8a.a%0), commercial hexamethylenetet ramine (11.1%0), commercial stearin (3.9%), and hydrated l ime (1.7%) was used as binder. The different components were ground in a ballmil l and mixed with filler according to the formula: graphite grit 33%~ pulverized graphite 49%, binder 18%. The mixture of powders was cleaned on a magnet ic separator, mil led on hot rolls, cooled pulverized in a disintegrator, and sieved. The moIding powder obtained was then ready for rnotding (final production stage). The molding powder for ATM-1 fine fraction material was obtained similarly, except that it was ground a second t ime in a bal l -mil l after pulverization and was screened through finer sieves.
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