Sintering Of A Stainless Steel Scrap Mixture With Powder Of The Same Material. A New Technology For Metal Recycling? [sinterização De Uma Mistura De Cavaco De Aço Inoxidável Com Pó Do Mesmo Material. Uma Nova Tecnologia Para A Reciclagem De Metais?]

The reuse of materials has as its main objective to minimize environmental impacts and to rationalize the use of energy chains. In the present work, samples of scraps of 316 stainless steel mixed with powder of the same material were sintered. For this case, the percentage of scrap was varied from zero to 25% in weight, with 5% increases. After compacting, under a pressure of 600MPa, the samples were sintered simultaneously at a temperature of 1473 K. The mechanical behavior of the final product was evaluated through Assays of Transversal Rupture recommended and normalized by the MPIF - Metal Powder Industries Federation. Using Conventional Quantitative Metallography, the analyses of the sintered samples demonstrated regions of intense diffusion, therefore, regions of sufficiently intense sintering. The mechanical resistance of the samples was compared with the mechanical resistance of the sintered stainless steel with no scrap. The results were greater than expected, demonstrating the viability of this new procedure.60195100GHADIRI, M., FARHADPOUR, F.A., CLIFT, R., SEVILLE, J.P.K., Particle characterization size and morfology (1991) The Institute of Metals Series on Powder Metallurgy -An Overview, pp. 56-75. , London, pSTADTLER, W.A., Production of Metallurgy Parts (1989) ASTM, Powder Metallurgy, pp. 449-463. , Ohio, pLENEL F.V. The early stage of the mechanism of sintering, in powder metallurgy for high-performance application. Syracuse University Press, Binghamton, N.Y., p. 119-137, 1972KEMPTON, H.R., Powder systems and applications (1988) ASTM, Metals Handbook, pp. 568-574. , 9 ed, Ohio, pPowder metallurgy - an overview. 1. ed. The Institute of Metals Series on Powder Metallurgy, London, Great Britain, 1991KUCZYNSKI GC. Fundamentals of sinterig theory, in powder metallurgy for high-performance application. Syracuse University Press, Binghamton, N.Y., p.101-117, 1972Metal Powder Industries Federation. Method for determination of green strength of compacted metal powder specimens. Princeton, N.J.,08540, USA, 1985FERRANTE, M., SINKA, V., Tenacidade à fratura dos aços sinterizados, , São Carlos, SP: UFSCKnysser, W.A., Solid State Sintering (1991) The institute of metals series on powder metallurgy - an overview, pp. 45-53. , London, pMetal Powder Industries Federation, Method for determination of green strength of compacted metal powder specimens, Princeton, N.J.,08540, USA,1985THOMPSON, C.B., Lubrication of metal powder (1988) ASTM, Metals Handbook, pp. 190-193. , 9ed. Ohio, USA, pWILYMAN, P.Q., VANDERMEIREN, M., Selection of atmospheres for sintering (1991) The institute of metals series on powder metallurgy - an overview, pp. 208-218. , London,