COMPARATIVE INVESTIGATION OF VARIOUS METHODS OF ACTIVATED SINTERING OF REDUCED IRON
Author(s)Andriyevskiy, R. A.
Contributor(s)FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OH
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AbstractToroidal compacts of reduced Fe powders were exposed for 2 hr at 1200 + or - 10 C with various atmospheres in an attempt to determine the most effective condition. The sintering conditions were (1) dry H(0.022%H2O), (2) moist H(2%H2O), (3) moist H(10%H2O), (4) preoxidized (1%O), (5) cyclic (3 times with steam, 7 times with H), (6) in an atmosphere of H and HCl, (7) oxidized samples in H and HCl, (8) covered with Al2O3 + 0.1% NH4Cl, and (9) covered with Al2O3 + 0.1% NH4F. The specific gravities of the sintered samples were plotted versus (1) coercive force Hc, (2) maximum magnetic penetration (Mu), (3) magnetic induction in a field of 15 oer (B sub 15), and (4) residual magnetic induction Br. The presence of HCl in the sintering atmosphere had the greatest effect on Mu and Hc. Although admixture of HCl in the atmosphere favorably affect the properties of metallo-ceramic bodies, HCl had a deleterious effect on the corrosion resistance of the samples and further investigation is necessary.