Title: On the Sintered Iron Compacts (2nd Report). Effects of Powders of Various Origins on the Properties of the Sintered Iron Compacts
Abstract: The iron powders of various origins such as carbonyl iron, reduced iron, reduced mill scale iron, electrolytic iron, crushed electrolytic iron and crushed low carbon steel were passed through a 300-mesh sieve, and annealed at 750° in H2. Then, these powders were pressed at 3 t/cm2 and sintered at 650∼1350° for 2(1/2) hrs in H2. The same measurements as those in the 1st report were carried out with respect to the specimens thus obtained. The experimental results are summarized as follows:—(1) The effects of the powders of various origins on the properties of the sintered iron compacts can be observed most markedly on the specimens sintered at about 1200°. (2) The differences of the properties of these sintered iron compacts correspond nearly with those of the shrinkage at every sintering stage. (3) These powders may be classified into three groups such as “carbonyl powder”, “reduced powder” and “electrolytic powder or mechanical crushing powder” by the differences of the properties of the sintered compacts.