Investigation of the Activated Sintering of Iron Powder
In order to study the process of activated sintering in the solid state of compacts from iron powder, the influence of different compositions and of pure metal was investigated.
The determination of shrinkage, strength, and electrical conductivity of compacts after sintering at different temperatures has shown that the activating action of additions is determined by the degree of mobility of the added metal atoms at the temperatures of sintering. In this connection the most active are those additions which act as sources of the production of the highly mobile atoms, as a result of the oxide reduction or dissociation.
The activation of sintering is manifested by the increasing densificaron of compacts, which changes the strength properties and electrical conductivity. The additions of metal oxides influence the densification more effectively as compared with the additions of the same powdered metals.
Among the metals investigated, the nickel compositions most actively influence the shrinkage; compositions containing cobalt influence it less, and manganese reduces the shrinkage.
The investigations carried out allow formulation of the common principles for the choice of additions for the activation of the sintering process in the solid phase.
KeywordsCobalt Oxide Iron Powder Sintered Material Addition Metal Ultimate Shear Strength
Unable to display preview. Download preview PDF.
- 1.Fedorchenko, I. M., and R. A. Andrievsky, “The Mechanism of Sintering in Single Component Systems,” Powder Met., No. 3: 147 (1959).Google Scholar
- 2.Fedorchenko, I. M, “Studies on Activated Sintering. I. Shrinkage and Process Mechanism,” Poroshkovaya Met., No. 2: 27 (1962).Google Scholar
- 3.Fedorchenko, I. M., “Studies on Activated Sintering. II. Attainable Values for Properties,” Poroshkovaya Met., No. 3: 17 (1962).Google Scholar
- 4.Vacek, J., “Ueber die Beeinflussung des Sinterverhaltens von Wolfram,” Planseeber. Pulvermet. 7(1): 6–17 (1959).Google Scholar
- 5.Vacek, J., “New Information about Sinterability,” Hutnicke Listy 10(8): 469–479 (1955).Google Scholar
- 6.Andrievsky, R. A., and I. M. Fedorchenko, “Influence of Small Additions of Nickel and Cobalt on Sintering of Iron Powder,” Izv. Akad. Nauk SSSR, Otd. Tekhn. Nauk, Met. i Toplivo, No. 3: 50–54 (1961).Google Scholar
- 7.Pines, B. Y., and Y. E. Geguzin, Zh. Tekhn. Fiz. 23(9): 1559 (1953).Google Scholar
- 8.Geguzin, Y. E., “Studying the Sintering of Metallic Powder Mixtures. The Copper-Nickel System, Isometric Powders,” Fiz. Metal, i Mevalloved. 2(3): 406–417 (1956).Google Scholar
- 9.Thümmler, F., “Einfluss geringer mischkristallbindender Legierungsanteile auf das Sinterverhalten,” Planseeber. Pulvermet. 6(1): 2–16 (1958).Google Scholar
- 10.Fedorchenko, I. M., “Factors Influencing the Normal Setting of Metal Powders during Sintering,” Zh. Tekhn. Fiz. 26(9): 2065–2075 (1956).Google Scholar
- 11.Markevich, S. V., Sb. Rabot Inst. Khim. Akad. Nauk BSSR, No. 5(1): 233–239 (1956).Google Scholar