Conclusions
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1.
During the plastic deformation of particles accompanying the pressing of both lightly and severely oxidized aluminum powders, symmetrical cracks are formed in the aluminum oxide, enabling the particles to cold-weld together over local areas free from the oxide; this confirms the results obtained in [2].
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2.
During the sintering of lightly oxidized powders, atoms diffuse over the whole area of contact between the particles.
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3.
When severely oxidized powders undergo sintering, atoms diffuse only in the oxide-free zones, and the area of interparticle contact does not increase in size.
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4.
In the case of lightly oxidized powders exposed to the action of heat in air, sintering quality is affected by the thickness of the oxide films.
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Literature cited
G. A. Meerson, in: Powder Metallurgy [in Russian], Izv. Yaroslavsk. Obi. NTOMASh (1956), p. 175.
N. T. Andreeva andÉ. F. Rastrigina, Poroshkovaya Met., No. 3, 37 (1966).
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Ya. E. Geguzin, Physics of Sintering [in Russian], Nauka (1967).
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Translated from Poroshkovaya Metallurgiya, No. 4 (112), pp. 32–35, April, 1972.
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Gutin, S.S., Panov, A.A. & Khlopin, M.I. Effect of oxide films in the sintering of aluminum powders. Powder Metall Met Ceram 11, 280–282 (1972). https://doi.org/10.1007/BF00800343
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DOI: https://doi.org/10.1007/BF00800343