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Yu. A. Kharlamov 《Powder Metallurgy and Metal Ceramics》1983,22(11):904-909
Conclusions In gasothermic spray-deposition the surface of the basis material experiences self-cleaning as a result of the disintegration of surface films by frictional forces set up by the spreading layer of particles and their subsequent removal to the periphery of the contact zone. The intensity of self-cleaning of the surface of a basis material grows with increasing velocity of the particles being deposited. The self-cleaning phenomenon occurring on the basis material in the zone of collision with particles being deposited facilitates the formation of physical contact with the powder particles subsequently interacting with this zone on the surface of the basis material.Translated from Poroshkovaya Metallurgiya, No. 11(251), pp. 41–47, November, 1983. 相似文献
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Guoqiang Xie Osamu Ohashi Norio Yamaguchi Airu Wang 《Metallurgical and Materials Transactions A》2003,34(11):2655-2661
Metallic powders with various thermodynamic stability oxide films (Ag, Cu, and Al powders) were sintered using a pulse electric-current
sintering (PECS) process. Behavior of oxide films at powder surfaces and their effect on the sintering properties were investigated.
The results showed that the sintering properties of metallic powders in the PECS process were subject to the thermodynamic
stability of oxide films at particles surfaces. The oxide films at Ag powder surfaces are decomposed during sintering with
the contact region between the particles being metal/metal bond. The oxide films at Cu powder surfaces are mainly broken via loading pressure at a low sintering temperature. At a high sintering temperature, they are mainly dissolved in the parent
metal, and the contact regions turn into the direct metal/metal bonding. Excellent sintering properties can be received. The
oxide films at Al powder surfaces are very stable, and cannot be decomposed and dissolved, but broken by plastic deformation
of particles under loading pressure at experimental temperatures. The interface between particles is partially bonded via the direct metal/metal bonding making it difficult to achieve good sintered properties. 相似文献
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