Abstract
Existing theories cannot convincingly explain relationships observed during sintering of mixtures and do not always help solve practical problems of sintering metal materials and ceramics. The main weakness of the known theories is insufficient attention to the phenomenon of alloy formation and its effect on volume changes of compacts, faulty ideas regarding driving forces for the sintering process, the mistaken mechanism of dissolution of solid phase in liquid, and the inaccurate mechanisms of growth and densification during the sintering of mixtures. Besides, obsolete theories are developed, as a rule, on the basis of a two-partial model that does not permit taking into account the skeleton structure of a powder body and the presence of interparticle pores in it. Essentially fresh concepts in the theory of mixture sintering are formulated and defined in this paper. The new approaches eliminate the drawbacks and discrepancies in the existing theories and provide the scientific basis for solid state and liquid phase sintering of mixtures.
Highlights
Experimental and theoretical work performed by us has initiated a new scientific trend in the science of sintering systems with interacting components [1]
As a matter of fact, experts ignore the new approach to the problem of sintering mixtures of interacting components, including systems forming intermetallics
From the standpoint of the driving forces for sintering mixtures of interacting components, the definition of the term "sintering" could be formulated as follows: Sintering is a thermal treatment of powder bodies which change their dimensions and physical-mechanical properties as a result of the diffusion flow of the material under the action of alloy formation and capillary forces
Summary
Experimental and theoretical work performed by us has initiated a new scientific trend in the science of sintering systems with interacting components [1]. As a matter of fact, experts ignore the new approach to the problem of sintering mixtures of interacting components, including systems forming intermetallics. At the same time no experts have criticized the fresh ideas put forward in our work. The purpose of this presentation is to introduce scientists and experts to these basic conceptions of the sintering theory of interacting systems. It is time for specialists to accept and adopt the new scientific trend in sintering, develop it further and apply in practice or reject it as false in press
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