Formation of an interface layer on boundary of leucite glassceramics and Ni—Cr-, Co—Cr-alloys at sintering in strong electromagnetic fields
A. А. Ravaev, E. В. Alfeev, I. I. Esakov, E. G. Pan, A. I. Khomenko
AMoscow Radiotechnical Institute RAS, Moscow, Russia
A. G. Bogdanov
Lomonosov Moscow State University, Moscow, Russia
V. A. Ivanov
Prokhorov General Physics Institute RAS, Moscow, Russia
Main results of investigations of processes of interface region formation in "metal—ceramics" structures on
an example of orthopedic dental materials — leucite glassceramics and Ni—Cr-, Co—Cr-alloys — are summered in
this paper. Disadvantages of traditional technology and the reasons of low bonding strength of ceramics with a
metal base at sintering materials in the electro-vacuum furnace are determined. Physicochemical particularities of
oxide "metal—ceramic" interface layer for-mation at synthesis in fields of power electromagnetic radiation are
considered. Sintering of metal—ceramics under action of strong microwaves results in production of materials with a
dense micro-structure without any microcracks and delamination of ceramics from a metal substrate. Abnormal
diffusion and redistribution of ions of chrome, oxygen and other elements is observed in a transition zone.
The important consequence of these structural and phase particularities is essential increase of metal-to-ceramic
adhesion strength that point to practical advantages of proposed technology.
PACS: 81.05.Mh, 81.20.-n
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