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Comparative Microstructural Study of the Diffusion Zone between NiCr Alloy and Different Dental Ceramics
C. Heged s1,*,
L. Daróczi2,
V. Kökényesi1 and
D.L. Beke2
1 University of Debrecen, Medical and Health Science Center, Institute of Dental Science, Department of Prosthetic Dentistry, Debrecen, Hungary Nagyerdei krt. 98, H-4012, Hungary; and
2 University of Debrecen, Department of Solid State Physics, Hungary;
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Figure 1. The Ni-Cr Carat system after the firing process recommended by the manufacturer. Two different phases, A and B, developed between the metal (upper side of the Fig. ) and ceramic. The corresponding EDS spectra and electron diffraction pattern can be seen on the inserts.
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Figure 2. The Ni-Cr Vision system after the firing process recommended by the manufacturer. Three different phases (A, B, and C) were observed in the diffusion zone. Phase C, with high Ni and Cr content, has an f.c.c. crystal structure with a lattice parameter of 0.82 nm. The corresponding insert shows the diffraction pattern from the [310] direction.
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Figure 3. The Ni-Cr Carat system after the firing process with increased time. Phases A and B are the same as in Fig. 1, while phase C appeared just after the longer heat treatment.
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Figure 4. Schematic picture of the phase-growing process. At the first stage of the firing process, the crystalline Cr2O3 and amorphous SiOx phases appear (a). At longer firing times, a complex oxide phase starts to grow (b).
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Journal of Dental Research, Vol. 81, No. 5,
334-337 (2002)
DOI: 10.1177/154405910208100509
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