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KMID : 0362120020230020161
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Journal of Technologic Dentistry
2002 Volume.23 No. 2 p.161 ~ p.170
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A Study on Improvement of Metal-Ceramic Bonding Strength by Addition of Aluminum to Casting Metal Alloy
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Lee Jae-Won
Min Byung-Kuk
Han Min-Soo
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Abstract
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The Purpose of this study was to investigate the chemically improvement of metal-ceramics bond strength in the course of recasting Ni-Cr metal composite system with 10wt.%, 20wt.% and 30wt.% aluminum respectively. We have tested the bond strength, micro-structure, chemical composition of each metal composites and metal- ceramic bond interfaces by 3-point bending strength tester, SEM and EDS. We have made the conclusions through this study as follow: 1. The most suitable amount of aluminum to the Ni-Cr metal composite recasting is 20wt. % for improving metal-ceramics bond strength with debonding strength value of 49.54 kgf/mm2. 2. The aluminum must be changed to small spread alumina like phases and second aluminum-metal composites phases in the morphology of Ni-Cr metal composite system by adding during it’s casting. These second phases have inclined functional oxide phases mixed with metal elements and they must take roll to improvement of metal-ceramics bond strength. 3. In the case of 30wt.% aluminum appended to Ni-Cr metal composite system, an excess of second inclined functional oxide phases produce cracks and spalling of them apart from it’s base material. It must be a important factor of reduction of metal-ceramics bond strength.
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KEYWORD
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Metal-ceramic bond strength, recasting Ni-Cr metal composite system, aluminum, alumina, second phases, inclined functional oxide phases
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