Abstract
Solid state bonding of Al2O3 and SUS 321 stainless steel was carried out under pressures above 0.19kgf/mm2 at temperatures above 900K in a vacuum using the surface precipitation behavior of TiC. Bonding strength was evaluated and bonding mechanism was discussed. Bonding of Al2O3 to SUS 321 occurred at temperatures above 1000 K. However, SUS 321/Al2O3/SUS 321 system of measurable strength could be fabricated at temperatures above 1200 K. Bonding strength was measured with an Instron-type machine. The maximum value of bonding strength was 2.2kgf/mm2, which was obtained at 1200 K and under pressure of 0.75kgf/mm2. The change of the composition at the interface between Al2O3 and SUS 321 was observed with EPMA in order to examine bonding mechanism. The result of EPMA showed that Ti condensed at the interface. It was considered that titanium combined with carbon to form TiC. TiC precpitated at the interface between Al2O3 and SUS 321, and also penetrated into the pore existed in Al2O3. Therefore, the strong bonding between Al2O3 and SUS 321 originated from the precipitation of TiC at the interface.
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