| The feasibility of green state joining of Al2O3/ZrO2 ceramics using interlayer with metal Al added is studied in the paper. It is proved that this kind of joining method that adding metal Al in the interlayer first, then co-sintered with the ceramic bodies was feasible, with the maximum three bend strength value of 260MPa.First we took into account the preparing method of the Al powder as the surface of Al powder could be oxidized easily in the atmosphere. By contrasting several methods, we found that it can prevent Al from oxidation and hydrolyze as ball-milled in acetone. Then we investigated the joining effect of three formulas of interlayer, Al/Al2O3, Al/ ZrO2 and Al/Al2O3/ZrO2. By optimizing the sintering process, adjusting the milling time, the SEM graphs showed that the interface is very dense and smooth without visible cracks. Also, the behavior of Al powder in the interlayer during sintering period was analyzed by DSC/TG. Based on this, we discussed the joining mechanism. At last, the influence of the thickness of interlayer and the particle size of Al powder to the joining was discussed. |
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