Al－Al_2O_3粉末成形体烧结性的研究

Study on the Sintering Property of Al-Al_2O_3 Powder-Formed-Body

分析研究了金属Ａｌ在１０００℃左右温度下的存在状态以及在Ａｌ２Ｏ３上浸润性等问题，讨论了Ａｌ－Ａｌ２Ｏ３两相粉末成形体的烧结性能及助烧剂、烧结气氛对材料烧结性能的影响。结果表明，由于金属Ａｌ的活泼性以及生成的Ａｌ２Ｏ３膜的稳定性和金属Ａｌ对Ａｌ２Ｏ３表面浸润性差等原因决定了Ａｌ－Ａｌ２Ｏ３粉末成形体在１０００℃时的烧结性能极差。助烧剂及其反应产物通过形成过渡层的粘结作用和粘－塑性流动调节材料的界面结合性能改善了材料的烧结性能。同时由于氢气气氛和助烧剂发生化学反应而降低了材料的烧结性能。

The problems of the existent state of Al at 1000 ℃ and the wettability of Al arid Al2O3 surface eto,were studied. The sintered property of Al-Al2O3 powder-formed-body and the effect of the aids and atomospheas on the sintering property were also discussed,The results show that since the activity of Al and the stability of Al2O3 layer,and the bad wettability of Al on Al2O3 surface,the sintering property of Al-Al2O3 powder-formed-body at 1000 ℃is extremely bad.The sintering aids and the reaction products can remarkably adjust the interface associativity,and so as to ameliorate the sintering property of the material by forming transition layer and utilizing its sticky effect and viscous-plastic flow at the same time. the sintering property of the material descends since chemical reactions between hydrogen atomosphere and the sintering aids.