Novel Direct Coagulation Casting of Alumina Suspensions Using Y3+-Ion Releasing Substances as Coagulant
Novel Direct Coagulation Casting of Alumina Suspensions Using Y3+-Ion Releasing Substances as Coagulant
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DOI：
10.4028/www.scientific.net/kem.602-603.164
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发表时间：
2014-03
期刊：
影响因子：
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通讯作者：
Yue Dong;Xiao Dong Li;Shaohong Liu;Ji Guang Li;Xudong Sun
中科院分区：
文献类型：
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作者：
Yue Dong;Xiao Dong Li;Shaohong Liu;Ji Guang Li;Xudong Sun
直接凝固注模成型是一种较新的陶瓷近净成形工艺，可获得形状复杂、致密度高的均匀陶瓷绿色坯体。研究了添加常用氧化铝陶瓷烧结添加剂Y3+离子对水性氧化铝浆料的直接凝固成型。以Y2 O3粉末和Y（NO3）3两种不同的Y ~（3+）离子释放物质作为混凝剂，分散后直接加入到稳定的氧化铝悬浮液中。与Y_2O_3粉末相比，Y（NO_3）_3作为凝固剂，其凝固时间和合理成型所需的添加量均显著减少。研究了两种凝固剂对绿色坯体和烧结陶瓷性能的影响。根据Y3+离子与外加分散剂之间的相互作用，探讨了Y3+离子的混凝作用机理。
Direct coagulation casting (DCC) is a relatively new ceramic near-net-shape forming process which can form homogeneous ceramic green body with complex shape and high density. Direct coagulation casting of aqueous alumina slurries by adding Y3+ ions, which have been frequently used as additive for the sintering of alumina ceramics, were studied. Two different kinds of Y3+-ion releasing substances, Y2O3 powder and Y(NO3)3, were used as coagulants and were introduced into stabilized alumina suspensions directly after dispersing. Compared with that of Y2O3 powder, both the coagulation time and the added amount required for a reasonable shaping were significantly reduced for using Y(NO3)3 as coagulant. The effects of the two coagulants on the properties of the consolidated green bodies and sintered ceramics were studied. The mechanisms of coagulation induced by the addition of Y3+-ions were discussed on the basis of interactions between Y3+ ions and the added polyelectrolyte dispersant.