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首页> 外文期刊>Materials Letters >Fabrication of alumina green body through gelcasting process using alginate
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Fabrication of alumina green body through gelcasting process using alginate

机译：用藻酸盐通过凝胶铸造法制备氧化铝生坯

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摘要

In the present work, we studied the addition of sodium alginate, a natural innoxious polymer, to coagulate alumina slurry in the fabrication of an Al_2O_3 green body. Calcium iodate was added into the alumina suspension that was dispersed in a sodium alginate solution. The slurry was stable at room temperature but it solidified with increasing temperature. A slurry of 50 vol.% alumina ceramic powder, 1 wt.% calcium iodate and 1 wt.% sodium alginate solidified after being heated at 60℃ for 1 h. In addition to this process, a chelator was used to control the gelation behavior. Associated with the effect of the chelator, the consolidation reaction rate was delayed to longer than 30 min. The gelling properties of the sodium alginate solution and the resultant alumina slurry were analyzed. The rheological behavior of the slurry was examined. Appropriate forming processes were determined. Near-net-shaped green bodies were produced. The resultant green body has uniform structure and smooth surface, and the bonding strength is as high as 8.0 MPa.
机译：在目前的工作中，我们研究了在制造Al_2O_3生坯时添加海藻酸钠（一种天然的无毒聚合物）来凝结氧化铝浆的问题。将碘酸钙加入分散在藻酸钠溶液中的氧化铝悬浮液中。该浆液在室温下稳定，但随着温度升高而固化。将50体积％的氧化铝陶瓷粉末，1重量％的碘酸钙和1重量％的海藻酸钠的浆液在60℃加热1小时后固化。除此过程外，还使用螯合剂来控制胶凝行为。与螯合剂的作用相关，固结反应速率被延迟到超过30分钟。分析藻酸钠溶液和所得氧化铝浆料的胶凝性质。检查浆料的流变行为。确定了适当的成型工艺。产生了近网状的生坯。所得生坯具有均匀的结构和光滑的表面，并且粘结强度高达8.0MPa。

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