论文标题
Al $ _2 $ o $ _3 $ -CAO大孔陶瓷，含有氢基硅酸盐的阶段
Al$_2$O$_3$-CaO macroporous ceramics containing hydrocalumite-like phases
论文作者
论文摘要
提出了一种解释Caco $ _3 $在基于氧化铝的大孔陶瓷引起的较低发作加强温度的机制，该机制依赖于加工过程中类似氢铝土矿的相形的形成。接近600 $^\ circ $ c，此类阶段被分解为石灰和Mayenite（12CAO $ \ cdot $ 7al $ _2 $ o $ $ _3 $），后者由于其本质上的纳米刺激和高热反应性而产生陶瓷颗粒之间的粘结，在〜700 $^$ c $ c之间产生了纽带，从而产生了$^\ c的强度。基于此前提，作者得出结论，其他CA $^{2+} $来源的行为可能相似。实际上，包含CA（OH）$ _ 2 $或CAO的组合物对增强的温度显示出相同的影响，从而增强了所提出的机制。获得的结果表明，大孔绝缘子可以在较低的温度下进行热处理，只是为了获得足够的机械强度以进行安装，并在原位点火过程中完成。除此之外，较低的烧结温度可用于生产大型陶瓷，这些陶瓷将用于低热需求环境，例如铝工业。
A mechanism to explain the lower onset strengthening temperature induced by CaCO$_3$ in alumina-based macroporous ceramics is proposed, which relies on hydrocalumite-like phase formation during processing. Close to 600$^\circ$C, such phases are decomposed to lime and mayenite (12CaO$\cdot$7Al$_2$O$_3$), where the latter, due to its intrinsic nanoporosity and high thermal reactivity, generates bonds between the ceramic particles at ~700$^\circ$C, resulting in microstructure strengthening. Based on this premise, the authors concluded that other Ca$^{2+}$ sources could act similarly. Indeed, compositions containing Ca(OH)$_2$ or CaO showed the same effect on the onset strengthening temperature, which reinforces the proposed mechanism. The results attained indicated that macroporous insulators could be thermally treated at lower temperatures, just to acquire enough mechanical strength for installation, finishing in situ their firing process. Besides that, lower sintering temperatures could be used to produce macroporous ceramics that would be applied in low thermal demand environments, e.g. aluminum industries.
