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Fabrication and Characterization of Porous MgAl2O4 Ceramics via a Novel Aqueous Gel-Casting Process

机译：新型水凝胶铸造法制备多孔MgAl2O4陶瓷及其表征

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摘要

A novel and aqueous gel-casting process has been successfully developed to fabricate porous MgAl2O4 ceramics by using hydratable alumina and MgO powders as raw materials and deionized water as hydration agent. The effects of different amounts of deionized water on the hydration properties, apparent porosity, bulk density, microstructure, pore size distribution and compressive strength of the samples were investigated. The results indicated that the porosity and the microstructure of porous MgAl2O4 ceramics were governed by the amounts of deionized water added. The porous structure was formed by the liberation of physisorbed water and the decomposition of hydration products such as bayerite, brucite and boehmite. After determining the addition amounts of deionized water, the fabricated porous MgAl2O4 ceramics had a high apparent porosity (52.5–65.8%), a small average pore size structure (around 1–3 μm) and a relatively high compressive strength (12–28 MPa). The novel aqueous gel-casting process with easy access is expected to be a promising candidate for the preparation of Al2O3-based porous ceramics.
机译：以水合氧化铝和MgO粉为原料，以去离子水为水合剂，成功开发了新型的水凝胶浇铸工艺，制备了多孔MgAl2O4陶瓷。研究了不同数量的去离子水对样品的水化性质，表观孔隙率，堆积密度，微观结构，孔径分布和抗压强度的影响。结果表明，多孔MgAl2O4陶瓷的孔隙率和微观结构受去离子水添加量的控制。多孔结构是由释放的物理吸附水和水合产物（如水铝石，水镁石和勃姆石）的分解形成的。确定去离子水的添加量后，制成的多孔MgAl2O4陶瓷具有较高的表观孔隙率（52.5–65.8％），较小的平均孔径结构（约1-3μm）和相对较高的抗压强度（12–28 MPa） ）。易于获得的新型水凝胶浇铸工艺有望成为制备基于Al2O3的多孔陶瓷的有前途的候选方法。

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