颗粒尺寸对非烧结陶瓷（生坯）结合强度的影响
Role of particles size on the cohesive strength of non-sintered (green) ceramics
摘要：
制备颗粒负载的泡沫，然后干燥、烧结和/或交联是开发具有高机械强度的轻质陶瓷的广泛探索的路线。非烧结干陶瓷泡沫的研究较少，由于其复杂的生产和假定的机械强度差，获得的“绿色”材料。在这里，我们生产轻质陶瓷泡沫颗粒悬浮液含有球形二氧化硅颗粒的半径在4.5 nm和7 μm之间变化。在阳离子表面活性剂的存在下制备湿泡沫，并在环境条件下干燥，以获得质量密度在100和700 kg/m3之间的多孔材料。含有较小颗粒的材料表现出更高的强度（高达2000倍），接近烧结材料。推导了一种新的预测此类材料机械强度的理论表达式，并通过最终干燥材料中颗粒之间的范德华吸引力来解释所生产材料的测量强度。
英文摘要：
Preparation of particle-loaded foams, followed by drying, sintering and/or cross-linking are widely explored routes for developing lightweight ceramics with high mechanical strength. The non-sintered dry ceramic foams are less studied due to their intricate production and the assumed poor mechanical strength of the obtained "green" materials. Here we produce lightweight ceramics from foamed particle suspensions containing spherical silica particles with radii varied between 4.5 nm and 7 μm. The wet foams were prepared in the presence of cationic surfactant and were dried at ambient conditions to obtain porous materials with mass densities between 100 and 700 kg/m3. The materials containing smaller particles exhibited much higher strength (up to 2000 times), approaching that of the sintered materials. A new theoretical expression for predicting the mechanical strength of such materials was derived and was used to explain the measured strengths of the produced materials through the van der Waals attractions between the particles in the final dry materials.
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