Preparation of New Inorganic Consolidated Materials Using Mechanochemical Phenomena and the Consolidation Mechanism

利用力化学现象制备新型无机固结材料及其固结机理

基本信息

批准号：
13650891
负责人：
SHIONO Takeshi
金额：
$ 2.05万
依托单位：
Kyoto Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2002
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-13650891/
关键词：
Mechanochemistry Milling NMR Fine powder Consolidated material Aluminum hydroxide Water glass Mechanical strength 微分末熱処理

项目摘要

New inorganic consolidated materials were synthesized by the reaction between potassium silicate solution (water glass), aluminum hydroxide and/or kaolinite, using mechanochemical phenomena. In order to prepare the consolidated materials, it was very important to enhance the mechanochemical phenomena of aluminum hydroxide and kaolinite by mechanical milling in a dry condition. Mechanical milling made their reactivity remarkably enhanced and they became approximately 1000 times as soluble as non-milled. Formation of low coordination number for Al played an important role in enhancement of the reactivity. Dissolution of Als+ ion of aluminum hydroxide into water glass contributed to formation of the consolidation mechanism. The dissolved ion promoted polymerization of water glass, resulting in synthesis of consolidated materials. To develop more practical materials and process, heat treatment before milling was proposed. The treatment accelerated dehydration of aluminum hydroxide and made the hydroxide porous, resulting in easy amorphization by milling in a short time. Accordingly, even milling with lower energy could activate the powder. The consolidated materials prepared with the activated powder exhibited higher bending and compressive strength and better water-resistance than conventional mortar. In case of using kaolinite as a starting material, moreover, the properties of the consolidated materials became much better. The consolidated material in the present project exhibited a potential of a practical material. Mechanochemical process was recognized as an important process not only for powder preparation but also for materials design.

使用机械化学现象，通过硅酸钾溶液（水玻璃），氢氧化铝和/或高岭石之间的反应合成了新的无机合并材料。为了制备合并材料，通过在干燥条件下的机械铣削来增强氢氧化铝和高岭石的机械化学现象非常重要。机械铣削使它们的反应性显着增强，并且它们的溶解度大约是非磨砂的1000倍。 AL的低配位数的形成在增强反应性方面起着重要作用。将ALS+离子溶解在水玻璃中，导致形成巩固机制。溶解的离子促进了水玻璃的聚合，导致合成材料的合成。为了开发更多实用的材料和过程，提出了铣削之前的热处理。该处理加速了氢氧化铝的脱水并使氢氧化物多孔的脱水，从而在短时间内进行铣削，从而易于无形化。因此，即使用较低的能量进行铣削也可以激活粉末。与传统砂浆相比，用活化粉末制备的合并材料表现出更高的弯曲和抗压强度和更好的防水性。此外，如果使用高岭石作为起始材料，合并材料的特性变得更好。本项目中的合并材料表现出实用材料的潜力。机械化学过程被认为是粉末制备的重要过程，而且是材料设计的重要过程。