Design and Processing of Hollow Ceramic Microspheres and Hybrid Ceramic/Polymer Microparticles

空心陶瓷微球和杂化陶瓷/聚合物微粒的设计与加工

基本信息

批准号：
13555175
负责人：
EGASHIRA Makoto
金额：
$ 8.32万
依托单位：
Nagasaki University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
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/en/grant/KAKENHI-PROJECT-13555175/
关键词：
Alumina PMMA Silica Mechanofusion Hybridization Thermal decomposition Aluminum nitrate Ultrasonic spraying 中空粒子

项目摘要

Design and processing of hollow ceramic microspheres and hybrid ceramic/polymer microparticles were attempted as below.1. Preparation of ceramic microspheres by utilizing a mechanofusion system Core/shell structure was prepared by a mechanofusion system by employing several kinds of spherical polymers as a core material and Al_2O_3 powder or a mixture of Al_2O_3 and SiO_2 powder as a shell material. A large fraction of hollow alumina microspheres reflecting the shape and the particle size distribution of the core polymer could be fabricated after sintering at 1600℃ for 3h, when highly cross-linked PMMA microspheres with a gel fraction of ca. 99% were used as a core polymer and abrupt firing at temperatures higher than 500℃ was adopted to remove the PMMA microspheres. Titania microspheres were also prepared by employing the similar technique.2. Preparation of ceramic microspheres by utilizing a hybridization system Hybrid alumina/PMMA microparticles were prepared by utilizing a hybridiz … More ation system by employing PMMA microparticles and Al_2O_3 powder as a raw material. However, hollow microspheres were scarcely obtained even after calcination at 1600℃, because the Al_2O_3 powder could not be coated around the PMMA microparticles sufficiently.3. Preparation of ceramic microspheres by ultra-spray pyrolysis Alumina microsphreres were successfully fabricated by ultrasonic spraying of 0.5 M Al(NO_3)_3 aqueous solution, followed by instantaneous thermal decomposition and calcination at 1300℃. The crystal phase of as-prepared microspheres was δ-Al_2O_3, but turned into α-Al_2O_3 after post-calcination at 1300℃ for 2h. In addition, some microspheres were changed from solid to hollow structure by the post-calcination. The fraction of hollow microspheres in the resultant products was less than 30% and the mean diameter of these microspheres was 0.7 μm under these preparation conditions. However, the fraction could be increased up to 80% by the addition of a small amount of a surfactant to the precursor solution.4. Fabrication of aluminum/hollow alumina microspheres composites Aluminum/hollow alumina microspheres composites were fabricated by a liquid forging technique by employing aluminum ingot (ADC-12 ; Al>84.4%) and hollow alumina microspheres prepared by a mechanofusion system. The composites showed the highest flexural strength, compared with those prepared from commercially produced alumina bubbles, fly ash and silas balloons. Less

空心陶瓷微球和陶瓷/聚合物杂化微粒的设计和加工进行了如下尝试： 1．采用机械融合系统制备陶瓷微球采用多种球形聚合物作为核材料，采用机械融合系统制备了核/壳结构。以Al_2O_3粉末或Al_2O_3和SiO_2粉末的混合物为壳材料，大部分反映形状的空心氧化铝微球。当使用凝胶分数约为99%的高度交联PMMA微球作为核心聚合物并在高于500℃的温度下突然烧成时，在1600℃下烧结3h后可以制备核心聚合物的粒度分布。采用同样的方法制备了二氧化钛微球。2．利用杂化系统Hybrid制备陶瓷微球。以PMMA微粒和Al_2O_3粉体为原料，采用杂化体系制备了氧化铝/PMMA微粒，但由于Al_2O_3粉体无法包覆在其周围，即使经过1600℃的煅烧也很难得到空心微球。 PMMA微粒充分。3．超喷雾热解氧化铝制备陶瓷微球。通过超声喷涂0.5 M Al(NO_3)_3水溶液,然后在1300℃下瞬时热分解和煅烧成功制备了微球,所得微球晶相为δ-Al_2O_3,但后转变为α-Al_2O_3。 -1300℃煅烧2h 另外，部分微球发生了变化。在这些制备条件下，所得产品中的空心微球的分数小于30％，并且这些微球的平均直径为0.7μm，但是该分数可以增加到80μm。通过在前驱体溶液中添加少量表面活性剂来制备铝/空心氧化铝微球复合材料铝/空心氧化铝微球复合材料。采用液体锻造技术，采用铝锭（ADC-12；Al>84.4%）和机械熔合系统制备的空心氧化铝微球，与商业生产的氧化铝气泡、飞毛制备的复合材料相比，该复合材料表现出最高的弯曲强度。减少灰烬和塞拉斯气球。