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| 悬浮体中团聚体的产生机理及其对材料结构与性能的影响(英文) | |
| 引用本文： | 孙阳,陈瑞峰,丁钰,郭瑞,周立忠,汪长安,黄勇.悬浮体中团聚体的产生机理及其对材料结构与性能的影响(英文)[J].硅酸盐学报,2009,37(2). |
| 作者姓名： | 孙阳 陈瑞峰 丁钰 郭瑞 周立忠 汪长安 黄勇 |
| 作者单位： | 1. 北京科技大学材料科学与工程学院,北京,100083;清华大学材料科学与工程系,北京,100084 2. 清华大学材料科学与工程系,北京,100084 3. 中国钢铁研究总院,北京,100082 |
| 基金项目： | 国家重点基础研究发展规划(973计划) |
| 摘 要： | 研究了陶瓷胶态成型过程悬浮体中产生团聚体的微观机理,根据液体介质中陶瓷粉体颗粒之间的作用势,建立了团聚体产生的微观结构模型.利用环境扫描电子显微镜对悬浮体中粉体团聚的显微结构进行"准"直接观察,发现悬浮体中存在2种团聚体形态:Ⅰ型团聚体(硬团聚)和Ⅱ型团聚体(软团聚),揭示了团聚体的产生是由于浆料的固相含量偏离了稳定固相含量.研究发现:悬浮体中的团聚体会遗传到陶瓷体中,并对陶瓷构件的力学性能有显著影响.探讨了团聚体对烧结体的结构及力学性能影响的原因.当悬浮体中固相含量低于稳定固相体积分数ψ0时,悬浮体中会形成松散团聚即软团聚;当固相含量超过ψ0时,悬浮体中会形成紧密团聚即硬团聚:当固相含量等于ψ0时,悬浮体具有均匀分散的稳定结构.由于悬浮体固相含量偏离稳定周相含量ψ0而在悬浮体中产生的团聚体,会由于原位周化而遗传到坯体之中,影响烧结体结构的均匀性. |
| 关 键 词： | 团聚体 悬浮体 胶态成型 颗粒间作用势 陶瓷 |
MECHANISMS OF THE GENERATION OF AGGLOMERATIONS IN CERAMIC SUSPENSIONS AND INFLUENCE ON CERAMIC STRUCTURES AND PROPERTIES |
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| SUN Yang,CHEN Ruifeng,DING Yi,GUO Rui,ZHOU Lizhong,WANG Changan,HUANG Yong.MECHANISMS OF THE GENERATION OF AGGLOMERATIONS IN CERAMIC SUSPENSIONS AND INFLUENCE ON CERAMIC STRUCTURES AND PROPERTIES[J].Journal of The Chinese Ceramic Society,2009,37(2). | |
| Authors: | SUN Yang CHEN Ruifeng DING Yi GUO Rui ZHOU Lizhong WANG Changan HUANG Yong |
| Affiliation: | 1.School of Materials Science and Engineering;Beijing University of Science and Technology;Beijing 100083;2.Department of Materials Science and Engineering;Tsinghua University;Beijing 100084;3.China Iron and Research Institute Group;Beijing 100082;China |
| Abstract: | The micro mechanisms of the generation of agglomerations in ceramic suspensions used in colloidal forming processing were investigated.On the basis of the potential energy between particles in liquid,a microscopic model of agglomerations in ceramic suspensions is presented.Two types of agglomerations,hard agglomeration and loose agglomeration,were observed by environmental scanning electron microscopy as a quasi-direct method,and it was revealed that the generation of agglomeration is caused by the deviatio... |
| Keywords: | agglomeration suspension colloidal forming potential energy ceramics |
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