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Preparation of Composite Particles with Multicomponent Dispersed Layer by Two Step Mechanofusion Processed

两步机械融合制备多组分分散层复合颗粒

基本信息

批准号：
03555150
负责人：
TANNO Koichi
金额：
$ 2.69万
依托单位：
Miyagi National College of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Developmental Scientific Research (B)
财政年份：
1991
资助国家：
日本
起止时间：
1991 至 1992
项目状态：
已结题

项目摘要

Composite particles with a double layer and with a multi-component dispersed layer were prepared in order to improve the mechanical characteristics of metal/ceramics sintered materials. Since the coating particles do not segregate from the core particles during processing, composite particle technology can be applied to sintered and spraying materials.Composite particles with double layer or with matrix type were prepared by two step mechanofusion process.Stainless particles of mean particle diameter in 35um were used as core materials. Zirconia particles(0.3um) were used for primary coating of core particles in the first mechanofusion process. Electrolitic Cu particles, spherical stainless(5um) and flaky stainless(15um) were used for secondary coating in the next mechanofusion process.1). Secondary composite particles with a double layer were obtained by coating the consolidated layer primary composite particles with copper particles which easily submit to plastic deformation.2). When primary composite particles with a consolidated layer were submitted to the mechanofusion with spherical stainless steel particles, the primary zirconia layer peeled off. These peeled particles then temporarily coated the fine stainless steel particles, although stable secondary composite particles could not be obtained.3). When primary composite particles with a agglomerated layer were submitted to the mechanofusion with flaky stainless steel particles, zirconia agglomeration of the primary layer adhered to the flaky stainless steel particles. These composite agglomerations then adhered to the core particles again, producing composite particles with a multi-component dispersed layer.

为了改善金属/陶瓷烧结材料的力学性能，制备了具有双层结构和多组分分散层的复合颗粒。采用两步机械熔融法制备了双层或基体型复合粒子，以平均粒径为35 μ m的不锈钢粒子为芯材，通过扫描电镜观察了复合粒子的形貌和结构，并对复合粒子的结构进行了表征。氧化锆颗粒（0.3 μ m）用于第一机械熔合过程中的核心颗粒的初级涂层。电解Cu颗粒、球形不锈钢（5 μ m）和球形不锈钢（15 μ m）用于下一机械融合过程中的二次涂覆。通过在易塑性变形的一次复合颗粒表面包覆易塑性变形的铜颗粒，得到了具有双层结构的二次复合颗粒。当具有固结层的初级复合颗粒经受与球形不锈钢颗粒的机械融合时，初级氧化锆层剥离。这些剥离的颗粒然后暂时包覆细不锈钢颗粒，尽管不能获得稳定的二次复合颗粒。当具有附聚层的初级复合材料颗粒经受与氧化锆不锈钢颗粒的机械融合时，初级层的氧化锆附聚物粘附到氧化锆不锈钢颗粒上。然后这些复合团聚体再次粘附到芯颗粒上，产生具有多组分分散层的复合颗粒。