摘要
以改变SiO2颗粒的大小作为主要研究目的,采用铸渗法,成功地制备了表面复合层为4 mm厚的SiO2颗粒增强铁基复合材料。利用光学金相显微镜、SEM和EDS等手段对该复合材料的微观界面和元素组成进行分析。结果表明:灰铸铁在SiO2颗粒中的渗透能力强,界面结合良好,无明显铸造缺陷;随着SiO2颗粒粒度的减小,SiO2颗粒发生了烧结、反应的程度越明显,并形成网状分布于基体上;在复合层的微观界面处发生了化学反应,生成了一种被称为铁橄榄石(Fe2SiO4)的矿物质,这种物质的生成表明,在界面处发生了冶金结合,使微观界面结合紧密,并促进了SiO2颗粒网状结构的形成。
Taking changing the size of SiO2 particles as the research purpose, SiO2 particulate reinforced iron matrix composite was successfully prepared by casting-infiltration method. The thickness of the surface composite layer is 4 mm. The microstructure and elements composition of the composite were analyzed by optical microscope, SEM and EDS. The results show that： the capacity of gray cast＇s penetration in the SiO2 particles is strong, the interracial bond is good and there is no obvious casting defects; with the decrease of SiO2 size, SiO2 particles generate sintering and form a reticular distribution on the substrate. The extent of reaction is more obvious; a mineral called fayalite （Fe2SiO4） is gained resulting from the chemical reaction at the interface of the composite layer. The generation of this kind of materials indicate a metallurgical bonding at the interface, so the microscopic interface combines closely and promotes the formation of the network structure of SiO2 particles.
出处
《热加工工艺》
CSCD
北大核心
2013年第4期113-115,119,共4页
Hot Working Technology
基金
国家自然科学基金项目(51265019)
关键词
铸渗
SIO2
铁基复合材料
网状分布
冶金结合
casting-infiltration
Si02/iron composite
mesh distribution
metallurgical bonding
