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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。
In order to change the size of SiO2 particles as the main research purpose, the SiC particle reinforced iron matrix composites with 4 mm thick surface composite layer were successfully prepared by casting infiltration method. The microscopic interface and elemental composition of the composites were analyzed by means of optical microscope, SEM and EDS. The results show that gray cast iron has strong penetration ability in SiO2 particles and good interfacial bonding with no obvious casting defects. With the decrease of SiO2 particle size, the sintering of SiO2 particles takes place, the more obvious the reaction is, and the formation of reticular distribution Substrate; a chemical reaction takes place at the microscopic interface of the composite layer to produce a mineral known as fayalite (Fe2SiO4), the formation of which indicates that a metallurgical bond has taken place at the interface causing the microscopic interface Combined with close, and promote the formation of SiO2 granular network structure.