合金元素及SiC_p镀覆对铁基复合材料组织性能的影响

Effects of Me and Coatings on SiC_p on the Properties and Microstructures of Sintered Fe-based Composites

研究了合金元素及SiCp 镀覆对烧结铁基复合材料组织与性能的影响。结果表明 ,在Fe Cu C基体合金中添加w(Ni) =2 % ,w(Mo) =0 .5 % ,w(Fe Cr) =1.5 % ,可以获得高强度、高硬度及综合机械性能优良的铁基合金。在Fe Cu C Ni Mo Cr合金中分别添加SiCp 净质量分数相同的未镀覆的、镀Ni的或镀Cu Ni合金层的SiCp 时 ,会对复合材料的硬度和强度产生不同的影响 ;镀Ni的SiCp 能使复合材料的硬度明显高于基体合金 ,而未镀覆的SiCp 则导致复合材料的硬度明显低于基体合金 ,镀Cu Ni合金层的SiCp 亦使复合材料的硬度略低于基体合金 ;各类SiCp 均使复合材料的抗弯强度低于基体合金 ,镀Ni的SiCp 含量较多时对强度的影响最为显著。基体合金中同时添加Ni、Mo、Cr 3种元素时 ,改善了基体对SiCp 的支撑强度。SiCp 镀覆与基体多元合金化使复合材料的耐磨性大为提高。

The effects of Me and coatings on SiC p on the properties and microstructures of sintered Fe based composites have been studied. The results show that when 2%Ni, 0.5%Mo and 1.5%Fe Cr were added in Fe Cu C, a kind of Fe Cu C Ni Mo Cr strengthening Fe based alloys with high strength and high hardness was obtained. Then bared SiC p, nickel coated SiC p and copper nickel coated SiC p were added in Fe Cu C Ni Mo Cr at the same mass fraction individually, with different effects on the hardness and strength of the composites. Nickel coated SiC p increased the hardness of the composites greatly, bared SiC p reduced the hardness of the composites greatly, and copper nickel coated SiC p reduced the hardness of the composites a little. All kinds of SiC p reduced the strength of the composites, and nickel coated SiC p had the most serious effects. When Ni, Mo and Cr were added in Fe Cu C at the same time, the support of the base for SiC p was improved. Alloying of the base and the coatings on SiC p increased the wear resistence of the composites.