摘要
采用粉末压型烧结结合搅拌铸造在铝锌合金基体中添加不同含量石墨GR__p、SiC_p、SiC_p/Al、GR_p/Al和SiC_p+GR_p/Al材料制备了SiC_p-GR_p/Zn-35Al-1.2Mg复合材料。结果表明,SiC_p和GR_p增强体颗粒在基体中混合均匀,单添加SiC_p使基体硬度提高8.5%,单添加GR_p使基体硬度降低15.4%,混合添加使基体硬度降低6.2%;在150N磨损时Zn-Al合金基体温升速率最快,达到45.7℃/s,而仅添加GR_p的复合材料最低,为26.1℃/s。在磨损结束后,温降速率最大的是单独添加GR_p颗粒,达到50.4℃/s,而单独添加SiC_p的最低,为33.6℃/s;30N载荷下磨损600s,GR_p减摩效果最优,使基体磨损量降低19%,60N载荷下磨损600s时SiC_p和GR_p混合颗粒减摩抗磨效果最优,使基体磨损量降低17%,而150N载荷下磨损时单独添加SiC_p抗磨效果最优,使基体耐磨性能提高了34%。
A new type casting SiCp-GRp/Zn-35Al-1.2Mg composites were prepared with adding different content of graphite GRp,SiCp,SiCp/Al、GRp/Al and SiCp＋GRp/Al by powder pressed sintering method combined with stirring casting process.Micro-vickers hardness and as-cast microstructure of the novel aluminum-zinc composites were measured at different loading and time.The results reveal that the reinforced silicon carbide and graphite particles can be distributed uniformly in the matrix,and matrix hardness is increased by 8.5% with single adding SiCp,while the matrix hardness is decreased by 15.4% with only adding GRp,however,matrix hardness is reduced by 6.2% with adding SiCpand GRp.The temperature increment rate of the aluminum matrix zinc alloy reaches 45.7 ℃/s at 150 Nload,while the temperature increment rate of the composites with the single addition graphite particles is only 26.1 ℃/s,however,the temperature decrement rate reaches 50.4℃/s during the wear end stage.Meanwhile,the decrement rate of the composites with single addition silicon carbide particles is 33.6℃/s.At 30 Nfor 600s,anti-friction behavior of the composites with GRp exhibits desirable,and the wear loss of the matrix is reduced by 19%,while at 60 N for 600 s,the anti-friction and anti-wear effect of composites with the silicon carbide and graphite compound particles exhibits desirable,and the wear loss is reduced by 17%.In addition,the wear-resistance index of the composites with only adding SiCp is increased by 34% during wearing at 150 Nload.
出处
《特种铸造及有色合金》
CAS
CSCD
北大核心
2017年第4期407-411,共5页
Special Casting & Nonferrous Alloys
基金
钢铁冶金及资源利用省部共建教育部重点实验室开放基金资助项目(FMRU201305)
