摘要
为了研究碳对粉末冶金铁基材料性能的影响,以Fe粉、Cu粉和C粉为原料,在950℃、50MPa条件下放电等离子烧结制备Fe-Cu-C材料。采用扫描电镜、力学万能实验机和洛氏硬度仪对烧结体的微观组织、抗拉强度、抗弯强度和硬度进行了表征,研究了碳的含量、粒度及形态对材料性能的影响,并对比研究了放电等离子烧结和热压试样的性能。结果表明,碳含量在0.5%(质量分数)时材料的抗弯强度最高,且致密化程度最好,而碳含量在1.0%时材料的抗拉强度好。此外,采用放电等离子烧结方式,碳源的选择对材料的性能影响不大,采用热压方式,碳源选择纳米石墨时材料的综合性能最好。在选择不同粒度的石墨时,较细的粉末作为碳源时得到的材料性能更好。
Fe-Cu-C composites were fabricated by SPS technique at 950℃ under pressure of 50MPa with Fe,Cu,C powders as raw materials.The microstructure,tensile strength,bending strength and hardness were characterized by scanning electron microscope（SEM）,mechanical testing machine and rockwell hardness tester,respectively.The effect of carbon content,size and morphology on the composite properties were investigated by comparing SPS to hot press sintering technique.The highest relative density and bending strength are obtained with 0.5% carbon addition;while the highest tensile strength is obtained with 1.0% carbon addition.Additionally,composite properties are independent on the carbon state in SPS technique,however,well comprehensive composite properties can be obtained only by the nano-griphite in hot press sintering.Also,composite properties may be enhanced by using fine particle size of griphite powders.
出处
《粉末冶金技术》
CAS
CSCD
北大核心
2011年第6期425-430,共6页
Powder Metallurgy Technology
