梯度多孔Fe-30Mn合金的制备与性能研究

Study on Preparation and Property of Gradient Porous Fe-30Mn Alloys

采用粉末冶金技术制备梯度多孔Fe-30Mn合金,研究了造孔剂分布、烧结温度对梯度多孔Fe-30Mn合金孔隙度和压缩强度的影响,测试梯度多孔Fe合金的耐腐蚀性能,观察了梯度多孔Fe合金的物相组成、显微组织和腐蚀后微观形貌。结果表明:造孔剂含量增加,烧结产物的孔隙度增加,压缩屈服强度降低;烧结温度增加,烧结产物的孔隙度降低,压缩屈服强度增加。SEM和XRD分析表明梯度多孔Fe-30Mn合金由马氏体相(δ相)和奥氏体相(γ相)组成,随着造孔剂含量的增加,梯度多孔Fe-30Mn合金的耐腐蚀性能降低。这表明通过改变造孔剂含量可以调控梯度多孔Fe-Mn合金的腐蚀速率,有助于解决生物医用Fe材料降解速率慢的问题。

In this study, gradient porous Fe-Mn alloys were prepared by powder metallurgy technology. The effects of pore-forming agent distribution, sintered temperature on porosity and compressive properties were investigated. Their corrosion resistance was measured. For gradient porous Fe alloys, phase composition, microstructure and micro-morphology after corrosion were observed. The results show that when increasing the pore-forming agent content the porosity of sintered products increases, the compressive yield strength decreases. When increasing sintering temperature, the porosity of the sintered products decreases and the compressive yield strength increases. SEM and XRD analyses show that martensite phase(δ phase) and austenite phase(γ phase) are formed in the gradient porous Fe-30Mn alloy. The corrosion resistance of gradient porous Fe-30Mn alloy decreases with the increase of pore-forming agents. These results indicate that the corrosion rate of gradient porous Fe-Mn alloy can be controlled by changing the content of pore-forming agent, which is helpful to solve the problem of slow degradation rate of biomedical Fe materials.