Process And Properties Of Cu-bearing Antibacterial Metal Materials

As the combination of functional materials and environmental materials, Cu-bearing antibacterial metal materials possess good prospects because of their advantages such as non-toxic, dainty, wear resistant, long term efficiency and processing easiness, which are not comparable to other antibacterial materials. On basis of current domestic and international research status of antibacterial stainless steels, various types of Cu-bearing antibacterial stainless steel were developed. The effect of heat treatment on properties of Cr13 Mo Cu type martensitic stainless steel was studied by antibacterial test, Vickers hardness measurement, transmission electron microscopy(TEM) observation, confocal laser scanning microscope(CLSM) and scanning electron microscopy(SEM)observations. And the effect of heat treatment and Cu content on properties of 17-4 PH stainless steel was also studied by the above methods. At the same time, the corrosion resistance of 317L-Cu stainless steel was studied by electrochemical test, its antibacterial activity was studied by antibacterial test, and its deformation behavior was studied by a Gleeble 3800 simulator. In addition, based upon the composition of Co Cr Mo/Co Cr WNi alloy, Cu-bearing Co Cr Mo/Co Cr WNi alloy was designed and its antibacterial function was studied. The main conclusions have been made as follows:(1)The optimal heat treatment for 2Cr13 Mo Cu stainless steel was proposed to solution at 1080 ℃ for 30 min, water cooling to room temperature, then aging at 500 ℃for 6~10 h, air cooling to room temperature. And the optimal heat treatment for3Cr13 Mo Cu stainless steel was proposed to solution at 1080 ℃ for 30 min, water cooling to room temperature, then aging at 500 ℃ for 10~14 h, air cooling to room temperature.(2) The optimal heat treatment for 17-4 PH stainless steel was proposed to solution at 1040 ℃ for 30 min, water cooling to room temperature + cryogenic treatment with liquid nitrogen for 30 min, air cooling to room temperature + aging at 482 ℃ for 6 h, air cooling to room temperature, or increased Cu content to 4.5~5.0 wt.% then solution at1040 ℃ for 30 min, water cooling to room temperature + aging at 482 ℃ for 6 h, air cooling to room temperature.(3) Both surface passivation and added RE(La) in the steel could affect the pitting corrosion resistance of 317L-Cu stainless steel. After surface passivation, the pitting corrosion resistance of 317L-Cu stainless steel was improved, but the antibacterial rate was declined; added 0.09 wt. % La in the steel, both pitting corrosion resistance and antibacterial properties of 317L-Cu stainless steel were improved. The processing maps of 317L-Cu stainless steel showed that the optimum processing windows for hot deformation of 317L-Cu stainless steel as follows: e =0.1, T = 950~1010 ℃, e& = 0.010~0.015 s-1; e = 0.2, T = 950~1020 ℃, e& =0.010~0.015 s-1; e =0.3, T = 950~1020 ℃, e& = 0.010~0.020 s-1; e = 0.4, T =950~1020 ℃, e& = 0.010~0.030 s-1; e = 0.5, T = 950~1020 ℃, e& = 0.010~0.050 s-1and T = 1030~1090 ℃, e& = 5~10 s-1.(4)The Cu-bearing Co Cr Mo/Co Cr WNi alloy possessed strong antibacterial properties against both E. coli and S. aureus. and also could effectively inhibit the formation of bacteria bio-films on its surface. Moreover, which keep an equivalent corrosion resistance as Co Cr Mo/Co Cr WNi alloy, and are also biosafety for human body.