含Ag抗菌双相不锈钢组织及抗菌性能研究

MICROSTRUCTURE AND ANTIBACTERIAL PROPERTIES OF Ag-BEARING DUPLEX STAINLESS STEEL

分别添加纯Ag和Cu-Ag合金颗粒制备了含Ag抗菌双相不锈钢并进行了不同温度固溶处理.借助ESEM,XRD和TEM观察并分析组织中含Ag相显微结构及分布.采用覆膜法测试了材料广谱抗菌性能,并与CD4MCu不锈钢及含Cu抗菌双相不锈钢的抗菌效果进行了对比.结果表明,经1050和1150℃固溶处理,添加纯Ag制备的材料基体上都分布着8μm左右的含Ag相颗粒,提高固溶温度并不能使其在基体中的固溶性得到改善.1150℃固溶后,不锈钢组织中还分布着直径约为45 nm的含Ag相颗粒.添加Cu-Ag合金制备的不锈钢经1050和1150℃固溶处理,温度升高能增强含Ag相在基体中的溶解程度,且添加的合金颗粒越小,含Ag相越易固溶.添加150~300μm Cu-Ag合金制备的不锈钢经1150℃固溶处理,含Ag相在g相上几乎完全固溶,而在a相上呈弥散态分布,且其平均粒径直径约18 nm.抗菌性能检测表明,添加不同粒度CuAg合金制备的2种不锈钢都具有优异的抗菌性能,添加纯Ag颗粒制备的不锈钢抗菌性能良好,CD4MCu不具备抗菌能力.

Nowadays,the events of bacterial infection,food poisoning and biological corrosion damage are increasingly arising.It is urgent to develop new antibacterial material to fight against the drug-resistant bacteria.In this work,Ag-bearing antibacterial duplex stainless steels were prepared by adding Ag or Cu-Ag alloy particles.The microstructure and distribution of Ag-rich phases and Ag electrovalence of the materials after solution treatment at different temperatures have been discussed in detail by ESEM,XRD and TEM.The antibacterial effects of the materials were tested by film-cover method,and compared with CD4 MCu and Cu-bearing antibacterial duplex stainless steel.The results indicated that some Ag-bearing phases in diameter of about 8 μm in the matrix of the material prepared by adding Ag after the solution treatment at 1050 and 1150 ℃ were observed,and increasing temperature could not improve the solution solubility of Ag-bearing phases.In addition,some Ag-bearing phases in diameter of45 nm was found in the matrix of the material after solution treatment at 1150 ℃.For the material prepared by adding Cu-Ag alloy particles after solution treatment at 1050 and 1150 ℃,the solubility of Ag-bearing phases increased with the solution temperature rising.And the smaller the Cu-Ag particles were,the easier the Ag-bearing phases dissolved.For the material prepared by adding Cu-Ag alloy particles in diameter of 150~300 mm after the solution treatment at 1150 ℃,Ag-bearing particles were completely dissolved into g phase while some in diameter of about 18 nm were evenly distributed in a phase.Antibacterial tests showed that Ag-bearing antibacterial duplex stainless steels prepared by adding different sizes of Cu-Ag alloy particles exhibitted excellent antibacterial effect.The material prepared by adding Ag granules had the antibacterial effect.