基于ASPN的不锈钢表面复合共渗层组织结构和性能研究

发布时间：2018-05-12 13:12

本文选题：316不锈钢 + 活性屏离子氮化　；参考：《太原理工大学》2017年硕士论文

【摘要】：316不锈钢具有价格低廉、优异的耐蚀性、力学性能良好及良好的生物相容性等优点,作为生物医用植入材料,在牙齿矫正、整形外科、血管支架等方面得到了广泛的应用。然而,由于其硬度低、易黏着、耐磨性能差,且基本不具有抗菌性能,限制了316不锈钢在医疗和食品加工行业的应用。因此,在保持不锈钢良好的耐蚀性同时提高不锈钢的硬度、耐磨性并赋予不锈钢良好抗菌性能亟需解决的问题。本文采用基于活性屏离子渗氮技术(ASPN)的等离子处理技术,即用纯银或铜板作为不锈钢活性屏的顶盖,在不锈钢表面制备了Ag-N和Cu-N复合共渗层,分别对Ag-N和Cu-N两种共渗层处理后试样的组织结构、硬度、耐腐蚀性能、摩擦磨损性能及抗菌性能进行了研究。主要研究结果如下:(1)采用改进的ASPN技术在316奥氏体不锈钢表面制备均匀且致密的由Ag或Cu掺杂S相纳米结构沉积层和S相扩散层组成的Ag-N或CuN复合共渗层。Ag-N共渗层的膜层总厚度约为12.0μm,其中沉积层的厚度为0.6μm。Cu-N复合共渗层膜层总厚度为12.0μm,沉积层的厚度达到为2.0μm。(2)经过氮化后的Ag-N和Cu-N复合共渗层试样,其表面硬度较不锈钢基体均显著提高。其中试样Ag-N和Cu-N共渗层表面硬度分别可提高至1259 HV0.05和1300 HV0.05,为不锈钢基材硬度的3-4倍。(3)在干摩擦条件下,Ag-N和Cu-N共渗层及不锈钢基材的磨损机制均为粘着磨损和磨粒磨损。在人工模拟体液中Ag-N和Cu-N共渗层及不锈钢基材的磨损机制均为粘着磨损、磨粒磨损和腐蚀磨损。通过对比发现Ag-N和Cu-N共渗处理可有效提高不锈钢基材的抗粘着磨损能力。(4)Ag-N复合共渗层对金黄色葡萄球菌的抗菌率均达到100%,经Cu-N共渗处理后的试样S1和S2的抗菌性可达98.5%和99.8%。通过对比发现Ag-N和Cu-N共渗均使得不锈钢表现出良好的抗菌性能。
[Abstract]:316 stainless steel has the advantages of low cost, excellent corrosion resistance, good mechanical properties and good biocompatibility. As a biomedical implant material, 316 stainless steel has been widely used in orthodontics, plastic surgery, vascular stent and so on. However, the application of 316 stainless steel in medical and food processing industries is limited because of its low hardness, easy adhesion, poor wear resistance and little antibacterial property. Therefore, it is urgent to solve the problem of keeping good corrosion resistance of stainless steel and improving hardness and wear resistance of stainless steel and endowing good antibacterial property of stainless steel. In this paper, the plasma treatment technology based on active screen ion nitriding technology is used, that is, pure silver or copper plate is used as the top cover of stainless steel active screen, and the Ag-N and Cu-N composite co-infiltration layer is prepared on the surface of stainless steel. The microstructure, hardness, corrosion resistance, friction and wear properties and antibacterial properties of the samples treated with Ag-N and Cu-N were studied. The main results are as follows: (1) the surface of 316 austenitic stainless steel was prepared by modified ASPN technique. Homogeneous and dense Ag-N or CuN composite co-infiltrating layer composed of Ag or Cu doped S phase nanostructure and S phase diffusion layer was prepared on the surface of 316 austenitic stainless steel. The total thickness of the coating is about 12.0 渭 m, in which the total thickness of the deposit layer is 0.6 渭 m.Cu-N, the total thickness of the deposit layer is 12.0 渭 m, and the thickness of the deposit layer is 2.0 渭 m 路m ~ (-2). The surface hardness is significantly higher than that of stainless steel matrix. The surface hardness of the Ag-N and Cu-N co-infiltrating layer can be increased to 1259 HV0.05 and 1300 HV0.05 respectively, which is 3-4 times of the stainless steel substrate hardness.) under dry friction condition, the wear mechanism of the Ag-N and Cu-N co-infiltrating layers and the stainless steel substrates are both adhesive wear and abrasive wear. In artificial simulated body fluid, the wear mechanisms of Ag-N and Cu-N co-permeation layer and stainless steel substrate are adhesive wear, abrasive wear and corrosion wear. It was found that Ag-N and Cu-N co-permeation treatment could effectively improve the adhesive wear resistance of stainless steel substrate. The antibacterial rate of Ag-N composite layer against Staphylococcus aureus was 100. The antibacterial properties of S _ 1 and S _ 2 treated by Cu-N were 98.5% and 99.8% respectively. It was found that both Ag-N and Cu-N co-infiltration made stainless steel exhibit good antibacterial properties.
【学位授予单位】：太原理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TG174.4

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