| 1 | Systematic Study of Nanocrystalline Plasma Electrolytic Nitrocarburising of 316L Austenitic Stainless Steel for Corrosion Protection显示文摘很多研究在 nanocrystalline 血浆的使用上被报导了为表面为更高的腐蚀抵抗不锈钢变硬的电解 nitrocarburising 技术源于这种技术。然而,很少的研究在 nanocrystalline 血浆的优化上集中了电解 nitrocarburising 过程参数。在这研究,实验(雌动物)的一个图案技术, Taguchi 方法,被用来优化 thenanocrystalline 血浆不仅为表面变硬而且为 316L 的腐蚀保护的电解 nitrocarburising 由控制涂层 process'sfactors.The 的奥氏体的不锈钢试验性的设计由四个因素(过程的脲集中,电解质的电的电导率,电压和持续时间)组成了,每包含的 threelevels.Potentiodynamic 极化测量被执行决定涂的样品的腐蚀电阻。结果用相关软件被分析。signal-to-noise (S/N ) 的平均数的分析比率显示 nanocrystallineplasma 的腐蚀电阻电解 nitrocarburised 316L 不锈钢被层次在 Taguchi 直角的数组显著地影响。为腐蚀电阻的优化涂层参数是为脲集中的 1150g/L,为电解质的电的电导率的 360 mS/cm,为应用电压的 260 V,在处理时间的 6 min。为每个因素的贡献的百分比被变化(ANOVA ) 的分析决定。结果证明应用电压是影响涂层的腐蚀电阻的最重要的因素。 | M.Aliofkhazraei P.Taheri A.Sabour Rouhaghdam Ch.Dehghanian | 2007 | Journal of Materials Science & Technology2007，23，5： | 3 |
| 2 | Extrusion-based additive manufacturing of Mg-Zn alloy scaffolds显示文摘Porous biodegradable Mg and its alloys are considered to have a great potential to serve as ideal bone substitutes.The recent progress in additive manufacturing(AM) has prompted its application to fabricate Mg scaffolds with geometrically ordered porous structures.Extrusionbased AM,followed by debinding and sintering,has been recently demonstrated as a powerful approach to fabricating such Mg scaffolds,which can avoid some crucial problems encountered when applying powder bed fusion AM techniques.However,such pure Mg scaffolds exhibit a too high rate of in vitro biodegradation.In the present research,alloying through a pre-alloyed Mg-Zn powder was ultilized to enhance the corrosion resistance and mechanical properties of AM geometrically ordered Mg-Zn scaffolds simultaneously.The in vitro biodegradation behavior,mechanical properties,and electrochemical response of the fabricated Mg-Zn scaffolds were evaluated.Moreover,the response of preosteoblasts to these scaffolds was systematically evaluated and compared with their response to pure Mg scaffolds.The Mg-Zn scaffolds with a porosity of 50.3% and strut density of 93.1% were composed of the Mg matrix and MgZn2second phase particles.The in vitro biodegradation rate of the Mg-Zn scaffolds decreased by 81% at day 1,as compared to pure Mg scaffolds.Over 28 days of static immersion in modified simulated body fluid,the corrosion rate of the Mg-Zn scaffolds decreased from 2.3± 0.9 mm/y to 0.7±0.1 mm/y.The yield strength and Young’s modulus of the Mg-Zn scaffolds were about 3 times as high as those of pure Mg scaffolds and remained within the range of those of trabecular bone throughout the biodegradation tests.Indirect culture of MC3T3-E1 preosteoblasts in Mg-Zn extracts indicated favorable cytocompatibility.In direct cell culture,some cells could spread and form filopodia on the surface of the Mg-Zn scaffolds.Overall,this study demonstrates the great potential of the extrusion-based AM Mg-Zn scaffolds to be further developed as biodegradable bone-substituting biomaterials. | J.Dong N.Tümer M.A.Leeflang P.Taheri L.E.Fratila-Apachitei J.M.C.Mol A.A.Zadpoor J.Zhou | 2022 | Journal of Magnesium and Alloys2022，10，9： | 2 |
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