医用Mg-Zn-Gd合金微观结构与腐蚀产物分析

发布时间：2018-12-11 10:58

【摘要】：背景:镁合金作为金属内固定材料,具有可降解的独特优势,且弹性模量与密质骨相近,可避免"应力遮挡"效应,但对于骨折内固定材料,生物活性代表着在体内与骨的键合能力,对其研究具有重要意义。目的:观察Mg-Zn-Gd合金的微观结构以及在模拟体液中腐蚀产物的形貌和微区分析。方法:利用熔铸合金化法制备Mg-Zn-Gd合金,扫描电子显微镜观察合金的微观组织形貌,能谱仪对微区成分和析出相进行分析。结果与结论:Mg-Zn-Gd铸态合金由含有Gd和Zn元素的过饱和α-Mg固溶体和共晶组织组成,共晶组织为羽毛状、椭圆状、鱼骨状及沿晶界分布的条状物,共晶组织主要成分为Mg、Zn和Gd;将Mg-Zn-Gd合金在Hank’s溶液中浸泡72 h后,表面沉积含有O,Mg,Ca,P元素的膜层,经XRD衍射分析,表面膜层中含有Mg(OH)_2相,该相促进含Ca盐的沉积,初步证明了镁合金具有良好的生物活性。
[Abstract]:Background: magnesium alloy, as a metal internal fixation material, has a unique advantage of degradability, and its modulus of elasticity is similar to that of dense bone, which can avoid "stress shielding" effect, but for fracture internal fixation materials. Biological activity represents the ability to bond with bone in vivo, so it is of great significance to study it. Aim: to observe the microstructure of Mg-Zn-Gd alloy and the morphology and microanalysis of corrosion products in simulated body fluid. Methods: Mg-Zn-Gd alloy was prepared by melting casting alloying method. The microstructure of the alloy was observed by scanning electron microscope (SEM). The composition and precipitated phase of the alloy were analyzed by energy dispersive spectrometer (EDS). Results and conclusion: the as-cast Mg-Zn-Gd alloy consists of supersaturated 伪 -Mg solid solution and eutectic structure containing Gd and Zn elements. The eutectic structure is feathered, ellipsoid, fishbone and stripe distributed along grain boundaries. The main components of eutectic structure are Mg,Zn and Gd;. After immersion of Mg-Zn-Gd alloy in Hank's solution for 72 h, the surface of Mg-Zn-Gd alloy was deposited with OMg-CaOP element. By XRD diffraction analysis, Mg (OH) _ 2 phase was found on the surface film layer, which promoted the deposition of Ca containing salt. It is preliminarily proved that magnesium alloy has good biological activity.
【作者单位】：天津市东丽区东丽医院;黑龙江科技大学材料科学与工程学院;吉林大学白求恩医学院;
【基金】：天津市卫生局项目(2011KZ70)~~
【分类号】：R318.08;R68

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