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首页> 外文期刊>Journal of biomedical materials research. Part B, Applied biomaterials. >Adhesion of new bioactive glass coating.
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Adhesion of new bioactive glass coating.

机译：新型生物活性玻璃涂层的附着力。

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摘要

A valuable alternative to the existing biomedical implant coatings is a bioactive glass (BAG) coating that is produced by reactive plasma spraying. A mechanical performance requirement that is of the utmost importance is the adhesion strength of the coating. Considering the application as dental implant, a new adhesion test (shear test), which was close to the service conditions, was designed. A Ti6Al4V rod (3 mm) with a sprayed BAG coating of 50 &mgr;m was glued with an epoxy glue to a hollow cylindrical counterpart and was used as such in the tensile machine. This test was evaluated by finite element analysis (FEA). Preliminary experiments showed that a conversion from shear to tensile adhesion strength is possible by using the Von Mises criterion (sigma = 3(1/2)tau), indicating that thin coatings of brittle materials can behave as a ductile material. The new coating technique was proved to produce a high quality coating with an adhesion strength of 40.1 +/- 4.8 MPa in shear and 69.4 +/- 8.4 MPa in tension. The FEA revealed that no one homogeneously distributed shear stress is present but several nonhomogeneously distributed stress components (shear and tensile) are present in the coating. This analysis indicated that real service conditions are much more complicated than standard adhesion tests. Copyright 1999 John Wiley & Sons, Inc.
机译：现有生物医学植入物涂层的一种有价值的替代方法是通过反应性等离子喷涂生产的生物活性玻璃（BAG）涂层。最重要的机械性能要求是涂层的粘合强度。考虑到牙科植入物的应用，设计了一种新的附着力测试（剪切测试），该测试接近使用条件。将具有50μm的喷涂的BAG涂层的Ti 6 Al 4 V棒（3mm）用环氧树脂胶粘到空心圆柱体对应物上，并原样用于拉伸机中。该测试通过有限元分析（FEA）进行评估。初步实验表明，通过使用冯·米塞斯（Von Mises）准则（西格玛= 3（1/2）tau），可以将剪切强度转变为拉伸粘合强度，这表明脆性材料的薄涂层可以充当韧性材料。新的涂层技术被证明可以生产出高质量的涂层，其剪切强度为40.1 +/- 4.8 MPa，拉伸强度为69.4 +/- 8.4 MPa。有限元分析表明，涂层中不存在均匀分布的切应力，而涂层中存在几种非均匀分布的应力分量（剪切应力和拉伸应力）。该分析表明，实际使用条件比标准附着力测试要复杂得多。版权所有1999 John Wiley＆Sons，Inc.

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