Influence of dovetail microstructures on adhesive tensile strength and morphology of thermally sprayed metal coatings
Influence of dovetail microstructures on adhesive tensile strength and morphology of thermally sprayed metal coatings
复制标题
燕尾形微观结构对热喷涂金属涂层粘合拉伸强度和形貌的影响
DOI：
10.1016/j.procir.2018.05.024
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发表时间：
2018
期刊：
影响因子：
--
通讯作者：
Lampke
中科院分区：
文献类型：
--
作者：
Liborius;Paczkowski;Nestler;Schubert;Lampke
一种用于减少乘用汽车的重量和燃料消耗的方法在于用铝合金代替灰铸铁作为内燃机缸体的基础材料。考虑到这些合金对燃料及其添加剂的耐化学性不足，使用具有热喷涂涂层的材料化合物作为气缸衬套。对于机械加工和使用中，要求基底和涂层之间的高连接强度。这可以通过基材表面的预定微结构化来实现，以获得与涂层的局部形状配合。但是，微结构化表面也影响层的局部形态。提高连接强度的另一种可能性是在基材和涂层之间涂敷底漆。对于基础研究，使用CVD金刚石刀头通过端面车削加工不同螺距（200 µm - 500 µm）的螺旋燕尾形微结构。基材由铝合金EN AW-5754组成，其微结构化表面涂覆有镍铝层。厚度约为200 µm的涂层通过高速电弧喷涂产生。该材料通常用作基材和铁基涂层之间的底漆。利用扫描电镜和三维激光扫描显微镜对涂层的微观组织和形貌进行了分析。为了确定涂层的结合强度，进行了拉伸结合强度试验，结果表明，单位长度上结构元素的数目越多，涂层的拉伸结合强度、硬度和氧化物比例越大。拉伸结合强度试验揭示了基体与涂层复合材料的失效机理与基体微观结构的关系。
An approach for a reduction of weight and fuel consumption of passenger cars consists in a replacement of grey cast iron by aluminium alloys as base material of combustion engine blocks. Regarding the insufficient chemical resistance of these alloys to the fuels with its additives, material compounds with thermally sprayed coatings are used as cylinder linings. For machining and in service a high connection strength between the substrate and the coating is demanded. This can be gained by a predefined microstructuring of the substrate surface to attain a local form fit with the coating. But, the microstructured surface also influences the local morphology of the layer. Another possibility to improve the connection strength is the application of a primer between the substrate and the coating.For basic investigations, spiral dovetail microstructures with different pitches (200 µm – 500 µm) are machined by face turning using tools with CVD diamond tippings. The substrates consist of the aluminium alloy EN AW-5754 and their microstructured surfaces are coated with a nickel-aluminium layer. The coating with a thickness of about 200 µm is produced by high-velocity arc spraying. The material is usually used as a primer between the substrate and an iron-based coating. The substrate microstructures and the morphology of the coatings are analysed by SEM and 3D laser scanning microscopy. To determine the adhesive tensile strength of the coating tensile adhesion strength tests are performed.The results show that a higher number of structure elements per length increase the tensile adhesion strength, the hardness and the oxide proportion of the coating. Furthermore, tensile adhesion strength tests reveal failure mechanisms of the compound of substrate and coating depending on the substrate microstructure.
Zylinderkurbelgehäusen 的等离子放电和在 Honen 期间的负载
DOI：
--
发表时间：
2001
期刊：
影响因子：
--
作者：
G. Barbezat;J. Schmid
通讯作者：
J. Schmid
DOI：
--
发表时间：
2008
期刊：
Production Engineering
影响因子：
--
作者：
H. Hoffmeister;C. Schnell
通讯作者：
C. Schnell
影响因子：
5.4
作者：
Bobzin, K.;Ernst, F.;Flores, G.
通讯作者：
Flores, G.