Martinho R P, Silva F J G, Alexandre R J D, Baptista A P M
Departamento de Engenharia da Escola Superior de Estudos Industriais e de Gestão do Instituto Politécnico do Porto, Rua D. Sancho I, 981, 4480-876 Vila do Conde, Portugal.
J Nanosci Nanotechnol. 2011 Jun;11(6):5374-82. doi: 10.1166/jnn.2011.3772.
In the injection moulding of polypropylene reinforced with hard glass fibres, die materials are commonly subjected to severe abrasive wear. In order to improve its wear resistance, an unbalanced magnetron sputtering PVD compositional monolayered coating has been produced. The film was composed by a nanostructured TiB2 monolayer. Microstructure characterization and thickness evaluation were conducted by scanning electron microscopy (SEM). Film topography and roughness were accessed by SEM and Atomic Force Microscopy (AFM). The phase analyse was investigated by X-ray diffraction (XRD), using Cu Kalpha radiation. Scratch tests were conducted in order to study the film adhesion to the substrate. Load-Displacement curves (nanoindentation analysis) allowed measuring the film hardness and Young's modulus. A ball-cratering tribometer was used to determine the micro-abrasion laboratorial wear resistance, under different tests conditions, using SiC particles in distilled water slurry. At the end of these tests, the worn surfaces were analyzed by SEM and Energy Dispersive X-ray Spectroscopy (EDS) in order to compare these results with some other coatings already tested in the same conditions. To test the practical wear resistance, 135000 injection cycles were done in a plastic injection industrial mould. Coated samples were put on the plastic feed canal, after a turbulent zone. In these tests, a 30% (wt) glass fibres reinforced polypropylene was used. Worn sample surfaces were analyzed by SEM after 45.000 and 90.000 cycles. Image analyses were made in order to evaluate the damage increases and to observe the wear mechanisms involved.
在采用硬玻璃纤维增强聚丙烯的注塑成型过程中，模具材料通常会遭受严重的磨粒磨损。为提高其耐磨性，制备了一种非平衡磁控溅射物理气相沉积（PVD）成分单层涂层。该薄膜由纳米结构的TiB₂单层组成。通过扫描电子显微镜（SEM）进行微观结构表征和厚度评估。通过SEM和原子力显微镜（AFM）获取薄膜形貌和粗糙度。使用Cu Kα辐射通过X射线衍射（XRD）进行相分析。进行划痕试验以研究薄膜与基体的附着力。载荷 - 位移曲线（纳米压痕分析）用于测量薄膜硬度和杨氏模量。使用球坑式摩擦磨损试验机，在不同试验条件下，于蒸馏水浆料中使用SiC颗粒来测定微观磨粒磨损的实验室耐磨性。在这些试验结束时，通过SEM和能量色散X射线光谱仪（EDS）对磨损表面进行分析，以便将这些结果与在相同条件下已测试的其他一些涂层进行比较。为测试实际耐磨性，在塑料注塑工业模具中进行了135000次注塑循环。将涂层样品放置在塑料进料通道中湍流区之后的位置。在这些试验中，使用了30%（重量）玻璃纤维增强聚丙烯。在45000次和90000次循环后，通过SEM对磨损样品表面进行分析。进行图像分析以评估损伤增加情况并观察所涉及的磨损机制。
