为了进一步提高超硬TiB2镀层与基体的结合力,采用磁空溅射法在高速钢表面上制备了多层相间的Ti/TiB2超硬镀层.利用多种实验方法测试和研究了镀层的组织结构,形貌,表面粗糙度,硬度和与基体的结合力.结果表明,镀层的Ti/TiB2相间层数对这些性能有很大的影响.当层数从二逐渐增加到十二,TiB2镀层的(001)织构逐渐消失而变成无择优取向,镀层表面粗糙度增加,但镀层硬度基本不变.只有当层数为十二时,镀层硬度才明显降低.结果也表明,多层镀层可有效地提高镀层与基体的结合力,并存在着一最佳的多层结合.本文也对多层结构对其它组织和性能特征的影响进行了分析.
This study addresses the development of multilayer Ti/TiB2 coatings on high speed steel substrate with the aim to improve the mechanical integrity of the coating-substrate system. Multilayer Ti/TiB2 coatings were deposited on high speed steel (HSS)substrate by magnetron sputtering. The multilayer coating systems were evaluated with respect to hte properties of the coatings such as structure,fractured cross-section, surface roughness, hardness, modulus and coating adhesion. It is found that these properties are significantly affected by the number of alternate Ti/TiB2 layers of the coatings. With increasing number of layers from 2 to 12, the texture of the TiB2 coating changes from (001) to random orientation, the coating surface roughness increases, and the coating hardness remains relatively constant until the number of layers reaches 12, which leads to a significant reduction in coating hardness. More importantly, the adhesion strength of TiB2 coating to HSS substrate can be significantly enhanced in the multilayer system, and by a proper combination of alternate Ti and TiB2 layers, an optimal enhancement in adhesion can be achieved. The effects of alternate layers on other structural and property features of the resultant coatings are also discussed.
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