Fatigue reliability guarantee of the interface toughening. Super surface modified material.

在本研究中，我们发明了一种界面转动牢固、磨损系数极低、薄膜厚度极厚的超级DLC薄膜。并进行了为期3年的示范性基础研究，建立了适合DLC膜疲劳可靠性评价的寿命加速试验方法。本研究的目的是使DLC膜与衬底界面增韧的复杂表面织构和疲劳可靠性这两种矛盾特性在高维上得以兼容。对以下三个问题进行了知识的系统整理。(1)超级DLC膜发明工艺的构建；构建了优化处理工艺，实现了DLC膜的超低摩擦系数和超厚膜。(2)优化界面增韧、粘接强化结构及处理工艺的系统化；通过优化微观结构的控制，系统地实现了复合过程的界面增韧和粘接强化。(3)疲劳可靠性保障体系的构建；基于加速试验方法，通过对超长寿命区域产品安全保障知识的系统梳理，构建了包括超级DLC膜材发明在内的一致性可靠性保障体系。经过三年的研究，所得结果如下：(1)对经DLC涂层改善摩擦性能的Al-Si烧结合金进行了疲劳可靠性评价。与未加工材料相比，DLC覆盖材料的疲劳强度有所提高。这是因为导电DLC涂层提高了Si颗粒与衬底之间的界面强度。(2)研究了高速工具钢SKH-51复合DLC涂层处理对疲劳强度的影响。在对工具钢进行表面改造处理时，不仅要注意表面性能的改善，而且要注意热历史残余应力的改善。少

In this research, the super DLC film which turns an interface toughly and has a very low wear coefficient and a very thick film was invented. And, the demonstrative basic research for 3 years was carried out on the construction of life accelerated test method which can appropriately evaluate fatigue reliability of a DLC film. The purpose of this study is that contradictory characteristics that is complicated surface texture and fatigue reliability with the interface toughening between DLC film and backing are compatible in the high dimension. The systematic arrangement of a knowledge was carried out on three problems of the following. (1) Construction of the super DLC film invention process ; Optimized treating process which realizes ultra low friction coefficient and super thick film of a DLC film is constructed. (2) Optimization of the interface toughening, the adhesive strengthening structure and the systematization of the treating process ; Control of the optimal micro structure an … More d a composite-ized process are systematized systematically to realize the interface toughening and the adhesive strengthening. (3) Construction of the fatigue reliability guarantee system ; Based on the accelerated test method, consistent reliability assurance system including the invention of the super DLC film material is constructed by systematically arranging a knowledge on product safety guarantee in the very long life region.The result obtained by this study for three years is as follows. (1)Fatigue reliability evaluation of the Al-Si sintered alloy which improved the frictional property by conducting DLC coating was carried out. The fatigue strength of DLC covering material was improved in comparison with unprocessed material. This is because that the interface strength between Si particle and backing is improved by conducting the DLC coating. (2)The effect of Hybrid DLC coat processing conducted to high speed tool steel SKH-51 on the fatigue strength was examined. It is necessary to pay the sufficient attention in not only improvement in the surface function but also heat history residual stress, when the surface reforming processing is conducted to the tool steel. Less