【作者】 解志文；

【导师】 王浪平；

【作者基本信息】 哈尔滨工业大学 ， 材料加工工程， 2007， 硕士

【摘要】 本研究采用等离子体浸没离子注入与沉积(PIIID)技术在GCr15钢和2Cr13钢表面制备了Ti/DLC和W/DLC纳米多层薄膜,DLC、Ti和W层均通过PIIID技术中的阴极弧沉积方法来制备。实验过程中所有纳米多层膜的总厚度均为1.5μm,其调制周期从50nm增加到400nm。对制备的纳米多层膜进行了扫描电镜(SEM)、X射线衍射(XRD)、显微硬度、摩擦磨损、划痕和电化学腐蚀测试。SEM测试结果表明:纳米多层膜具有完整、清晰的调制层结构,但膜层界面处较模糊,存在成分的过渡层,这主要是由于PIIID过程中的离子注入的混合效应造成的。XRD测试结果表明这种方法制备的纳米多层膜均为非晶态薄膜。显微硬度测试结果表明:Ti/DLC和W/DLC纳米多层薄膜分别在小调制周期时显微硬度最低,在较大调制周期时的显微硬度最高。划痕试验表明:纳米多层薄膜均不同程度的改善了DLC膜和基体的结合力,不同调制周期薄膜的破裂方式明显不同,说明不同膜层的内应力差异很大。摩擦磨损实验结果表明:Ti/DLC和W/DLC纳米多层薄膜分别在小调制周期时摩擦磨损性能较好,其摩擦系数在磨擦10000转后保持稳定,而2Cr13钢基体上制备的DLC单层薄膜在摩擦2000转后摩擦系数就逐渐上升,从综合性能的表现看:纳米多层薄膜既保持了类金刚石(DLC)薄膜低摩擦系数的特性,又改善薄膜和基体的结合力。腐蚀实验表明:纳米多层膜均不同程度的提高了GCr15基体表面的腐蚀电位,Ti/DLC纳米多层膜较基体提升最高达19.4%,W/DLC纳米多层薄膜较基体提升最高达32.6%。Ti/DLC纳米多层膜对2Cr13钢基体表面的耐腐蚀性能没有明显的提高,W/DLC纳米多层膜在调制周期为200nm、300nm、400nm均不同程度的提高了2Cr13钢基体表面的耐腐蚀性能。更多还原

【Abstract】 Using plasma immersion ion implantation and deposition (PIIID), Ti/DLC and W/DLC multilayer were synthesized on GCr15 and 2Cr13 steel. Diamond-like carbon (DLC), titanium, tungsten layers were synthesized by the pulsed cathodic arc plasma source in our PIIID facility. All multilayers have the same thickness of approximately 1.5μm, but its modulation period is varied from 50 to 400nm.The films were characterized by scanning electron microscopy (SEM), x-ray diffraction (XRD), micro-hardness, scratch and electrochemistry corrosion tests. The SEM result indicates that the as-synthesized multilayer has a good periodicity structure. However, the interface between neighbor layers is vague, which can be attribute to the effect of ion implantation. XRD results show that the Ti/DLC and W/DLC multilayers are both amorphous structures. The micro-hardness testing results reveal that the maximum micro-hardness of Ti/DLC and W/DLC multilayers lies at a large specific period. The minimal microhardness of Ti/DLC and W/DLC multilayers lies at a small specific period. Scratch test results show that the multilayer sturcture can improve the adhesion strength between the substrate and the surface modification layer. However, since the flake behavior of different multilayers is different, different multialyers should have different stress distribution. The tribological results show that Ti/DLC and W/DLC multilayers have a high wear resistance at a small specific period. The cut-through number of the Ti/DLC and W/DLC multilayers on 2Cr13 substrate exceeds 10000 r, whereas that of the single DLC film on 2Cr13 substrate is about 2000 r. It can be concluded that the multilayer not only maintains the low coefficient characteristic of the single DLC film, but also improves adhesion strength between the surface modification layer and the substrate. The electrochemistry testing results exhibit that the corrosion voltage of the GCr15 steel is increased by the multilayers. The maximum corrosion voltage of Ti/DLC and W/DLC multilayers have increased by 19.4 percent and 32.6 percent, respectively. For 2Cr13 steel, the corrosion resistant of the W/DLC multilayer at the specific period of 200nm 300nm and 400nm is improved slightly, whereas that of the Ti/DLC structure has nearly the same corrosion resistance of the substrate.更多还原