共查询到19条相似文献,搜索用时 703 毫秒
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两步压入法--薄膜力学性能的可靠测量方法 总被引:17,自引:2,他引:17
提出了采用力学探针测量薄膜力学性能的两步压入法.该方法通过大载荷压入展示基体变形对薄膜硬度的影响,从而选择不影响基体变形的小载荷测出薄膜的硬度和弹性模量.对高速钢基片上的TiN硬质薄膜,单晶硅片上的金属Ni薄膜和(Ti,Al)N/VN纳米多层膜的测量表明,两步压入法能够测出各种性质薄膜的力学性能,并且具有准确可靠的特点.此外,两步法对(Ti,Al)N/VN纳米多层膜的力学性能的测量表明,该体系的纳米多层膜存在硬度和弹性模量异常升高的超硬、超模量效应. 相似文献
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利用量纲定理和有限元法系统分析了残余压应力场中薄膜硬度的变化规律,在此基础上提出了薄膜硬度的修正公式.该修正公式把有、无残余应力时的薄膜硬度比值Hr/H0、卸载功和压入总功的比值We/W、残余压应力σr和硬度的比值σr/Hr联系起来,据此,只要测定薄膜纳米压入加、卸载曲线及薄膜中的残余压应力,便可最终确定无残余应力时的薄膜硬度. 相似文献
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为了研究薄膜厚度对Si基SiO_2薄膜力学性能的影响规律,利用纳米压痕技术及有限元模拟方法对不同厚度的Si基SiO_2薄膜材料进行测试,分析了不同厚度薄膜的硬度及弹性模量等力学性能,讨论了不同压深膜厚比对不同厚度薄膜弹性恢复率的影响,并在试验的基础上,建立了有限元模型,模拟了不同厚度薄膜在相同压深下的载荷位移关系,分析了薄膜的弹性恢复性能。结果表明:SiO_2薄膜越厚其弹性模量越小,而薄膜的硬度在薄膜较薄时压痕的尺寸效应更明显,并利用模拟进一步分析得出薄膜越薄弹性恢复性能越好。 相似文献
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纳米压痕仪被称为材料机械性质微探针,它借助于加载-卸载过程中压痕对载荷和压入深度的敏感关系,使得测试始终在薄膜材料的弹性限度内,克服了维氏法和努氏法等传统方法引起压痕边缘模糊或者碎裂的缺点,从而正确地、可靠地测试出薄膜材料的硬度和弹性模量等纳米力学性能.试验用微波电子回旋共振等离子体增强化学气相沉积技术,在不同偏压条件下制备三种类金刚石薄膜(DLC膜),用纳米压痕仪测试不同载荷下薄膜的硬度和弹性模量值.试验结果表明,材料的纳米硬度和弹性模量随着载荷的增大而逐渐减小. 相似文献
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以N(111) 型的单晶硅片为基体,运用PECVD-2D等离子体化学气相淀积台在单晶硅片表面沉积氮化硅薄膜,通过薄膜颜色与厚度间的关系探讨了制备工艺参数对薄膜厚度的影响,用原位纳米力学测试系统对氮化硅薄膜的纳米硬度进行测定,在UMT-2型摩擦试验机上对不同制备工艺的硅基氮化硅薄膜进行耐磨寿命试验.结果表明:随着沉积温度的升高,薄膜厚度逐渐递减,SiH4和N2流量比越大,薄膜厚度越大;温度越高,薄膜硬度越大,耐磨寿命越长;随着SiH4和N2流量比的增加,薄膜硬度和耐磨寿命均先增加后减小. 相似文献
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利用电磁力驱动微拉伸装置,考察多晶硅微构件表面粗糙度和施加表面分子自组装膜(octadecyltrichlorosilane,简称OTS)对抗拉强度及断裂损伤的影响。结果表明,微构件的抗拉强度表现出依赖表面性质的表面效应。抗拉强度随表面粗糙度的增加而降低,并受环境气氛的影响。当构件表面施加表面分子自组装膜后,在以上两因素的作用下.多晶硅微构件的抗拉强度提高了32.46%。研究结果可用于微机械构件的材料表面改性设计。 相似文献
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Rwei -Ching Chang Feng -Yuan Chen PaoHsiang Yang 《Journal of Mechanical Science and Technology》2007,21(10):1739-1744
Photo resist thin films have mainly been used and investigated for versatile applications of micro electronic mechanical systems
because of its outstanding aspect ratio and attainable film thickness. An accurate structure properties derived from validated
material characterization is required in engineering applications. In this work, dynamic responses of photo resist thin films
are tested by a nanoindentation in association with a dynamic mechanical analysis, where the thin film is coated on a silicon
wafer by spin coating. The results show that the storage modulus of the photo resist thin film remains constant at the beginning
and then increases as the indentation depth increases. Meanwhile, the loss modulus increases as the indentation depth increases.
Varying the film thickness shows that the substrate effect plays an important role in determining the dynamic properties of
thin films. However, the results agree well with the bulk material when the amplitude of nanoindentation is relatively small.
It illustrates the dynamic mechanical analysis can be an efficient method to characterize the viscoelastic properties of thin
films, but proper attention on the test parameters is needed. 相似文献
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从三元含Mo的Cr-Mo-N、Mo-Si-N、Mo-C-N薄膜到四元Cr-Mo-Si-N、Mo-Si-C-N薄膜,综述多元系列薄膜的结构、力学及摩擦学性能的研究进展;分析在不同气体压力、制备方法与参数、不同元素含量下薄膜结构的变化,阐述薄膜结构与其力学性能和摩擦学特性的关联。指出:多元Cr-Mo-Si-C-N系列薄膜结构、硬度、摩擦因数强烈受到薄膜中Mo、Si、C、N元素含量的影响,其中力学特性还与薄膜微结构紧密相关;薄膜的摩擦学特性与晶粒生长细化和作为润滑剂的无定形基质有关;在摩擦过程中发生的摩擦化学反应也有效地提高了薄膜的耐磨性。对于四元Cr-Mo-C-N和多元Cr-Mo-Si-C-N薄膜,建议进一步研究在水润滑与非润滑的不同条件下,例如在海水或者空气干摩擦环境下,是否由于薄膜结构组分的不同而有效地形成含Mo的氧化物的自润滑膜,以提高薄膜在更多场合下的适应性和减摩性。 相似文献
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单轴微拉伸MEMS材料力学性能测试的系统集成 总被引:1,自引:0,他引:1
为了对微米尺度薄膜材料的力学性能进行测试,开发了一套成本较低的单轴微拉伸MEMS材料力学性能测试系统。首先,根据有限元模拟优化设计测试样片,使其能够易于夹持、准确对中,以利于应力和应变的测量。接着采用三维非硅UV-LIGA微加工技术制备了Ni薄膜样片。根据单轴拉伸测试过程和硬件构成,以Visual Basic为平台编译了一套数据采集与分析系统。最后,应用该测试系统完成对电镀Ni薄膜材料性能的测试。实验结果表明,该系统能够精确测试试样应变,精度达到0.01μm,拉伸力精度达到mN级。得到的电镀Ni薄膜材料的杨氏模量约为94.5 GPa,抗拉强度约为1.76 GPa。该系统基本满足微米尺度材料单轴微拉伸力学性能测试的需要。 相似文献
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0INTRODUCTIONThe miniaturization of microelectronic device is now reaching the mechanical field, allowing the integration of micromechanisms together with their operation electronics in a single device. This leads to interesting perspectives in the design of monolithic microrobtic systems by the micromachining techniques directly derived from standard silicon technology. Scientists have already moved MEMS into various stages of conception and development for making laboratories on chips,… 相似文献
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The present study offers for the first time a correlation between static nanomechanical properties (nanohardness (H), elastic modulus (E), H/E and H
3/E
2 ratio) and dynamic properties (resulting from nanoscratch measurements) for Metal–ZrN thin films (Inconel–ZrN, Cr–ZrN and
Nb–ZrN) as well as monolayer polycrystalline ZrN thin films. Metal–ZrN thin films have a great industrial potential, as they
can combine high hardness with good elasticity and toughness making them effective for wear resistant application. Nanomechanical
and nanotribological properties of Metal–ZrN and ZrN thin films deposited by DC unbalanced magnetron sputtering were investigated
using an atomic force microscope interfaced with a Hysitron Triboscope. The elastic recovery of thin films under a normal
load applied during nanoindentation was evaluated and correlated with elastic recovery of thin films under dynamic loading
during nanoscratch measurements in order to asses which film compositions provide superior wear resistance. It is demonstrated
that dynamic elastic recovery measurements correlated well with those derived from static nanoindentation tests. The nanoscratch
test combines both normal and tangential loading, therefore, it is expected to be an even better predictor of wear-resistance.
The AFM nanoindentation and nanoscratch measurements show superior nanomechanical and nanotribological properties for Metal–ZrN
thin films when compared to polycrystalline ZrN thin films. 相似文献
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The thickness and frictional characteristics of thin lubricant films are known to affect the fuel economy properties of oils. The base oil and polymer compositions of the lubricant are generally considered to be critical chemical factors that can influence these thin‐film lubricant properties in new oils. However, it is important to produce lubricants with good fuel economy properties that are maintained after the lubricant is degraded. Lubricants in use can undergo oxidation and mechanical shear degradation. The effect of oxidation degradation on thin‐film physical properties has previously been studied. This paper investigates the effect of mechanical shearing on thin‐film properties. Dispersant olefin copolymers are found to reduce thin‐film friction in simple mixtures and in fully formulated oils. In simple mixtures, shearing the dispersant olefin copolymers does not affect the friction‐reducing ability of these polymers. In fully formulated oils, even though shearing diminishes to a degree the friction‐reducing ability of dispersant olefin copolymers, these copolymers can still provide significant friction reduction. 相似文献