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利用发射光谱(Optical emission spectroscopy,OES)对感应耦合等离子体增强化学气相沉积(Inductivelycoupled plasma enhance chemical vapor d印osition,ICPECVD)类金刚石(Diamondlike carbon,DLC)膜过程中的各种基团进行分析,并对不同条件下薄膜沉积速率以及薄膜显微硬度进行测试.分析结果发现,感应耦合等离子体源激发甲烷等离子体中存在比较突出的碳氢离子成分,从而促进形成高硬度的DLC膜.而且射频功率、沉积气压等沉积参数的变化对DLC薄膜沉积过程的中性基团、离子基团以及原子氢等成分都有着明显影响,从而最终影响薄膜沉积过程及薄膜性质. 相似文献
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Using a one-dimensional fluid model, the pulse-modulated radio-frequency dielectric barrier discharge in atmospheric helium is described. The influences of the pulse duty cycle on the discharge characteristics are studied. The numerical results show that the dependence of discharge characteristics on the duty cycle is sensitive in the region of around 40% duty cycle under the given simulation parameters. In the case of a larger duty cycle, the plasma density is higher, the discharge becomes more intense, but the power consumption is higher. When the duty cycle is lower, one can get a weaker discharge, lower plasma density and higher electron temperature in the bulk plasma. In practical applications, in order to get a higher plasma density and a lower power consumption, it is more important to choose a suitable duty cycle to modulate the RF power supply. 相似文献
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The tuned substrate self-bias in a radio-frequency inductively coupled plasma is controlled by varying the impedance of an external tuning LCR (inductor, capacitor and resistor) network inserted between the substrate and the ground. In experiments, it was found that the variation of the tuned substrate self-bias with the tuning capacitance demonstrated three features, namely, continuity, instability and bistability. In this paper, a numerical study is focused on the elucidation of the physical mechanisms underlying continuity and bistability. For the sake of simplicity and feasibility to include the key factors influencing the tuned substrate bias, the tedious calculation of inductive-coupling to obtain the plasma density axtd electron temperature is omitted, and discussion of the tuned substrate self-bias is made under the prescribed plasma density and electron temperature. On the other hand, the parameters influencing capacitive- coupling are retained in modeling the system with an equivalent circuit. It is found that multi-stable state appears when one of the parameters, such as the resistance in LCR, substrate area and plasma density, decreased to its critical value, or the rf voltage or electron temperature increased to the critical value individually. In the reverse cases, the tuned substrate self-bias varies continuously with the tuning capacitance. 相似文献
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1. IntroductionRadio-frequency (rf) capacitively-coupled plasma(CCP) source has been successfully used in manyfields such as film deposition, etching, surfaCe modification. However, one of the disadvantages of thisplasma discharge is the lack of independent control over plasma generation and bombarding energy of ion upon the processed materials surface [1].To achieve independent control over the above twoprocesses) researchers have put forth different techniques. A variable inductor was plac… 相似文献
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用微波等离子体化学气相沉积(MWPCVD)制备金刚石薄膜涂层之前,采用盐酸、硝酸化学腐蚀和氢-氧等离子体对WC-Co硬质合金(YG6)基体表面进行去钴预处理。扫描电子显微镜形貌观察和X射线衍射谱分析都表明,与化学腐蚀方法相比,氢-氧等离子体处理具有独特的表面去钴效果,沉积金刚石薄膜的喇曼谱分析更证实其对涂层质量的改善,且对MWPCVD过程而言有其技术上的一些优越性。 相似文献
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采用电子回旋共振等离子体化学气相沉积(ECR-PECVD)技术制备了Si3N4薄膜。利用显微硬度计测定了Si3N4薄膜的表面微硬度。由摩擦测试机对SiN4薄膜的摩擦性能进行了测试分析。结果表明,Si3N4薄膜的摩擦系数和单位时间的磨损量较小,该膜具有良好的耐磨性和耐划伤能力。 相似文献
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柔性管理对科研项目管理具有特殊意义。在知识经济时代,企业间的竞争越来越依赖于信息技术,项目的柔性管理正在走向信息化。对科研项目进行柔性管理要立足于科研项目管理的自身新特点。分析了信息技术与科研项目柔性管理的互动关系,提出了应用信息技术手段提高科研项目柔性管理水平的策略。 相似文献