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磁控溅射Ti靶镀料热发射脱靶的机理研究
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西安理工大学 材料科学与工程学院

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国家自然科学基金资助(项目号52001251)


Study on Mechanism of Thermal Emission of Plating Particles in Magnetron Sputtering Ion Plating with Ti Target
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1.Xi''an University of technology,School of Materials Science and Engineering,Xi’an 710048;2.China

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    摘要:

    高功率脉冲磁控溅射技术虽能实现提高镀料离化率以增强镀层力学性能的设计初衷,但其极低的沉积速率降低了工作效率,阻碍了该技术产业化的成功推广。因此,期望在达到镀料高离化率的同时,兼顾高速沉积是本研究的主要目的,为此本文提出一种创新性的研究思路,利用自主研发的双级脉冲电场,通过分别调控两个脉冲阶段的电场参量引发阴极靶面气体放电由辉光向弧光转变,借助弧光放电产生的高密度等离子体,增强靶面氩离子的碰撞动能和金属靶材产生的焦耳热,诱发镀料以高离化率、高产额的热发射方式脱离靶材。实验结果表明:在持续提高铜靶和钛靶的靶电流密度时,阴极靶材与阳极腔体间的伏安特性会由正比例的递增关系转变为反比例的递减关系,这说明气体放电会由辉光放电向弧光放电转变,并以此诱发镀料由碰撞溅射脱靶转变为溅射+热发射脱靶。实验以钛靶作为研究对象,采用双级脉冲电场在提高钛靶电流密度时,靶面形貌由具有阶梯状直线条纹的多边形凹坑结构转变为具有直线条纹的多边形凹坑和水流波纹状的圆形凹坑的混合结构,说明此时靶面镀料的脱靶方式除典型的碰撞溅射外,已逐渐向碰撞溅射加热发射双重脱靶方式转变,镀层的沉积速率也由6 nm/min大幅增大至26 nm/min。

    Abstract:

    High power pulsed magnetron sputtering technology can increase the ionization rate of the sputtering particles to enhance the mechanical properties of the film, but the loss of deposition rate has seriously affected the industrialization of this technology. The main purpose of this study is to achieve the functional goal of increasing the ionization rate of the sputtering particles and taking into account the high efficiency goal of the deposition rate. The gas discharge above the cathodic target surface is changed from glow to arc through the adjustment of the electric field parameters using a new type of dual-stage pulsed electric field. The high-density plasma generated by arc discharge enhances the impact kinetic energy of Ar+ and the accumulation of Joule heating on the target surface, and induces the target material to escape from target surface in a thermal emission mode with high ionization rate and high yield. The results showed that when the target current density of the Cu target and the Ti target increased, the volt-ampere characteristics between the cathodic target and the anodic vacuum chamber changed from a proportional to an inverse relationship, indicating that the gas discharge changed from glow to arc, and the escape-target mode of target materials could be transformed into a thermal emission mode. When the dual-stage pulsed electric field was used to induce arc discharge, the morphology of the Ti target surface changed from a polygonal pit structure with linear stripes to a large-area pit structure with linear stripes and ripple structure. It is indicated that the target material escaped from the target surface by sputtering and thermal emission, and the deposition rate of the Ti film had significantly increased from 6 nm/min to 26 nm/min.

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杨超,郝娟,蒋百灵,王戎.磁控溅射Ti靶镀料热发射脱靶的机理研究[J].稀有金属材料与工程,2022,51(9):3276~3281.[Yang Chao, Hao Juan, Jiang Bailing, Wang Rong. Study on Mechanism of Thermal Emission of Plating Particles in Magnetron Sputtering Ion Plating with Ti Target[J]. Rare Metal Materials and Engineering,2022,51(9):3276~3281.]
DOI:10.12442/j. issn.1002-185X.20210714

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  • 收稿日期:2021-08-12
  • 最后修改日期:2021-10-09
  • 录用日期:2021-10-27
  • 在线发布日期: 2022-10-08
  • 出版日期: 2022-09-27