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微杂质污染一直是影响精密器件制造质量和使用寿命的关键因素之一. 对于微纳米杂质颗粒用传统的清洗方式(超声清洗等)难以去除, 而激光等离子体冲击波具有高压特性, 可以实现纳米量级杂质颗粒的去除, 具有很大的应用潜力. 本文主要研究了激光等离子体去除微纳米颗粒过程中的热力学效应: 实验研究了激光等离子体在不同脉冲数下对Si基底上Al颗粒去除后的颗粒形貌变化, 发现大颗粒会发生破碎而转变成小颗粒, 一些颗粒达到熔点后发生相变形成光滑球体, 这源于等离子体的热力学效应共同作用的结果. 为了研究微粒物态转化过程, 基于冲击波传播理论研究, 得到冲击波压强与温度特性的演化规律; 同时, 利用有限元模拟方式研究激光等离子冲击波压强和温度对微粒作用规律, 得到了颗粒内随时间变化的应力分布和温度分布, 并在此基础上得到等离子体对颗粒的热力学作用机制.Micro-impurity pollution is always one of the key factors affecting the quality and service life of precision devices. Micro-nano impurity particles are difficult to remove by traditional cleaning methods (ultrasonic cleaning, etc.) and low removal efficiency by laser cleaning methods (dry laser cleaning, etc.). The laser plasma shock wave has high pressure and high temperature characteristics, which can remove nano-scaled impurity particles, and has great potential applications. In this work, we mainly study the thermodynamic effect of the laser plasma in the process of removing micro- and nano-particles. In this work, the Al particles on the Si substrate are removed by laser plasma shock wave, and the transformation of the particle state is discussed through the changes of the experimental sample morphology after different pulse effects. The experimental results show as follows With the increase of the pulse number, the micro- and nano-particle residues gradually decrease. At the same time, on the surface of the sample after these particles are removed, it can be found that large particles break up into small particles, and some of the particles will change into smooth spheres when their temperatures reach the melting point. These phenomena are the result of the interaction of the thermodynamic effect of the plasma. In order to study the transformation process of particle state, based on the plasma shock wave propagation theory, the evolution law of pressure characteristic and temperature characteristic of shock wave are obtained. From the evolution law, it can be seen that with the increase of shock wave radius, the pressure and temperature gradually decrease. When the shock wave propagates to the surface of a sample, it can reach the compression threshold and correspondingly the surface temperature arrives at melting temperature of particles, which are consistent with the experimental results. By using the finite element simulation method, the pressure and temperature of laser plasma shock wave acting on particles are studied. The stress distribution and temperature distribution in particles varying with time are obtained. The analysis results are consistent with the experimental results, and therefore the thermodynamic mechanism of plasma on particles is obtained.
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Keywords:
- plasma shock wave /
- particle fragmentation /
- particle phase transition /
- thermodynamic analysis
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图 2 原始样品的SEM图 (a)整体图; (b), (c)局部放大图
Fig. 2. SEM images of original samples: (a) Overall picture; (b), (c) partial enlarged pictures in (a).
图 3 光学显微镜2000倍下不同脉冲数的实验图 (a) 1; (b) 2; (c) 5; (d) 10; (e) 15; (f) 20; (g) 30; (h) 50; (i) 涂有Al颗粒的原始样品
Fig. 3. Experimental pictures of different pulse numbers at 2000 x optical microscope: (a) 1; (b) 2; (c) 5; (d) 10; (e) 15; (f) 20; (g) 30; (h) 50; (i) original sample coated with Al particles.
图 4 不同脉冲下颗粒去除情况的SEM图 (a) 1; (b) 2; (c) 5; (d) 10; (e) 15; (f) 20; (g) 30; (h) 50
Fig. 4. SEM images of particle removal under different pulses: (a) 1; (b) 2; (c) 5; (d) 10; (e) 15; (f) 20; (g) 30; (h) 50.
图 5 颗粒破碎和相变现象的SEM图 (a) 破碎; (b) 破碎的放大图; (c)相变1; (d)相变2
Fig. 5. SEM images of particle fragmentation and melting phenomenon: (a) Fragmentation; (b) the enlargement of fragmentation in (a); (c) phase transition 1; (d) phase transition 2
图 6 冲击波的传播 (a)冲击波波前压强随传播半径的变化; (b) P1为法向压强, P2为切向压强
Fig. 6. Propagation of shock wave: (a) Changes in shock wavefront pressure with transmission radius; (b) P1 is the normal pressure, P2 is the tangential pressure.
图 7 有限元分析-不同时间颗粒内应力分布图 (a) 103 MPa; (b) 743 MPa; (c) 348 MPa; (d) 165 MPa
Fig. 7. Finite element analysis-stress distribution in the particles at different times: (a) 103 MPa; (b) 743 MPa; (c) 348 MPa; (d) 165 MPa.
图 8 冲击波温度随波前传播半径的变化
Fig. 8. Changes in shock wave temperature with wavefront propagation radius.
表 1 Al颗粒和Si基底的相关参数
Table 1. Related parameters of Al particles and silicon substrate.
参数 导热系数/pW·μm–1·K–1 密度/kg·μm–3 比热容/pJ·kg–1·K–1 泊松比 弹性模量/MPa 热膨胀系数 铝 237 × 106 2700 × 10–18 880 × 1012 0.330 70 × 103 23.21 × 10–6 Si 150 × 106 2328 × 10–18 618 × 1012 0.278 190 × 103 0.50 × 10–6 
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[1] Varghese I, Peri M D M, Dunbar T, Maynard B, Thomas D A, Cetinkaya C 2008 J. Adhes. Sci. Technol. 22 651
Google Scholar
[2] Zhang P, Bian B M, Li Z H 2007 Appl. Surf. Sci. 254 1444
Google Scholar
[3] Cetinkaya C, Vanderwood R, Rowell M 2002 J. Adhes. Sci. Technol. 16 1201
Google Scholar
[4] Han J H, Luo L, Zhang Y B, Hu R F, Feng G Y 2016 Chin. Phys. B 25 095204
Google Scholar
[5] Lee J M, Watkins K G 2001 J. Appl. Phys. 89 6496
Google Scholar
[6] Lim H, Jang D, Kim D, Lee J W, Lee J M 2005 J. Appl. Phys. 97 054903
Google Scholar
[7] Vanderwood R, Cetinkaya C 2003 J. Adhes. Sci. Technol. 17 129
Google Scholar
[8] 李晓溪, 贾天卿, 冯东海, 徐至展 2004 物理学报 53 2154
Google Scholar
Li X X, Jia T Q, Feng D H, Xu Z Z 2004 Acta Phys. Sin. 53 2154
Google Scholar
[9] Hooper T, Cetinkaya C 2003 J. Adhes. Sci. Technol. 17 763
Google Scholar
[10] Lee S H, Kang Y J, Park J G, Busnaina A A, Lee J M, Kim T H, Zhang G, Eschbach F, Ramamoorthy A 2005 Jpn. J. Appl. Phys. 44 5560
Google Scholar
[11] 余本海, 戴能利, 王英, 李玉华, 季玲玲, 郑启光, 陆培祥 2007 物理学报 56 5821
Google Scholar
Yu B H, Dai N L, Wang Y, Li Y H, Ji L L, Zheng Q G, Lu P X 2007 Acta Phys. Sin. 56 5821
Google Scholar
[12] Kim T H, Cho H, Busnaina A, Park J G, Kim D 2013 J. Appl. Phys. 114 063104
Google Scholar
[13] Jang D, Oh J H, Lee J M, Kim D 2009 J. Appl. Phys. 106 014913
Google Scholar
[14] Oh B, Lee J W, Lee J M, Kim D 2008 J. Adhes. Sci. Technol. 22 635
Google Scholar
[15] de Giacomo A, Hermann J 2017 J. Phys. D: Appl. Phys. 50 183002
Google Scholar
[16] Su M G, Cao S Q, Sun D X, Min Q, Dong C Z 2016 Phys. Plasmas 23 033302
Google Scholar
[17] Gu Q Q, Feng G Y, Zhou G R, Han J H, Luo J, Men J L, Jiang Y 2018 Appl. Surf. Sci. 457 604
Google Scholar
[18] Thompson P A, Carofano G C, Kim Y G 1986 J. Fluid Mech. 166 57
Google Scholar
[19] Chen X, Bian B M, Shen Z H, Lu J, Ni X W 2003 Microwave Opt. Technol. Lett. 38 75
Google Scholar
[20] Harith M A, Palleschi V, Salvetti A, Singh D P, Tropiano G, Vaselli M 1989 Opt. Commun. 71 76
Google Scholar
[21] Kumar S S S, Raghu T 2014 Mater. Des. 57 114
Google Scholar
[22] Liu Z F, Zhang Z H, Lu J F, Korznikov A V, Korznikova E, Wang F C 2014 Mater. Des. 64 625
Google Scholar
[23] Akbarpour M R, Torknik F S, Manafi S A 2017 J. Mater. Eng. Perform. 26 4902
Google Scholar
[24] Pleasants S, Kane D M 2003 J. Appl. Phys. 93 8862
Google Scholar
[25] Zheng Y W, Luk’yanchuk B S, Lu Y F, Song W D, Mai Z H 2001 J. Appl. Phys. 90 2135
Google Scholar
[26] Levitas V I, Pantoya M L, Chauhan G, Rivero I 2009 J. Phys. Chem. C 113 14088
Google Scholar
[27] Sun J, Simon S L 2007 Thermochim. Acta 463 32
Google Scholar
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