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Polyoxymethylene (POM) is a good absorber of CO2 laser, so it is important to study the ablation mechanisms of polymer materials. Because the laser impact phenomena are terribly complex, there is no general understanding of the mechanism of laser induced ablation of POM. An explicit thermal-chemical coupling model is presented in this paper, which takes account of laser heating, phase transition, thermal degradation, and plume emission. Random thermal degradation is adopted to describe the chemical reaction process when POM is heated up, and consequently, the components of the degradation products under different degradation rates are acquired. The group contribution method is used to evaluate the thermodynamic properties of the degradation products, and the normal boiling point and critical temperature of the product mixture are obtained by the mixing law. If the product temperature is lower than the critical temperature, POM is ablated in the manner of liquid evaporation; otherwise the ablation mechanism is gas-dynamics emission. As for the former, Knudsen layer relationship is employed to calculate the ablation mass; and for the latter, the conservation laws associated with the Jouguet condition are used. Based on the model, the quantitative results of ablation mass, ablation temperature, product component and mass rate of different ablation mechanisms vs. laser fluence are achieved and analyzed, which are consistent with the experimental data quite well.
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Keywords:
- laser ablation /
- polyoxymethylene /
- thermal-chemical coupling /
- critical temperature
[1] Ageichik A A, Repina E V, Rezunkov Y A, Safronov A L 2009 Tech. Phys. 54 402
[2] Phipps C, Birkan M, Bohn W, Eckel H A, Horisawa H, Lippert T, Michaelis M, Rezunkov Y, Sasoh A, Schall W, Scharring S, Sinko J 2010 J. Propul. Power 26 609
[3] Zhang Y, Lu X, Zhou M L, Lin X X, Zheng Z Y, Li Y T, Zhang J 2011 Chin. Phys. B 20 087901
[4] Pfleging W, Baldus O, Bruns M, Baldini A, Bemporad E 2005 Proc. SPIE 5713 479
[5] Lippert T 2004 Adv. Polym. Sci. 168 51
[6] Schall W O, Eckel H A, Tegel J, Waiblinger F, Walther S 2004 Final Report (London: EOARD) FA8655-03-1-3061
[7] Watanabe K, Mori K, Sasoh A 2006 J. Propul. Power 22 1150
[8] Sinko J E, Sasoh A 2011 Int. J. Aerospace Innovat. 3 93
[9] Saki T, Ichihashi K, Matsuda A, Sasoh A 2009 Proceeding of 40th AIAA Plasmadynamics and Laser Conference (San Antonio: AIAA) p3590
[10] Tong H F 2006 Ph. D. Dissertation (Hefei: University of Science and Technology of China) (in Chinese) [童慧峰 2006 博士学位论文 (合肥: 中国科学技术大学)]
[11] Sinkoa J E, Phipps C R 2009 Appl. Phys. Lett. 95 131105
[12] Bityurin N 1999 Appl. Surf. Sci. 138-139 354
[13] Tan X Y, Zhang D M, Li Z H, Guan L, Li L 2005 Acta Phys. Sin. 54 3915 (in Chinese) [谭新玉, 张端明, 李智华, 关丽, 李莉 2005 物理学报 54 3915]
[14] Hu H F, Ji Y, Hu Y, Ding X Y, Liu X W, Guo J H, Wang X L, Zhai H C 2011 Chin. Phys. B 20 044204
[15] Bityurin N, Luk'yanchuk B S, Hong M H, Chong T C 2003 Chem. Rev. 103 519
[16] Poling B E (translated by Zhao H L) 2006 The Properties of Gases and Liquids (Beijing: Chemical Industry Press) pp8-29 (in Chinese)[柏林 B E 著 (赵红玲译) 2006 气液物性估算手册 (北京: 化学工业出版社) 第8–29页]
[17] Dong X F, Fang L G, Chen L 2006 Estimating Principles of Properties and Computer Calculation (Beijing: Chemical Industry Press) pp41, 42 (in Chinese) [董新法, 方利国, 陈砺 2006 物性估算原理及计算机计算 (北京: 化学工业出版社) 第41, 42页]
[18] Liu Z Y 1998 AIChE J. 44 1709
[19] Pekker L, Keidar M, Cambier J L 2008 J. Appl. Phys. 103 034906
[20] Peng D Y, Robinson D B 1976 Ind. Eng. Chem. Fundam. 15 59
[21] Tong J G, Wu M Y, Wang P Y 2006 Advanced Engineering Thermodynamics (Beijing: Science Press) pp78, 79 (in Chinese) [童钧耕, 吴孟余, 王平阳 2006 高等工程热力学 (北京: 科学出版社) 第78,79页]
[22] Stoliarov S I, Walters R N 2008 Polym. Degrad. Stabil. 93 422
[23] Duan Y F 2004 M. S. Dissertation (Chengdu: Shanxi University) (in Chinese) [段怡飞 2004 硕士学位论文 (成都: 四川大学)]
[24] Suzuki K, Sawada K, Takaya R, Sasoh A 2008 J. Propul. Power 24 834
[25] Mao X, Russo R E 1997 Appl. Phys. A 64 1
[26] Duan Y, Li H, Ye L, Liu X 2006 J. Appl. Polymer Sci. 99 3085
[27] Brunco D P, Thompson M O, Otis C E, Goodwin P M 1992 J. Appl. Phys. 72 344
[28] Arnold N, Bityurin N 1999 Appl. Phys. A 68 615
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[1] Ageichik A A, Repina E V, Rezunkov Y A, Safronov A L 2009 Tech. Phys. 54 402
[2] Phipps C, Birkan M, Bohn W, Eckel H A, Horisawa H, Lippert T, Michaelis M, Rezunkov Y, Sasoh A, Schall W, Scharring S, Sinko J 2010 J. Propul. Power 26 609
[3] Zhang Y, Lu X, Zhou M L, Lin X X, Zheng Z Y, Li Y T, Zhang J 2011 Chin. Phys. B 20 087901
[4] Pfleging W, Baldus O, Bruns M, Baldini A, Bemporad E 2005 Proc. SPIE 5713 479
[5] Lippert T 2004 Adv. Polym. Sci. 168 51
[6] Schall W O, Eckel H A, Tegel J, Waiblinger F, Walther S 2004 Final Report (London: EOARD) FA8655-03-1-3061
[7] Watanabe K, Mori K, Sasoh A 2006 J. Propul. Power 22 1150
[8] Sinko J E, Sasoh A 2011 Int. J. Aerospace Innovat. 3 93
[9] Saki T, Ichihashi K, Matsuda A, Sasoh A 2009 Proceeding of 40th AIAA Plasmadynamics and Laser Conference (San Antonio: AIAA) p3590
[10] Tong H F 2006 Ph. D. Dissertation (Hefei: University of Science and Technology of China) (in Chinese) [童慧峰 2006 博士学位论文 (合肥: 中国科学技术大学)]
[11] Sinkoa J E, Phipps C R 2009 Appl. Phys. Lett. 95 131105
[12] Bityurin N 1999 Appl. Surf. Sci. 138-139 354
[13] Tan X Y, Zhang D M, Li Z H, Guan L, Li L 2005 Acta Phys. Sin. 54 3915 (in Chinese) [谭新玉, 张端明, 李智华, 关丽, 李莉 2005 物理学报 54 3915]
[14] Hu H F, Ji Y, Hu Y, Ding X Y, Liu X W, Guo J H, Wang X L, Zhai H C 2011 Chin. Phys. B 20 044204
[15] Bityurin N, Luk'yanchuk B S, Hong M H, Chong T C 2003 Chem. Rev. 103 519
[16] Poling B E (translated by Zhao H L) 2006 The Properties of Gases and Liquids (Beijing: Chemical Industry Press) pp8-29 (in Chinese)[柏林 B E 著 (赵红玲译) 2006 气液物性估算手册 (北京: 化学工业出版社) 第8–29页]
[17] Dong X F, Fang L G, Chen L 2006 Estimating Principles of Properties and Computer Calculation (Beijing: Chemical Industry Press) pp41, 42 (in Chinese) [董新法, 方利国, 陈砺 2006 物性估算原理及计算机计算 (北京: 化学工业出版社) 第41, 42页]
[18] Liu Z Y 1998 AIChE J. 44 1709
[19] Pekker L, Keidar M, Cambier J L 2008 J. Appl. Phys. 103 034906
[20] Peng D Y, Robinson D B 1976 Ind. Eng. Chem. Fundam. 15 59
[21] Tong J G, Wu M Y, Wang P Y 2006 Advanced Engineering Thermodynamics (Beijing: Science Press) pp78, 79 (in Chinese) [童钧耕, 吴孟余, 王平阳 2006 高等工程热力学 (北京: 科学出版社) 第78,79页]
[22] Stoliarov S I, Walters R N 2008 Polym. Degrad. Stabil. 93 422
[23] Duan Y F 2004 M. S. Dissertation (Chengdu: Shanxi University) (in Chinese) [段怡飞 2004 硕士学位论文 (成都: 四川大学)]
[24] Suzuki K, Sawada K, Takaya R, Sasoh A 2008 J. Propul. Power 24 834
[25] Mao X, Russo R E 1997 Appl. Phys. A 64 1
[26] Duan Y, Li H, Ye L, Liu X 2006 J. Appl. Polymer Sci. 99 3085
[27] Brunco D P, Thompson M O, Otis C E, Goodwin P M 1992 J. Appl. Phys. 72 344
[28] Arnold N, Bityurin N 1999 Appl. Phys. A 68 615
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