液体磁性磨具固相颗粒表面改性及稳定性研究
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摘要
针对液体磁性磨具的沉降稳定性差,提出了采用羧基化多壁碳纳米管和聚二甲基二烯丙基氯化铵水溶液以及水溶性聚合物对磨具中的固相颗粒进行表面改性,提升液体磁性磨具的沉降稳定性。对改性前后的固相颗粒的结构、形貌、电位以及磁性粒子的磁饱和强度的表征和分析表明:改性后的羰基铁粉颗粒外表面吸附有碳纳米管,颗粒密度由4.3 g/cm~3降低到1.55 g/cm~3且改性后的羰基铁粉不易氧化,电位绝对值提升到15.3 mV,饱和磁强度提升了26%;改性后的碳化硅表面吸附一层有机物,电位绝对值提升到68.7 mV;磨具的稳定性有了很大的改善,静置20 h到40 h达到稳定,沉降率低于1%。改性剂的添加会增大磨具的黏度,但对其流变性能的影响较小。经过表面改性固相颗粒,液体磁性磨具的沉降稳定性有了较大的提升。
In view of the poor settlement stability of the fluid magnetic abrasive, the surface modification of solid particles in the abrasive was carried out with the carboxylated multi-wall carbon nanotubes, polydimethyldiallyl ammonium chloride aqueous solution and water-soluble polymer. The structure, morphology and potential of the modified solid particles were characterized. At the same time, FMA with carbonyl iron powder and silicon carbide as suspension phase and deionized water as dispersed phase was prepared. Carbon nanotubes were adsorbed on the surface of the modified carbonyl iron powder particles, which reduced the density of the particles from 4.3 g/cm~3 to 1.55 g/cm~3 and the modified carbonyl iron powder was not easy to rust. The absolute value of the silicon carbide particle potential was improved to 15.3 mV and 68.7 mV respectively and the stability of the abrasives had been greatly improved. Static 20 h to 40 h is stable, and the settlement rate is less than 1%. The viscosity of the FMA could be increased by the addition of the modifier, but the effect on the rheological properties of the FMA was less influence. After the surface modification of solid particles, the settlement stability of fluid magnetic abrasive has been improved.
In view of the poor settlement stability of the fluid magnetic abrasive, the surface modification of solid particles in the abrasive was carried out with the carboxylated multi-wall carbon nanotubes, polydimethyldiallyl ammonium chloride aqueous solution and water-soluble polymer. The structure, morphology and potential of the modified solid particles were characterized. At the same time, FMA with carbonyl iron powder and silicon carbide as suspension phase and deionized water as dispersed phase was prepared. Carbon nanotubes were adsorbed on the surface of the modified carbonyl iron powder particles, which reduced the density of the particles from 4.3 g/cm~3 to 1.55 g/cm~3 and the modified carbonyl iron powder was not easy to rust. The absolute value of the silicon carbide particle potential was improved to 15.3 mV and 68.7 mV respectively and the stability of the abrasives had been greatly improved. Static 20 h to 40 h is stable, and the settlement rate is less than 1%. The viscosity of the FMA could be increased by the addition of the modifier, but the effect on the rheological properties of the FMA was less influence. After the surface modification of solid particles, the settlement stability of fluid magnetic abrasive has been improved.
引文
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[2] Li W D,Lü M,Zhang H.The role of nanometer silicon dioxide in the modification of fluid magnetic abrasive[J].Materials Science Forum,2011,694:229-233
[3] 周钦,孙桓五,张云飞,等.聚丙烯酸改良液体磁性磨具稳定性实验研究[J].磁性材料及器件,2014;45(2):58-62Zhou Q,Sun H W,Zhang Y F,et al.Experimental research on the stability improvement of liquid magnetic abrasive by polyacrylic acid[J].Journal of Magnetic Materials and Devices,2014;45(2):58-62 (in Chinese)
[4] 赵志强,段海栋,孙桓五.液体磁性磨具孔光整加工工艺参数优化研究[J].现代制造工程,2017;2):14-18,29Zhao Z Q,Duan H D,Sun H W.Optimization of process parameters when finishing hole by fluid magnetic abrasives[J].Modern Manufacturing Engineering,2017;2):14-18,29 (in Chinese)
[5] 孙桓五.液体磁性磨具光整加工技术研究[D].太原:太原理工大学,2008Sun H W.Study on the fluid magnetic abrasive finishing technology[D].Taiyuan:Taiyuan University of Technology,2008 (in Chinese)
[6] 王光华,孔金丞,李雄军,等.羰基铁粉表面改性及其热稳定性研究[J].中国粉体技术,2011,17(2):5-8Wang G H,Kong J C,Li X J,et al.Investigation on surface modification and thermal stability of carbonyl iron particles[J].China Powder Science and Technology,2011,17(2):5-8 (in Chinese)
[7] 魏美玲,马峻峰,陈文,等.羰基铁粉体表面化学镀镍改性的研究[J].硅酸盐通报,2003(5):17-20Wei M L,Ma J F,Chen W,et al.Study on surface modification of carbonyl iron powder by electroless plating[J].Bulletin of the Chinese Ceramic Society,2003(5):17-20 (in Chinese)
[8] 叶志民,庄海燕,董伟,等.羰基铁粉表面改性及其电磁性能研究[J].材料开发与应用,2014,29(6):87-92Ye Z M,Zhuang H Y,Dong W,et al.Study on the electromagnetic properties of the surface modified carbonyl iron[J].Development and Application of Materials,2014,29(6):87-92 (in Chinese)
[9] 王鹏川,金洙吉.铁基金刚石磁性磨料的制备及其性能研究[J].表面技术,2016,45(12):78-83Wang P C,Jin Z J.Preparation and performance of iron-based diamond magnetic abrasive[J].Surface Technology,2016,45(12):78-83 (in Chinese)
[10] Ting T H,Jau Y N,Yu R P.Microwave absorbing properties of polyaniline/multi-walled carbon nanotube composites with various polyaniline contents[J].Applied Surface Science,2012,258:3184-3190
[11] 张云飞,孙桓五,王娟,等.聚乙二醇对液体磁性磨具稳定性的影响研究[J].现代制造工程,2016(5):15-18Zhang Y F,Sun H W,Wang J,et al.Experimental research on the stability improvement of liquid magnetic abrasive by polyethylene glycol[J].Modern Manufacturing Engineering,2016(5):15-18 (in Chinese)
[12] Gesoglu M,Güneyisi E,Asaad D S,et al.Properties of low binder ultra-high performance cementitious composites:comparison of nanosilica and microsilica[J].Construction and Building Materials,2016,102:706-713
[13] Li G Y,Wang P M,Zhao X H.Mechanical behavior and microstructure of cement composites incorporating surface-treated multi-walled carbon nanotubes[J].Carbon,2005,43(6):1239-1245
[14] 范培育,付业伟,李贺军,等.碳纳米管双层纸基摩擦材料研究[J].机械科学与技术,2011,30(12):2107-2110,2115Fan P Y,Fu Y W,Li H J,et al.Study of the two-layer paper-based friction materials containing carbon nanotubes as friction-layer[J].Mechanical Science and Technology for Aerospace Engineering,2011,30(12):2107-2110,2115 (in Chinese)
[15] 杨小朋,李秀红,李文辉,等.一种新型粘弹性磁性磨具的制备及其加工实验研究[J].机械设计与制造,2017(6):97-100Yang X P,Li X H,Li W H,et al.The preparation of a new viscoelastic magnetic abrasive tool and finishing experiment research[J].Machinery Design & Manufacture,2017(6):97-100 (in Chinese)
[16] 胡晶,谢国治,顾家新,等.多元助剂改性羰基铁粉雷达波低频吸波性能研究[J].材料导报,2018,32(4):520-524Hu J,Xie G Z,Gu J X,et al.Low frequency radar wave absorbing performance of carbonyl iron powder modified by compound auxiliary agents[J].Materials Review,2018,32(4):520-524 (in Chinese)
[17] 陈逢军,唐宇,苗想亮,等.磨料射流表面抛光研究综述[J].表面技术,2015,44(11):119-127Chen F J,Tang Y,Miao X L,et al.Review on the abrasive jet surface polishing (AJP) technology[J].Surface Technology,2015,44(11):119-127 (in Chinese)
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