碳晶的制备与表征及在碳晶板中的发热机理研究
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摘要
采用聚丙烯腈碳纤维通过球磨工艺成功制备出了碳晶发热粉,并将此碳晶粉加工成为碳晶发热板.分别用SEM、XRD、IR、TGA等测试分析技术对制得的碳晶粉进行测试表征,另对制得的碳晶发热板进行体积电阻率和通电温度测试.结果表明:球磨时间会在一定范围内改变碳晶粉的粒径大小,而且会引起碳晶的晶格畸变,碳晶粒径的大小影响碳晶板的导电逾渗阈值;通过通电温度测试测出碳晶粒径0.5μm且碳晶添加量为65%(质量分数)时制备的碳晶板具有合适的发热温度,此条件下的碳晶板在保温箱里60 s左右达到最高温度60℃,在室温中100 s左右达到最高温度46.5℃,可推算出此碳晶板的有效电热转换效率高达80%以上.
Carbon crystal heating powder was successfully prepared by using polyacrylonitrile carbon fiber through ball milling process,and the carbon crystal powder was processed into carbon crystal heating panel. The carbon crystal powder was characterized by SEM,XRD,IR and TGA,and the resistivity and electric temperature of the carbon crystal heating panel were measured. The results showthat the ball grinding time can change the size of carbon powder in a certain range and cause the lattice distortion of carbon crystal. The size of the carbon crystal powder affects the percolation threshold of the carbon crystal panel.The carbon crystal panel prepared by electric temperature test with a carbon grain diameter of 0. 5 μm and the carbon crystal addition of 65 %( mass fraction) has suitable heating temperature. The carbon crystal heating panel under this condition reaches maximum temperature of 60 ℃ when left in the incubator for 60 s and the maximum temperature reaches 46. 5 ℃ when left at room temperature for 100 s. It can be predicted that the effective electrothermal conversion efficiency of the carbon crystal panel can reach as high as80 %.
Carbon crystal heating powder was successfully prepared by using polyacrylonitrile carbon fiber through ball milling process,and the carbon crystal powder was processed into carbon crystal heating panel. The carbon crystal powder was characterized by SEM,XRD,IR and TGA,and the resistivity and electric temperature of the carbon crystal heating panel were measured. The results showthat the ball grinding time can change the size of carbon powder in a certain range and cause the lattice distortion of carbon crystal. The size of the carbon crystal powder affects the percolation threshold of the carbon crystal panel.The carbon crystal panel prepared by electric temperature test with a carbon grain diameter of 0. 5 μm and the carbon crystal addition of 65 %( mass fraction) has suitable heating temperature. The carbon crystal heating panel under this condition reaches maximum temperature of 60 ℃ when left in the incubator for 60 s and the maximum temperature reaches 46. 5 ℃ when left at room temperature for 100 s. It can be predicted that the effective electrothermal conversion efficiency of the carbon crystal panel can reach as high as80 %.
引文
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[3]HOU Y P,SUN T Q.Wettability Modification of Polyacrylonitrile(PAN)-based High Modulus Carbon Fibers with Epoxy Resin by LowTemperature Plasma[J].The Journal of Adhesion,2013,89(3):192-204.
[4]祁蓉,齐暑华,王兆福,等.导热高分子复合材料的研究[J].粘接,2015,36(11):89-93.
[5]张颖异,李运刚,张快,等.高温电热材料的研究发展[J].热加工工艺,2011,40(18):40-47.
[6]贺福.碳纤维的电热性能及其应用[J].化工新型材料,2005,33(6):7-8.
[7]WANG S K,CHUNG D D L.Temperature/Light Sensing Using Carbon Fiber Polymer Matrix Composite[J].Composites Part B:Engineering,1999,30(6):591-601.
[8]李娜,张俊,路鹏程,等.电热载荷对修补碳纤维增强复合材料冲击后压缩性能的影响[J].材料科学与工程学报,2017,35(6):887-891.
[9]THOSTENSON E T,REN Z F,CHOU T W.Advances in the Science and Technology of Carbon Nanotubes and Their Composites:A Review[J].Composites Science and Technology,2001,61(13):1899-1912.
[10]张猛,李杨.碳纤维的制备和电热性能[J].纺织科技进展,2015(7):30-32.
[11]刘新宇,秦伟,王福平,等.冷等离子体接枝处理对碳纤维织物/环氧复合材料界面性能的影响[J].航空材料学报,2003,23(4):40-43.
[12]董华,周倩楠,张敬奎,等.石墨烯/碳纳米管/环氧树脂复合材料导热性能的实验研究[J].热科学与技术,2018,17(1):27-33.
[13]张朋,刘舒,魏志凯,等.纳米碳材料水性电热涂料的制备与性能研究[J].涂料工业,2017,47(4):23-28.
[14]于晓华,王远,詹肇麟,等.晶格畸变能的尺寸效应[J].北京工业大学学报,2014,40(6):928-931.
[15]郭超,添加型纳米导静电涂料的应用及展望[J].涂料工业,2017,47(11):77-80.
[16]沈芳,周延松,胡华宇,等.机械球磨制备PVC/石墨导电复合材料及性能研究[J].化工新型材料,2015,43(12):98-100.
[17]林达儒,谭艳娥,龚丹雷,等.利用DSC测定LED封装环氧树脂玻璃化转变温度[J].电子与封装,2012,12(10):14-18.