杨博,李杰,李鹤.具有高介电常数特性涂层的选取与性能分析[J].表面技术,2016,45(8):40-44.
YANG Bo,LI Jie,LI He.Selection and Performance for Coating with High Dielectric Constant[J].Surface Technology,2016,45(8):40-44
具有高介电常数特性涂层的选取与性能分析
Selection and Performance for Coating with High Dielectric Constant
投稿时间:2016-04-20  修订日期:2016-08-20
DOI:10.16490/j.cnki.issn.1001-3660.2016.08.007
中文关键词:  介电常数  涂层  氧化铝  氧化钛  喷涂  腐蚀
英文关键词:dielectric constant  coating  Al2O3  TiO2  spraying  corrosion
基金项目:陕西延长石油(集团)有限责任公司项目(ycsy2015ky-B-20)
作者单位
杨博 陕西延长石油(集团)有限责任公司研究院,西安 710075 
李杰 陕西延长石油(集团)有限责任公司研究院,西安 710075 
李鹤 陕西延长石油(集团)有限责任公司研究院,西安 710075 
AuthorInstitution
YANG Bo Shaanxi Yanchang Petroleum Company Institute, Xi′an 710075, China 
LI Jie Shaanxi Yanchang Petroleum Company Institute, Xi′an 710075, China 
LI He Shaanxi Yanchang Petroleum Company Institute, Xi′an 710075, China 
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中文摘要:
      目的 为了克服现有铁氟龙涂层介电常数低、使用寿命短等缺点,寻求并制备具有高介电常数且兼有耐磨、耐腐蚀、硬度高、绝缘能力强、化学稳定性好、抗高温氧化能力强等特性的涂层,从而提高探针灵敏度系数及机械性能,提高测量精度,延长使用寿命。方法 通过对现有各类涂层的对比,选取Al2O3-3%TiO2、Al2O3-13%TiO2和Al2O3-20%TiO2三种常规粒径的陶瓷粉末进行试验测试。分别评价涂层的绝缘性后,优选一种涂层进行喷涂试验、介电常数测试、腐蚀性测试及拉伸测试,并与铁氟龙涂层进行对比。结果 Al2O3-13%TiO2和Al2O3-20%TiO2两种粉末涂层与基体之间的电阻值分别为0.57 MΩ和0.42 MΩ,Al2O3-3%TiO2陶瓷涂层的绝缘性良好。Al2O3-3%TiO2粉末的粒径范围为15~45 μm,粒度分布较分散,涂层的相对介电常数高达290,是铁氟龙涂层的132倍,并且涂层表面较均匀,但存在少量孔隙。经过腐蚀性测试,铁氟龙涂层试样的质量损失为23.4 mg,Al2O3-3%TiO2涂层试样的质量损失极少,仅为0.40 mg。拉伸测试时,当载荷为52 kN时,Al2O3-3%TiO2涂层被拉长20 mm时,试样涂层才出现裂缝,而铁氟龙涂层被拉伸7 mm时就完全剥落。结论 Al2O3-3%TiO2陶瓷涂层绝缘性良好,介电常数是铁氟龙涂层的132倍,粒度的分散性分布能使喷涂效果更佳,涂层与基体的剪切结合强度高,耐蚀性较强,实验结果表明能够完全替代现有的铁氟龙涂层。
英文摘要:
      Objective In order to overcome the low dielectric constant and short life of existing teflon coating, this work aims to seek and prepare coating with high dielectric constant and features like high wear resistance, good corrosion resistance, high hardness, strong insulating ability, good chemical stability and high temperature oxidation resistance and thus to improve the sensitivity coefficient and mechanical performance of probe, increase measurement precision and extend service life. Methods Ceramic powder like Al2O3-3%TiO2, Al2O3-13%TiO2 and Al2O3-20%TiO2 with three conventional particle sizes were selected and tested after being compared with the existing various types of coating. Their insulativity was evaluated respectively. Then one coating was chosen out for spraying test, permittivity measurement, corrosion test and extension test, and then was compared with teflon coating. Results The resistance of Al2O3-13%TiO2 and Al2O3-20%TiO2 between the coating and the substrate was respectively 0.57 MΩ and 0.42 MΩ, which indicated that the Al2O3-3%TiO2 coating had better insulativity. The particle size of Al2O3-3%TiO2 powder was 15~45 μm, and its particle distribution was dispersed. Its relative dielectric constant was as high as 290, 132 times of teflon coating. The coating surface was relatively uniform, but there was a small amount of porosity. After corrosion test, the mass loss of Al2O3-3%TiO2 coating sample was only 0.40 mg, far less than teflon coating 23.4 mg. For the extension test, if the load was 52 kN, the Al2O3-3%TiO2 sample would crack only when the sample was elongated for 20 mm; but the teflon coating peeled off completely when it was elongated for 7 mm. Conclusion Compared with teflon coating, Al2O3-3%TiO2 ceramic coating has better insulativity, higher dielectric constant (132 times of teflon coating), better spraying effect by virtue of its dispersible distribution of particle size, higher bonding strength between coating and substrate and stronger corrosion resistance. The experimental result shows that Al2O3-3%TiO2 ceramic coating can completely replace the existing teflon coating.
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