FeSO_4浓度对Ti-6Al-4V合金表面微弧氧化膜层性能的影响
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摘要
通过电子显微镜(SEM)、X射线衍射(XRD)和X射线光电子能谱(XPS)分析了Ti-6Al-4V合金表面微弧氧化膜层的微观形貌、相组成和化学成分,采用拉伸试验机及红外光谱仪(FTIR)测试了膜层的结合强度以及5～20μm波段内的红外发射率。结果表明,随着(NaPO_3)_6电解液中FeSO_4浓度的升高,膜层的厚度、粗糙度及结合强度增加,红外发射率呈先增加后减小的趋势,其中,Fe SO4浓度为6 g/L时膜层的红外发射率达到最大值0. 86。结合XRD与XPS测试结果,推断元素Fe与P分别以非晶态的Fe_2O_3、H_2PO_4~-、P_2O_7~(4-)存在。Fe掺杂与非晶态的无序结构特征有利于局域能级的生成和增强原子间的极性振动,进而提高膜层的红外发射率。
Micro-arc oxidation( MAO) coatings on Ti-6Al-4V alloys were fabricated in the electrolyte mixed with( NaPO_3)_6 and FeSO_4 for various concentrations. And the microstructure,phase composition and chemical composition of the coatings were characterized by scanning electron microscope( SEM),X-ray diffraction( XRD) and X-ray photoelectron spectroscopy( XPS). The bonding strength and infrared emissivity in a wavelength range of 5 ～20 μm of the coatings were measured by the tensile test machine and Fourier Transform Infrared( FTIR). The results show that the thickness,roughness and bonding strength of the coatings increase with the addition of FeSO_4,thus the infrared emissivity first increases and then decreases.The coating exhibits the highest infrared emissivity value( about 0. 86) when the concentration of FeSO_4 is 6 g/L. The elements Fe and P existe as the amorphous state of Fe_2O_3,H_2PO_4~-,P_2O_7~(4-) in the coatings based on the XRD and XPS results. The Fe doping and disordered structure of the amorphous state are conducive to the generation of local energy levels and the enhancement of polar oscillation between atoms,which promote the increase of the infrared emissivity.
Micro-arc oxidation( MAO) coatings on Ti-6Al-4V alloys were fabricated in the electrolyte mixed with( NaPO_3)_6 and FeSO_4 for various concentrations. And the microstructure,phase composition and chemical composition of the coatings were characterized by scanning electron microscope( SEM),X-ray diffraction( XRD) and X-ray photoelectron spectroscopy( XPS). The bonding strength and infrared emissivity in a wavelength range of 5 ～20 μm of the coatings were measured by the tensile test machine and Fourier Transform Infrared( FTIR). The results show that the thickness,roughness and bonding strength of the coatings increase with the addition of FeSO_4,thus the infrared emissivity first increases and then decreases.The coating exhibits the highest infrared emissivity value( about 0. 86) when the concentration of FeSO_4 is 6 g/L. The elements Fe and P existe as the amorphous state of Fe_2O_3,H_2PO_4~-,P_2O_7~(4-) in the coatings based on the XRD and XPS results. The Fe doping and disordered structure of the amorphous state are conducive to the generation of local energy levels and the enhancement of polar oscillation between atoms,which promote the increase of the infrared emissivity.
引文
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[3]叶菲,叶卫平,程旭东. Cr2O3-MnO2系高温红外陶瓷涂层的制备与研究[J].红外技术,2010,32(5):263-267.
[4]Minea A A. Studies on a cost-efficient technique for increasing furnaces energy efficiency. Environmental aspects[J].Metalurgia International,2009,14(10):53-57.
[5]李晓雷,张驰,王萌,等.新型MoSi2-Al2O3-Si O2系耐高温高发射涂层的热膨胀系数调控[J].稀有金属材料与工程,2015,44(增刊1):200-203.
[6]Li Z,Zheng F,Gong H Q,et al. Study on Zr Si O4-aluminosilicate glass coating with high infrared emissivity and antioxidation properties[J]. Composites Communications,2017,4:16-19.
[7]黄建平. EB-PVD制备La-CeO2涂层的微观结构与热辐射性能研究[D].哈尔滨:哈尔滨工业大学,2013.
[8]Wang Y M,Tian H,Shen X E,et al. An elevated temperature infrared emissivity ceramic coating formed on 2024aluminium alloy by microarc oxidation[J]. Ceramics International,2013,39(3):2869-2875.
[9] Ge Y L,Wang Y M,Zhang Y F,et al. The improved thermal radiation property of Si C doped microarc oxidation ceramic coating formed on niobium metal for metal thermal protective system[J]. Surface and Coatings Technology,2017,309:880-886.
[10]Wang Y H,Liu Z G,Ouyang J H,et al. Influence of electrolyte compositions on structure and high-temperatureoxidation resistance of microarc oxidation coatings formed on Ti2AlNb alloy[J]. Journal of Alloys and Compounds,2015,647:431-437.
[11]Li Q B,Liang J,Liu B X,et al. Effects of cathodic voltages on structure and wear resistance of plasma electrolytic oxidation coatings formed on aluminium alloy[J]. Applied Surface Science,2014,297:176-181.
[12]Li Q B,Yang WB,Liu C C,et al. Correlations between the growth mechanism and properties of micro-arc oxidation coatings on titanium alloy:effects of electrolytes[J].Surface and Coating Technology,2017,316:162-170.
[13]金光,熊伟,李玉海,等. LY12铝合金微弧氧化尺寸变化及膜层相组成[J].特种铸造及有色合金,2009,29(3):201-203.
[14]薛文斌,邓志威,陈如意,等.钛合金在硅酸盐溶液中微弧氧化陶瓷膜的组织结构[J].金属热处理,2000(2):5-6.
[15]Zhu X L,Chen J,Scheideler L,et al. Effects of topography and composition of titanium surface oxides on osteoblast responses[J]. Biomaterials,2004,25(18):4087-4103.
[16]Qiao L P,Lou J,Zhang S F,et al. The entrance mechanism of calcium and phosphorus elements into micro arc oxidation coatings developed on Ti6Al4V alloy[J]. Surface and Coatings Technology,2016,285:187-196.
[17]Santos A D,Araujo J R,Landi S M,et al. A study of the physical,chemical and biological properties of Ti O2coatings produced by micro-arc oxidation in a Ca-P-based electrolyte[J]. Journal of Materials Science Materials in Medicine,2014,25(7):1769-1780.
[18]Shokouhfar M,Dehghanian C,Montazeri M,et al. Preparation of ceramic coating on Ti substrate by plasma electrolytic oxidation in different electrolytes and evaluation of its corrosion resistance:Part II[J]. Applied Surface Science,2012,258(7):2416-2423.
[19]Ma H,Li D,Liu C,et al. An investigation of(Na PO3)6effects and mechanisms during micro-arc oxidation of AZ31magnesium alloy[J]. Surface and Coatings Technology,2015,266:151-159.
[20]Tang H,Xin T,Sun Q,et al. Influence of Fe SO4concentration on thermal emissivity of coatings formed on titanium alloy by micro-arc oxidation[J]. Applied Surface Science,2011,257(24):10839-10844.
[21]Tang H,Wang F. Effects of nano-Fe2O3powder on thermal emission property of microarc oxidation coating on titanium alloy[J]. Materials Science and Technology,2013,28(12):1523-1526.