• Title/Summary/Keyword: Coating Films

Search Result 1,360, Processing Time 0.026 seconds

Ferroelectric Properties of Pb(Zr,Ti)$O_3$ Thick Films with Solution Coatings (Solution 코팅에 따른 Pb(Zr,Ti)$O_3$ 후막의 강유전 특성)

  • Park, Sang-Man;Lee, Sung-Gap;Noh, Hyun-Ji;Lee, Young-Hie;Bae, Seon-Gi
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
    • /
    • 2006.11a
    • /
    • pp.35-36
    • /
    • 2006
  • The influence of the concentration of precursor solution and the number of solution coatings on the densification of the Pb($Zr_xTi_{1-x}$)$O_3$(PZT) thick films was studied. PZT powder and PZT precursor solution were prepared by sol-gel method and PZT thick films were fabricated by the screen-printing method on the alumina substrates. The powder and solution of composition were PZT(70/30) and PZT(30/70), respectively. The coating and drying procedure was repeated 4 times. And then the PZT precursor solution was spin-coated on the PZT thick films. A concentration of a coating solution was 0.5 to 2.0 mol/L[M] and the number of coating was repeated from 0 to 6. The relative dielectric constant of the PZT thick film was increased with increasing the number of solution coatings and the thick films with 15M, 6-time coated showed the 698. The remanent polarization of the 1.5M, 6-time coated PZT thick films was 38.3 ${\mu}C/cm^2$.

  • PDF

Chacterization and Preparation of SiO2-TiO2-AgO thin Films by the Chemical Solution Process (용액법에 의한 SiO2-TiO2-AgO계 박막의 제조 및 특성에 관한 연구)

  • Kim, Sangmoon;Shim, Moon-Sik;Lim, Yongmu;Hwang, Kyuseog
    • Journal of Korean Ophthalmic Optics Society
    • /
    • v.3 no.1
    • /
    • pp.217-222
    • /
    • 1998
  • Coating films of $SiO_2-TiO_2-AgO$ have been prepared on soda-lime-silica slide glasses and single crystal silicon wafer by the sol-gel method using a spin-coating technique. Commercially available tetraethyl orthosilicate, titanium trichloride, and silver-nitrates were used as starting materials. The heat treatment temperature of this coating films was $500^{\circ}C$ properly, obtained from TG-DTA result. The films with thickness of 310 nm were prepared by 5 times coating. In the case of l0 mol% AgO, the film showed a crack-free and smooth surface, but the higher Ago content exhibited the more pin hole and the segregated cluster of AgO. The IR absorbance of the films decreased in the range of 400 nm to 700 nm with the increase of annealing temperature. And the reflectance of the coating films decreased and the color was changed light yellow to white yellow with the increase of Ago content.

  • PDF

Fabrication of PZT Film by a Single-Step Spin Coating Process

  • Oh, Seung-Min;Kang, Min-Gyu;Do, Young-Ho;Kang, Chong-Yun;Nahm, Sahn;Yoon, Seok-Jin
    • Proceedings of the Korean Vacuum Society Conference
    • /
    • 2011.02a
    • /
    • pp.193-193
    • /
    • 2011
  • To obtain ceramic films, the sol-gel coating technique has been broadly used with heat treatment, but crack formation tend to occur during heat treatment in thick sol-gel films. We prepared PZT thin films by sol-gel method with single-step spin coating process. The PZT solution have been synthesized using lead acetate ($Pb(CH_3COO)_2$), zirconium acetylacetonate ($Zr(OC_3H_7^n)_4$), and titanium diisopropoxide bis(acetylacetonate) 75wt% in isopropanol ($Ti(OC_3H_7^i)_2(OC_3H_7^n)_2$) as starting materials and n-propanol was selected as a solvent. The poly(vynilpyrrolidone) (PVP) was added with 0, 0.25, 0.5, 0.75, and 1 molar ratios to control viscosity of solution. We investigated influence of the viscosity on thickness, microstructure, and electrical properties of final PZT films. Thermo-gravimetric analysis and differential scanning calorimeter (TGA/DSC) was carried out from room temperature to $800^{\circ}C$ in order to measure pyrolysis temperature. Structural characteristics were analyzed by X-ray diffraction (XRD) and scanning electron microscopy (SEM). Ferroelectric and dielectric properties were measured by RT66A (Radiant) and impedance analyzer (Agilent), respectively. The thicknesses of PZT films depended on incorporation of an excess amount of PVP. Finally, we obtained PZT films of good quality without crack formation via single-step spin coating.

  • PDF

Improvement of Corrosion Resistance by Mg Films Deposited on Hot Dip Aluminized Steel using a Sputtering Method (용융알루미늄 도금 강판 상에 스퍼터링법으로 형성된 마그네슘 코팅막에 의한 내식성 향상)

  • Park, ae-Hyeok;Kim, Soon-Ho;Jeong, Jae-In;Yang, Ji-Hoon;Lee, Kyung-Hwang;Lee, Myeong-Hoon
    • Journal of the Korean institute of surface engineering
    • /
    • v.51 no.4
    • /
    • pp.224-230
    • /
    • 2018
  • In this study, Mg films were prepared on hot dip aluminized steel (HDA) by using a sputtering method as a high corrosion resistance coating. The corrosion resistance of the Mg films was improved by controlling the morphology and the crystal structure of films by adjusting the Ar gas pressure during the coating process. Anodic polarization measurement results confirm that the corrosion resistance of the Mg films was affected by surface morphology and crystal structure. The corrosion resistance of the Mg coated HDA specimen increased with decreasing crystal size of the Mg coating and it was also improved by forming a film with denser morphology. The crystal structure oriented at Mg(101) plane showed the best corrosion resistance among crystal planes of the Mg metals, which is attributed to its relatively low surface energy. Neutral salt spray test confirmed that corrosion resistance of HDA can be greatly improved by Mg coating, which is superior to that of HDG (hot dip galvanized steel). The reason for the improvement of the corrosion resistance of Mg films on hot dip aluminized steel was due to the barrier effect by the Mg corrosion products formed by the corrosion of the Mg coating layer.

Characteristics of Rhenium-Iridium coating thin film on tungsten carbide by multi-target sputter

  • Cheon, Min-Woo;Kim, Tae-Gon;Park, Yong-Pil
    • Journal of Ceramic Processing Research
    • /
    • v.13 no.spc2
    • /
    • pp.328-331
    • /
    • 2012
  • With the recent development of super-precision optical instruments, camera modules for devices, such as portable terminals and digital camera lenses, are increasingly being used. Since an optical lens is usually produced by high-temperature compression molding methods using tungsten carbide (WC) alloy molding cores, it is necessary to develop and study technology for super-precision processing of molding cores and coatings for the core surface. In this study, Rhenium-Iridium (Re-Ir) thin films were deposited onto a WC molding core using a sputtering system. The Re-Ir thin films were prepared by a multi-target sputtering technique, using iridium, rhenium, and chromium as the sources. Argon and nitrogen were introduced through an inlet into the chamber to be the plasma and reactive gases. The Re-Ir thin films were prepared with targets having a composition ratio of 30 : 70, and the Re-Ir thin films were formed with a 240 nm thickness. Re-Ir thin films on WC molding core were analyzed by scanning electron microscope (SEM), atomic force microscope (AFM), and Ra (the arithmetical average surface roughness). Also, adhesion strength and coefficient friction of Re-Ir thin films were examined. The Re-Ir coating technique has received intensive attention in the coating processes field because of promising features, such as hardness, high elasticity, abrasion resistance and mechanical stability that result from the process. Re-Ir coating technique has also been applied widely in industrial and biomedical applications. In this study, WC molding core was manufactured, using high-performance precision machining and the effects of the Re-Ir coating on the surface roughness.

Relations Between Dispersion of CNTs and Electrical Conductivity in the Hydrophobic CNT/PVDF Composite Film (소수성 CNT/PVDF 복합막에서 CNT의 분산과 전도성의 관계)

  • Lee, Sunwoo
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
    • /
    • v.28 no.7
    • /
    • pp.462-466
    • /
    • 2015
  • In this paper, we investigated the relations between dispersion of CNTs (carbon nanotubes) and electrical conductivity in the CNT/PVDF (polyvinylidene fluoride) composite film. By adding hydrophobic CNTs as filler into the PVDF matrix, we fabricated hydrophobic and electrically conducting polymer coating film. Dispersion of CNTs in the CNT/PVDF composite film plays a significant role in terms of electrical conductivity and wetting property. Spray coating method was used to form the CNT/PVDF composite films by injecting the dispersed CNTs in the PVDF solution with different weight ratios from 0.7 wt% to 7 wt%. We investigated the electrical properties and contact angles of the CNT/PVDF composite films with the CNT concentration. Finally we discussed the conducting mechanism and feasibility of the CNT/PVDF composite film for the conducting polymer films.

The Surface Image Properties of BST Thin Film by Depositing Conditions (코팅 조건에 따른 BST 박막의 표면 이미지 특성)

  • Hong, Kyung-Jin;Ki, Hyun-Cheol;Ooh, Soo-Hong;Cho, Jae-Cheol
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
    • /
    • 2002.05b
    • /
    • pp.107-110
    • /
    • 2002
  • The optical memory devices of BST thin films to composite $(Ba_{0.7}\;Sr_{0.3})TiO_{3}$ using sol-gel method were fabricated by changing of the depositing layer number on $Pt/Ti/SiO_{2}/Si$ substrate. The structural properties of optical memory devices to be ferroelectric was investigated by fractal analysis and 3-dimension image processing. The thickness of BST thin films at each coating numbers 3, 4 and 5 times was $2500[\AA]$, $3500[\AA]$ and $3800[\AA]$. BST thin films exhibited the most pronounced grain growth. The surface morphology image was roughness with coating numbers. The thin films increasing with coating numbers shows a more textured and complex configuration.

  • PDF

Structural Characteristics of Spray-coated Poly (vinylidene fluoride) Thin Films Prepared with Different Organic Solvents

  • Jeong, Nak-Cheon;Im, Yeong-Taek;Lee, Seon-U;Sin, Baek-Gyun
    • Proceedings of the Korean Vacuum Society Conference
    • /
    • 2014.02a
    • /
    • pp.392.2-392.2
    • /
    • 2014
  • Poly (vinylidene fluoride) thin films were deposited by a spray-coating technology. Two organic solvents with different boiling point were used to prepare the mixture solution for spray coating process: N-Methylpyrrolodone ($B.P.=202^{\circ}C$); Tetrahydrofuran ($B.P.=66^{\circ}C$). Post-deposition annealing temperature was varied for the spray-coated Poly(vinylidene fluoride) thin films. Structural characteristics of the thin films were comparatively investigated by FT-IR and XRD in relation with the organic solvent and post-deposition annealing temperature.

  • PDF

The Preparation of Sol-Gel Derived Aminoalkoxysilane Films and its Application for Oxygen Barrier (솔-젤법을 이용한 aminoalkoxysilane 산소차단필름의 제조)

  • Kim, Hyun-Joon
    • Journal of the Semiconductor & Display Technology
    • /
    • v.5 no.3 s.16
    • /
    • pp.17-21
    • /
    • 2006
  • The oxygen barrier films were formed on poly(ethylene terephthalate) (PET) substrate by a sol-gel process using aminoalkoxysilanes. The coating layers were characterized by FT-IR and SEM. The oxygen permeability coefficients of coating films were measured by variable volume method, and then the influences of solvent ratio in sol and film drying temperature on the oxygen barrier properties were investigated. The aminoalkoxysilane coating films exhibited much higher oxygen barrier properties than PET film. The oxygen permeability coefficient of the film coated with each of APTEOS and APTMOS was measured to be $2.96{\times}10^{-6}$ and $3.05{\times}10^{-5}\;GPU$, respectively, while that of PET film was $1.16{\times}10^{-4}\;GPU$.

  • PDF

Preparation of Hard Coating Solutions by Sol-Gel Reaction of Glycidoxypropyl Trimethoxysilane and Methacryloxypropyl Trimethoxysilane (Glycidoxypropyl Trimethoxysilane과 Methacryloxypropyl Trimethoxysilane의 Sol-Gel 반응을 이용한 하드코팅 용액의 제조)

  • Oh, Seung Kyun;Chung, Jae Shik;Lee, Bum Suk;Song, Ki Chang
    • Korean Chemical Engineering Research
    • /
    • v.46 no.2
    • /
    • pp.274-278
    • /
    • 2008
  • Hard coating solutions were prepared from glycidoxypropyl trimethoxysilane (GPTMS) and methacryloxypropyl trimethoxysilane (MPTMS) precursors with different molar ratios of 10:0, 9:1, 7:3, 5:5, 3:7, and 0:10, respectively, by the sol-gel method. The polycarbonate (PC) sheets were spin-coated, and cured at $130^{\circ}C$ for 3 h. The effect of the GPTMS:MPTMS molar ratios of the mixture was investigated on the properties of coating films. The highest pencil hardness and adhesion to PC sheets of coating films were found for solution with GPTMS:MPTMS molar ratio of 5:5. Also, the pencil hardness of coating films was increased with increasing the $H_2O$ content in the coating solutions.