• 제목/요약/키워드: Dip-coating process

검색결과 131건 처리시간 0.023초

액상공정을 이용한 탄화규소 세라믹 후막의 제조 (Preparation of Silicon Carbide Ceramic Thick Films by Liquid Process)

  • 김행만;김준수;이홍림;안영철;윤존도
    • 한국세라믹학회지
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    • 제49권1호
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    • pp.95-99
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    • 2012
  • Silicon carbide ceramics are used for oxidation resistive coating films due to their excellent properties like high strength, good oxidation resistance, and good abrasion resistance, but they have poor formability and are prepared by vapor process which is complicated, costly, and sometimes hazardous. In this study, preparation of silicon carbide coating film by liquid process using polymer precursor was attempted. Coating film was prepared by dip coating on substrate followed by heat treatment in argon at $1200^{\circ}C$. By changing the dipping speed, the thickness was controlled. The effects of plasticizer, binder, or fiber addition on suppression of crack generation in the polymer and ceramic films were examined. It was found that fiber additives was effective for suppressing crack generation.

Preparation of high-performance nanofiltration membrane with antioxidant properties

  • Yu, Feiyue;Zhang, Qinglei;Pei, Zhiqiang;Li, Xi;Yang, Xuexuan;Lu, Yanbin
    • Membrane and Water Treatment
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    • 제13권4호
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    • pp.191-199
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    • 2022
  • In industrial production, the development of traditional polyamide nanofiltration (NF) membrane was limited due to its poor oxidation resistance, complex preparation process and high cost. In this study, a composite NF membrane with high flux, high separation performance, high oxidation resistance and simple process preparation was prepared by the method of dilute solution dip coating. And the sulfonated polysulfone was used for dip coating. The results indicated that the concentration of glycerin, the pore size of the based membrane, the composition of the coating solution, and the post-treatment process had important effects on the structure and performance of the composite NF membrane. The composite NF membrane prepared without glycerol protecting based membrane had a low flux, when the concentration of glycerin increased from 5% to 15%, the pure water flux of the composite NF membrane increased from 46.4 LMH to 108.2 LMH, and the salt rejection rate did not change much. By optimizing the coating system, the rejection rate of Na2SO4 and PEG1000 was higher than 90%, the pure water flux was higher than 40 LMH (60psi), and it can withstand 20,000 ppm.h NaClO solution cleaning. When the post treatment processes was adjusted, the salt rejection rate of NaCl solution (250 ppm) reached 45.5%, and the flux reached 62.2 LMH.

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

  • 박재혁;김순호;정재인;양지훈;이경황;이명훈
    • 한국표면공학회지
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    • 제51권4호
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    • pp.224-230
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    • 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.

비산화성 분위기에 의한 용융아연도금의 특성 연구 (Study of Characteristics of Hot Dip Galvanized Steel Strip by Oxygen-free Finishing)

  • 진영구;김흥윤
    • 한국표면공학회지
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    • 제28권5호
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    • pp.300-308
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    • 1995
  • The effect of nitrogen finishing for the control of coating weight in a nitrogen sealing box on the coating surface property in hot dip galvanizing process has been studied. The coated surface is free of oxide marks and edge overcoated. The coating uniformity is excellent ; the standard deviation of the coating thickness along width of the specimen was $1~1.2\mu\textrm{m}$ in the box whereas $2.5~3\mu\textrm{m}$ in the air. Considering surface quality of the coating such as oxide mark, edge overcoated and zinc dust, the oxygen content between 40 and 200 ppm was suggested in the box in addition the oxygen content of at least 40 ppm or the minimum dew point of $-27^{\circ}C$ is required to prevent a zinc vaporization.

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용융아연 도금강판의 도금층에 잔류한 드로스 검출에 관한 연구 (A Study on Detecting Dross in Coating Layer on Hot-dip Galvanizing Steels)

  • 김유철;이호종
    • 한국표면공학회지
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    • 제36권6호
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    • pp.466-474
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    • 2003
  • To develop a method of detecting dross in coating layer on hot-dip galvanizing steel, chemical etching behavior of the artificial coating layers with top and bottom dross were investigated. After chemical etching with the mixture of picric acid and sodium thiosulfate, each of the top and bottom dross take its distinct color, and alloy layer in coating is also observed. Defects in the coating layers of HGI(hot rolled galvanized iron), CGI(continuous galvanized steel sheet) and GA(galvannealed steel) were analysed, and methods of dross detection which can be applied to inspection process in manufacture were suggested.

수소제조를 위한 다공성 FeCrAl 금속 합금 Foam의 NiO 촉매 담지 및 미세구조 분석 (Synthesis and Microstructure Analysis of NiO Catalysts Coated on the FeCrAl Metal Alloy Foam for Hydrogen Production)

  • 이유진;안건형;박만호;이창우;최상현;정주용;조성종;이근재;안효진
    • 한국재료학회지
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    • 제24권8호
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    • pp.393-400
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    • 2014
  • NiO catalysts were successfully coated onto FeCrAl metal alloy foam as a catalyst support via a dip-coating method. To demonstrate the optimum amount of NiO catalyst on the FeCrAl metal alloy foam, the molar concentration of the Ni precursor in a coating solution was controlled, with five different amounts of 0.4 M, 0.6 M, 0.8 M, 1.0 M, and 1.2 M for a dip-coating process. The structural, morphological, and chemical bonding properties of the NiO-catalyst-coated FeCrAl metal alloy foam samples were assessed by means of field-emission scanning electron microscopy(FESEM), scanning electron microscopy-energy dispersive spectroscopy(SEM-EDS), X-ray diffraction(XRD), and X-ray photoelectron spectroscopy(XPS). In particular, when the FeCrAl metal alloy foam samples were coated using a coating solution with a 0.8 M Ni precursor, well-dispersed NiO catalysts on the FeCrAl metal alloy foam compared to the other samples were confirmed. Also, the XPS results exhibited the chemical bonding states of the NiO phases and the FeCrAl metal alloy foam. The results showed that a dip-coating method is one of best ways to coat well-dispersed NiO catalysts onto FeCrAl metal alloy foam.

알루미나-지르코니아 세라믹 막 제조에 관한 연구 (A Study on Fabrication of $Al_2O_3-ZrO_2$ Inorganic Membranes)

  • 김병훈;나용한
    • 한국세라믹학회지
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    • 제32권10호
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    • pp.1147-1161
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    • 1995
  • When ceramic membrance was made from metal salt solution in place of metal akoxide solution, crack free and good adhesion to supporter was optimized for sol stability and good adhesion force. A starting sol was prepared from aluminum oxychloride aqueous solutjion in order to inhibit the grain growthof Al2O3 during heat treatment. The crack free dip coating can't be achieved in 1mol/ι zirconium oxychloride solution because of the high viscosity which interferes with the hydration copolymerization between Al3+ ion and Zr4+ ion. Thus Al2O3-ZrO2 sol stability and viscosity for dip coating was effective when 0.01 mol/ι zirconium oxychloride was added. The minimizing of crack and achieving better adhesion to the supporter wa obtained by microwave drying, surfactant addition and ultrasonic dip coating in wet atmosphere. The result seems to minimize the capillary force and improve the adhesive ability to supporter during the process. Where the average pore size of Al2O3-ZrO2 ultrafilter ceramic membrane measured 17 Å by the BET method and observed γ-Al2O3 phase with tetragonal zirconia after firing at 700℃.

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졸겔법을 이용한 바륨페라이트 박막 제조 (Preparation of Barium Ferrite Thin Film by Sol-Gel Method)

  • 변태봉;조원덕;김태옥
    • 한국세라믹학회지
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    • 제34권1호
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    • pp.37-44
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    • 1997
  • 졸겔법중 딥코팅법을 이용하여 조성비 2Fe/Ba=5.25 졸로부터 바륨페라이트 박막을 제조하였다. 졸의 겔화과정은 4단계로 구분할 수 있으며, 8$0^{\circ}C$에서 90분간 반응시켜 제조한 졸이 코팅용 졸로서 가장 적합한 특성을 나타내었다. 박막층에 형성된 침상 형태의 입자들은 기판에 수평 하게 위치하고 있었으며, 박막 두께가 증가함에 따라 그 경향은 증가하였다. 침상형 입자의 자화용이축 방향은 장축 방향이었다.

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The Development of Coating Weight Model and Control Logics in Continuous Galvanizing Line

  • Kook, Chae-Hong;Tae, Shin-Ki
    • 제어로봇시스템학회:학술대회논문집
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    • 제어로봇시스템학회 2001년도 ICCAS
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    • pp.121.5-121
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    • 2001
  • For the last decade, remarkable progress in the coating weight uniformity of hot dip galvanized product has been made to overcome the tightening quality constraints and produce cost-effective galvanized products. This progress results from research and development works for more efficient air knife, more accurate model of coating process, more precise measurement of coating weight and more efficient control logics. The activities for an efficient mathematical model to predict coating weight and several control logics which has been implemented on the No.1 CGL, No. 2 CGL, and PGL at KwangYang Steel Works are reviewed in this article.

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정량 주입(Pre-metered) 코팅 방식을 이용한 유기 트랜지스터 반도체 박막 제작 연구 (Organic Semiconducting Thin Films Fabricated by Using a Pre-metered Coating Method for Organic Thin Film Transistors)

  • 조찬연;전홍구;최진성;김윤기;임종선;정준영;조성윤;이창진;박병주
    • 한국전기전자재료학회논문지
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    • 제25권7호
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    • pp.531-536
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    • 2012
  • We herein present results of flat and uniform polymer-blended small molecular semiconductor thin films. Which were produced for organic thin film transistors (OTFTs), using a simple pre-metered horizontal dipping process. The organic semiconducting thin films were composed of 6,13-bis(triisopropylsilylethynyl)-pentacene (TIPS-PEN) composite blended with a polymer binder of poly(${\alpha}$-methylstyrene) (PaMS). We show that the pre-metered horizontal-dip-coating(H-dip-coating) process allowed the critical control of the thickness of the blended TIPS-PEN:PaMs thin film. The fabricated OTFTs using the TIPS-PEN:PaMs films exhibited maximum field-effect mobility of $0.22\;cm^2\;V^{-1}\;s^{-1}$. These results demonstrated that H-dip-coated TIPS-PEN:PaMS films show considerable promise for the production of reliable, reproducible, and high-performance OTFTs.