• 제목/요약/키워드: thermal spray process

검색결과 198건 처리시간 0.024초

인공해양환경에서 Arc Thermal and Plasma Arc Spray 공법이 적용된 Zn 코팅 강재의 내식성능 평가에 관한 연구 (Study on Corrosion Resistance Performance of Zn Coating Applied by Arc Thermal and Plasma Arc Spray Process in Artificial Ocean Water)

  • 잔 낫;이한승
    • 한국건축시공학회:학술대회논문집
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    • 한국건축시공학회 2020년도 봄 학술논문 발표대회
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    • pp.83-84
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    • 2020
  • In present study, we have deposited the Zinc coating using arc thermal spray and plasma arc spray processes onto the steel substrate and durability of the deposited coating was evaluated. The bond adhesion result shows that plasma arc sprayed Zn coating exhibited higher in its value compared to arc thermal spray. SEM shows that Zn coating deposited by plasma arc process is more compact, less porous and adherent compare to arc spray process. The corrosion resistance properties are evaluated in artificial ocean water solution with exposure periods. EIS results show that total impedance at 0.01 Hz of plasma arc sprayed coating is higher than arc thermal spray owing to the compact and less porous morphology. It is concluded that plasma arc sprayed Zn coating is better than arc thermal spray process.

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모사 부식 환경에서 플라즈마 아크용사에 의한 Al 코팅의 부식특성에 관한 실험적 연구 (Experimental Study on the Corrosion Behavior of Al Coatings Applied by Plasma Thermal Arc Spray under Simulated Environmental Conditions)

  • 정화랑
    • 한국건축시공학회지
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    • 제23권5호
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    • pp.559-570
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    • 2023
  • 건설산업에서 사용되는 구조용 강재의 부식은 산업화로 인해 많은 공격적인 이온이 내포된 대기 환경에서 증가추세에 있다. 따라서 본 연구에서는 아크 및 플라즈마 아크용사로 Al 코팅을 용착하여 Cl-와 CO32-같은 공격적인 이온을 다량 함유한 Society of Automotive Engineering(SAE) J2334 용액의 모사대기환경에서 그 효과를 비교하였다. 다양한 분석기법으로 코팅 특성과 부식 메커니즘을 고찰하였다. 플라즈마 아크용사로 용착된 Al 코팅은 밀도 있고 균일하면 층층이 적층이 잘 되었고 높은 부착력이 나타났다. 이 공법으로 용착된 Al 코팅을 SAE J2334 용액에 기간별로 침지하여 측정한 개회로전위(OCP)는 아크용사로 용착된 Al 코팅보다 더 양전성(electropositive)한 값을 보여주었다. 플라즈마 아크용사는 총 임피던스가 아크용사보다 높게 나타났다. SAE J2334 용액에 23일 침지하였을 때 플라즈마 아크용사 Al 코팅의 부식속도는 아크용사에 비해 20% 감소하였다.

니켈기 용사코팅의 스플랫 형성에 관한 연구 (Study on the Splat Formation of Ni-based Thermal Sprayed Coatings)

  • 김균택;이상석;이도형;김영식
    • 동력기계공학회지
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    • 제16권2호
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    • pp.49-53
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    • 2012
  • Thermal spray coatings developed by deposition of splats, it formed by impacting molten droplets on substrates during thermal spray process. In this study, the Ni-based coatings were fabricated by thermal spray process with two different process parameters, oxygen gas flow and acetylene gas flow, with three different levels of each parameters. The morphology of splats and microstructure were observed by optical microscope. Hardness test were performed on the Ni-based coatings. It was confirmed that process parameters of thermal spray process have effect in morphology of splats. These effects also have important implications on the deposit microstructure and properties of Ni-based coatings.

분무건조 및 대기 플라즈마 용사에 의한 지르코니아 열차폐 코팅재의 제조 및 평가 (Fabrication and Characterization of Zirconia Thermal Barrier Coatings by Spray Drying and Atmospheric Plasma Spraying)

  • 김철;허용석;김태우;이기성
    • 한국세라믹학회지
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    • 제50권5호
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    • pp.326-332
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    • 2013
  • In this study, we prepared yttria stabilized zirconia granules for thermal barrier coatings using a spray drying process. First, we characterized the properties of granules such as flow rate and packing density for utilizing the air plasma spray process. The flow rate and packing density data showed 0.732 g/sec and 2.14 $g/cm^3$, respectively, when we used larger and denser particles, which are better than hollow granules or smaller spherical granules. Second, we chose larger, spherical granules fabricated in alcohol solvent as starting powders and sprayed it on the bondcoat/nimonic alloy by an atmospheric plasma spray process varying the process parameters, the feeding rate, gun speed and spray distance. Finally, we evaluated representative thermal and mechanical characteristics. The thermal expansion coefficients of the coatings were $11{\sim}12.7{\times}10^{-6}/^{\circ}C$ and the indentation stress measured was 2.5 GPa at 0.15 of indentation strain.

스프레이 코팅 기술 (Spray Coating Technology)

  • 이창희
    • 한국분무공학회지
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    • 제13권4호
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    • pp.193-199
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    • 2008
  • Spray coating is a versatile surface modification technology in which coating is built-up based on the successive deposition of micron-scaled particles. Depending on the coating materials, the coatings can meet the required mechanical properties, corrosion resistance, and other properties of base materials. Spraying processes are mainly classified into thermal and kinetic spraying according to their bonding mechanism and deposition characteristics. Specifically, thermal spraying process can be further classified into many categories based on the design and mechanism of the process, such as frame spraying, arc spraying, atmospheric plasma spraying (APS), and high velocity oxygen-fuel (HVOF) spraying, etc. Kinetic spraying or cold gas dynamic spraying is a newly emerging coating technique which is low-temperature and high-pressure coating process. In this paper, overall view of thermal and kinetic spray coating technologies is discussed in terms of fundamentals and industrial applications. The technological characteristics and bonding mechanism of each process are introduced. Deposition behavior and properties of technologically remarkable materials are reviewed. Furthermore, industrial applications of spray coating technology and its potentials are prospected.

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용사법에 의한 Al/Al-SiC 복합재료의 제조 (Fabrication of Al/Al-SiC Composites by Thermal Spray Process)

  • 김균택;김영식
    • 동력기계공학회지
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    • 제10권2호
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    • pp.93-98
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    • 2006
  • Metal matrix composites(MMCs) reinforced with ceramic particulates are receiving increasing attention because their high specific strength, low coefficient of thermal expansion and excellent wear resistance. Especially, Al-based composites(AMCs) have been widely applied for the aerospace and automotive industries. Such composites are mainly fabricated by the cast, powder metallurgy and infiltration process. In this study, SiC particulate reinforced Al-based composites were fabricated by thermal spray process and their wear behavior were investigated. Composites with different spray parameter were fabricated by using flame spray apparatus. Microstructure and wear behavior of the composites were observed by scanning electron microscope(SEM) and electron probe micro-analysis(EPMA).

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초음속 저온분사법에 의한 알루미늄 합금 모재의 변형과 적층된 알루미늄 층의 물성에 대한 연구 (Study about material properties of Al particles and deformation of Al alloy substrate by cold gas dynamic spray)

  • 이재철;안성훈
    • 한국소성가공학회:학술대회논문집
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    • 한국소성가공학회 2006년도 춘계학술대회 논문집
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    • pp.145-148
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    • 2006
  • Cold gas dynamic spray is a relatively new coating process by which coatings can be produced without significant heating during the process. Cold gas dynamic spray is conducted by powder sprayed by supersonic gas jet, and generally called the kinetic spray or cold-spray. Cold-spray was developed in Russia in the early 1980s to overcome the defect of thermal spray method. Its low process temperature can minimize thermal stress and also reduce the deformation of the substrate. Most researches on cold-spray have focused on micro scale coating, but our research team tried to apply this method to macro scale deposition. The macro scale deposition causes deformation of a thin substrate which is usually convex to the deposited side. In this research, the main cause of the deformation was investigated using 6061-T6 aluminum alloy and properties of deposited aluminum layer such as coefficient of thermal expansion, Elastic modulus, hardness, electric conductivity were measured. From the result of the analysis, it was concluded that compressive residual stress was the main reason of substrate deformation while CTE had little effect.

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STS316 용사코팅의 최적 공정 설계 (Process Optimization of Thermal-sprayed STS316 Coating)

  • 김균택;김영식
    • 한국해양공학회지
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    • 제24권1호
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    • pp.161-165
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    • 2010
  • In the present study, process optimization for thermal-sprayed STS316 coating has been performed using $L_9(3^4)$ orthogonal array and analysis of variance (ANOVA). STS316 coatings were fabricated by flame spray process on steel substrate, and the hardness test and microstructure observation of the coatings were studied. The results of hardness test were analyzed by ANOVA. The ANOVA results showed that the spray distance had the greatest effect on hardness of the coating, on the other hands, the effects of oxygen gas flow and spray distance were ignorable. From these results, the optimal combination of the flame spray parameters could be derived, and confirmation experiment was carried out to verify these derived results. The calculated hardness of the coatings by ANOVA was found to approximately close to that of confirmation experimental result. Thus, it was considered that design of experiments using orthogonal array and ANOVA was effective for process optimization of thermal-sprayed STS316 coating.

아크 용사를 이용한 쾌속 금형 제조 기술 (A study on rapid tooling technology using thermal spray process)

  • 김경하;김선경;유영은;제태진;최두선
    • Design & Manufacturing
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    • 제2권2호
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    • pp.20-24
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    • 2008
  • Recently, the study for production technology is focused on cycle time reduction as various products are manufactured. In order to manufacture tool and die, rapid prototyping and rapid tooling are researched. Stereolithography apparatus, selective laser sintering, 3D printing, laminated object manufacturing are developed in rapid prototype. The purpose of this study is to develop rapid tooling technology using thermal spray process. This technology is not well-known to korea, but this study will be contributed in development of domestic molds industry through continuous research and development.

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다구찌 기법을 이용한 용사코팅의 공정 최적화 (Optimization for Thermal spray Process by Taguchi Method)

  • 김균택;김영식
    • 동력기계공학회지
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    • 제16권2호
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    • pp.54-59
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    • 2012
  • In the present study, process optimization for thermal-sprayed Ni-based alloy coating has been performed using Taguchi method and analysis of variance(ANOVA). Ni-based alloy coatings were fabricated by flame spray process on steel substrate, and the hardness test and wear test were performed. Experiments were designed as per Taguchi's L9 orthogonal array and tests were conducted with different Oxygen gas flow, Acetylene gas flow, Powder feed rate and Spray distance. Multi response signal to noise ratio (MRSN) was calculated for the response variables and the optimum combination level of factors was obtained simultaneously using Taguchi's parametric design.