• Title/Summary/Keyword: Annealing Process

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The effect of cold rolling reduction ratio on the texture evolution in Al-5% Mg alloy (Al-5%Mg 합금 판재의 집합조직 발달에 미치는 냉간 압하율의 영향)

  • Choi, J.K.;Kim, H.W.;Kang, S.B.;Choi, S.H.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • 2008.10a
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    • pp.102-105
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    • 2008
  • To investigate the evolution of deformation texture during cold rolling deformation, cold rolling process on a commercial Al-5% Mg sheet was carried out at different rolling reduction ratio. The evolution of annealing texture in cold-rolled Al-5% Mg sheet was also investigated. The evolution of recrystallization texture during annealing process strongly depends on the rolling reduction ratio before heat treatment. Visco-plastic self-consistent (VPSC) polycrystal model was used to predict r-value anisotropy of the cold-rolled and annealed Al-5% Mg sheets. The change of volume fraction for the major texture components was also analyzed.

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Study on Laser irradiation characteristics for Oxide TFTs on Flexible Substrate (산화물 반도체 Flexible Display 소자 제작을 위한 Laser 가공 특성 연구)

  • Son, Hyeok;Lee, Gong-Su;Jeong, Han-Uk;Kim, Gwang-Yeol;Choe, Yeong-Deok
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2009.11a
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    • pp.203-203
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    • 2009
  • Low temperature annealing for oxide TFTs including IGZO on PI substrate is the essential process to fabricate flexible display devices, since low heat-resistance on PI and PEN substrates limits the temperature range. Laser annealing is one of the promising candidates for low temperature process, and it has been used for various application in semiconductor and LCD fabrication. We irradiated laser to solution-based IGZO thin films on PI substrate were irradiated to laser beam, and investigated laser damage of PI layer. Based on transmittance analysis, wavelength(532nm) and scan speed(1000mm/s) is the optimized condition for laser irradiation about ink-Jet printed oxide TFTs on PI substrates.

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The effect of annealing temperature and solvent on the fabrication of YBCO thin films by MOD-TFA process (MOD-TFA 공정으로 YBCO 박막제조 시 열처리 온도와 용매의 영향)

  • 허순영;유재무;김영국;고재웅;이동철
    • Progress in Superconductivity
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    • v.5 no.1
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    • pp.84-87
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    • 2003
  • $YBa_2$$Cu_3$$O_{7-x}$ (YBCO) thin films were fabricated by MOD-TFA process via dip-coating method on LaAlO$_3$, (LAO) single crystalline substrates. In this study, we investigated effect of annealing temperature and solvent on the microstructure and texture of YBCO thin films. The precursor films were annealed at various temperature to improve surface morphologies and phase purities. It was shown that the films annealed at relatively lower and higher temperature exhibit low phase purity and crystallinity. The effect of various solvents on surface morphologies and second phase has been investigated.

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Multi-station Fixture Layout Design Using Simulated Annealing

  • Kim, Pansoo;Seun, Ji Ung
    • Management Science and Financial Engineering
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    • v.10 no.2
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    • pp.73-87
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    • 2004
  • Automotive and aircraft assembly process rely on fixtures to support and coordinate parts and subassemblies. Fixture layout in multi-station panel assemblies has a direct dimensional effect on final products and thus presents a quality problem. This paper describes a methodology for fixture layout design in multi -station assembly processes. An optimal fixture layout improves the robustness of a fixture system against environmental noises, reduces product variability, and eventually leads to manufacturing cost reduction. One of the difficulties raised by multi-station fixture layout design is the overwhelmingly large number of design alternatives. This makes it difficult to find a global optimality and, if an inefficient algorithm is used, may require prohibitive computing time. In this paper, simulated annealing is adopted and appropriate parameters are selected to find good fixture layouts. A four-station assembly process for a sport utility vehicle (SUV) side frame is used throughout the paper to illustrate the efficiency and effectiveness of this methodology.

Characterization of coupling optical modulator to the applied frequency (인가주파수에 따른 결합형 광변조기 특성변화)

  • 강기성
    • Electrical & Electronic Materials
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    • v.9 no.6
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    • pp.584-592
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    • 1996
  • Coupling optical modulator which on the $LiTaO_3$ substrate is fabricated by using proton exchange method and self-aligned method. Proton exchange of proton diffusion method was applied to pattern a waveguide on $LiTaO_3$ substrate. The annealing at >$400^{\circ}C$ was carded out to control waveguide width and depth. The depths of the two annealed optical waveguides, which were measured by using .alpha.-step, were 1.435 K.angs. and 1.380 K.angs. Using .alpha.-step facility, we examined that the width of waveguides is increased from 5.mu.m to 6.45 .mu.m and 6.3.mu.m due to the annealing effects. The process of proton exchange was done at 150.deg. C for 120 min, >$200^{\circ}C$ for 60 min and annealing process was done at >$400^{\circ}C$ for 90 min, >$400^{\circ}C$ for 60 min. The high speed coupling optical modulator has very good figures of merits; the measured high frequency power were achieved.

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The rapid thermal annealing effects and its application to electron devices of Sol-Gel derived ferroelectric PZT thin films (졸-겔법으로 형성한 강유전체 PZT박막의 고온 단시간 열처리효과 및 전자 디바이스에의 응용)

  • 김광호
    • Electrical & Electronic Materials
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    • v.7 no.2
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    • pp.152-156
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    • 1994
  • The rapid thermal annealing effects of Sol-Gel derived ferroelectric PZT thin films were investigated. It was found that rapid thermal annealing(RTA) of spin coated thin films on silicon typically >$800^{\circ}C$ for about 1 min. was changed to the perovskite phase. Rapid thermally annealed films recorded maximum remanent polarization of about 5 .mu.C/cm$^{2}$, coercive field of around 30kV/cm. The switching time for polarization reversal was about 220ns. The films of RTA process showed smooth surface, and high breakdown voltages of over 1 MV/cm and resistivity of $1{\times}{10^12}$ .ohm.cm at 1 MV/cm. It was verified that the polarization reversal of the PZT film was varied partially with applying the multiple short pulse.

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Enhancement of Photoluminescence Intensity of ZnS Nanowires by Annealing in O2 (산소 분위기에서 열처리시 ZnS 나노선의 발광 강도 변화)

  • Kwon, Jin-Up;Lee, Jong-Woo
    • Journal of Surface Science and Engineering
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    • v.45 no.5
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    • pp.193-197
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    • 2012
  • The influence of annealing process in an $O_2$ atmosphere on the photoluminescence (PL) spectra properties of ZnS nanowires has been investigated. ZnS nanowires with the diameters approximately 100 nm and the lengths a few tens micrometers were synthesized by evaporating ZnS powders on Si substrates while using an Au thin film as a catalyst. ZnS nanowires had an NBE emission band at 430 nm in the violet region. The emission intensity was improved drastically by a process in which ZnS nanowires were heat-treated at $500^{\circ}C$ in an $O_2$ atmosphere for 45 minutes.

Effect of Pre/Post-Treatment on the Performance of Cu(In,Ga)(S,Se)2 Absorber Layer Manufactured in a Two-Step Process (KCN 에칭 및 CdS 후열처리가 Cu(In,Ga)(S,Se)2 광흡수층 성능에 미치는 영향)

  • Kim, A-Hyun;Lee, GyeongA;Jeon, Chan-Wook
    • New & Renewable Energy
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    • v.17 no.4
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    • pp.36-45
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    • 2021
  • To remove the Cu secondary phase remaining on the surface of a CIGSSe absorber layer manufactured by the two-step process, KCN etching was applied before depositing the CdS buffer layer. In addition, it was possible to increase the conversion efficiency by air annealing after forming the CdS buffer layer. In this study, various pre-treatment/post-treatment conditions wereapplied to the S-containing CIGSSe absorber layerbefore and after formation of the CdS buffer layer to experimentally confirm whether similareffects as those of Se-terminated CIGSe were exhibited. Contrary to expectations, it was noted that CdS air annealing had negative effects.

Thermoelectric Properties of p- type FeSi2 Processed by Mechanical Alloying and Plasma Thermal Spraying (기계적 합금화 p-type FeSi2의 플라즈마 용사 성형 및 열전 특성)

  • Choi Mun-Gwan;Ur Soon-Chul;Kim IL-Ho
    • Korean Journal of Materials Research
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    • v.14 no.3
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    • pp.218-223
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    • 2004
  • P-type $\beta$-FeSi$_2$ with a nominal composition of $Fe_{0.92}Mn_{0.08}Si_2$ powders has been produced by mechanical alloying process. As-milled powders were spray dried and consolidated by atmospheric plasma thermal spraying as a rapid sintering process. As-milled powders were of metastable state and fully transformed to $\beta$-$FeSi_2$ phase by subsequent isothermal annealing. However, as-thermal sprayed $Fe_{0.92}Mn_{0.08}Si_2$ consisted of untransformed mixture of $\alpha$-$Fe_2Si_{5}$ and $\varepsilon$-FeSi phases. Isothermal annealing has been carried out to induce transformation to the thermoelectric semiconducting $\beta$-$FeSi_2$ phase. Isothermal annealing at $845^{\circ}C$ in vacuum gradually led to the thermoelectric semiconducting $\beta$-$FeSi_2$ phase transformation, but some residual metallic $\alpha$ and $\varepsilon$ phases were unavoidable even after prolonged annealing. Thermoelectric properties of $\beta$-$FeSi_2$ materials before and after isothermal annealing were evaluated. Seebeck coefficient increased and electric conductivity decreased with increasing annealing time due to the phase transition from metallic phases to semiconducting phases. Thermoelectric properties showed gradual increment, but overall properties appeared to be inferior to those of vacuum hot pressed specimens.

The Effects of Pre-Annealing on Electrochemical Preparation for Nanoporous Tungsten Oxide Films (전기화학적 제조를 통한 나노다공성 텅스텐 산화물 성장의 전열처리 영향)

  • Kim, Sun-Mi;Kim, Kyung-Min;Choi, Jin-Sub
    • Journal of the Korean Electrochemical Society
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    • v.14 no.3
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    • pp.125-130
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    • 2011
  • We describe that the surface and thickness of nanoporous $WO_3$ fabricated by both light-induced and light-absent anodization are affected by pre-annealing process from $200^{\circ}C$ to $600^{\circ}C$. As a result, the nanoporous $WO_3$ with a thickness of $1.83{\mu}m$ can be achieved by anodization for 6 hours after pre-annealing at $400^{\circ}C$ without illumination of light. Moreover, the thickness of nanoporous $WO_3$ fabricated by pre-annealing is thicker than that of $WO_3$ prepared by non-annealing process. However, the light illumination during anodization leads to convert the crystalline structure obtained by pre-annealing, which interfere the growth of nanoporous $WO_3$. In this paper, we discuss about the growth mechanism of these different nanoporous $WO_3$ films.