• Title/Summary/Keyword: Silicon Oil

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Analysis of 4WD Viscous Coupling Characteristics at Steady State (4WD용 비스코스 커플링 정상상태 특성 해석)

  • 이정석;김경하;김현진;김현수
    • Transactions of the Korean Society of Automotive Engineers
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    • v.6 no.2
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    • pp.21-31
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    • 1998
  • In this paper, a thermo-mechanical model for viscous coupling(VC) was suggested and torque equation in viscous mode was derived considering the effects of geometry of the plates, thermo-mechanical dynamics, silicon oil characteristics and dissolved air characteristics in the silicon oil. Theoretical results were in good accordance with experimental results demonstrating that VC thermo-mechanical model and the theoretical equations, response of the torque transmitted, pressure, temperature and time to the hump were investigated. Simulation results showed that filling rate of the silicon oil plays an integral role not only in the steady state torque characteristics but also in determining the time to hump.

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SiC Synthesis by Using Sludged Si Power (폐슬러지 Si 분말을 이용한 SiC 제조)

  • 최미령;김영철;장영철
    • Journal of the Microelectronics and Packaging Society
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    • v.10 no.3
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    • pp.67-71
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    • 2003
  • Sawing silicon ingot with abrasive slurry generates sludge that includes abrasive powders, cutting oil, and silicon powders. The abrasive powders and cutting oil are being separated and reused. Mixing the remained stodged silicon powders with carbon powders and subsequent heat-treatment are conducted to produce silicon carbide. The size of SiC whiskers and powders was smaller than the conventionally grown silicon carbide whiskers that were synthesized by adding micron-size metal impurities. Impurity related mechanism is attributed to the formation of the silicon carbide whiskers, as metal impurities are contained in the stodged silicon powders.

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Studies of Physicochemical Properties of Baby Powder Developed from Rice-flour (쌀 분말을 이용한 유아용 파우더의 이화학적 특성 연구)

  • Han, Sang-Ik;Jang, Ki Chang;Seo, Woo Duck;Oh, Seong-Hwan;Ra, Ji-Eun;Song, Yu-Cheon;Lee, Jong-Hee;Kim, Byung-Joo;Nam, Min-Hee;Lee, Jin-Tae
    • Journal of Life Science
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    • v.23 no.7
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    • pp.879-885
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    • 2013
  • Baby powder is an astringent powder used to prevent diaper rash. It also has other cosmetic uses. In general, it is composed of talc powder (talcum powder). Talc powder is harmful if inhaled because it can cause significant lung damage. With the aim of developing a new rice-based baby powder, three kinds of rice varieties were selected and pulverized. To determine the cost-effectiveness of the different states of rice powder, several milling processes were tried, and the powder characteristics of the resulting rice powder, such as particle size, biological activities, digitalized color value, and moisture content before and after coating treatment with essential oil and silicon oil, were examined. "Goami" showed good flour characteristics with respect to lightness (92.0, $L^*$[D65] value) and particle size ($8.9{\mu}m$). SEM analysis showed that the rice powder particles coated in the essential oil and silicon oil showed a smoother and rounder appearance than those of the talc powder. In addition, the average particle size was decreased by the essential oil and silicon oil coating. The silicon oil coating solved the problem of moisture absorption in rice flour. Rice flour properly coated with essential oil and silicon oil shows great potential as a new material source of powder.

The Effects of HLB Value of the Surfactants Added in the Silicon Oil Emulsion Antifoamer on the Antifoaming Ability (실리콘오일 에멀젼 소포제 조성에 있어서 유화제의 HLB가 소포성능에 미치는 영향)

  • Kim, Young-Ho
    • Journal of the Korean Applied Science and Technology
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    • v.27 no.3
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    • pp.223-232
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    • 2010
  • The effects of HLB value of nonionic mixed surfactants on the stability and antifoaming ability for silicon oil type emulsions were studied. To obtain a stable silicone emulsions, a higher HLB values and higher content of surfactants were preferred. To obtain a good antifoaming ability, however, a lower HLB value (more hydrophobic) and a lower content of the surfactants were preferred. It was observed, at lower HLB values(8 or 9), that the silicone oil drops were spreaded on the foam surface and effectively reduced the surface tension. And the spreading phenomena presumably acted as an antifoaming mechanism. Therefore, a higher hydrophobicity of the silicone oil emulsion resulted in a higher ability of antifoaming action.

Tribological Characteristics of ABS-like Resin According to Silicon Oil Viscosity (실리콘 오일 점도에 따른 ABS-like 레진의 트라이볼로지 특성)

  • Park, Seonghyun;Son, Jungyu;Woo, Seongwoong;Ryu, Euijin;Lee, Hyunseop
    • Tribology and Lubricants
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    • v.36 no.6
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    • pp.365-370
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    • 2020
  • Recently, additive manufacturing (AM) technology has been applied to various industries such as automotive, aviation, medical, and electronics. Most prior studies are limited to the mechanical properties of printed materials, and few studies are being conducted on their tribological characteristics. However, the friction and wear characteristics of the material should be studied in order to utilize the components manufactured using AM technology as mechanical parts. In this study, the friction and wear characteristics of acrylonitrile-butadiene-styrene (ABS)-like resin printed with stereo lithography apparatus (SLA) 3D printing are evaluated according to the viscosity of silicon oil lubricant using a ball-on-disk experiment. Lubricants with a viscosity of 500, 1000, and 2000 cSt are prepared for the experiment. If silicon oil lubricants are used during the ball-on-disk test, the coefficient of friction (COF) and wear rates are significantly reduced, and the higher the viscosity of the lubricant, the lower will be the COF and wear rates. It is also verified that the temperature of the specimen owing to friction also decreases according to the viscosity of the lubricant. This is because of the silicon oil film thickness, and the higher the viscosity of the lubricant, the thicker will be the oil film. More studies on the tribological characteristics of 3D printing materials and suitable lubricants will be required to use 3D printed parts as mechanical elements.

Frictional Characteristics of Silicon Surface with Micro-dimple Pattern (딤플 패턴이 있는 실리콘 표면의 마찰특성)

  • Yoo, Shin Sung;Heo, Yoon-Young;Kim, Dae-Eun
    • Journal of the Korean Society for Precision Engineering
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    • v.31 no.5
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    • pp.451-457
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    • 2014
  • Surface roughness of mechanical components is an important factor which affects the tribological phenomena. Various surface patterns have been applied to surfaces to improve the tribological characteristics of mechanical components. In this work, the friction reduction effect of micropatterns on silicon was investigated. For this purpose, micro-dimple patterns were fabricated on silicon wafer by DRIE process. In the friction experiments silicone oil was used as lubricant. Also, the lubricant was cleaned to simulate a lubricant depleted condition. In depleted lubricated condition, friction coefficient of micro-pattern specimens was lower than specimens without micro-patterns. It was found that friction reduction effect of micro-pattern could be successfully maintained even after cleaning the lubricant on the surface.

Industrial Applications of Si-based Ceramics

  • Eichler, Jens
    • Journal of the Korean Ceramic Society
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    • v.49 no.6
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    • pp.561-565
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    • 2012
  • Due to their unique combination of properties, Si-based ceramics, such as silicon carbide (SiC), silicon nitride ($Si_3N_4$) and silicon oxide ($SiO_2$ as fused silica), have a range of industrial applications in fields such as the chemical industry, aluminum manufacturing, oil and gas production and solar cell production. For each materials group, examples of typical applications from various industry sectors are presented while taking into account the property fingerprint.

A Study on The Surface Breakdown of Epoxy Composite in Silicon Oil (에폭시 복합체의 실리콘유중 연면파괴에 관한 연구)

  • 장인범;정인재;정일형;유재웅;오재한;김종헌;이준웅
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 1998.06a
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    • pp.195-198
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    • 1998
  • In this paper, we study on the surface breakdown of Epoxy composite in silicon oil. Breakdown field strengths were simulated by using FEM with the experience data of surface breakdown of Epoxy composite. The surface endurance and field distribution (kV/mm) of Epoxy composite were calculated by FEM.

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Recycling of Cutting Oil from Silicon Waste Sludge of Solar Wafer (태양광용 웨이퍼 실리콘 폐슬러지로부터 절삭유의 재생)

  • Um, Myeong-Heon;Lee, Jong-Jib;Ha, Beom Yong
    • Clean Technology
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    • v.22 no.4
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    • pp.274-280
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    • 2016
  • In this study, it was to develop a chemical method that can recycle the cutting oil which accounts for about 25% of the cost of the process among containing materials of silicon waste sludge generated in the process for producing a solar cell wafer. The 7 types of reagents have been used, including acetone, HCl, NaOH, KOH, $Na_2CO_3$, HF, $CH_2Cl_2$, etc. for this experiment. And It was carried out at a speed of 3000 rpm for 60 minutes centrifugation after performing a reaction with a waste sludge at various concentrations. As a result, the best reagents and conditions for separating the solid such as a silicon powder and a metal powder and liquid cutting oil were identified as 0.3 N NaOH. It is found to be pH 6.05 in a post-processing recycled cutting oil with 0.3 N NaOH after reaction of waste sludge and 0.1 N HCl which is effective to remove metal powder in order to adjust the pH to suit the properties of the weak acid is a commercially available cutting oil and it showed excellent turbidity than when applied to sludge with 0.3 N NaOH alone. The results of FT-IR analysis which can compare the properties of the commercially available cutting oil shows it has a possibility of recycling oil. The cutting oil recovery rate obtained through the experiment was found to be 86.9%.

Influence of Droplet Size and Oil Viscosity on the Descending Velocity of Droplets Using Water Model With and Without Stirring (교반 유무에 따른 수모델을 사용한 액적의 하강 속도에 대한 액적 크기 및 오일 점도의 영향)

  • Hyeok-In Kwon;Alberto Conejo;Sung Yong Jung;Sun-Joong Kim
    • Resources Recycling
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    • v.32 no.2
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    • pp.33-42
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    • 2023
  • Metal emulsions have been studied for several decades as a method of increasing the efficiency of the steelmaking process. This study was performed using a water model, observable at room temperature, to compensate for the disadvantages of the high-temperature experiment, the results of which are difficult to observe visually. As a substitute for metal-in-slag emulsions, experiments were conducted by dropping distilled water into silicone oil and comparing the results with the results of a calculation by momentum balance equations. The descending velocity of the water droplet decreased as the diameter of the droplet and viscosity of the fluid (silicon oil) increased. To simulate the descending velocity of a water droplet in silicon oil under stirring conditions, the flow rate of the fluid (silicon oil) was measured by particle image velocimetry (PIV) methods. The calculation of the descending velocity of the water droplet was in good agreement with the measured values, with and without stirring a viscous silicone oil.