• 제목/요약/키워드: Glass content

검색결과 835건 처리시간 0.022초

VARTM 법으로 제작한 탄소-유리/에폭시 하이브리드 적층재의 인장 특성 (Tensile Properties of Carbon-Glass/Epoxy Hybrid Laminates Produced by VARTM)

  • 김연직
    • 대한금속재료학회지
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    • 제49권10호
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    • pp.760-765
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    • 2011
  • This paper presents a study of the tensile behavior of carbon and glass fiber reinforced epoxy hybrid laminates manufactured by vacuum assisted resin transfer molding (VARTM). The objective of this study was to develop and characterize carbon fiber reinforced plastic hybrid composite material that is low cost and light-weight and that possesses adequate strength and stiffness. The effect of position and content of the glass fabric layer on the tensile properties of the hybrid laminates was examined. The strength and stiffness of the hybrid laminates showed a steady decrease with an increase of the glass fabric content this decrease was almost linear. Fracture strain of these laminates showed a slight increasing trend when glass fabric content was increased up to 3 layers, but at a glass fabric content > 3 layers the strain was almost constant. When glass fabric layers were at both outer surfaces, the hybrid laminate exhibited a slightly higher tensile strength and elastic modulus due to the small amount of glass yarn pull-out.

폐유리를 혼입한 강섬유보강 콘크리트의 물리ㆍ역학적 특성에 관한 실험적 연구 (An Experimental Study on Physical and Mechanical Properties of Steel Fiber Reinforced Concrete Containing Waste Glass)

  • 박승범;이봉춘;조광연;이택우
    • 한국콘크리트학회:학술대회논문집
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    • 한국콘크리트학회 2002년도 봄 학술발표회 논문집
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    • pp.903-908
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    • 2002
  • The production of waste glasses has been increased with the development of industry. The utilization of waste glass for concrete can cause the concrete to be cracked and to be weakened due to an expansion by alkali-silica reaction(ASR). When used the fibers with waste glass, there is an effect on reduction of expansion and strength loss due to ASR between the alkali in the cement paste and the silica in the waste glass. In this study, we conducted basic experimental research to analyze the possibilities of recycling of amber waste glass as fine aggregates for steel fiber reinforced concrete. Test results of fresh concrete. slump is decreased because grain shape is angular and air content is increased due to involving small size particles so much in waste glasses. Also. tensile and flexural strengths increased as the content of steel fibers increased. In conclusion, the content of waste glass below 40% is reasonable and usage of pertinent admixture is necessary to obtain workability or air content.

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폐유리를 혼입한 섬유보강 콘크리트의 알카리-실리카 반응에 관한 실험적 연구 (An Experimental Study on Alkali-Silicate Reaction of Fiber Reinforced Concrete Containing Waste Glass)

  • 이봉춘;이택우;권혁준;이준;박승범
    • 한국콘크리트학회:학술대회논문집
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    • 한국콘크리트학회 2001년도 봄 학술발표회 논문집
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    • pp.49-54
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    • 2001
  • Using waste glass in concrete can cause crack and strength loss by the expansion of alkali-silica reaction(ASR). In this study, ASR expansion and properties of strength were analyzed in terms of brown waste glass content, and fibers(steel fiber, polypropylene fiber) and fiber content for reduction ASR expansion due to waste glass. In this accelerated ASTM C 1260 test of waste glass, pessimum content can not be found. Also, when used the fibers with waste g1ass, there is an effect on reduction of expansion and strength loss due to ASR between the alkali in the cement paste and the silica in the waste glass. Specially, adding 1.5 vol.% of steel fiber to 20% of waste glass the expansion ratio was reduced by 40% and flexural strength was developed by up to 110% comparing with only Waste glass ( $80^{\circ}C$ $H_{2}$ O curing).

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Effect of the Oxide Glass on the Metal Sintering Behavior in Silver Thick-Film System

  • ;김호기
    • 한국세라믹학회:학술대회논문집
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    • 한국세라믹학회 1986년도 Priceedings Of The Third Korea-Japan Seminar On New Ceramics
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    • pp.259-267
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    • 1986
  • The sintering behavior of silver-oxide glass composite thick-film has been studied with varing glass content. It is shown that during heat treatment glass became liquid phase to deeply affect the microstructure development of the silver particles and to control the physical properties of the thick-films. As glass content increased, the initial repacking of silver particles took place rapidly but the homogeneities of the microstructure showed different features. When the glass content was over some range, the silver particles exuded glass to decrease net energy and glass formed liquid pools separated from the solid skeletons. Finally the relations between the microstructures and electrical properties of the thick-film were discussed.

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Bi2O3-Al2O3-SiO2 유리의 열물성과 내플라즈마 특성 연구 (A Study on the Thermal Properties and Plasma Resistance of Bi2O3-Al2O3-SiO2 Glass)

  • 변영민;최재호;임원빈;김형준
    • 반도체디스플레이기술학회지
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    • 제22권1호
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    • pp.64-71
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    • 2023
  • In this study, we investigated the effects of BiAlSiO glass composition on its glass forming range, thermal properties, and plasma resistance. The results showed that increasing the Al2O3 content suppressed the tendency for crystallization and hindered glass formation beyond a certain threshold. Bi2O3 was found to increase the content of non-bridging oxygen, resulting in a decrease in glass transition temperature and an increase in thermal expansion coefficient. Furthermore, the etching rate was found to improve with increasing Al2O3 content but decrease with increasing SiO2 content. It was concluded that the boiling point of fluorinated compounds should be considered to 900℃. Therefore, this study is expected to contribute to the understanding of the properties of BiAlSiO glass and its application to low temperature melting PRG compositions.

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Glass Transition Temperature of Honey Using Modulated Differential Scanning Calorimetry (MDSC): Effect of Moisture Content

  • Kim, Mi-Jung;Yoo, Byoung-Seung
    • Preventive Nutrition and Food Science
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    • 제15권4호
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    • pp.356-359
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    • 2010
  • Glass transition phenomena in nine Korean pure honeys (moisture content 18.3~20.1%) and honey-water mixtures by different water contents (0, 2, 5, and 10% w/w) were investigated with modulated different scanning calorimetry (MDSC). The total, reversing, and non-reversing heat flows were quantified during heating using MDSC. Glass transition was observed from reversing heat flow separated from the total heat flow. The glass transition temperatures ($T_g$) of pure honeys, which are in the range of $-42.7^{\circ}C$ to $-50.0^{\circ}C$, varied a lot with low determination coefficient ($R^2$=0.63), whereas those of honey-water mixtures decreased with a decrease in honey content. The $T_g$ values were also more significantly different among honey-water mixtures when compared to pure honeys, indicating that in the honey-water mixture system the $T_g$ values appear to be greatly dependent on moisture content. The measured heat capacity change (${\Delta}C_p$) was not influenced by moisture content.

Glass Fiber로 강화된 Nylon 6,6 / Ionomer 블렌드의 물리적 특성 (Physical Properties of Glass Fiber Reinforced Nylon 6,6 and lonomer Blends)

  • 박광석;서광석
    • 한국전기전자재료학회:학술대회논문집
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    • 한국전기전자재료학회 1999년도 춘계학술대회 논문집
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    • pp.536-539
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    • 1999
  • Physical properties of glass fiber-reinforced nylon 6,6 and ionomer blends were investigated in variation of ionomer and glass fiber content. With the increase of ionomer content, tensile strength, impact strength and flexural strength decreased, whereas increasing glass fiber content, these properties were improves. Both permittivity and tan $\delta$ remain unchanged. Space charge distribution was investigated by PEA (Pulsed electroacoustic) method. Heterocharge was found in nylon 6,6 and 히ass fiber composites, whereas composites, whereas when ionomer is blended.

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전기집진장치로부터 단별채취한 플라이 애쉬의 수열반응성 (Hydrothermal Reactivity of Various Classified Fly Ashes by Electrostatic Precipitator)

  • 이승헌
    • 한국세라믹학회지
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    • 제37권8호
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    • pp.811-816
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    • 2000
  • This paper discussed hydrothermal reactivity of Ca(OH)2 and classified bituminous fly ashes which were collected at an electrostatic precipitator in coal fired power plant at 181$^{\circ}C$. The major products of hydrothermal reaction were tobermorite and hydrogrossularite because bituminous fly ashes contained Al2O3 content greater than 20 wt%. As increasing amount of Al2O3 content greater than 20 wt%. As increasing amount of Al2O3 in glass phases, formation of hydrogrossularite increased. Formation rate of crystalline tobermorite increased with content of finer particles, higher glass content and more Al2O3 in glass phases. There was a positive correlation between residue on 45${\mu}{\textrm}{m}$ sieve and hydrothermal reactivity of fly ash up to 3 hours. The hydrothermal reactivity of fly ash at 181$^{\circ}C$ for 12 hours was more affected by fineness than by glass content of fly ash.

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Zr기지 비정질 합금 스크랩의 비정질 형성능 및 기계적 성질에 미치는 산소함량의 영향 (The Effect of Oxygen Content on the Glass Forming Ability and Mechanical Properties of the Zr-based Amorphous Alloy Return Scrap)

  • 김성규;이병철;박흥일
    • 한국주조공학회지
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    • 제35권4호
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    • pp.75-79
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    • 2015
  • Commercial Zr-based amorphous alloy was recycled and oxygen was introduced during the recycling process. The oxygen content can have a great effect on the glass forming ability and the mechanical properties of the alloy. Therefore, it was closely examined. The initial oxygen content in the raw material was 1,244 ppm. It was increased to 3,789 ppm in the alloy after ten recycling processes. As the recycling processes were repeated, the oxygen content increased. Specifically, after four recycling processes, it increased sharply as compared to that after three recycling processes. After ten recycling processes, the glass transition temperature (Tg) increased from 613 K to 634 K and the crystallization temperature (Tx) increased from 696 K to 706 K. On the other hand, the super-cooled liquid region (${\Delta}T=Tx-Tg$) decreased slightly from 83 K to 72 K while the reduced glass transition temperature (Trg = Tg/Tm) was 0.63, remaining constant even when the oxygen content was increased. These results indicated that the increased oxygen content deteriorated the glass forming ability. The bending strength as determined in a three-point bending test showed a sharp decrease from 3,055 to 2,062 MPa as the oxygen content was increased from 1,244 ppm to 3,789 ppm; the extension was also decreased from 3.02 to 1.74 mm. These findings meant that the alloy became brittle.

폐 유리의 가수 분해반응에 의한 발포유리의 제조(I) - 폐유리의 가수분해 반응 - (Production of Foamed Glass by Using Hydrolysis of Waste Glass (I) - Hydrolysis of Waste Glass -)

  • 이철태;이홍길
    • 공업화학
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    • 제16권4호
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    • pp.519-526
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    • 2005
  • 소다석회 조성의 폐 유리를 발포유리의 원료로 활용하기 위해 폐유리의 가수분해를 시도하였다. 소다석회유리 조성으로 만들어진 판유리 및 병 유리 등은 공히 가압 하에서 증기상의 물 또는 액체상의 물에 의해 효율적으로 가수분해가 진행되었다. 최적의 가수분해의 조건은 공히 $250^{\circ}C$, 2 h이었으며 이 조건하에 얻어진 수화유리의 함수율은 발포유리의 원료유리로서 발포화가 가능한 7.85~10.04%였다. 수식제인 Na성분은 액상의 물에 의한 가수 분해에 효율적이며 유시시료에 대한 중량비로서 0.04첨가 시 가장 높은 함수율을 지닌 수화유리가 얻어졌다.