• 제목/요약/키워드: abrasion resistance

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신발겉창 재료용 열가소성 폴리우레탄 (TPU)/에틸렌-프로필렌-디엔 고무와 TPU/부타디엔 고무 블렌드 (Thermoplastic Polyurethane (TPU)/Ethylene-Propylene-Diene Monomer Rubber (EPDM) and TPU/Polybutadiene Rubber (BR) Blends for the Application of Footwear Outsole Materials)

  • 김지후;김규현
    • Elastomers and Composites
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    • 제48권3호
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    • pp.195-200
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    • 2013
  • 본 연구의 주요 목적은 신발 겉창 재료로 사용하기 위하여 열가소성 폴리우레탄 (TPU)의 내마모성과 습윤시의 내슬립성을 에틸렌-프로필렌-디엔 고무 (EPDM) 또는 폴리부타디엔 고무 (BR)를 블렌드하여 향상시키는 것이다. 10 wt%의 EPDM 또는 BR이 TPU에 투입되었을 때 TPU/EPDM과 TPU/BR 블렌드는 TPU보다 우수한 NBS 내마모도, 인장 물성 그리고 습윤 내슬립성을 보였다. 10 wt% 이상 투입될 때는 내마모도와 인장 물성 모두 감소하였다. 10 wt% 투입시의 내마모도와 인장물성 상승은 TPU의 상분리도 증가에 기인하는 것으로 보인다.

RF 마그네트론 스퍼터링에 의해 실리콘이 증착된 메타아라미드 직물의 성질 분석 (Properties of Silicon-deposited Meta-aramid Fabrics by RF Magnetron Sputtering)

  • 박종현;이선영;김춘수;강송희;김의화;이승구
    • 한국염색가공학회지
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    • 제29권1호
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    • pp.18-24
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    • 2017
  • Meta-aramid fabric has been widely used as the reinforcement of composites due to its high flame resistance and tearing strength. Functionality such as abrasion resistance of fabric is very important for specialty fabrics used in car racing suits. In this study, to improve abrasion resistance property of meta-aramid fabric, silicon deposition was conducted by utilizing RF magnetron sputtering. The sputtering process parameters effects were investigated as sputtering power and substrate temperature. The obtained results suggest that the silicon deposition on the meta-aramid fabric has obvious effect upon increasing the abrasion resistance, the thermal insulation and the electric resistance condition for silicon deposition was established. In conclusion, the results of this study have made it possible to manufacture meta-aramids with higher abrasion strength.

Effect of Silica Fume and Slag on Compressive Strength and Abrasion Resistance of HVFA Concrete

  • Rashad, Alaa M.;Seleem, Hosam El-Din H.;Shaheen, Amr F.
    • International Journal of Concrete Structures and Materials
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    • 제8권1호
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    • pp.69-81
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    • 2014
  • In this study, portland cement (PC) has been partially replaced with a Class F fly ash (FA) at level of 70 % to produce high-volume FA (HVFA) concrete (F70). F70 was modified by replacing FA at levels of 10 and 20 % with silica fume (SF) and ground granulated blast-furnace slag (GGBS) and their equally combinations. All HVFA concrete types were compared to PC concrete. After curing for 7, 28, 90 and 180 days the specimens were tested in compression and abrasion. The various decomposition phases formed were identified using X-ray diffraction. The morphology of the formed hydrates was studied using scanning electron microscopy. The results indicated higher abrasion resistance of HVFA concrete blended with either SF or equally combinations of SF and GGBS, whilst lower abrasion resistance was noted in HVFA blended with GGBS.

Permeability and abrasion resistance of concretes containing high volume fine fly ash and palm oil fuel ash

  • Homwuttiwong, S.;Jaturapitakkul, C.;Chindaprasirt, P.
    • Computers and Concrete
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    • 제10권4호
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    • pp.349-360
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    • 2012
  • In this paper, compressive strength, water permeability and abrasion resistance of concretes containing high volume fine fly ash (FFA) and fine ground palm oil fuel ash (GPA) were studied. Portland cement type I was replaced with FFA and GPA at dosages up to 70% by weight of binder. Ground river sand (GRS) was also used to replace Portland cement in order to indicate the level of filler effect. Results indicated that FFA was slightly more reactive than GPA. The replacement of 40-70% of FFA produced concretes with compressive strength, permeability and abrasion resistance comparable to those of normal concretes. The incorporation of GPA slightly reduced the performances of concretes as compared to those of FFA concretes. The reduction of Portland cement was partly compensated by the increase in pozzolanic activity of the fine fly ash and palm oil fuel ash and thus enabled the large replacement levels.

Investigation of steel fiber effects on concrete abrasion resistance

  • Mansouri, Iman;Shahheidari, Farzaneh Sadat;Hashemi, Seyyed Mohammad Ali;Farzampour, Alireza
    • Advances in concrete construction
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    • 제9권4호
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    • pp.367-374
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    • 2020
  • Concrete surfaces, industrial floors, sidewalks, roads and parking lots are typically subjected to abrasions. Many studies indicated that the abrasion resistance is directly related to the ultimate strength of the cured concrete. Chemical reactions, freeze-thaw cycles, and damages under abrasion are among many factors negatively affecting the concrete strength and durability. One of the major solutions to address the abrasive resistance of the concrete is to use fibers. Fibers are used in the concrete mix to improve the mechanical properties, strength and limit the crack propagations. In this study, implementation of the steel fibers in concrete to enhance the abrasive resistance of the concrete is investigated in details. The abrasive resistance of the concrete with and without steel fibers is studied with the sandblasting technique. For this purpose, different concrete samples are made with various hooked steel fiber ratios and investigated with the sandblasting method for two different strike angles. In total, 144 ASTM verified cube samples are investigated and it is shown that those samples with the highest steel fiber ratios have the highest abrasive resistance. In addition, the experiments determine that there is a meaningful correlation between the steel fiber percentage in the mix, strike angle and curing time which could be considered for improving structural behavior of the fiber-reinforced concrete.

고크롬 철계 오버레이용접층의 긁힘마모거동에 미치는 크롬탄화물 양의 영향 (Effect of Volume Fraction of Cr Carbide Phase on the Abrasive Wear Behavior of the High Cr White Iron Harcfacing Weld Deposits)

  • 백응률
    • Journal of Welding and Joining
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    • 제16권1호
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    • pp.125-133
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    • 1998
  • The effect of volume fraction of Cr carbide phase (Cr CVF) on the low stress abrasion resistance in the chromium-carbide-type high Cr white iron hardfacing weld deposits has been investigated. In order to examine Cr CVF, a series of alloys with varying Cr CVF by changing chromium and carbon contents and the ratio of Cr/C were employed. The alloys were deposited once or twice on a mild steel plate using the self-shielding flux cored arc welding process. The low stress abrasion resistance of the alloys against sands was measured by the Dry Sand/Rubber Wheel Abrasion Test (RWAT). It was shown that hardness and abrasion resistance increased with increasing Cr CVF within the whole test range (Cr CVF : 0.23-0.64). Both primary Cr carbide and eutectic Cr carbide were particularly effective in resisting wear due to their high hardness.

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Abrasion and Impact Wear Resistance of the Fe­based Hardfacing Weld by Dispersing the Recycled WC

  • Kang, N.H.;Chae, H.B.;Kim, J.K.;Kim, J.H.
    • International Journal of Korean Welding Society
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    • 제3권2호
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    • pp.1-6
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    • 2003
  • The abrasion and impact wear resistance were investigated on the hardfacing weld dispersed with the recycled hard metal(HM). The HM was composed of the tungsten carbide(WC) reinforced metal matrix composite. The cored wire filled with the 35 wt.% HM and 0­6 wt.% of the alloying element, Fe­75Mn­7C(FeMnC), was used for the gas metal arc(GMA) welding. The FeMnC addition to the 35 wt.% HM did not improve the abrasion wear property since the amount of the tungsten carbide formed was decreased with respect to the FeMnC amount. However, the 6 wt.% FeMnC addition to the 35 wt.% HM exhibited the better impact wear resistance than the hardfacing weld by the 40 wt.% HM.

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Improved Corrosion and Abrasion Resistance of Organic-Inorganic Composite Coated Electro-galvanized Steels for Digital TV Panels

  • Jo, Du-Hwan;Noh, Sang-Geol;Park, Jong-Tae;Kang, Choon-Ho
    • Corrosion Science and Technology
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    • 제14권5호
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    • pp.213-217
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    • 2015
  • Recently, household electronic industries require environmentally-friendly and highly functional steels in order to enhance the quality of human life. Customers especially require both excellent corrosion and abrasion resistant anti-fingerprint steels for digital TV panels. Thus POSCO has developed new functional electro-galvanized steels, which have double coated layers with organic-inorganic composites on the zinc surface of the steel for usage as the bottom chassis panel of TVs. The inorganic solution for the bottom layer consists of inorganic phosphate, magnesium, and zirconium compounds with a small amount of epoxy binder, and affords both improved adhesion properties by chemical conversion reactions and corrosion resistance due to a self-healing effect. The composite solution for the top layer was prepared by fine dispersion of organic-inorganic ingredients that consist of a urethane modified polyacrylate polymer, hardener, silica sol and a titanium complex inhibitor in aqueous media. Both composite solutions were coated on the steel surface by using a roll coater and then cured through an induction furnace in the electro-galvanizing line. New anti-fingerprint steel was evaluated for quality performance through such procedures as the salt spray test for corrosion resistance, tribological test for abrasion resistance, and conductivity test for surface electric conductance regarding to both types of polymer resin and coating weight of composite solution. New composite coated anti-fingerprint steels afford both better corrosion resistance and abrasion properties compared to conventional anti-fingerprint steel that mainly consists of acrylate polymers. Detailed discussions of both composite solutions and experimental results suggest that urethane modifications of acrylate polymers of composite solutions play a key role in enhanced quality performances.

Cure Characteristics, Mechanical Properties and Abrasion Resistance of Silica Filled Natural Rubber Vulcanizate

  • Lee, Hae Gil;Park, Chan Young
    • Elastomers and Composites
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    • 제50권3호
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    • pp.159-166
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    • 2015
  • Silica which is used for reinforcing filler in tire industry is widely known as eco-friendly material exerting $CO_2$ reduction effect through decrease of rolling resistance and improvement of wet grip. Generally silica is classified as a highly polar filler because it contains a large number of silanol (Si-OH) group on its surface. And also silica gives a lower reinforcing effect than carbon black due to its poorer rubber-filler interaction. Therefore silica is treated with silane coupling agent or activator, then following the conventional rubber blend method, vulcanized sheets were prepared using a hot press, and cure characteristics, mechanical properties and abrasion resistance of the test specimens were investigated. It was found that with an increase in the silane coupling agent content the tensile strength, 300% modulus and abrasion resistance increased while Mooney viscosity decreased and crosslink density slightly increased with an increase of activator.

유연제 및 열처리에 따른 신발용 경편성물의 마모 및 역학 특성 변화 (Changes on the Abrasion and Mechanical Properties of Warp Knitted Fabric for Footwear with Softeners and Heat Treatments)

  • 전연희;구자길;정원영;안승국
    • 한국의류산업학회지
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    • 제12권4호
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    • pp.494-499
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    • 2010
  • Knitted fabrics are very popular for their numerous advantages such as greater comfort, attractive garment appearance, better fit on the body, etc. In this study, we investigated the mechanical properties and abrasion property of warp knitted fabrics for footwear which treated with several softeners to improve abrasion resistance. The antistatic softener among the various softeners showed high improvement in abrasion resistance. Among the mechanical properties with treating conditions, WT (tensile energy), G (shear stiffness), B (bending rigidity) increased as treating timeincreased. But the other mechanical properties were little changed with treating concentration.