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자기력이 철 분말 및 탄소나노튜브 강화 자기유동 고무 복합재료의 유동 및 압축 특성에 미치는 영향
류상렬(Sang Ryeoul Ryu),이동주(Dong Joo Lee) 대한기계학회 2013 大韓機械學會論文集A Vol.37 No.2
고무 혼합물의 가류특성 및 전자석 장치를 이용하여 범용고무를 기지로 하는 이방성 자기유동 고무 복합재료(MRRC)의 제조가 가능하였다. 철 입자(IP) 함유량의 증가에 따라 MRRC의 자기 투과율은 증가하였으며, 불규칙 배향에 비해 2 tesla로 배향시킨 경우가 1.8~2배 높게 나타났다. 2 tesla로 배향한 CNT만 강화한 MRRC의 자기 투과율은 3.7%로 자기장의 영향이 뚜렷이 확인되었다. IP 90 + CNT 5 & 2 tesla 배향의 MRRC는 압축시험 시 0.49 tesla의 자기장 하에서 압축응력이 기지에 비해 2.1배 증가하였다. IP 함유량 증가에 따라 자기유동(MR) 효과는 증가하였으며, IP 90 & 2 tesla 배향의 경우 20.4%의 MR 효과를 보였다. 시험편 제조 시 및 압축시험 시 부여한 자기력 세기가 MRRC의 압축특성에 미치는 영향이 크다고 판단된다. An orthotropic magneto-rheological rubber composite (MRRC) based on a general-purpose rubber can be manufactured by using an electromagnetic device during the curing processes of rubber mixtures. The magnetic transmissivity of MRRCs increases with the iron particle (IP) content, and that of aligned MRRCs with a 2-T magnetic field is 1.8 to 2 times higher as compared to that of randomly dispersed MRRCs. The effect of a 2-T magnetic field on carbon nanotube (CNT) reinforced MRRC has been identified clearly, and the magnetic transmissivity is found to be 3.7%. The compressive stress of MRRC (IP 90 + CNT 5, 2 T alignment) under a magnetic field of 0.49 T is 2.1 times higher as compared to that of the matrix. The MR effect of MRRC increases with the IP content, and that of aligned MRRC with the IP 90 and 2 T magnetic field is 20.4%. It is confirmed that the magnetic field when making the specimen and when performing the compression test greatly impacts the compression characteristics.
글라스 비드 크기 및 표면처리가 실리콘 고무복합재료의 압축 및 응력완화 특성에 미치는 영향
류상렬(Sang Ryeoul Ryu),이동주(Dong Joo Lee) 대한기계학회 2012 대한기계학회 춘추학술대회 Vol.2012 No.11
The effects of ES (epoxy silane) content, GB (glass bead) diameter, and surface treatments with the atmospheric pressure flame plasma (APFP) and ES are experimentally investigated for the compressive and stress relaxation properties of GB (40phr) reinforced rubber composites. The optimal content of the ES for composites is 1 phr. There is no big difference for the compressive stress and modulus of composites when the ES exceeds 1 phr. The stress and modulus of the rubber composites are increased with increasing diameter, and the composite with APFP treatment shows the highest increasing rate. The stress and modulus of the composite with the APFP treated GB (700㎛) and ES are increased 3.4 times and 2.7 times, respectively, when compare to the matrix. The stress-relaxation degree of the matrix is 0.58N/s for 3minutes when the load is 400N, and that of the composite is remarkably decreased with increasing diameter. The stress-relaxation degree of the composite with the APFP treated GB (700㎛) and ES is decreased 70% level of the matrix. It is found that the ES content, GB diameter, and surface treatments have an important effect on compressive and stress relaxation properties of rubber composites.
다양한 종류의 상압 플라즈마 처리에 의한 알루미늄과 고무의 접착특성 연구
류상렬(Sang-Ryeoul Ryu),이동주(Dong-Joo Lee) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.11
To increase the adhesive properties of the acrylonitrile butadiene rubber and aluminum plate, various atmospheric pressure plasma(APP) treatments are applied. For the case of atmospheric pressure flame plasma(APFP) treatment, the optimum distance between burner port and aluminum plate is 40 ㎜ and the optimum processing velocity of the burner port is 50m/min. among three different conditions. When the surface is coated twice with the bonding agent, the adhesion strength of APFP treated aluminum plate is increased to about 29.3%. It was found that the surface modification of aluminum by flame plasma treatment is a fast, economic and applicable method to improve the adhesion strength between rubber and aluminum when compared to other plasma treatments.
상압 플라즈마 처리가 직물과 고무의 접착특성에 미치는 영향
류상렬(Sang-Ryeoul Ryu),이동주(Dong-Joo Lee) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
In order to increase the adhesion properties between a polyamide woven fabrics and nitrile butadiene rubber, the atmospheric plasm treatment(APT) device was used. The optimum number of APT at given conditions is 2 times. The deformation of the fabric is more serious with increasing the number of APT. The adhesion strength of the case with APT fabric is increased about 30% when compare to the case with non-APT one. The adhesion energy and fracture toughness of the case with APT fabric are increased 4.0 times, 2.2 times for the interface(bonding agent two coatings) when compare to the case with non-APT one, respectively. Overall, it was found that the APT for woven fabric have an important effect upon adhesion properties.