• Title/Summary/Keyword: surface-coated

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Cutting Characteristics Comparison between CBN and Coated CBN Tools in Turning SCM440 (SCM440의 선삭가공시 CBN공구와 CBN코팅공구의 절삭특성 비교)

  • Bang, H.I.;Shin, H.G.;Oh, S.H.;Kim, T.Y.
    • Journal of the Korean Society of Mechanical Technology
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    • v.13 no.3
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    • pp.31-37
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    • 2011
  • The purpose of this study is to investigate cutting characteristics and wear behavior in SCM440 steel with different cutting tools, CBN(Cubic Boron Nitride) and coated CBN. During the test coated CBN tool especially with TiAlN showed better wear resistance behavior than orginal CBN tools. In the interrupted cutting condition, axial groove affected tool surface with impact force during the turning operation. For advantageous turning parameter in the interrupted process it is recommendable that lower speed. Also surface roughness showed better behavior in the coated CBN tool conditions than normal CBN conditions. Mainly this is caused by reduced friction between material and tool surface with coated layer.

A STUDY ON THE EFFECT OF PERMA CURE SYSTEM ON THE PHYSICAL PROPERTIES OF ACRYLIC RESIN SURFACES (광중합(光重合) 활택 경화제가 아크릴 레진 표면에 미치는 물리적 성질에 관한 연구)

  • Bae, Jeong-Sik;Lee, Ho-Yong;Chung, Moon-Kyu
    • The Journal of Korean Academy of Prosthodontics
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    • v.23 no.1
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    • pp.155-164
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    • 1985
  • Acrylic resin has some disadvantages in its physical properties such as a low surface hardness, being easily abraded as well as low degree of impact resistance. To overcome these disavantages, Perma Cure System was introduced in 1981, in which photo polymerizing monomers coated on acrylic resin surface were polymerized. In this study, to observe the effect of Perma Cure System on physical properties of treated surface of different types of acrylic resin, abrasion resistance, surface hardness and surface roughness of 4 different types of resin (Premium, Ortho-jet acrylic, Quick resin, Thermo jel) were tested before and after coating treatment. The conclusions arised from this study are as follows; 1. In all types of resin, the abrasion resistance of coated specimen was higher than that of uncoated specimen, and there was difference in amount of abrasion among the types of coated resin. 2. In all types of resin, the surface hardness of coated specimen was higher than that of uncoated specimen, and there was no difference in surface hardness among the types of coated resin. 3. In all types of resin, surface roughness of coated specimen was lower than that of uncoated specimen, and was different according to the degree of surface roughness before coating treatment in same sort of resin specimen.

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A Study on the bioactive surface modification of PEEK intervertebral fusion cage using various coating techniques (다양한 코팅 처리에 의한 PEEK 추간체유합보형재의 생체 활성 표면에 관한 연구)

  • Su-Bin Noh;Su-Zy Park;Mun-Hwan Lee
    • Journal of the Korean institute of surface engineering
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    • v.56 no.4
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    • pp.273-282
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    • 2023
  • In this study, the surface of Polyetheretherketone (PEEK) disks was modified to have a hydrophilic surface by applying a coating of Polyethylene glycol (PEG), Hyaluronic acid(HA), and Poly-Dopamine(PDA). The investigation aimed to examine whether the coated surfaces showed enhanced bioactivity for orthopedic applications compared to the pure PEEK. The microstructure, surface characteristics, and wettability of PEEK coated with PEG, HA, and PDA were analyzed using scanning electron microscopy(SEM), FT-IR spectrophotometer, Roughness Measurement System, Micro-Vickers, and Contact angle measurement. The mechanical properties were analyzed using a tensile testing machine, while the MTT assay for cell activity was analyzed using a microplate reader to measure optical density. According to the SEM and FT-IR results, the composition and crystal structure of PEG, HA and PDA coated surface were verified. Also, roughness, hardness, and contact angle were all improved in the coating group compared to the pure PEEK. We checked the HepG2 cell proliferation by using MTT assay on 7th days. In MTT assay results, HepG2 cell proliferation was increased with time, at 7 days, cell viability on discs coated with PDA was significantly higher than pure PEEK, PEG, HA coated group. PDA coated PEEK exhibited the highest surface roughness, hardness, contact angle, and cell activity. The mechanical properties were not affected by the presence of the coating.

Properties of Coated Paper and Printabilities by Surface Modification of Pigments for Papermaking

  • Cho, Jun-Hyung;Lee, Yong-Kyu;Lee, Yong-Won;Min, Dong-Jin;Kim, Yong-Sik
    • Proceedings of the Korea Technical Association of the Pulp and Paper Industry Conference
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    • 2006.06b
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    • pp.499-504
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    • 2006
  • To improve the quality of coating paper, many areas, such as the manufacturing process of inorganic pigment for the coating, the property change of coating color, the surface design of coating pigment and the productivity of coated paper, were studied. In this study the physical properties and printability of coated paper were compared with the coating pigment to modify the surface of large particle and the coating pigment to mix together the large and small particles. After the coating color was mixed under the same conditions in order that the coating color has the same printability, the printability change caused by the surface modification of coating color was investigated. With the surface SEM of coated paper, the efficiency of the surface modification of coating pigment was investigated. The physical property and printability of coated paper, in addition to the physical properties of coating color, were compared and evaluated. Also, the efficiency of printability was evaluated, changing the mixing condition.

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Manufacturing of High Quality Coated Paper using Environmental Friendly Plasma Technology(II) - Making coated paper using surface-treated base paper- (친환경 플라즈마 기술을 이용한 고품질 인쇄용지 제조 (제2보) - 표면처리된 원지를 이용한 도공지 제조 -)

  • Shin, Dong-Joon;Kim, Sun-Kyung;Lee, Yong-Kyu
    • Journal of Korea Technical Association of The Pulp and Paper Industry
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    • v.44 no.1
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    • pp.31-36
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    • 2012
  • In the previous study, the possibility of modifying the surface properties of base paper with plasma treatment was evaluated. It was shown that only the hydrophilic properties of the base paper surface was increased while there was no changes in physical and optical properties. Only the surface of the plasma treated side was modified. In this study, the effect of plasma treatment on binder migration was elucidated. The base paper was plasma treated with various voltage and then the plasma treated base papers were coated with varying coated weight. The surface strength of the coated paper (dry and wet pick) was increased with plasma treatment, which implies that the plasma treatment of base paper can inhibit the binder migration.

The Local Surface Strength Variation of Coated Papers during Printing (인쇄과정에서 코팅 용지의 국부적인 표면강도 변화에 관한 연구)

  • Youn, Jong-Tae
    • Journal of the Korean Graphic Arts Communication Society
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    • v.22 no.2
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    • pp.101-110
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    • 2004
  • The local surface strength variation of coated papers were measured at various speeds on a number of coated paper samples to study the effects of speed and ink tack on coating pick. Coating pick phenomenon is observed in an ink transfer variation curve as a decrease in the slope of the curve. On the other hand, it causes an actual decrease in net ink transfer to paper with an increase in speed. The effect of speed on coating pick depends on ink tack, ink film thickness and surface properties of coating layer formation of paper. A novel device to measure the surface strength can rate the coating paper in a different order. Comparison are made between dry test of coating paper pick and wet coating pick test of printing in IGT printability tester. Coating formulation is the main key to prevent from coating pick. The binder level increases, the coating pick and the slop decrease. The piling on blanket in printing is a problem when the coating pick is occur on a local area rather than average surface strength of coated papers.

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Effect of Nitrogen Gas Pressure on the Property of TiN-Coated Layer of High Speed Steel by Arc ion Plating (AIP 법에서 질소가스 압력이 고속도강의 TiN 코팅층 성질에 미치는 영향)

  • Kim, Hae-Ji;Joun, Man-Soo
    • Journal of the Korean Society for Precision Engineering
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    • v.25 no.7
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    • pp.124-130
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    • 2008
  • The effect of nitrogen gas pressure in arc ion plating on surface properties of the TiN-coated high speed steel(SKH51) is presented in this paper. The surface roughness, micro-particle, micro-hardness, coated thickness, atomic distribution of TiN, and adhesion strength are measured fur various nitrogen gas pressures. It has been shown that the nitrogen gas pressure has a considerable effect on the surface roughness, adhesion strength, atomic distribution of TiN, and surface deposition of TiN of the high speed steels but that it has little influence on the micro-hardness and coated thickness.

Physical Characteristics of Concrete Coated High Performance Surface Penetration Agency (고성능 표면침투제가 도포된 콘크리트의 물리특성)

  • Yoo, Sung-Won;Suh, Jeong-In;Ha, Hyun-Jae;Lee, Sang-Min;Lee, Sang-Guen
    • Proceedings of the Korea Concrete Institute Conference
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    • 2004.11a
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    • pp.809-812
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    • 2004
  • The evaluation of characteristics of concrete coated by high performance surface penetration agency was examined through various tests, i.e., compressive strength, penetration depth, water and air permeability, absorption according to various high performance surface penetration agencies and various compressive strengths of base concrete. The 4 types of high performance surface penetration agencies were used i.e., organic, inorganic, water soluble, and alcohol soluble. And 3 types of compressive strength of base concrete were used such as 21, 24 and 30 MPa. The characteristics of concrete coated high performance surface penetration agency was more improved than that of non-coated concrete, and especially, water soluble inorganic agency was most effective. And if compressive strength of base concrete was low, the improved effects would be larger.

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CLINICAL STUDY OF ENDOSSEOUS HYDROXYAPATITE COATED IMPLANTS (수종의 Hydroxyapatite coated 골유착성 임프란트의 임상적 연구)

  • Han, Chong-Hyun;Kim, Sung-Hyun;Chul, Jong-Young
    • The Journal of Korean Academy of Prosthodontics
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    • v.38 no.5
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    • pp.631-639
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    • 2000
  • Root-form endosseous implants which are in use today have a variety of materials, designs and surface characteristics. Among them, pure titanium surface implants and titanium matrix coated with HA are popular as well as are available in many studies. Rate of clinical success is obviously lower in jaw with cancellous bone than dense bone. In order to increase the rate of success in poor bone quality. More advanced techniques of implant surgery and surface treatment of implant fixture body have been developed. As a successful result, the installation of HA coated implant in bone quality type III or IV became highly successful. Since most clinical studies were performed without knowing the characteristics of HA coated implants, it has been impossible to come up with proper clinical data. Therefore the characterization of HA coated implants is essential to understand long term clinical performance and the predictability of HA coated implant system Our results showed that HA coated implants had the success rate at 93.7% in bone quality type III, IV for 3.8 years, and the fixture of Steri-Oss showed more stability with time.

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DETORQUE FORCE OF TiN-COATED ABUTMENT SCREW WITH VARIOUS COATING THICKNESS AFTER REPEATED CLOSING AND OPENING

  • Kim, Han-Su;Kim, Hee-Jung;Chung, Chae-Heon
    • The Journal of Korean Academy of Prosthodontics
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    • v.45 no.6
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    • pp.769-779
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    • 2007
  • Statement of problem. When TiN coating is applied to the abutment screw, occurrence of greater preload and prevention of the screw loosening could be expected due to decrease of frictional resistance. However, the proper thickness of TiN coating on abutment screw has not been yet reported. Purpose. The purpose of this study is to find out the appropriate TiN coating thickness by evaluating the detorque force and the surface change of titanium abutment screw with various TiN coating thickness. Material and methods. 1. Material Thirty five non-coated abutment screws were prepared for TiN coating. TiN coatings were prepared by Arc ion plating method. Depending on the coating deposition time(CDT), experimental groups were divided into 6 groups(CDT 30min, 60min, 90min, 120min, 150min, 180min) and those of 1 group was not coated as a control group. Each group was made up of 5 abutment screws. 2. Methods FE-SEM(Field Emission Scanning Electron Microscoper) and EDX(Energy Dispersive X-ray Spectroscopy) were used to observe the surface of the abutment screw. Electric scales was used to measure the weight of the abutment screw after the repeated closing and opening of 10 trials. Detorque force was measured with digital torque gauge, at each trial. Results. 1. As the coating deposition time increased, the surface became more consistent and smooth. 2. As for the abutment screws that were TiN coated for more than 60 minutes, no surface change was found after the repeated closing and opening. 3. The TiN coated abutment screws showed less weight change than the non-coated abutment screws. 4. The TiN coated abutment screws showed higher mean detorque force than the noncoated abutment screws. 5. The abutment screw coated for 60 minutes showed the highest mean detorque force. Conclusion. The coating layer of proper thickness is demanded to obtain consistent and smooth coating surface, resistance to wear, and increased detorque force of the abutment screw. In conclusion, the coating deposition time of 60 minutes indicated improved mechanical property, when TiN coating was conducted on titanium abutment screw.