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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Korean Ceramic Society
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Journal DOI :
The Korean Ceramic Society
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Volume & Issues
Volume 34, Issue 12 - Dec 1997
Volume 34, Issue 11 - Nov 1997
Volume 34, Issue 10 - Oct 1997
Volume 34, Issue 9 - Sep 1997
Volume 34, Issue 8 - Aug 1997
Volume 34, Issue 7 - Jul 1997
Volume 34, Issue 6 - Jun 1997
Volume 34, Issue 5 - May 1997
Volume 34, Issue 4 - Apr 1997
Volume 34, Issue 3 - Mar 1997
Volume 34, Issue 2 - Feb 1997
Volume 34, Issue 1 - Jan 1997
Volume 3, Issue 3 - 00 1997
Volume 3, Issue 2 - 00 1997
Volume 3, Issue 1 - 00 1997
Selecting the target year
Estimation of Interfacial Adhesion through the Micromechanical Analysis of Failure Mechanisms in DLC Film
정증현 ; 박해석 ; 안정훈 ; 권동일 ;
Journal of the Korean Ceramic Society, volume 3, issue 2, 1997, Pages 73~73
In this paper, it is intended to present more reproducible and quantitative method for adhesion assemssement. In scratch test, micromechanical analysis on the stress state beneath the indenter was carried out considering the additional blister field. The interface adhesion was quantified as work of adhesion through Griffith energy approach on the basis of the analyzed stress state. The work of adhesion for DLC film/WC-Co substrate calculated through the proposed analysis shows the identical value regardless of distinctly different critical loads measured with the change of film thickness and scratching speed. On the other hand, uniaxial loading was imposed on DCL film/Al substrate, developing the transverse film cracks perpendicular to loading direction. Since this film cracking behavior depends on the relative magnitude of adhesion strength to film fracture strength, the quantification of adhesion strength was given a trial through the micromechanical analysis of adhesion-dependence of film cracking patterns. The interface shear strength can be quantified from the measurement of strain εs and crack spacing λs at the cessation of film cracking.
High Pressure Vibrational Study of
Using Diamond Anvil Cell
An, Hang Seon ; Jeon, Seong Jun ;
Journal of the Korean Ceramic Society, volume 3, issue 2, 1997, Pages 82~82
Investigations of DLC Films for Protection of Organic Photoconductors in Electrophotography
고명완 ; 김성영 ; 신승용 ; 이상현 ; Akihiro Tanaka ; Kazunori Umeda ; Kazuyuki Mizuhara ;
Journal of the Korean Ceramic Society, volume 3, issue 2, 1997, Pages 88~88
The diamondlike (DLC) films were deposited by RF plasma CVD system which had cathode consisting of mesh sheet, for the purpose of a protection from wear of OPC surface of the electrophotographic photosensitive body. Material charateristics and tribological properties of the films were also investigated and finally copying performance was evaluated with DLC deposited OPC samples. The surface resistance of the DLC film unaffected by the surface potential of the OPC was about 1011Ω and its hardness was about 1200 kg/㎟. In this case the film showed typical material strcture of dimondlike hydrocarbon. The friction coefficient of the film was lowered to 0.2∼0.3 at the optimum condition in this investigation and their wear resistant was inproved by DLC-deposition on the OPC surface. DLC-deposited OPC samples with a good copying performance without image flow and draft could be obtained at some depositing conditions.
Development of Diamond-like Carbon Film as Passivation Layers for Power Transistors
장훈 ; 이해왕 ; 정석구 ; 신종한 ; 임대순 ; 박정호 ;
Journal of the Korean Ceramic Society, volume 3, issue 2, 1997, Pages 92~92
Because of the novel characteristics such as chemical stability, hardness, electrical resistivity and thermal conductivity, diamond-like carbon (DLC) film is a suitable material for the passivation layers. For this purpose, using the PECVD, DLC films were synthesized at room temperature. The adhesion and the hardness of the DLC films deposited on Si an SiO₂substrate were measured. The resistivity of 5.3×
Ω·㎝ was measured by automatic spreading resistance probe analysis method. The thermal conductivities of different DLC films were measured and compared with that of phospho silicate glass (PSG) film which is commonly used as passivation layers. The thermal conductivity of DLC film was improved by increasing hydrogen flow rate up to 90 sccm and was better than that of PSG film. The patterning techniques of the DLC film developed using the RIE and the lift-off method to form 5㎛ line. Finally, the thermal characteristics of the power transistor with the DLC film as passiviation layer was analyzed.
The Effect of Hydrogen on the Tribological Properties of Hydrogenated Amorphous Carbon Films
신종한 ; 임대순 ;
Journal of the Korean Ceramic Society, volume 3, issue 2, 1997, Pages 96~96
Hydrogenated amorphous carbon films were deposited on silicon substrates by using an RF PECVD. The hydrogen/methane ratio was varied from 50% to 88% to study the effect of hytdrogen in the film on the tribological properties. The friction and wear behaviors of the deposited films were investigated by ball-on-disk type wear tester. FT-IR spectra were used to characterize the structure of the films. Tribological properties of carbon films were correlated with their structure such as ratio of "polymer-like" stretching type and that of sp² bonding. The result showed that the annealing caused a decrease in the amount of wear of contacted Si₃N₄balls and a increase in the coefficient of friction. Possible explanation for annealing effect was discussed by the hydrogen desorption.
Structure and Mechanical Properties of Si Incorporated Diamond-like Carbon Films Prepared by PACVD
김명근 ; 최준엽 ; 이광렬 ; 은광용 ;
Journal of the Korean Ceramic Society, volume 3, issue 2, 1997, Pages 101~101
Although tribological behavior of Si incorporated DLC films have been intensely investigated, their mechanical properties were not consistent among previous publications. The present work reported the structural change by adding Si, and their effects on the mechanical properties. Si incoporated DLC films were deposited using mixtures of benzene and diluted silane with hydrogen of various volume fractions. We could obtain the films of Xs₁ (defined by the Si fraction without considering hydrogen) ranging from 0.01 to 0.21, and found that the mechanical properties of the films changed significantly in the range less than Xs₁=0.06. In this range, the hardness and stress increased with Xs₁. For higher content of Si, the hardness and stress showed saturated behavior with Xs₁. This behavior was discussed in terms of the changes in atomic bond structures.
Thin Film Adhesion and Cutting Performance in Diamond-Coated Carbide Tools
김종희 ; 정대영 ; 오희갑 ;
Journal of the Korean Ceramic Society, volume 3, issue 2, 1997, Pages 105~105
The effects of surface conditions of the C-2 cemented carbide substrate on the adhesion of diamond film were investigated. The substrates were pretreated for different times with Murakami's reagent and then the acid solution of an H₂SO₄-H₂O₂. The adhesion strength was estimated by a peeling area around the Rockwell-A indentation. The cutting performance of the diamond-coated tools was evaluated by measuring flank wears in dry turning of Al-17% Si alloy. The morphology of deposited diamond crystallites was dominated by (111) and (220) surfaces with a cubooctahedral shape. The diamond film quality was hardly affected by the surface conditions of the substrate. The variation of tool life with longer substrate etching times resulted from a compromies between the increase of film adhesion at the interface and the decrease of toughness at the substrate surface. The coated tools were mainly deteriorated by chipping and flaking of the diamond film form a lock of adhesion strength, differently from the wear phenomena of PCD tools.
Fabrication and Characteristics of Li-doped ZnO Thin Films for SAW Filter Applications
하재수 ; 김광호 ;
Journal of the Korean Ceramic Society, volume 3, issue 2, 1997, Pages 110~110
Li-doped ZnO films were prepared on Corning 1737 glass substrate by an rf magnetron sputtering technique using ZnO targets with various Li₂CO₃ contents ranging from 0 to 10 mol%. The effects of Li doping on the crystallinity and electrical properties of ZnO films were studied for their SAW filter applications. The film resistivity largely increased without suppressing the c-axis orientation and crystallinity with a small addition of Li. Heat treatment of the film at 400℃ induced that the film resistivity, c-axis orientation and crystallinity slightly increased. However, heat treatment of the film at 500℃ resulted in much lower resistivity than that of as-deposited film due to the increase of electron concentration caused by the evaporationof Li atoms from the ZnO film. Large addition of Li into the ZnO film rather diminished the film resistivity and suppressed the c-axis growth. It was concluded that a small doping of Li into the ZnO film and heat treatment at 400℃ caused the film resistivity to be high enough for SAW filter applications without suppression of the c-axis orientation and crystallinity.
Characterization of Chemically Stabilized β-cristobalite Synthesized by Solution-Polymerization Route
Journal of the Korean Ceramic Society, volume 3, issue 2, 1997, Pages 116~116
A chemically stabilized β-cristobalite, which is stabilized by stuffing cations of
, was prepared by a solution-polymerization route employing Pechini resin or PVA solution as a polymeric carrier. The polymeric carrier affected the crystallization temperature, morphology of calicined powder, and particle size distribution. In case of the polyvinyl alcohol (PVA) solution process, a fine β-cristobalite powder with a narrow particle size distribution (average particle size : 0.3㎛) and a BET specific surface area of 72 ㎡/g was prepared by an attrition-milling for 1 h after calcination at 1100℃ for 1h. Wider particle size distribution and higher specific surface area were observed for the β-cristobalite was induced at approximately 180℃. Like other materials showing transformation toughening, a critical size effect controlled the β-to-α transformation. Densifed cristobalite sample had some cracks in its internal texture after annealing. The cracks, occurred spontaneoulsy on cooling, were observed in the sample with an average grain sizes of 4.0 ㎛ or above. In case of the sintered cristobalite having a composition of CaO·2Al₂O₃·40SiO₂, small amount of amorphous phase and slow grain growth during annealing were observed. Shear stress-induced transformation was also observed in ground specimen. Cristobalite having a composition of CaO·2Al₂O₃·80SiO₂ showed a more sensitive response to shear stress than the CaO·2Al₂O₃·40SiO₂ type cristobalite. Shear-induced transformation resulted in an increase of volume about 13% in α-cristobalite phase on annealing for above 10 h in the case of the former composition.
Dissolution and Reprecipitation Behavior of TiC-TiN-Ni Cermets During Liquid-Phase Sintering
윤철수 ; 강신후 ; 김도연 ;
Journal of the Korean Ceramic Society, volume 3, issue 2, 1997, Pages 124~124
An attempt was made to understand the dissolution and reprecipitation behavior of the constituent phases such as TiC, TiN, and Ti(CN) in TiC-TiN-Ni system. During the liquid-phase sintering the TiC phase was found to dissolve preferentially in Ni binder. The solid-solution phase, Ti(CN), formed around the TiN phase, resulting in a core/rim structure. This result was reproduced when large TiC particles were used with fine TiN particles. The path for the microstructural change in TiC-TiN-Ni system was largely controlled by the difference in the interfacial energy of each phase with the liquid binder phase. The results were discussed with thermodynamic principles.
Synthesis and Properties of Self-hardening Calcium Phosphate Cemetns for Biological Application
송태웅 ; 김한엽 ;
Journal of the Korean Ceramic Society, volume 3, issue 2, 1997, Pages 129~129
Fine powder of α-tricalcium phosphate, tetracalcium phosphate and dicalcium phosphate were mixed together to prepare self-setting cements which form hydroxyapatite, one of the well-known biocompatible materials, as the end of products of hydration. Hardening behaviour of the cements was examined at the temperature range of 37∼70℃ and 150∼250℃ under the normal and hydrothermal condition respectively. The conversion of cements into hydroxyapatite was significantly improved ast elevated temperature and the paste was strengtheed by interlocking of hydroxyapatite crystals, indicating that the strength is determined by microtexture rather the amount of conversion of cements into hydroxyapatite.
Luminescence Properties of
-) Doped Ga₂O₃ and ZnGa₂O₄Phosphors
Ryu, Ho Jin ; Park, Hui Dong ;
Journal of the Korean Ceramic Society, volume 3, issue 2, 1997, Pages 134~134
Compositional Dependence of Photoluminescence of ZnGa₂O₄
Lee, Yong Je ; Nam, San ; Kim, Myeong Ho ; Seo, Gyeong Su ; Jo, Gyeong Ik ; Yu, Hyeong Jun ; Byeon, Jae Dong ;
Journal of the Korean Ceramic Society, volume 3, issue 2, 1997, Pages 139~139