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SHS 화학로에 의한 $B_4C$ 합성 및 기계적 특성에 관한 연구
이형복,조덕호,박성,이재원,Lee, Hyung-Bock,Cho, Duk-Ho,Park, Sung,Le, Jea-Won 한국세라믹학회 1993 한국세라믹학회지 Vol.30 No.8
Boron cabride was prepared from the mixture of metal boron and graphite powders in Argon atmosphere by Self-propagating High-temperature Synthesis Chemical furnace. The most excellent mechanical properties were in the case that Fe was added as a sintering agent before the synthesis of the B4C in the Chemical furnace. Sintered B4C-5wt% Fe specimen showed the relative density of 95%, of theoretical value, and 3-point-flexural strength of 380MPa.
SHS법에 의한 ZrC 합성 및 온도 Profile 분석
이형복,조건,이재원,Lee, Hyung-Bock,Cho, Kurn,Lee, Jea-Won 한국세라믹학회 1995 한국세라믹학회지 Vol.32 No.6
Zirconium carbide was prepared from the mixture of metal zirconium and carbon powders in argon atmosphere by Self-propagating High-temperature Synthesis (SHS) in order to obtain the best carbon source and dilution contents. The most exellent result was obtained in the case that active carbon was added as a starting material, 20~30 wt% dilution content. From thermal profile analysis an apparent activation energy of 118 KJ/mol was calculated. The maximum heating rate achieved during 15 wt% ZrC reaction by product dilution method was approximately 1.54$\times$105 K/s. Coupling this value with the measured wave velocity of 1.026cm/s yielded a maximum thermal gradient fo $1.5\times$105 K/cm. Using the definition of t* and the measured wave velocity, the effective thermal diffusivity, $\alpha$, was calculated to be 0.62$\times$102 $\textrm{cm}^2$/s.
이형복,정윤중,김영규,이홍림 한국세라믹학회 1989 한국세라믹학회지 Vol.26 No.1
The properties of the powders of ZrO2-MgO system prepared by co-precipitation method using ZrOCl2.8H2O and MgCl2.6H2O as starting materials were investigated after calcination from $600^{\circ}C$ to 120$0^{\circ}C$. The crystallization temperature of amorphous ZrO2 was increased as MgO contents increased. The crystallite size of ZrO2 was increased with increasing calcination temperature. The crystallite size of tetragonal ZrO2 calcined at 100$0^{\circ}C$ for 1hr wa about 45nm, and MgO contributed effectively to promoting stability of tetragonal Zirconia.
SHS법에 의한 $TiB_2-TiC$ 복합체의 소결특성에 관한 연구
이형복,조덕호,장준원 한국세라믹학회 1992 한국세라믹학회지 Vol.29 No.7
TiB2 and TiC were prepared from the mixture of metal titanium, boron and graphite powders in Argon atmosphere by Self-propagating High-temperature Synthesis method. The sintered properties of TiB2-TiC composite as a function of TiC content and sintering temperature were investigated in TiB2 matrix. The sintered properties were the most excellent at 10 wt% TiC content in TiB2-TiC composite. The relative density, M.O.R strength, hardness and fracture toughness of TiB2-10 wt% TiC composite sintered at 190$0^{\circ}C$ for 90 min by hot-pressing under the pressure of 30 MPa were 98.6%, 634 MPa, 2128.1 kg/$\textrm{mm}^2$ and 4.09 MN/m3/2, respectively.
SHS 화학로에 의한 (Ti.W)C 복탄화물의 합성 및 기계적 특성에 관한 연구
이형복,오유근,이풍헌,장동환 한국세라믹학회 1996 한국세라믹학회지 Vol.33 No.4
(Ti.W)C complex carbide was synthesized by self-propagating high temperature synthesis (SHS) chemical furnace. Attempt to find the optimal condition for synthesis of (Ti.W)C the effects of molar ratio of Ti:W:C on the synthesized powders and mechanical properties were investigated, Optimum molar ratio of these synthe-sized powder was Ti:W:C=0.7:0.2:1.0 The bulk density M,O.R Hardness Fracture toughness of (Ti.W)C complex carbide sintered at 200$0^{\circ}C$ for 60 min by hot-pressing under the pressure of 20 MPa were 7.6g/cm3, 475 MPa, 17,.7 GPa respectively.
SHS 화학로에 의한 (B.Si)C 복합체의 합성 및 기계적 특성에 관한 연구
이형복,조덕호,이재원 한국세라믹학회 1995 한국세라믹학회지 Vol.32 No.4
The (B.Si)C composite was prepared form the mixture of metal boron, silicon, and carbon powders in Ar atmosphere by Self-propagating High-temperature Synthesis Chemical Furnace. The characterization of synthesized power and sintered body were investigated. The microstructure of sintered body suggested that SiC boundary was made between B4C grains. The most excellent mechanical properties, the relative density of 95% oftheoretical value, 3 point flexural strength of 360MPa, and fracture toughness of 3.6MN/m3/2 could be obtained in 80wt% B4C-20 wt% SiC composite were obtained.
이형복,정윤중,여철현,김관일 한국세라믹학회 1990 한국세라믹학회지 Vol.27 No.1
Titanium Cabride powders were prepared by the self-propagating high temperature synthesismethod in air from the mixture of metal titanium powder and carbon powder. The result are as follows : 1. The conversion effciency of higher than 95% can be obtained and the lattice constant value of the product was 4.322$\AA$. 2. The combustion mode, velocity and temperature of combustion wave was photographed using high-speed camera, and showed steady-state, velocity of 15.414mm/sec at 250$0^{\circ}C$. 3. The relative density and MOR strength of TiC sintered at 180$0^{\circ}C$ for 90 minutes by hot-pressing under the pressure of 200kg/$\textrm{cm}^2$ were 95% and 395MPa, respectively.