http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
김인술,장주민,오기동,박홍채 한국세라믹학회 1992 한국세라믹학회지 Vol.29 No.9
Reaction bonded si-SiC composites were prepared by silicon infiltration technique at temperature of 1$600^{\circ}C$ for 30 minutes in vaccum atmosphere. The microstructure and mechanical properties of Si-SiC composites were investigated and characterized. UF-15 and SE-10 as SiC powders, phenolic resin and carbon black as carbon source, and metallic silicon powder as molten Si source were used as starting materials. New SiC crystallines nucleatd and grown by reaction of Si and C were detected by TEM and SEM-EDS. The bonding between new and original SiC was found to be strong. But the wetting of SiC by unreacted metallic Si and the rapid grain growth of new SiC decreased density and fracture toughness. Fracture toughness and modulus of rupture of Si-SiC composite were about 3.2 MPa.m1/2 and 480 MPa, respectively.
분위기 가압소결에 의한 SiC$_{(P)}$-TiC$_{(P)}$ 복합체 제조
김인술,김병수,장윤식,박홍채,오기동 한국세라믹학회 1992 한국세라믹학회지 Vol.29 No.10
SiC(p)-TiC(p) composites were prepared by gas pressure sintering technique. B4C powder and phenolic resin were added as sintering aids by 0.3 wt%-B and 3 wt%-C, TiC powder were dispersed in SiC by 0, 10, 20, 30 and 50 vol%. Flextural strength, fracture toughness and theoretical density of 70 vol% SiC-30 vol% TiC composite sintered at 220$0^{\circ}C$ by gas pressing were 540 MPa, 5.5 MPa.m1/2 and 98.8% respectively.
김효준,김인술,이상완 한국세라믹학회 1990 한국세라믹학회지 Vol.27 No.7
Effects of metallic Al powder addition on basic and thermal properties of castable refractories were investigated. Generally, low grade prooperties were obtained by metallic Al powder addition with the increase of temperature, comparing with those of non-addition of Al powder. Especially, Al addtion showed severe shrinkage, corrosiion and low strength above 1000$^{\circ}C$. As a result of Al addition, lower strength of and higher corrosion resistance were shown for 2% addition, but it was reversed for above 4% addition. It was found that Al addition was excellent in the explosive spalling test regardless of Al quantity.
Hot Pressing에 의한 $Si_3N_4-SiC$ 나노복합체의 제조
김성현,김인술,박홍채,오기동 한국세라믹학회 1994 한국세라믹학회지 Vol.31 No.9
SiC ultrafine particles of 1, 10, 20 and 30 vol% were dispersed in $\alpha$-Si3N4 matrix and hot-pressed under the condition of 30 MPa at 1800 and 190$0^{\circ}C$ respectively. Physical, mechanical properties and microstructures of sintered Si3N4-SiC nanocomposites were investigated. Flexural strength and density of Si3N4-10 vol% SiC nanocomposites hot-pressed at 190$0^{\circ}C$ represented the 1002 MPa and 97.9%T.D respectively, and it was confirmed as a remarkable improvement of 67% compared to Si3N4 monolith. Fracture toughness was shown as 7.2 MPa.m1/2 when the same composition was hot pressed at 180$0^{\circ}C$. This effect was supposed to be due to the improvement of microstructure by the adequate suppression of the excessive growth of Si3N4 grain with SiC nano-particles.
마그네시아 지르코니아 복합소결체의 소결과 미세구조에 미치는 $TiO_2$의 영향
이윤복,김인술,장윤식,박홍채,오기동,Lee, Yun-Bok,Kim, In-Sul,Jang, Yun-Sik,Park, Hong-Chae,O, Gi-Dong 한국재료학회 1994 한국재료학회지 Vol.4 No.7
마그네시아-지르코니아 복합체의 소결과 미세구조에 미치는 $TiO_{2}$의 영향에 대하여 검토하였다. 3mol%$Y_{2}$O_{3}$를 함유한 $ZrO_{2}$는 $TiO_{2}$첨가시 $1400^{\circ}C$에서 기지상인 MgO와 첨가제인 $TiO_{2}$의고용에 의해서 $c-ZrO_{2}$상으로 존재하였다. $TiO_{2}$첨가시 조성에 관계엾이 승온수축거동은 유사하였으며 $1650^{\circ}C$에서 최종수축율은 8.58-11.0%였다. 1.67wt%$TiO_{2}$첨가시 소결이 촉진되어 $1600^{\circ}C$ 2시간에서의 소결밀도는 3.7g/$\textrm{cm}^3$(이론밀도의 98%)였다. $ZrO_{2}$내에 고용된 MgO와 $TiO_{2}$의 양은 각각 5.67wt%, 2.62wt%로 냉각과정중 입계주위에서 일부 석출되어 Ti화합물을 형성하였다. 이의 존재로 말미암아 생성된 미세균열은 꺽임강도를 감소시켰다. Influence of $TiO_{2}$ addition on sintering behavior and microstructure of MgO-$ZrO_{2}$ composites was studied. $ZrO_{2}$ containing 3mol%Y203 was existed as a c-$ZrO_{2}$ phase due to the formation of solubility of MgO, $TiO_{2}$ and $ZrO_{2}$ when sintered $1400^{\circ}C$ for 2h. All the compositions employed exhibited a similar shrinkage behavior with an end-point shrinkage between 8.58 and 11.00%. The additlon of $TiO_{2}$ promoted densification and the bulk density of specimen containing 1.67wt% $TiO_{2}$ was 3.75g/$\textrm{cm}^3$(98% TD) when $1600^{\circ}C$ for 2h. The amount of solubilities of MgO and TiOz in $ZrO_{2}$ were 5.ti7wt% and 2.62wt%,respectively. They were partially segregated near $ZrO_{2}$ grain boundary in the form of Ti-compounds during cooling. This segregation resulted in the formation microcracks which decreased the bending strength.
$\alpha$-SiC 소결체의 특성에 미치는 소성조건의 영향
정두화,김인술,김효준 한국세라믹학회 1991 한국세라믹학회지 Vol.28 No.10
$\alpha$-SiC(B; 0.4 wt, C; 3 wt%) was sintered in Ar atmosphere from 205$0^{\circ}C$ to 220$0^{\circ}C$ by means of pressureless sintering and gas pressure sintering in order to find optimum sintering condition of $\alpha$-SiC. Mechanical properties and microstructures of sintered bodies were investigated according to sintering method. The effect of sintering condition on sinterability of $\alpha$-SiC was also examined by using the dilatometer. 97.5% and 98.8% of theoretical density were obtained from pressureless sintering and gas pressure sintering of $\alpha$-SiC powder, respectively. And modulus of rupture was measured as 270~350 MPa and 420 MPa respectively.
고강도 $Si_3N_4/SiC$ 구조세라믹스에 관한 연구
김병수,김인술,장윤식,박홍채,오기동 한국세라믹학회 1993 한국세라믹학회지 Vol.30 No.12
Si3N4(p)-SiC(p) composites were prepared by gas pressure sintering at 190$0^{\circ}C$ for 1 hour. $\alpha$-SiC with average particle size of 0.48${\mu}{\textrm}{m}$ were dispersed from zero to 50vol% in $\alpha$-Si3N4 with average particle size of 0.5${\mu}{\textrm}{m}$. Y2O3-Al2O3 system was used as sintering aids. When 10vol% of SiC was added to Si3N4, optimum mechanical properties were observed; relative density of 98.8%, flextural strength of 930MPa, fracture toughness of 5.9MPa.m1/2 and hardness value of 1429kg/$\textrm{mm}^2$. Grain growth of $\beta$-Si3N4 was inhibited as the amount of added SiC was increased. SiC particles were found inside the $\beta$-Si3N4 intragrains in case of 10, 20 and 30vol%SiC added composites.