• Journal of the Korean Ceramic Society
• /
• v.36 no.2
• /
• pp.220-224
• /
• 1999

For the process control of silicon nitride gelcasting, the effect of MeOH on the apparent gel induction time of slip, drying rate, and mechanical property of gelcast body were investigated. The apparent gel induction time showed maximum at 10~20 vol% MeOH and the drying rate of gelcast body increased in the ranged of 25~40%. The gelcast body was still machinable in the 40% of MeOH, though the mechanical property and relative density slightly decreased with increasing the amount of MeOH.

• Journal of the Korean Ceramic Society
• /
• v.36 no.7
• /
• pp.773-781
• /
• 1999

A new technique to fabricate complex-shaped mullite has been developed through gelcasting without organic binder. The suspension of a commercial mullite powder and boehmite-SiO2 sol as binder was elecrtrosterically stabilized. Ammonium polymetharylyate was employed as a dispersant for the electrosteric stabilization. Complex-shaped bodies were made through casting and gelation at room temperature. The green bodies were dried at a temperature of 30$^{\circ}C$ and relative humidity of 98% without crack development. The dried bodies were then pressureless-sintered at 1650$^{\circ}C$ for 2 h to get a relative density of 98% The Vickers hardness and 4-point flexural strength of sintered parts were 11.0 GPa and 150MPa respectively which are similar to those of commercially available sintered mullite.

• Journal of the Korean Ceramic Society
• /
• v.36 no.3
• /
• pp.266-273
• /
• 1999

본 연구에서는 겔캐스팅법의 제조공정 확립을 위하여 분산제의 분자구조가 질화규소 슬립의 점성특성 및 성형체의 상대밀도와 기계적 특성에 미치는 영향을 조사하였다. 슬립과 겔캐스팅 성형체의 제조방법은 기보고된 방법과 동일하게 하였다. 그 결과, 겔캐스팅 슬립의 점성은 분산제의 분자구조와 모노머와 분산제의 구성비율에 크게 의존하였다. PMAA 분산제를 사용한 슬립의 점성은 PAA 및 PAAm 분산제 보다 높은 점도를 나타내었다. 성형체의 상대밀도는 슬립의 농도에 크게 의존하였으며, 분산제양과 모노머의 양변화에는 그다지 변화가 없었다. 그리고, 겔캐스팅 성형체의 기계적 특성은 크게 모노머의 농도에 의존하였으며, 분산제양과 슬립의 농도에는 큰 변화가 없었다.

• Proceedings of the Korean Society of Rheology Conference
• /
• 2000.05a
• /
• pp.100-103
• /
• 2000

• Proceedings of the Korean Ceranic Society Conference
• /
• 2000.10a
• /
• pp.34.1-34
• /
• 2000

• Proceedings of the Korean Ceranic Society Conference
• /
• 2000.10a
• /
• pp.33.1-33
• /
• 2000

• Proceedings of the Korean Ceranic Society Conference
• /
• 2000.10a
• /
• pp.33.2-33
• /
• 2000

• Journal of the Korean Ceramic Society
• /
• v.36 no.2
• /
• pp.178-185
• /
• 1999

For the process control of silicon nitride gelcasting, the composition effect of acryamide system on the viscosity of slip and mechanical property of gelcast green body were investigated. The slip was prepared by ball milling of silicon nitride suspension prepared with acrylamide monomer and polyelectrolyte dispersant after premixing them by attritor. The slip mixed with initiator was vacuum deaired and cast into molds, and then polymerized. The consolidated green body was obtained by drying the gelated slip. The viscosity measument and the diametral compression test was done to evaluate the rheological behaviro of slip and mechanical property of gelcast body, respectively. Experimental results showed that the high solid loading of silicon nitride slip was obtained up to 46 vol% with a low viscosity. The mechanical property of gelcast body mainly increased with increasing the concentration of monomer. The gelcast body was machinable above the ∼3 MPa of tensile strength. The relative density of pressured-sintered body was 98.5% at 1760$^{\circ}C$, 3 h.

• Journal of the Korean Ceramic Society
• /
• v.44 no.10
• /
• pp.574-579
• /
• 2007

Porous $Al_2O_3$ ceramics were prepared by the gelcasting foams method (a slurry foaming process) with acrylamide monomer. The foaming and gelation behavior was investigated with the parameters such as the type and concentration of surfactant, solid loading of slurry, and the concentrations of initiator and catalyst. Density, porosity, microstructure, and strength of the green and sintered samples were characterized. Of the four kinds of surfactants tested, Triton X-114 showed the highest foaming ability for the solid loading of 55-30 vol%. The gelation condition giving the idle time off min was found to set the foamed structure without significant bubble enlargement and liquid lamella thinning. The green samples were fairly strong and machinable and showed maximum strength of 2.4 MPa in diametral compression. The sintered samples showed densities of 10-36% theoretical (i.e. porosity 90-64%) with a highly interconnected network of spherical pores with sizes ranging from 30 to $600{\mu}m$. The pore size and connectivity increased but the cell strut thickness decreased with decreasing the solid loading. Flexural strength of 37.8-1.7 MPa was obtained for the sintered samples.

• Applied Chemistry for Engineering
• /
• v.10 no.5
• /
• pp.748-753
• /
• 1999

In gelcasting process of the Si powder slurry mixed with acrylamide monomers, it was characterized the effects of chemical parameters such as monomers and additives(polymerization initiator, catalyst and dispersant), Si powder and humidity at drying on processing parameters such as viscosity and idle time as well as on shrinkage and mechanical strength of green bodies. Generally, idle time decreased as initiator and catalyst amounts were increased, but rather depended on initiator. Idle times of the slurries greatly decreased to less than 1/2 time of the premix solutions in which gelation was delayed at higher MBAM portion as a crosslinking monomer. And fluidity of the slurries became worse at greater than 0.6 wt % dispersant. The green bodies showed only less than 7% of linear shrinkage without crack and distortion when dried for longer than 300 hrs under 98% humidity. Typically, the dried bodies containing 40, 50 vol % of Si powder displayed 64 and 36 Mpa in average, respectively.