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다공성 세라믹스와 다공질층을 포함하는 적층세라믹스의 제조에 관한 연구;II. 불균일 적층소결체
이해원,윤복규,송휴섭 한국세라믹학회 1994 한국세라믹학회지 Vol.31 No.11
Tape casting and lamination were used to produce heterogeneous laminates with alternating layers of different porosity and homogeneous laminates with component layers of the same porosity. The pore structure was investigated for heterogeneous laminates, and bend strength was measured for comparison with that of homogeneous laminates. For a reference, strength measurement was made for the porous body fabricated by sintering samples dry-pressed at low pressure with spray-dried granules. Strength increase, in the range 50~120 MPa, was achieved in the presence of the surface dense layer, while extensive delamination, presumably responsible for enhanced fracture toughness, took place through the internal porous layer.
다공성 세라믹스와 다공질층을 포함하는 적층체의 제조에 관한 연구;I. 기공구조
이해원,윤복규,송휴섭 한국세라믹학회 1994 한국세라믹학회지 Vol.31 No.9
Tape casting technique was successfully applied to produce porous ceramics and multi-layered ceramics containing porous layers, where spherical hollow polymer particles were introduced as pore precursors. In the presence of extreme differences in density and size between Al2O3 and pore precursor particles, hindered settling was effective in preventing segregation of component particles and packing behavior of mixed powders was improved through bimodal packing. There were two transitions in packing behavior of mixed powders. The first transition took place at 40~50 vol% pore precursor addition, where majority of pores changed from close to open pore state. The other transition occured at 60~70 vol% pore precursor addition, where pore precursor particles formed a continuous network structure.