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Gain, Asit Kumar,Lee, Byong-Taek Elsevier 2006 Materials science & engineering. properties, micro Vol.419 No.1
<P><B>Abstract</B></P><P>Continuously porous t-ZrO<SUB>2</SUB> bodies having different pore sizes were fabricated using the multi-pass extrusion process. The pore size depended on the number of extrusion passes, the extrusion ratio, and rod diameter and tube thickness. The pore size dramatically decreased as the number of extrusion passes and tube thickness increased. The pore sizes of the 2nd passed samples, which were made by a feed roll using different rod diameters and tube thickness, were about 260, 180, 150 and 90μm in diameter while the 3rd passed samples which were made with different extrusion ratios (40:1 and 61:1) were about 80 and 35μm in diameter, respectively. In the 2nd passed t-ZrO<SUB>2</SUB> bodies sintered at 1550°C, the relative density and bending strength decreased as the pore size increased. In the 3rd passed sample having a pore size of 35μm, the bending strength increased as the sintering temperature increased up to 1550°C. The maximum bending strength of the 3rd passed t-ZrO<SUB>2</SUB> body was about 297MPa.</P>
( Asit Kumar Gain ),( Ho Yeon Song ),( Byong Taek Lee ) 대한금속재료학회 ( 구 대한금속학회 ) 2006 대한금속·재료학회지 Vol.44 No.6
The continuously porous t-ZrO2 bodies with different pore sizes (90 ㎛, 150 ㎛, 180 ㎛, 260 ㎛) were fabricated using a multi-pass extrusion process. As the sintering temperature increased from 1300 to 1500℃, the bending strength value of porous t-ZrO2 bodies (260 ㎛ pore size) increased and its maximum value was about 157 MPa. On the other hand, as increasing the pore size, the relative density and bending strength values were remarkably decreased. In the porous body having 90 ㎛ pore, the bending strength was about 450 MPa. Human osteoblast like MG-63 cells and osteoclast like Raw 264.7 cells were well grown and through the continuously pores as well as on the surface of the continuously porous t-ZrO2 bodies. The osteoblast cell was grown with spindle shape, condensed circular growth and three-dimensional network type. In contrast, the osteoclast cells were appeared with pebble stone type.