Papers by Keyword: Porous Body

Abstract: A dense alumina body with anisotropic grains was fabricated from anisotropic particles (platelets) after heating at 1650°C for 15 min under applying pressure of 60 MPa using a PECS technique. When the alumina was cut on the vertical plane to the load direction while sintering, the breakdown voltage was 15 KV/mm and thermal conductivity was 36 W/mK. On the other hand, a porous alumina body was also synthesized from alumina platelets. The uniaxial pressure in fabricating the green compact body had an influence on the relative density of the alumina body after heating. The relative density and compressive strength of the compact that was uniaxially pressed at 1 MPa were 75 %, respectively. In addition, the relative density and compressive strength of compact that was uniaxially pressed at 3 MPa were 64 %, respectively. The thermal conductivity of the porous alumina with 64% in porosity was 0.8 W/Km.

Abstract: Porous a-tricalcium phosphate (a-TCP) ceramics are attractive as a novel bioresorbable material for bone repair, since they can be easily fabricated through conventional sintering of b-TCP at high temperature. However, the solubility of a-TCP is too high to keep its body until the bone defect is repaired completely. Coating of the a-TCP porous body with organic polymer is a way to reduce the degradation rate. In the present study, biodegradation of a-TCP porous body coated with silk sericin was evaluated in vivo. Bone repair at the defect made in rabbit tibia was nearly completed after 4 weeks. Higher density of cortical bone was estimated for a-TCP coated with sericin than for mere a-TCP. The a-TCP porous body coated with sericin is expected as a material that show less degradation than mere a-TCP, and may result in suitable bone repair.