To produce highly porous MgO-doped alumina (Al2O3) ceramics, expanded polystyrene (EPS) beads were packed as a pore former and well-dispersed alumina slurry was used to infiltrate the pore space in the EPS bead compacts. The alumina particle-EPS bead green compacts were then heated to 1550 degrees Celsius in air to burn out the pore former and subsequently densify the MgO-doped alumina struts. The porous Al2O3 ceramics were featured with uniformly distributed open pore structures with porosities ranging from 72 % to 78 % and pore interconnectivity of about 96 %. The macropore size and the pore window size could be controlled by adjusting the size of the EPS beads and the contacting area between the EPS beads. The compressive strengths of the porous Al2O3 ceramics were in the range of 5.5 MPa - 7.5 MPa, similar to those of cancellous bones (2-12 MPa). The porous alumina ceramics were further made bioactive after the coating of sol-gel derived 58S bioglass powder, followed by sintering at 1200 degrees Celsius.
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机译：为了生产高度多孔的掺MgO的氧化铝（Al2O3）陶瓷，将膨胀的聚苯乙烯（EPS）珠粒包装为造孔剂，并使用分散良好的氧化铝浆料渗透EPS珠粒压坯中的孔空间。然后将氧化铝颗粒-EPS珠坯压坯在空气中加热到1550摄氏度，以烧蚀成孔剂，随后使掺MgO的氧化铝支杆致密化。多孔Al 2 O 3陶瓷的特征在于具有均匀分布的开孔结构，其孔隙率在72％至78％的范围内并且孔的互连性为约96％。大孔尺寸和孔窗口尺寸可以通过调节EPS珠的尺寸和EPS珠之间的接触面积来控制。多孔Al2O3陶瓷的抗压强度在5.5 MPa-7.5 MPa的范围内，与松质骨的抗压强度（2-12 MPa）相似。在涂覆溶胶-凝胶衍生的58S生物玻璃粉末后，进一步使多孔氧化铝陶瓷具有生物活性，然后在1200摄氏度下烧结。
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