Although the near-net-shape forming ability of gelcasting has been well demonstrated, current attention mainly was focused on manufacturing compact ceramics. In this work we demonstrated that the combination of the gelcasting technique and the ceramic sintering process could prepare the near-net-shape through-pore hydroxyapatite (HAP) ceramics, in which the pore diameter at the range of < 2 μm could be adjusted by changing the content of HAP in green bodies and with the aid of alcohol immersion. Experiments demonstrated that the gels in green bodies and alcohol immersion played important roles in improving the strength of green bodies and decreasing the shrinkage and deformation of green bodies, and thus improving the through-pore and near-net-shape forming of HAP ceramics. Such method reported here possibly extends the gelcasting technique to manufacture other through-pore ceramics for precise filtration, protein separation, or high performance liquid chromatography.

尽管已经充分证明了凝胶浇铸的接近最终形状的形成能力，但是当前的注意力主要集中在制造紧凑型陶瓷上。在这项工作中，我们证明了凝胶浇铸技术和陶瓷烧结工艺的结合可以制备出近净形通孔羟基磷灰石（HAP）陶瓷，其中可以通过以下方法调节<2μm范围内的孔径借助酒精浸泡来改变生坯中HAP的含量。实验表明，生坯中的凝胶和浸入醇对提高生坯的强度，减少生坯的收缩和变形，从而改善HAP陶瓷的通孔和近净形形成起着重要作用。