关键词: 玻璃陶瓷, 成孔剂, 刚性, 塑性, 多孔

Abstract: This study presents the manufacture of highly porous biological glass-ceramic with interconnected pores by adding porosifier, and its main
crystallized products are fluroapatite and wollastonite. The effects of preparation conditions involving porosifier deformation during pressing
(die-pressing technique), particle size and content, and forming pressure on the resultant porosity, pore size as well as structure and mechanical
properties were investigated. The experimental results demonstrate that the resultant porous glass-ceramic with a successful control of pore size
and 50%～82% volume fraction porosity can be obtained. Macropores with 250～850μm diameter forming through the pyrolysis of porosifier
interconnect through the holes with 50～300μm diameter in pore wall. Very little pore volume results from micropores with 2～4μm diameter
because of the incomplete sintering of glass particles. Due to plastic deformation under pressure, the green body that is added plastic porosifier
stearic acid is with high-strength and can be machined into complex shape, and the sintered products with flat-sphere shape macropores are with
high-strength also. On the contrast, because of elastic deformation of rigid porosifier polystyrene under pressure, green body is with low-strength
and can’t be machined, and the sintered products with round-sphere shape macropores are with low-strength also. The forming pressure has a strong impact on the properties of samples with plastic porosifier stearic acid,
but do not influence the properties of samples with rigid porosifier polystyrene significantly. The total porosity correlates with the weight content of
porosifier linearly, so the porosity and pore diameter can be controlled through controlling the porosifier size and its content. The compressive
strength increases with increased porosi

Key words: glass-ceramic, porosifier, porous, preparation