微波等离子体烧结多孔HA/β-TCP双相生物陶瓷的研究

Microwave Plasma Sintering of Porous HA/β-TCP Biphasic Bioceramics

针对常规马弗炉烧结钙磷生物陶瓷温度高、烧结时间长,制品晶粒粗、强度和生物学活性难于同时提高的问题,采用微波等离子体新技术烧结了多孔HA/β-TCP双相生物陶瓷。实验结果显示,和常规马弗炉烧结法相比,微波等离子体烧结可在极短的加热时间内,制得线收缩率较大,晶粒尺寸小,抗压强度更大的多孔HA/β-TCP双相生物陶瓷。通过模拟体液的浸泡实验发现,其类骨磷灰石形成量也明显多于常规马弗炉烧结。这预示微波等离子体烧结是一种既能提高钙磷材料的力学强度,同时又可能增加其生物学活性的新烧结方法。

Aimed at solving the problems on sintering of Ca-P bioceramics by using a conventional furnace, such as high sintering temperature, long holding time, large grain size and the difficulty to enhance the bioactive and the mechanical strength simultaneously, porous HA/β-TCP biphasic bioceramics were prepared by using a microwave plasma method. The properties of specimens were compared to those of specimens sintered by a conventional furnace. The comparison shows that plasma sintered specimens exhibit a higher linear shrinkage and densification rate, smaller grain size and higher compressive strength. After incubating in SBF, the amount of bone-like apatite formed on the specimens sintered by microwave plasma is more than that of specimens sintered by a conventional furnace. The results indicate that porous HA/β-TCP biphasic bioceramics sintered by microwave plasma have better mechanical properties and also may have better biological properties.