ABSTRACT

Flash sintering (FS) is becoming a popular densification route for high-temperature oxide ceramics because of its rapid sintering performance. In the current study, bar-shaped hydroxyapatite (HA) specimens were hung between two Pt wire electrodes and consolidated by FS through a direct electric field at a constant furnace temperature (1000°C or 1100°C) in air. The electric field facilitated the sintering of HA at relatively lower furnace temperatures than that obtained using the conventional sintering method. The voltage required for the onset of the flash decreased with increasing furnace temperature. The effects of the DC electric field strength at different sintering furnace temperatures were examined in terms of the phase evolution and stability of HA. HA phase dissociation was not observed regardless of the electric field strength or furnace temperature because of the very short FS time. Higher grain growth with fast densification in the flashed-sintered HA samples occurred with increasing electric field strength at each furnace temperature.

摘要

快速烧结 (FS) 因其快速烧结性能而成为高温氧化物陶瓷的流行致密化途径。在目前的研究中，棒状羟基磷灰石 (HA) 样品悬挂在两个 Pt 线电极之间，并通过 FS 在空气中恒定炉温（1000°C 或 1100°C）下通过直接电场进行固结。与使用传统烧结方法获得的温度相比，电场有助于在相对较低的炉温下烧结 HA。闪光开始所需的电压随着炉温的升高而降低。研究了不同烧结炉温度下直流电场强度对 HA 相演变和稳定性的影响。由于 FS 时间非常短，因此无论电场强度或炉温如何，均未观察到 HA 相解离。在每个炉温下，随着电场强度的增加，闪蒸烧结的 HA 样品中出现更高的晶粒生长和快速致密化。