Abstract The exothermic reaction between a pair of combustible pore formers (urea-ammonium nitrate) is the driving force in realizing low-temperature consolidation of hydroxyapatite (HA) particles. The particles are allowed to sinter in the proximity to the combustible pore formers. The exothermic (ΔH°rea = -898 kJ/mol) redox reaction between combustible pore formers is successfully utilized in deriving high compressive strength (~24 MPa) of HA at 300 °C. The evolution of gaseous products of combustion results in an interconnected porous network of HA. The estimated compressive strength of sintered HA at 300 °C is comparable with high temperature (1100 °C) conventionally sintered HA, at a fixed open porosity (~40%); which depicts nearly ~82% achievement with a reduction of sintering temperature by ~72%. Also, the pellets sintered at 600 °C have shown ~90% achievement in compressive strength of sintered HA. Further, the saturated pore area of 15% requires a sintering time of 9.58 h at a sintering temperature of 600 °C. Thus, combustion-assisted sintering is an alternative technique proves its potentiality in achieving remarkable compressive strength and paves the way for low-cost porous ceramics.

中文翻译：

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燃烧辅助原位固结具有最小热预算的高强度多孔陶瓷结构

摘要 一对可燃成孔剂（尿素-硝酸铵）之间的放热反应是实现羟基磷灰石（HA）颗粒低温固结的驱动力。允许颗粒在可燃成孔剂附近烧结。可燃造孔剂之间的放热 (ΔH°rea = -898 kJ/mol) 氧化还原反应成功地用于在 300°C 下获得高抗压强度 (~24 MPa) 的 HA。燃烧的气态产物的演变导致 HA 的互连多孔网络。烧结 HA 在 300 °C 下的估计抗压强度与高温 (1100 °C) 常规烧结 HA 相当，具有固定的开孔率 (~40%)；这描绘了近 82% 的成就，烧结温度降低了约 72%。还，在 600 °C 下烧结的球团在烧结 HA 的抗压强度方面取得了约 90% 的成就。此外，在 600°C 的烧结温度下，15% 的饱和孔隙面积需要 9.58 小时的烧结时间。因此，燃烧辅助烧结是一种替代技术，证明了其在获得显着抗压强度方面的潜力，并为低成本多孔陶瓷铺平了道路。