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首页> 外文期刊>Acta biomaterialia >Hydrogen release from titanium hydride in foaming of orthopedic NiTi scaffolds.
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Hydrogen release from titanium hydride in foaming of orthopedic NiTi scaffolds.

机译：矫形NiTi支架发泡时，氢化钛释放氢。

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Titanium hydride powders are utilized to enhance the foaming process in the formation of orthopedic NiTi scaffolds during capsule-free hot isostatic pressing. In order to study the formation mechanism, the thermal behavior of titanium hydride and hydrogen release during the heating process are systematically investigated in air and argon and under vacuum by X-ray diffraction (XRD), thermal analysis, including thermogravimetric analysis and differential scanning calorimetry, energy dispersive X-ray spectroscopy, and transmission electron microscopy. Our experiments reveal that hydrogen is continuously released from titanium hydride as the temperature is gradually increased from 300 to 700 degrees C. Hydrogen is released in two transitions: TiH1.924-->TiH1.5/TiH1.7 between 300 degrees C and 400 degrees C and TiH1.5/TiH1.7-->alpha-Ti between 400 degrees C and 600 degrees C. In the lower temperature range between 300 degrees C and 550 degrees C the rate of hydrogen release is slow, but the decomposition rate increases sharply above 550 degrees C. The XRD patterns obtained in air and under vacuum indicate that the surface oxide layer can deter hydrogen release. The pressure change is monitored in real time and the amount of hydrogen released is affected by the processing temperature and holding time. Holding processes at 425 degrees C, 480 degrees C, 500 degrees C, 550 degrees C, and 600 degrees C are found to significantly improve the porous structure in the NiTi scaffolds due to the stepwise release of hydrogen. NiTi scaffolds foamed by stepwise release of hydrogen are conducive to the attachment and proliferation of osteoblasts and the resulting pore size also favor in-growth of cells.
机译：氢化钛粉末用于在无胶囊热等静压过程中增强矫形NiTi支架形成过程中的发泡过程。为了研究其形成机理，通过X射线衍射（XRD），热分析（包括热重分析和差示扫描量热法），系统地研究了在空气和氩气中以及真空下在加热过程中氢化钛和氢的热行为。 ，能量色散X射线光谱和透射电子显微镜。我们的实验表明，随着温度从300℃逐渐升高到700℃，氢从氢化钛中连续释放。氢在两个转变中释放：TiH1.924-> TiH1.5 / TiH1.7在300摄氏度和400摄氏度之间C和TiH1.5 / TiH1.7->α-Ti介于400摄氏度和600摄氏度之间。在300摄氏度和550摄氏度之间的较低温度范围内，氢的释放速度较慢，但​​分解速率在550摄氏度以上会急剧增加。在空气和真空下获得的XRD图谱表明，表面氧化物层可以阻止氢的释放。实时监测压力变化，释放的氢气量受加工温度和保持时间的影响。发现在425℃，480℃，500℃，550℃和600℃的保持过程由于氢的逐步释放而显着改善了NiTi支架中的多孔结构。通过逐步释放氢而发泡的NiTi支架有利于成骨细胞的附着和增殖，并且所产生的孔径也有利于细胞向内生长。

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