A post-treatment of hydrothermal process was conducted to evaluate its effects on the material characteristics and mechanical properties of plasma-sprayed pure HA and HA/20% YSZ coatings.Surface morphology and microst...A post-treatment of hydrothermal process was conducted to evaluate its effects on the material characteristics and mechanical properties of plasma-sprayed pure HA and HA/20% YSZ coatings.Surface morphology and microstructural changes,relative element contents as well as phase transformations were analyzed by scanning electron microscopy,energy dispersive spectroscopy,and X-ray diffractometry.Both microhardness and Young’s modulus were measured.CaCO3 was found existing before and after the whole process of post-treatment.Peaks of impurity phases such as CaO,TCP,and TTCP of as-sprayed coatings were observed to disappear while HA peaks show a tendency of getting higher and wider over time.Surface morphology of SEM analysis presents a clear deposition behavior of ultrafine HA crystallized particles and cross-sectional analysis exhibits a dense and fine structure.Mechanical properties of HA/20%YSZ coatings are found to be significantly higher than those of pure HA coatings and both of which displayed an overall increase with the heating time,indicating enhanced performances.展开更多
A composite of nanocrystalline hydroxyapatite(n HA) and polyamide PA was prepared by the chemical methods of co precipitation and hydrothermal treatment. Hydrothermal treatment not only conduced to the formation of n ...A composite of nanocrystalline hydroxyapatite(n HA) and polyamide PA was prepared by the chemical methods of co precipitation and hydrothermal treatment. Hydrothermal treatment not only conduced to the formation of n HA but also enabled PA to be connected with n HA tightly. Using these methods, a dense composite powder containing high n HA /PA ratio (>50%) was obtained.展开更多
基金the National Natural Science Foundation of China(No.51475346)。
文摘A post-treatment of hydrothermal process was conducted to evaluate its effects on the material characteristics and mechanical properties of plasma-sprayed pure HA and HA/20% YSZ coatings.Surface morphology and microstructural changes,relative element contents as well as phase transformations were analyzed by scanning electron microscopy,energy dispersive spectroscopy,and X-ray diffractometry.Both microhardness and Young’s modulus were measured.CaCO3 was found existing before and after the whole process of post-treatment.Peaks of impurity phases such as CaO,TCP,and TTCP of as-sprayed coatings were observed to disappear while HA peaks show a tendency of getting higher and wider over time.Surface morphology of SEM analysis presents a clear deposition behavior of ultrafine HA crystallized particles and cross-sectional analysis exhibits a dense and fine structure.Mechanical properties of HA/20%YSZ coatings are found to be significantly higher than those of pure HA coatings and both of which displayed an overall increase with the heating time,indicating enhanced performances.
文摘A composite of nanocrystalline hydroxyapatite(n HA) and polyamide PA was prepared by the chemical methods of co precipitation and hydrothermal treatment. Hydrothermal treatment not only conduced to the formation of n HA but also enabled PA to be connected with n HA tightly. Using these methods, a dense composite powder containing high n HA /PA ratio (>50%) was obtained.
