利用冷冻塑形法制备了具有定向孔隙结构的大孔磷酸钙骨水泥支架。利用扫描电镜(scanning electron microscope,SEM)和X射线衍射(X-ray diffraction,XRD)对材料的孔隙结构和物相进行了研究。SEM照片显示:多孔磷酸钙骨水泥具有与冰晶生长...利用冷冻塑形法制备了具有定向孔隙结构的大孔磷酸钙骨水泥支架。利用扫描电镜(scanning electron microscope,SEM)和X射线衍射(X-ray diffraction,XRD)对材料的孔隙结构和物相进行了研究。SEM照片显示:多孔磷酸钙骨水泥具有与冰晶生长方向一致的相互连通的大孔。开口大孔的尺寸在径向能达到150～200μm,在轴向能达到500～1000μm。孔隙的大小可以通过改变冷冻参数进行调节。XRD谱显示:多孔磷酸钙骨水泥中的主要相为弱结晶的羟基磷灰石。材料的孔隙率可以通过调整液固比在70%到90%之间进行调节。实验制备的大孔磷酸钙骨水泥支架是很有希望的骨组织工程支架材料。展开更多
Porous Y2Si05 ceramic was fabricated by freeze casting with tert-butyl alcohol as solvent. The porous Y2SiO5 ceramic possessed long straight pore structure. With decreasing solid loading from 20 to 10 vol.%, the poros...Porous Y2Si05 ceramic was fabricated by freeze casting with tert-butyl alcohol as solvent. The porous Y2SiO5 ceramic possessed long straight pore structure. With decreasing solid loading from 20 to 10 vol.%, the porosity of the Y2SiO5 ceramic increased linearly from 45% to Y2%, while the compressive strength declined from 23.2 to 3.2 MPa. The thermal conductivity of Y2SiO5 decreased from 2.34 W/mK for the dense bulk to 0.05 W/mK for the porous body with a porosity of 57%.展开更多
文摘以莰烯为分散介质,木炭粉为碳源,改性聚酯类高分子化合物为分散剂,在56℃条件下恒温球磨,制备出了莰烯基木炭粉料浆。研究了分散剂种类及其用量、恒温球磨时间对料浆流变性能的影响。在优化的工艺条件下,制备出了固相含量为40 vol%的料浆,料浆在50 s-1剪切速率下的粘度为70 m Pa·s,能满足室温冷凝浇注成型工艺的要求。
文摘利用冷冻塑形法制备了具有定向孔隙结构的大孔磷酸钙骨水泥支架。利用扫描电镜(scanning electron microscope,SEM)和X射线衍射(X-ray diffraction,XRD)对材料的孔隙结构和物相进行了研究。SEM照片显示:多孔磷酸钙骨水泥具有与冰晶生长方向一致的相互连通的大孔。开口大孔的尺寸在径向能达到150～200μm,在轴向能达到500～1000μm。孔隙的大小可以通过改变冷冻参数进行调节。XRD谱显示:多孔磷酸钙骨水泥中的主要相为弱结晶的羟基磷灰石。材料的孔隙率可以通过调整液固比在70%到90%之间进行调节。实验制备的大孔磷酸钙骨水泥支架是很有希望的骨组织工程支架材料。
基金Project(52265043)supported by the National Natural Science Foundation of ChinaProject(2021A1515010470)supported by the Natural Science Foundation of Guangdong Province,China+1 种基金Project(ZK2023(014))supported by the Guizhou Provincial Science and Technology Projects,ChinaProject(YQK[2023]011)supported by the Outstanding Youth Science and Technology Talent Project of Guizhou Province,China。
文摘Porous Y2Si05 ceramic was fabricated by freeze casting with tert-butyl alcohol as solvent. The porous Y2SiO5 ceramic possessed long straight pore structure. With decreasing solid loading from 20 to 10 vol.%, the porosity of the Y2SiO5 ceramic increased linearly from 45% to Y2%, while the compressive strength declined from 23.2 to 3.2 MPa. The thermal conductivity of Y2SiO5 decreased from 2.34 W/mK for the dense bulk to 0.05 W/mK for the porous body with a porosity of 57%.
