用于生物医学工程应用的硅酸钙/氧化铝复合材料的力学和物理性能。
Mechanical and physical properties of calcium silicate/alumina composite for biomedical engineering applications.
机构信息
Department of Mechanical Engineering and Advanced Material Research Center, University of Malaya, 50603, Kuala Lumpur, Malaysia.
Department of Mechanical Engineering and Advanced Material Research Center, University of Malaya, 50603, Kuala Lumpur, Malaysia; Department of Biomedical Engineering, Faculty of Engineering, University of Malaya, 50603 Kuala Lumpur, Malaysia.
出版信息
J Mech Behav Biomed Mater. 2014 Feb;30:168-75. doi: 10.1016/j.jmbbm.2013.10.024. Epub 2013 Nov 7.
The focus of this study is to investigate the effect of Al2O3 on α-calcium silicate (α-CaSiO3) ceramic. α-CaSiO3 was synthesized from CaO and SiO2 using mechanochemical method followed by calcinations at 1000°C. α-CaSiO3 and alumina were grinded using ball mill to create mixtures, containing 0-50w% of Al2O3 loadings. The powders were uniaxially pressed and followed by cold isostatic pressing (CIP) in order to achieve greater uniformity of compaction and to increase the shape capability. Afterward, the compaction was sintered in a resistive element furnace at both 1150°C and 1250°C with a 5h holding time. It was found that alumina reacted with α-CaSiO3 and formed alumina-rich calcium aluminates after sintering. An addition of 15wt% of Al2O3 powder at 1250°C were found to improve the hardness and fracture toughness of the calcium silicate. It was also observed that the average grain sizes of α-CaSiO3 /Al2O3 composite were maintained 500-700nm after sintering process.
本研究的重点是研究 Al2O3 对 α-硅酸钙（α-CaSiO3）陶瓷的影响。α-CaSiO3 是通过 CaO 和 SiO2 采用机械化学法合成的，然后在 1000°C 下煅烧。α-CaSiO3 和氧化铝通过球磨混合磨碎，以形成包含 0-50w%Al2O3 负载量的混合物。将粉末单向压制，然后进行冷等静压（CIP），以达到更均匀的压实度并提高形状能力。然后，在电阻元件炉中于 1150°C 和 1250°C 下烧结 5 小时。发现氧化铝与 α-CaSiO3 反应，在烧结后形成富铝的钙铝酸盐。在 1250°C 下添加 15wt%的 Al2O3 粉末被发现可以提高硅酸钙的硬度和断裂韧性。还观察到 α-CaSiO3/Al2O3 复合材料的平均晶粒尺寸在烧结后保持在 500-700nm。
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