摘要
在磷酸钙骨水泥(CPC)中添加纳米二氧化硅(nSiO2)获得了nSiO2/CPC复合骨水泥。利用维卡仪、万能压力试验机和热导式等温量热仪研究了nSiO2的添加量对nSiO2/CPC复合骨水泥的凝结时间、抗压强度和水化行为的影响,利用X射线衍射和扫描电子显微镜等技术研究添加的nSiO2对nSiO2/CPC复合骨水泥固化产物的相组成和断面形貌的影响。研究结果表明:nSiO2添加量为5%的nSiO2/CPC复合骨水泥凝结时间由16 min缩短到10 min,抗压强度由原来的(24 2)MPa增加到(33 4)MPa,提高了38%,但添加超过5%的nSiO2会影响水化产物磷灰石的生成从而使复合骨水泥的力学强度下降。在水化反应过程中,一方面nSiO2作为填料,吸附了固化液中的水导致CPC的实际固液比增大,减弱了CPC的水化进程,由于实际固化液下降也减少了水化产物的孔隙大小和数目;另一方面,nSiO2与水化产生的Ca(OH)2发生化学反应形成CSH凝胶,改善了nSiO2和CPC基体之间的界面结合。这两方面的作用结果使得添加适量的nSiO2可以提高nSiO2/CPC复合骨水泥的抗压强度,缩短其凝结时间。
Nano SiO2/calcium phosphate cement（nSiO2/CPC） composite bone cements were prepared by adding nSiO2 into calcium phosphate cement（CPC）.The setting times,compressive strengths and exothermal behavior of nSiO2/CPC composite bone cements with the different nSiO2 contents were investigated by the Vicat needle,mechanical testing machine and isothermal conduction calo-rimetry.The phase composition and fracture morphologies of the nSiO2/CPC pastes were examined by X-ray diffraction and scanning electron microscopy.The results indicate that the setting time of nSiO2/CPC composite bone cements containing 5% nSiO2 decreases from 16 min to 10 min and its compressive strength increases from（24 ？ 2） MPa to（33 ？ 4） MPa,but when the nSiO2 content exceeds 5%（in mass）,growth of hydroxyapatite is retarded and the compressive strength of the composite bone cements decreases.In the process of hydration,on the one hand,nSiO2 acts as filler,and adsorbs free water from liquid solution,which results in increasing of the real P/L of CPC,and retarding the hydration of CPC.The diameter and number of the pores in nSiO2/CPC pastes decrease because of the increase of the real solid liquid ratio.On the other hand,the reaction of nSiO2 and Ca（OH）2 produced by hydration of CPC leads to form CSH gel,which improves the interface between nSiO2 filler and CPC matrix.Hence the nSiO2/CPC composite bone cements with short setting time and high compressive strength could be achieved by adding the appropriate nSiO2 amount.
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2012年第4期606-612,共7页
Journal of The Chinese Ceramic Society
基金
江苏省自然科学基金(BK2011076)
材料化学工程国家重点实验室开放基金(KL09–6)
江苏高校优势学科建设工程资助项目
关键词
磷酸钙
骨水泥
纳米二氧化硅
抗压强度
水化反应
calcium phosphate cement
nanosized silica
compressive strength
hydration
