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对新型人工骨材料磷酸钙骨水泥(CPC)浆体的微结构进行了研究,发现水化产物增多引起的浆体微结构变化是CPC凝结和硬化的本质原因。拌和时CPC浆体颗粒通过范德华分子力等较弱的力连成网状结构,随着水化产物增多,固体颗粒间距缩短,直至颗粒间发生结晶并接,网状结构逐渐转变为由化学键力连接,当浆体的塑性流动受化学键力的限制而终止时,浆体失去流动性而发生凝结。CPC浆体凝结后微结构继续变化,针状的羟基磷灰石产物使体系中毛细孔的数量和尺寸逐渐减小、固体颗粒间的结合强度逐渐提高,浆体强度随之增大而硬化。
The microstructure of a new type of artificial bone material, a calcium phosphate cement (CPC) slurry, was studied and it was found that the change in the microstructure of the slurry caused by the increase in the hydration product is the essential cause of the condensation and hardening of the CPC. During the mixing, the CPC slurry particles are connected into a network structure through weaker forces such as van der Waals’s molecular force. As the hydration products increase, the spacing between the solid particles is shortened until the particles are crystallized and connected, and the network structure gradually turns into a chemical bond force. When the plastic flow of the slurry is terminated by a chemical bond force, the slurry loses fluidity and coagulates. After the cement paste has been coagulated, the microstructure continues to change. The acicular hydroxyapatite product gradually decreases the number and size of capillary pores in the system, and the bonding strength between the solid particles gradually increases, and the slurry strength increases with hardening.