Effect of molding pressure on fabrication of low-crystalline calcite block
Effect of molding pressure on fabrication of low-crystalline calcite block
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DOI：
10.1007/s10856-006-0028-7
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发表时间：
2008-02-01
影响因子：
3.7
通讯作者：
Ishikawa, Kunio
中科院分区：
文献类型：
--
作者：
Lin, Xin;Matsuya, Shigeki;Ishikawa, Kunio
我们曾报道，将氢氧化钙压块置于饱和水蒸气的二氧化碳气体中，可以制备出低结晶多孔方解石块，作为骨替代材料或制备磷灰石型骨填充材料的原料。在本研究中，我们研究了成型压力对氢氧化钙向方解石的转变以及碳化压坯机械强度的影响。在72h内基本完成了向方解石的转化，但在较高的成型压力下，少量的Ca(OH)(2)仍未发生反应，这是由于Ca(OH)(2)颗粒的致密堆积导致CO(2)气体未完全渗透到颗粒间空间。另一方面，较高的成型压力导致方解石压坯的径向拉伸强度(DTS)增加。方解石块的临界孔隙率约为68%。
We have reported that low-crystalline porous calcite block, which is useful as a bone substitute or a source material to prepare apatite-type bone fillers could be fabricated by exposing calcium hydroxide compact to carbon dioxide gas saturated with water vapor. In the present study, we investigated the effect of molding pressure on the transformation of calcium hydroxide into calcite and the mechanical strength of the carbonated compact. Transformation into calcite was almost completed within 72 h, however, a small amount of Ca(OH)(2) still remained unreacted at higher molding pressure because of incomplete penetration of CO(2) gas into the interparticle space due to dense packing of Ca(OH)(2) particles. On the other hand, high molding pressure resulted in an increase in diametral tensile strength (DTS) of the calcite compact formed. Critical porosity of the calcite block was calculated as approximately 68%.