A Study of Chemical Composition, Vickers Hardness and Chemical Durability for Bioglass

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  • バイオガラスのガラス組成，ビッカース硬度と化学的耐久性の検討
  • バイオ ガラス ニ カンスル キソテキ ケンキュウ 1 バイオ ガラス ノ ガ
  • バイオガラスに関する基礎的研究, 第1報

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The chemical durability and the binding mechanism of bioglasses with living tissues have been studied by L. L. Hench. The components contained in those glasses, Na2O, CaO, SiO2 and P2O5, are regarded as the indispensable components for the bioglass. But these bioglasses studied by Hench have not been made fit for practical use yet, because of a serious defect that the mechanical strength decreases with time after implantation. In the present experiments, the glasses of Na2O-CaO-SiO2-P2O5-Al2O3 series, Na2O-CaO-SiO2-P2O5-B2O3 series and Na2O-CaO-SiO2-P2O5-B2O3-Al2O3 series containing Al2O3 and B2O3 as the new components have been studied on chemical durability and Vickers hardness. Al2O3 and B2O3 contained in these glasses may be expected to increase the chemical durability and the mechanical strength. The chemical durability was measured on the HCl solution of pH=1.0, pH=3.0 and pH=5.0. Some interesting results are obtained in Vickers hardness. The Vickers hardness of the X series glasses increased with increasing SiO2. Those of the E and F series glasses exhibited maxima at the mol% ratio, B2O3/P2O5 equal to unity and at the mol% ratio, (B2O3+Al2O3)/P2O5 equal to two, respectively. These properties were generally determined in connection with the composition. From the measurements of these properties, the bioglasses of E 15, A 20 and A 30 were shown to be better than Hench (45 S 5) glass.

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