Nishimura F, Watari F, Nomoto S
Shika Zairyo Kikai. 1989 Jul;8(4):559-66.
Calcium oxide (CaO) slurry mixed with water hardens and expands by hydration. The authors used this setting characteristic as a binder of zirconia-refractory investments. If a mixed slurry was placed in air, unreacted residual calcia powders absorbed water and reverted to calcium hydroxide (Ca (OH)2). This resulted in a large setting expansion that continued for several days. A carbon dioxide (CO2) gas atmosphere controlled this expansion of calcia. When mixed slurry was placed in a carbon dioxide gas atmosphere, calcium carbonate (CaCO3) was formed and prevented the further hydration of unreacted calcium oxide. Thus setting expansion values were controlled. The combined expansion of setting and thermal expansion, in CaO-CO2-bonded zirconia investments, was about 1.5-2.5%. On the whole, calcium oxide is expected to be a good binder for high temperature dental casting refractory.
氧化钙（CaO）与水混合形成的浆料会通过水合作用硬化并膨胀。作者利用这种凝固特性作为氧化锆耐火包埋材料的粘结剂。如果将混合后的浆料置于空气中，未反应的残留氧化钙粉末会吸收水分并转化为氢氧化钙（Ca(OH)₂）。这会导致持续数天的大幅凝固膨胀。二氧化碳（CO₂）气体氛围可控制氧化钙的这种膨胀。当将混合浆料置于二氧化碳气体氛围中时，会形成碳酸钙（CaCO₃），从而阻止未反应的氧化钙进一步水合。因此，凝固膨胀值得到了控制。在CaO-CO₂粘结的氧化锆包埋材料中，凝固膨胀和热膨胀的综合膨胀率约为1.5 - 2.5%。总体而言，氧化钙有望成为高温牙科铸造耐火材料的良好粘结剂。
