マグネシアとシリカの気相反応

概要

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Vapor transport reaction of sintered polycrystalline MgO and quartz glass was examined using vapor transport couple. MgO and SiO2 were separated by 0.1mm platinum wire and firing was carried out at 1400°C for 24hrs.X-ray examination of the surface of MgO and SiO2 did not establish the development of reaction product. However, electron microprobe X-ray analysis proved the vapor transport of Si (or Si oxide) to the surface of MgO as well as that of Mg (or MgO) to the surface of SiO2. In addition, it was found that the amount of Si on the MgO surface was considerably larger than that of Mg on the SiO2 surface.Previous study using MgO-SiO2 contact diffusion couple indicated that the reaction product mainly developed on the SiO2 side. Therefore, it will be concluded that vapor transport did not play an important part on the development of the reaction product in the solid state reaction.Platinum wire had an shielding effect on the vapor transport of Mg, but, on the other hand, there was evidence of the rapid movement of MgO toward SiO2 along the surface of platinum wire.
社団法人日本セラミックス協会の論文
1969-07-01