溶出処理中の多孔質ガラスの割れ

概要

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Factors affecting cracking of porous glasses during leaching have been confirmed experimentally for two different composition glasses under leaching condition in which only leached or unleached layer shows cracking. When a glass exhibits swelling during leaching, cracks are developed in the unleached layer due to the generation of tensile stress in it. In contrast, when a glass shows shrinkage, the tensile stress generated in leached layer leads to cracking of this layer. To reduce this tensile stress, it is assumed to be very important that Na_2O in the SiO_2-rich phase is not he extracted and that SiO_2-gels in pores are removed. Experimental results showed that H_2O-leaching satisfies these requirements even for glasses which showed cracking due to swelling or shrinkage during typical acid leaching. In fact, a large amount of SiO_2-gels did not stay in pores and Na2_O was not extracted by H_2O leaching. It was noticed, however, that in further leaching with acid solution sometimes cracks developed in leached layer, deeding on the glass compositions and heating conditions.
社団法人日本セラミックス協会の論文
1990-11-01