水ガラスを粘結剤とし球状人工砂から造型した無機砂型の硬化及び崩壊機構

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タイトル別名
  • Cure and Collapse Mechanism of Inorganic Mold Using Spherical Artificial Sand and Water Glass Binder
  • ミズガラス オ ネンケツザイ ト シ キュウジョウ ジンコウ ズナ カラ ゾウケイ シタ ムキ スナガタ ノ コウカ オヨビ ホウカイ キコウ

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<p>  Artificial spherical sands were cured using water glass as a binder with or without addition of porous silica to prepare the test piece and aluminum alloy casting core. In order to clarify the curing and collapsibility mechanism of inorganic sand mold, the cross-linked structure between their particles were evaluated by SEM observation. A three-dimensional network of crosslinking bridges derived from water glass formed between the spherical particles enables the preparation of a core with sufficient strength for casting. The water glass added to cure the core requires less than 2wt% by weight for the sand prepared by the melting method and about a third as much as that prepared by the sintering method. The high collapsibility of such an inorganic mold is due to the rapid elongation of crosslinking bridges between the particles when heated above a certain temperature so that the particles are separated from each other. Especially for spherical particles with a smooth surface, the relatively small amount of water glass for curing would cause collapsibility accelerated by the thinning of the crosslinked body wall occurring simultaneously with elongation. Further more, the addition of porous silica would induce elongation at a lower temperature as compared to when poroussilica is not added, and is extremely effective for improving the collapsibility of the inorganic sand mold.</p>

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  • 鋳造工学

    鋳造工学 89 (8), 470-476, 2017

    公益社団法人 日本鋳造工学会

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