【摘要】 将０．２％ＬｉＯＨ与３．５％的水玻璃相混合加入砂中，可使型砂的σ２４ｈ达到２．３９ＭＰａ。将这种改性水玻璃存放半年加入砂中，型砂的σ即时、σ２４ｈ不但没有降低，反而有明显的提高。将改性水玻璃与粉状混合物Ｇ配合使用，型砂８００℃的残留强度降至０．２８ＭＰａ。更多还原

【Abstract】 water glass added first by 0 2% LiOH,was mixed with the silica sand,the σ 24h strength of which reached 2 39 MPa.If the modified water glass is stored for half a year,the σ as gassed and σ 24h strength of the modified silicate sand were increased markedly.When powdered material G is incorporated in the modified silicate,the retained strength of the molding sand at 800℃ is reduced down to 0 28 MPa.更多还原