欧洲专利US2015174644为了解决铸件表面出现的粘砂缺陷,本专利提供了一种添加有硫酸钡附加物的水玻璃砂,特别是在浇注铝合金铸件时,可以获得无粘砂表面光洁的铸件。因为硫酸钡具有耐热性较高、对铝液不润湿、不反应的特点,可有效防止铝液渗入型芯砂的空隙中。 European patent US2015174644 In order to solve the sticky sand surface defects appear castings, this patent provides a sodium silicate added barium sulfate addition sand, especially in casting aluminum alloy castings, you can get smooth surface without casting sand castings. Because barium sulfate with high heat resistance, the liquid aluminum is not wetting, non-reactive features, which can effectively prevent the infiltration of liquid aluminum core sand gap.