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1 膨润土粘结剂 当水和膨润土的混合物覆盖砂粒时,就形成了砂粒的膨润土粘结。而要形成有粘结剂的砂粒必须对造型砂混砂工艺中需进行充分控制的因素进行研究。我们只能将其概括为一点,将注意力集中于主要因素,这就是粘结剂的机理。 粘结剂:当用水湿润后并被挤压成强度测试的试块,当含水量相同时美国西部钠基膨润土和南部钙基膨润土二者的湿粘结强度是一样的。随着水份增加其强度先增后降。经测量最大强度接近于7.8kg/cm~2。当水份适合造型砂粘结剂时,湿粘结剂显示出类似于坚硬但略脆的成形粘土的结构。当用于造型时粘结剂不是成稀浆状态,对其变形抗力需要相当大的作用力(或混和力)。当先前
1 bentonite binder When a mixture of water and bentonite covers the sand, it forms a bentonite bond of the sand. And to form a binder of sand must be sand molding sand molding process to be fully controlled factors. We can only sum it up to a point, focusing on the main factors, which is the binder mechanism. Binder: When wetted with water and extruded into a strength test block, the wet bond strength is the same for both sodium-based bentonite and southern calcium bentonite at the same moisture content. As water increases its intensity increases first and then decreases. The maximum intensity measured is close to 7.8kg / cm ~ 2. When the moisture is suitable for modeling sand binders, the wet binders show a structure similar to that of hard but slightly brittle shaped clay. When used in modeling, the binder is not slurried and requires considerable force (or mixing force) on its deformation resistance. When earlier