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An improved sodium silicate binder modified by ultra-fine powder materials 被引量:5
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作者 WANG Ji-na FAN Zi-tian +2 位作者 WANG Hua-fang DONG Xuan-pu HUANG Nai-yu 《China Foundry》 SCIE CAS 2007年第1期26-30,共5页
This paper presents a new method of modifying sodium silicate binder with ultra-fine powders. The sodium silicate binder modified by ultra-fine powder A and the organic B can reduce the addition amount of the binder. ... This paper presents a new method of modifying sodium silicate binder with ultra-fine powders. The sodium silicate binder modified by ultra-fine powder A and the organic B can reduce the addition amount of the binder. The results indicate that the 24 h strength has increased by 39.9% at room temperature and the residual strength has decreased by 30.7% at 800℃, compared to the conventional sodium silicate. An available material to improve the moisture resistance was also found by adding about 2% more inorganic C, and it can increase the moist strength by 20%. In the end, the microanalyses are given to explain the modifying machanism, i. e., the ultra-fine powder A can refine the sodium silicate binder to avoid holes in the binder bond, which can increase the 24 h strength at room temperture, and can lead to more cracks in the bond after the molding sand is heated to 800℃. This is because of the stress caused by the new eutectic complex of modified sodium silicate binder. 展开更多
关键词 sodium silicate binder modification ultra-fine powder materials bonding strength moisture resistance COLLAPSIBILITY
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