针对电磁泵用碳化硅耐火材料发生铝液的渗透破坏问题,采用负压液相浸渍技术使碳化硅耐火材料表面致密化.利用静力天平、SEM与ImageJ,对比研究了浸渍剂、浸渍工艺对碳化硅试体表面致密化效果的影响,并对浸渍剂和浸渍工艺进行了优化.结果表明:采用Ca_3(PO_4)_2、AlPO_4与纳米SiO_2饱和混合溶液浸渍、浸渍-干燥-烧结重复4次的浸渍工艺可得到最佳的表面致密化效果:表面孔隙率由9.3%降为0.1%、表面最大孔径由182 μm降为3.8 μm,吸水率由11.15%降为1.89%.
In view of the molten aluminum seepage destruction problem of the electromagnetic pump with the SiC refractory, the surface densification of SiC refractory applying negative pressure liquid impregnation technology was discussed. The impregnating agent and impregnating process was studied and optimized by static balance, SEM and ImageJ. The results show that surface densification of SiC refractory has the best effect by impregnating-drying-sintering (repeated four times) with Ca_3(PO_4)_2, AlPO_4 and nano-SiO_2 mixed saturated solution. The superficial porosity reduced from 9.3% to 0.1%, and the biggest superficial aperture from 182 μm to 3.8 μm and the water absorption from 11.15% to 1.89%.
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