【摘要】 以Si粉(粒度≤0.044mm)和聚乙烯醇水溶液(PVA,其中聚乙烯醇质量份数为5%)按一定比例混匀,过筛造粒,振动装料后进行冷等静压成型,研究了水分和PVA含量对硅粉坯体成型和性能的影响。研究表明:当水分含量大于1wt%时,粉料填充密度低,填充不均匀,导致压制时压缩比大,压缩不均匀,坯体外形不规整;当水分在0.5～1wt%时,硅粉填充密度较大,粉料的成型性较好,粉料中水分含量确定为0.5～1wt%。当加入的PVA的量从5wt%增加到15wt%时,坯体强度随PVA含量增加而增加;当加入的PVA的量从15%wt增加到25wt%时,坯体强度有降低的趋势,而且坯体中存在残余颗粒团聚体;当加入的聚乙烯醇溶液质量份数为15wt%时,坯体强度最大(约1.62MPa),并且不存在残余颗粒团聚体,确定粘结剂含量为15wt%。更多还原

【Abstract】 A uniform mixture of silicon powder (granularity≤0.044 mm) and polyvinyl alcohol solution (PVA, 5wt%) in response to a certain proportion has been prepared. After sieving, prilling and vibrating packing, the green body has been pressed. The effects of the amount of water and polyvinyl alcohol (PVA) on the moldability and the performance of green body were studied. when the amount of water is more than 1wt%, the packed density is low and inhomogeneous which makes the shape irregular for unequal pressing. When the amount of water is between 0.5~1wt%, the packed density is greater which makes the shape regular. The amount of water is determined to be 0.5~1wt%. When the amount of PVA increases from 5wt% to 15wt%, the strength of the green compacts also increases. When the amount of PVA increases from 15wt% to 25wt%, the strength of the green compacts decreases and hard aggregates remain in green bodies. When the amount of PVA is 15wt%, the strength of the green compacts is maximal (about 1.62MPa), and no residual hard aggregates are present in green bodies. The amount of PVA is determined to be 15wt%.更多还原