以氧化铝纤维和玻璃粉为主体材料,活性炭粉为造孔剂,通过半干压成型工艺制备了高温烟气过滤陶瓷.详细研究了玻璃粉含量、造孔剂含量以及烧成温度对材料过滤阻力、抗折强度、显气孔率等性能的影响,并对原料配方和烧成制度进行了优化,最优配方为:氧化铝70wt%、玻璃粉30wt%、外加造孔剂25wt%、羧甲基纤维素钠8wt%,最佳的烧成温度为1100 ℃,制得的高温烟气过滤陶瓷抗折强度8.9 MPa,过滤阻力95 Pa,显气孔率达59%.
Filtering ceramic for high temperature exhaust gas was prepared by the half dry pressing molding using alumina fiber and glass powder as raw material and activated carbon as pore-forming agent.The effects of the glass powder content, pore-forming agent content and sintering temperature on the filtration resistance, bending strength and apparent porosity were studied.The raw material formula was optimized and optimum firing temperature was selected.The optimal formula is determined as 70wt% alumina fiber and 30wt% glass powder with addition of 25% pore-forming agent and 8wt% carboxymethyl cellulose.The suitable firing temperature is 1100 ℃.The porous ceramic filter prepared by optimum parameters exhibits the flexural strength of 8.9 MPa, filtration resistance of 95 Pa and apparent porosity rate of 59%.
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