羧甲基纤维素钠加入量对镁铝尖晶石质多孔隔热材料性能的影响
Effect of sodium carboxymethyl cellulose addition on properties of MgAl2O4 porous insulation materials
矫长发 1李国华 1孙格格 1田琳 1康驰1
作者信息
- 1. 辽宁科技大学材料与冶金学院 辽宁鞍山 114051
- 折叠
摘要
为提高热工窑炉的能源利用效率,首先将质量比为35:65的中档镁砂细粉与煅烧氧化铝粉混合、烘干、破碎至d50=2.3μm的混合粉;然后分别引入不同量的稳泡剂羧甲基纤维素钠(CMC)和0.6％(w)的发泡剂油酸钾,制得泡沫料浆;最后将泡沫料浆注入40 mm×40 mm×40 mm模具中,脱模,经110 ℃保温24 h干燥,再经1 500 ℃保温3 h烧后,制备了镁铝尖晶石质多孔隔热材料.研究了 CMC加入量(外加质量分数分别为0、0.1％、0.2％、0.3％、0.4％、0.5％)对料浆和烧后试样性能的影响.结果表明:1)当CMC加入量大于0.1％(w)后,料浆膨胀比降低,黏度增大,气泡数量减少,气泡平均直径变小.2)当CMC加入量为0.2％(w)时,料浆的Zeta电位绝对值最大,为18.3 mV,此时料浆最稳定;烧后试样内部的气孔为球形封闭气孔,数量最多,此时试样的显气孔率为73.5％,体积密度为0.95 g·cm-3,常温耐压强度为13.1 MPa.
Abstract
This work aims at improving the energy utilization efficiency of kilns.Magnesium aluminate spinel porous insulation materials were prepared as follows.Medium-grade magnesia fine powder and calcined alumina powder were mixed in a mass ratio of 35:65,dried,and crushed into powders of d50=2.3 μm.Then different amounts of sodium carboxymethyl cellulose(CMC)as a foam stabilizer and 0.6 mass％potassi-um oleate as a foaming agent were added to obtain the foaming slurry.Finally the slurry was injected into molds of 40 mm×40 mm×40 mm,demolded,dried at 110 ℃ for 24 h,and fired at 1 500 ℃ for 3 h.The effects of the CMC addition(0,0.1％,0.2％,0.3％,0.4％,and 0.5％,by mass,extra adding)on the prop-erties of the slurry and the fired samples were studied.The results show that:(1)when the CMC addition is higher than 0.1％,the slurry has decreased expansion ratio,increased viscosity,and less and smaller bub-bles;(2)when the CMC addition is 0.2％,the slurry has the maximum Zeta potential absolute value of 18.3 mV,which is the most stable;the sample has the most pores,which are spherical and closed;the ap-parent porosity,bulk density,and cold compressive strength of the sample are 73.5％,0.95 g·cm-3,and 13.1 MPa.
关键词
多孔隔热材料/镁铝尖晶石/羧甲基纤维素钠Key words
porous insulation materials/magnesium aluminate spinel/sodium carboxymethyl cellulose引用本文复制引用
基金项目
国家重点研发计划项目(2017YFB0310701)
出版年
2024
NETL
NSTL
万方数据