SiC添加量对表面改性的酸洗铜矿尾渣烧结多孔微晶玻璃的气孔结构及其性能影响  

Effect of SiC on Pore Structure and Physical Properties of Porous Glass-ceramics Derived from Surface Modified Pickling Copper Mine Tailings

作　　者：边太义 蔡小龙 王鑫顺 卢金山[1] BIAN Taiyi;CAI Xiaolong;WANG Xinshun;LU Jinshan(School of Materials Science and Engineering,Nanchang Hangkong University,Nanchang 330063,Jiangxi,China)

机构地区：[1]南昌航空大学材料科学与工程学院,江西南昌330063

出　　处：《陶瓷学报》2024年第4期782-789,共8页Journal of Ceramics

基　　金：国家自然科学基金(52060020);南昌航空大学大学生创新创业项目(2023ZD012)。

摘　　要：以表面改性的酸洗铜矿尾渣粉体为主要原料,以铝溶胶(1 wt.%)为烧结助剂,以SiC(0 wt.%~5.0 wt.%)为发泡剂,烧结制备多孔微晶玻璃,研究SiC添加量对微晶玻璃的气孔结构、抗压强度和热导率的影响。随着SiC添加量增大,多孔微晶玻璃中发泡剂产生的气孔与基体中残留孔隙贯通聚并,形成较大孔隙,气孔率先增大后减小,抗压强度和比强度持续降低,热导率先减小后增大。当添加2.0 wt.%SiC时,多孔微晶玻璃气孔率为45.6%,抗压强度和热导率分别为60.4 MPa和0.828 W·m^(-1)·K^(-1)。热导率的理论计算结果表明,当气孔率较低时,气孔聚并使得热导率理论值高于实测值;当气孔率较高时,理论值与实测值基本一致,表明聚并后气孔为闭合孔隙结构。这种红色多孔微晶玻璃有望应用于轻质装饰建筑材料,实现尾渣资源化增值利用。Porous glass-ceramics were derived from surface-modified pickling copper mine tailing powder with boehmite sol(1 wt.%)as the sintering additive and SiC(0–5.0 wt.%)as the foaming agent.The effect of SiC on pore structure,compressive strength and thermal conductivity of the glass-ceramics were systematically studied.With increasing content of SiC,the pores generated by the blowing agent in the porous glass-ceramics gradually connected and coalesced with the residual pores in the matrix to form larger pores.The porosity first increased and then decreased,the compressive strength and specific strength continued to decrease,and the thermal conductivity first decreased and then increased.With 2.0 wt.%SiC,the porosity of porous glass-ceramics is 45.6%,while the compressive strength and thermal conductivity are 60.4 MPa and 0.828 W·m^(-1)·K^(-1),respectively.The theoretical value of thermal conductivity is higher than the measured value at low porosity,while the theoretical value is basically the same as the measured value at high porosity,indicating that the pores are of closed structure after coalescence.These red porous glass-ceramics are suitable for lightweight decorative building materials,thus realizing the value-added utilization of copper mine tailings.

关 键 词：铜矿尾渣 多孔微晶玻璃 气孔结构 抗压强度 比强度 热导率 

分 类 号：TQ174.75[化学工程—陶瓷工业]