稀土La_2O_3对尾矿微晶玻璃显微结构和裂纹扩展行为的影响
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摘要
利用白云鄂博东尾矿和粉煤灰等固体废弃物为原料,采用传统熔融法制备Ca O-Al2O3-Mg O-Si O2(CAMS)系尾矿微晶玻璃,通过XRD、DTA和拉曼光谱仪等手段表征La2O3对微晶玻璃析晶特性的影响,并对密度、抗折强度和维氏硬度进行了讨论。通过分析维氏压痕裂纹揭示La2O3对尾矿微晶玻璃显微结构和裂纹扩展行为的影响。结果表明,随着La2O3的添加微晶玻璃的析晶放热峰逐渐右移,析晶程度呈弱化趋势,但是其主晶相没有改变。La2O3的添加引起微晶玻璃内相关元素聚集,改变了微晶玻璃的显微结构。元素聚集抑制了微晶玻璃的裂纹扩展,进而提高了维氏硬度和抗折强度。
Tailing glass-ceramics of quaternary Ca O-Al2 O3-Mg O-Si O2(CAMS) are prepared by traditional melting method with solid waste such as Bayan Obo east mine tailing and fly ash as main raw materials. The effect of La2 O3 on crystallization characteristics, microstructure, bending strength, Vickers hardness and crack propagation behavior of glass-ceramics are characterized by X-ray diffractometer(XRD), differential thermal analysis(DTA) measurement and Raman spectroscopy, bending tester and Vickers hardness tester. The results show that with the increase amount of La2 O3, the crystallization temperature of the as-cast glasses shifts to higher temperature; the crystalline degree is gradually decreased but the main crystalline phase does not change. The addition of La2 O3 leads to the aggregation of elements and the microstructure variation of glass-ceramics, which thereby suppress the crack propagation of glass-ceramics. As a result, the Vickers hardness and bending strength of glass-ceramics increased.
Tailing glass-ceramics of quaternary Ca O-Al2 O3-Mg O-Si O2(CAMS) are prepared by traditional melting method with solid waste such as Bayan Obo east mine tailing and fly ash as main raw materials. The effect of La2 O3 on crystallization characteristics, microstructure, bending strength, Vickers hardness and crack propagation behavior of glass-ceramics are characterized by X-ray diffractometer(XRD), differential thermal analysis(DTA) measurement and Raman spectroscopy, bending tester and Vickers hardness tester. The results show that with the increase amount of La2 O3, the crystallization temperature of the as-cast glasses shifts to higher temperature; the crystalline degree is gradually decreased but the main crystalline phase does not change. The addition of La2 O3 leads to the aggregation of elements and the microstructure variation of glass-ceramics, which thereby suppress the crack propagation of glass-ceramics. As a result, the Vickers hardness and bending strength of glass-ceramics increased.
引文
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[2]Ye C Q,He F,Shu H,et al.Preparation and properties of sintered glass-ceramics containing Au-Cu tailing waste[J].Mater.Des.,2015,86:782
[3]Zheng W H,Cao H,Zhong J B,et al.Ca O-Mg O-Al2O3-Si O2glassceramics from lithium porcelain clay tailings for new building materials[J].J.Non-Cryst.Solids,2015,409:27
[4]Li B W,Li H X,Zhang X F,et al.Nucleation and crystallization of tailing-based glass-ceramics by microwave heating[J].Int.J.Miner.Metall.Mater.,2015,22(12):1342
[5]Li B W,Deng L B,Zhang X F,et al.Preparation and corrosion behavior of glass-ceramics tubes made of Bayan Obo tailings and fly ash[J].Int.J.Appl.Ceram.Technol.,2015,12(S3):41
[6]Li B W,Deng L B,Zhang X F,et al.Structure and performance of glass-ceramics obtained by Bayan Obo tailing and fly ash[J].J.Non-Cryst.Solids,2013,380:103
[7]Li B W,Du Y S,Zhang X F,et al.Crystallization characteristics and properties of high-performance glass-ceramics derived from Baiyunebo east mine tailing[J].Environ.Prog.Sustainable Energy,2015,34(2):420
[8]Li B W,Du Y S,Zhang X F,et al.Effects of iron oxide on the crystallization kinetics of Baiyunebo Tailing glass-ceramics[J].Trans.Ind.Ceram.Soc.,2013,72(2):119
[9]Li B W,Du Y S,Zhang X F,et al.Effect of reducing agent on the crystallization characteristics and properties of Baiyunebo east mine tailing glass-ceramics[J].J.Ceramic.Process Res.,2014,15(5):325
[10]Chen H,Li B W,Zhao M,et al.Effect of existence form of La3+on the properties of the Bayan Obo mine tailing glass ceramics[J].Acta Phys.Sin.,2015,64(19):196201(陈华,李保卫,赵鸣等.La3+存在形式对白云鄂博稀选尾矿微晶玻璃性能的影响[J].物理学报,2015,64(19):196201)
[11]Chi Y S,Shen J Y,Chen X X,et al.Role of La2O3in Mg O-Al2O3-Si O2-Ti O2glass-ceramics[J].J.Inorg.Mater.,2002,17(2):348(迟玉山,沈菊云,陈学贤等.La2O3在Mg O-Al2O3-Si O2-Ti O2微晶玻璃中的作用[J].无机材料学报,2002,17(2):348)
[12]Luo Z W,Lu A X,Han L G.Effects of doping La2O3on crystallization and mechanical properties of lithium disilicate glass-ceramics[J].Chin.J.Nonferrous.Met.,2009,19(11):2018(罗志伟,卢安贤,韩立国.La2O3掺杂对二硅酸锂微晶玻璃析晶行为和力学性能的影响[J].中国有色金属学报,2009,19(11):2018)
[13]Abdoli H,Alizadeh P,Boccaccini D,et al.Fracture toughness of glass sealants for solid oxide fuel cell application[J].Mater.Lett.,2014,115(2):75
[14]Du Y S,Zhang H X,Chen H,et al.Effect of crystallization temperature on crystallization characteristics and properties of Baiyunebo east mine tailing glass-ceramics[J].Mater.Rev.:Res.,2015,29(16):120(杜永胜,张红霞,陈华等.晶化温度对白云鄂博东尾矿微晶玻璃析晶及性能的影响[J].材料导报:研究篇,2015,29(16):120)
[15]Chen L,Yu C L,Hu L L,et al.Effect of La2O3on the physical and crystallization properties of Co2+doped Mg O-Al2O3-Si O2glass[J].J.Non-Cryst.Solids,2013,360(360):4
[16]Chen J H,Li Y H,Wu Y,et al.Study on formation condition of calcium iron silicate ferromagnetic glass-ceramics[J].Mater.Rev.,2000,14(5):54(陈建华,李玉华,吴勇等.钙铁硅铁磁体微晶玻璃形成条件的研究[J].材料导报,2000,14(5):54)
[17]Lu P,Zheng Y,Cheng J S,et al.Effect of La2O3addition on crystallization and properties of Li2O-Al2O3-Si O2glass-ceramics[J].Ceram.Int.,2013,39(7):8207
[18]Huang E,Chen C H,Huang T,et al.Raman spectroscopic characteristics of Mg-Fe-Ca pyroxenes[J].Am.Mineral,2000,85(4):473
[19]Ouyang S L,Li B W,Zhang X F,et al.Spectroscopic research on slag nanocrystal glass ceramics containing rare earth element[J].Spectrosc.Spect.Anal.,2015,35(8):2316(欧阳顺利,李保卫,张雪峰等.含稀土元素的矿渣纳米晶玻璃陶瓷的光谱学研究[J].光谱学与光谱分析,2015,35(8):2316)
[20]Janusz P,Magdalena L.Preparation of glass-ceramic glazes in the Si O2-Al2O3-Ca O-Mg O-K2O-Na2O-Zn O system by variable content of Zn O[J].Ceram.Int.,2016,42(7):8513
[21]Cheng J S,Tian P J,Zheng W H,et al.Preparation and spectral analysis of a new Tb3+doped Ca O-Mg O-Si O2glass ceramics[J].J.Alloy Compd.,2009,471(1):470
[22]Jin Y H,Deng Z D,Ying T Z.Effects of La2O3on structures and properties of Li2O-Al2O3-Si O2glass-ceramics[J].Foshan Ceram.2002,12(7):5(金迎辉,邓再德,英庭照.稀土La2O3对Li2O-Al2O3-Si O2微晶玻璃结构和性能的影响[J].佛山陶瓷,2002,12(7):5)
[23]Goel A,Tulyaganov D U,Kharton V V,et al.The effect of Cr2O3addition on crystallization and properties of La2O3-containing diopside glass-ceramics[J].Acta Mater.,2008,56(13):3065
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[26]Cook RF,Pharr G M.Direct observation and analysis of indentation cracking in glasses and ceramics[J].J.Am.Ceram.Soc.,1990,73(4):787