蓝晶石含量对球形45莫来石轻骨料浇注料显微结构及性能的影响
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摘要
为改善含球形45莫来石轻骨料浇注料的体积稳定性和显微结构,引入了不同含量的蓝晶石(w=8%、10%、12%、14%、16%)。采用X-射线衍射仪、扫描电子显微镜等对1300℃保温3 h煅烧后试样的物相组成、显微结构与性能进行了表征。研究发现:随着蓝晶石含量的增加,1300℃煅烧后试样的强度显著降低,线变化率由-0.87%逐渐增加至0.64%,骨料基质结合程度先变好后变差。综合考虑各项性能,含12%蓝晶石的试样综合性能最优:1.73g/cm3的体积密度,36.8%的显气孔率,29.3 MPa的耐压强度,0.18%的线变化率,0.58 W/(m·K)的导热系数(800℃)和1339℃(T_(0.6))的荷重软化温度。
In order to improve the volume stability and microstructure of the lightweight mullite castables which used the spherical shape lightweight mullite(M45) as aggregates,five castables with different contents of kyanite(w = 8% 、10% 、12% 、14% and 16%) were prepared.The phase compositions,microstructures and physical properties of the specimens sintering at 1300 ℃ for 3 h were investigated through x-ray diffractometer(XRD),scanning election microscopy(SEM),etc.The results show that,for the specimens sintered at 1300 ℃,with the kyanite content increased from 8wt% to 16wt%,the strengths decreased significantly when the linear change rates increased from-0.87% to 0.64%,and the bonding between matrix and aggregate got better first and then got poor.The most apposite mode is the sample containing 12% kyanite,which had a bulk density of 1.73 g/cm~3,an apparent porosity of 36.8%,a high crushing strength of 29.3 MPa,a low linear change rate of 0.18%,a thermal conductivity of 0.58 W/(m·K) at 800 ℃ and a refractoriness under load(T_(0.6)) of 1339 ℃.
In order to improve the volume stability and microstructure of the lightweight mullite castables which used the spherical shape lightweight mullite(M45) as aggregates,five castables with different contents of kyanite(w = 8% 、10% 、12% 、14% and 16%) were prepared.The phase compositions,microstructures and physical properties of the specimens sintering at 1300 ℃ for 3 h were investigated through x-ray diffractometer(XRD),scanning election microscopy(SEM),etc.The results show that,for the specimens sintered at 1300 ℃,with the kyanite content increased from 8wt% to 16wt%,the strengths decreased significantly when the linear change rates increased from-0.87% to 0.64%,and the bonding between matrix and aggregate got better first and then got poor.The most apposite mode is the sample containing 12% kyanite,which had a bulk density of 1.73 g/cm~3,an apparent porosity of 36.8%,a high crushing strength of 29.3 MPa,a low linear change rate of 0.18%,a thermal conductivity of 0.58 W/(m·K) at 800 ℃ and a refractoriness under load(T_(0.6)) of 1339 ℃.
引文
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[2]魏博.节能型低导热性内衬耐火材料[J].耐火与石灰,2015,40(2):30-32.
[3]Wu D,Wang Y,Gao Z,et al.Insulation performance of heat-resistant material for high-speed aircraft under thermal environments[J].Journal of Materials Engineering&Performance,2015,24(9):3373-3385.
[4]徐维忠.耐火材料[M].北京:冶金工业出版社,1992,1:85-89.
[5]倪文,张春艳.莫来石隔热耐火浇注料的研制[J].矿物岩石,2000,20(1):91-94.
[6]林彬荫.蓝晶石红柱石硅线石[M].北京:冶金工业出版社,2011:88-100.
[7]Saruhan B,Albers W,Schneider H,et al.Reaction and sintering mechanisms of mullite in the systems cristobalite/α-Al2O3,and amorphous Si O2/α-Al2O[J].Journal of the European Ceramic Society,1996,16(10):1075-1081.
[8]李楠,顾华志,赵惠忠.耐火材料学[M].北京:冶金工业出版社,2010:151-154.
[9]张巍.蓝晶石的综合利用进展[J].矿物岩石,2014,34(3):104-120.
[10]王月月,鄢文,李楠,等.蓝晶石含量对含球形莫来石轻骨料的轻质莫来石-刚玉浇注料显微结构与性能的影响[J].耐火材料,2017,51(4):246-249.
[11]Viswabaskaran V,Gnanam F D,Balasubramanian M.Effect of Mg O,Y2O3,and boehmite additives on the sintering behaviour of mullite formed from kaolinite-reactive alumina[J].Journal of Materials Processing Technology,2003,142(1):275-281.
[12]上野和夫,孟祥荣.微观结构对氮化硅陶瓷的断裂韧性及硬度的影响[J].工业陶瓷,1989(3):37-40.
[13]周咏辉,赵军,杨发展,等.Al2O3/(W,Ti)C纳米复合陶瓷材料的显微结构[J].人工晶体学报,2008,37(4):809-813.