Cr_2O_3对尾矿氟金云母微晶玻璃电学性能和切削性能的影响
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摘要
以金尾矿为主要原料,采用传统熔融法制备尾矿氟金云母微晶玻璃。利用DSC、XRD、SEM等检测手段,对尾矿氟金云母微晶玻璃的组织结构、电学性能、加工性能进行研究。实验结果表明:以Cr_2O_3为晶核剂,650℃核化2 h,860℃晶化3 h,可制备主晶相为KMg_3(Si_3AlO_(10))F_2的氟金云母微晶玻璃。随着Cr_2O_3含量增加,其晶体交错程度增大,径厚比达73。常温下,尾矿微晶玻璃体积电阻率达10~(12)Ω·m,而温度达到600℃时,尾矿微晶玻璃体积电阻率为10~6Ω·m;常温100 kHz时,尾矿微晶玻璃的介电常数为8.79～9.64,介电损耗为10~(-3)。随着Cr_2O_3含量增加,材料硬度逐渐下降后达到稳定,材料切削性能先增强,之后趋于稳定,基于材料硬度计算所得的切削性大于0.032。
Tailing fluorphlogopite(KMg3(Si3Al O10)F2)glass-ceramics were prepared by traditional melting method with gold tailing as main raw material.The microstructure,electrical properties and mechanical properties of the as-prepared glass-ceramics were investigated by DSC,XRD and SEM.The results revealed that the fuorophlogopite glass-ceramics with main crystalline phase of KMg_3(Si_3Al O_(10))F_2were prepared after nucleation at 650℃for 2 h and crystallization at 860℃for 3 h.With the increment of Cr_2O_3content,the degree of crystal interlacing in the glassceramics improved and the aspect ratio reached 73.The tailings fluorophlogopite glass-ceramics exhibited the volume resistivity of 10~(12)Ω·m and10~6Ω·m at room temperature and at 600℃,respectively.Under the condition of room temperature and 100 kHz,the dielectric constant of tailings fluorophlogopite glass-ceramics varied in the range of 8.79—9.64 and the dielectric loss was 10~(-3).With the increment of Cr_2O_3content,the hardness of the glass-ceramics dropped gradually and then maintained stable,while the mechanical properties of the glass-ceramics strengthened at first and then stayed almost unchanged.The mechanical properties calculated on the basis of hardness was more than 0.032.
Tailing fluorphlogopite(KMg3(Si3Al O10)F2)glass-ceramics were prepared by traditional melting method with gold tailing as main raw material.The microstructure,electrical properties and mechanical properties of the as-prepared glass-ceramics were investigated by DSC,XRD and SEM.The results revealed that the fuorophlogopite glass-ceramics with main crystalline phase of KMg_3(Si_3Al O_(10))F_2were prepared after nucleation at 650℃for 2 h and crystallization at 860℃for 3 h.With the increment of Cr_2O_3content,the degree of crystal interlacing in the glassceramics improved and the aspect ratio reached 73.The tailings fluorophlogopite glass-ceramics exhibited the volume resistivity of 10~(12)Ω·m and10~6Ω·m at room temperature and at 600℃,respectively.Under the condition of room temperature and 100 kHz,the dielectric constant of tailings fluorophlogopite glass-ceramics varied in the range of 8.79—9.64 and the dielectric loss was 10~(-3).With the increment of Cr_2O_3content,the hardness of the glass-ceramics dropped gradually and then maintained stable,while the mechanical properties of the glass-ceramics strengthened at first and then stayed almost unchanged.The mechanical properties calculated on the basis of hardness was more than 0.032.
引文
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2 Garai M, Sasmal N, Molla A R, et al. Journal of Materials Science,2014,49(4),1612.
3 Yekta B E, Hasheminia S, Alizadeh P. British Ceramic Transactions,2013,103(5),235.
4 Garai M, Karmakar B.Journal of Alloys & Compounds,2016,678,360.
5 Holand W, Beall G H. Glass Ceramic Technology, John Wiley & Sons, US,2012.
6 Tian Q B, Wang Y, Feng L M. Materials Science & Technology,2004,12(3),294(in Chinese).田清波, 王玥, 冯立明. 材料科学与工艺,2004,12(3),294.
7 Taruta S, Hayashi T, Kitajima K.Journal of the European Ceramic Society,2004,24(10),3149.
8 Desimmie B A, Schrijvers R, Debyser Z, et al.Journal of Materials Science Materials in Medicine,2009,20(1),51.
9 Roy S, Basu B. Journal of Materials Science Materials in Medicine,2010,21(1),109.
10 Zhu P N. Glass & Enamel,1989(6),1(in Chinese).诸培南. 玻璃与搪瓷,1989(6),1.
11 Chyung C K, Beall G H, Grossman D G.In:Proceedings of 5th International Materials Symposium, Berkeley,1971.
12 Baik D S, No K S, Chun J S, et al.Journal of Materials Processing Technology,1997,67(1-3),50.
13 Zhang W Y, Gao H. Fluorosilicate glass-ceramics microstructure preparation and properties, Chemical Industry Press, China,2011(in Chinese).章为夷, 高宏. 氟硅酸盐玻璃陶瓷: 组织、制备和性能, 化学工业出版社,2011.
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15 Yuan C X,Tian Z K,Liu Q. Metallic Ore Dressing Abroad,1996,33(4),42(in Chinese).袁楚雄, 田中凯, 刘奇.国外金属矿选矿,1996,33(4),42.