烧结助剂添加方式对AlN陶瓷力学性能的影响
Effect of Adding Method of Sintering Additive on Mechanical Properties of AlN Ceramics
摘 要
通过直接添加与原位生成两种方式引入Y2O3作为烧结助剂, 热压烧结制备了AlN陶瓷; 研究了添加方式及添加量对AlN陶瓷显微结构和力学性能的影响。结果表明: 原位生成烧结助剂的方式更有利于AlN陶瓷的致密化, 特别是当原位生成的Y2O3质量分数为2%时, AlN陶瓷的相对密度达到99.0%, 硬度为15.39 GPa, 抗弯强度为383.0 MPa, 均高于直接添加Y2O3的; 同时可获得晶形完整、第二相含量少且大部分位于三叉晶界、晶粒间面-面接触的显微结构; 随着原位生成烧结助剂添加量的增多, 陶瓷的相对密度下降, 在AlN晶界处出现大量第二相而导致陶瓷的硬度、抗弯强度等力学性能也下降。
原位生成
烧结助剂
力学性能
AlN ceramic
in-situ formation
sintering additive
mechanical property
Abstract
AlN ceramics were fabricated by hot-pressing with Y2O3 as sintering additive added by direct addition and in-situ formation. The effects of adding method and amount of sintering additive on microstructure and mechanical properties of AlN ceramics were investigated. The results show that the sintering additive added by in-situ formation was more beneficial to densification of AlN ceramics, and particularly, when Y2O3 was added by in-situ formation and reached 2wt%, the relative density, hardness and flexural strength could reach up to 990%, 15.39 GPa and 383.0 MPa, respectively, higher than those when Y2O3 was added directly. At the same time an integrated-shaped microstructure with low content of secondary phase, which mainly distributed at trigeminal grain boundaries, and with surface contact between grains was generated. However, with the increase of adding amount of the sintering additive added by in-situ formation, the relative density, hardness and flexural strength of AlN ceramics decreased due to the large amount of secondary phase at grain boundaries.
中图分类号 TB321 TQ174
所属栏目
基金项目 国家自然科学基金资助项目(50871025); 辽宁省自然科学基金资助项目(20051075)
收稿日期 2010/5/14
修改稿日期 2011/5/13
网络出版日期
作者单位点击查看
备注许富民(1969-), 男, 辽宁大连人, 副教授。
引用该论文: XU Fu-min,LI Jia-yan,ZHANG Zhi-jun,SHI Xiao-lei,LI Xiao-na,TAN Yi. Effect of Adding Method of Sintering Additive on Mechanical Properties of AlN Ceramics[J]. Materials for mechancial engineering, 2011, 35(7): 50～53
许富民,李佳艳,张志军,石小磊,李晓娜,谭毅. 烧结助剂添加方式对AlN陶瓷力学性能的影响[J]. 机械工程材料, 2011, 35(7): 50～53
被引情况:
【1】李发亮,孟录,张海军,张少伟, "Ca-α/β-Sialon结合刚玉复合材料的力学性能",机械工程材料 39, 73-76(2015)
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参考文献
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【17】TENG X Y, LIU H L, HUANG C Z. Effect of Al2O3 particle size on the mechanical properties of alumina-based cera-mics[J].Materials Science and Engineering A, 2007, 452/453: 545-551.
【2】HIROYA A, KAZUYOSHI S, MAKIO N, et al. Effects of granule compaction procedures on defect structure, fracture strength and thermal conductivity of AlN ceramics[J].Powder Technology, 2005, 159(3): 155-160.
【3】CHEN G H, LIU X Y. Influence of AlN addition on thermal and mechanical properties of cordierite-based glass/ceramic composites[J].Journal of Material Processing Technology, 2007, 190(1/3): 77-80.
【4】仝世红, 卢铁城, 郭旺, 等.改性的沉淀法制备三氧化二钇粉体[J].功能材料, 2005, 36(9): 1418-1420.
【5】VIRKAR A V, JACKSON T B, CUTLER R A. Thermodynamic and kinetic effects of oxygen removal on the thermal conductivity of aluminum nitride[J].Journal of the American Ceramic Society, 1989, 72(11): 2031-2042.
【6】HASHIMOTO N, YODEN H, DEKI S. Sintering behavior of fine aluminum nitride powder synthesized from aluminum polynuclear complexes[J].Journal of the American Ceramic Society, 1992, 75(8): 2098-2106.
【7】JACKSON T B, VIRKAR A V, MORE K L, et al. High-thermal-conductivity aluminium nitride ceramics: The effect of thermodynamic, kinetic, and microstructural factors[J].Journal of the American Ceramic Society, 1997, 80(6): 1421-1435.
【8】WATARI K, TSUZUKI A, TORII Y. Effect of rare-earth oxide addition on the thermal conductivity of sintered aluminum nitride[J].Journal of Materials Science Letter, 1992, 11(22): 1508-1510.
【9】BUHR H, MVLLER G. Microstructure and thermal conductivity of AlN(Y2O3) ceramics sintered in different atmospheres[J].Journal of the European Ceramic Society, 1993, 12(4): 271-277.
【10】WATARI K, ISHIZAKI K, TSUCHIYA F. Phonon sca-ttering and thermal conduction mechanisms of sintered alumi-nium nitride ceramics[J].Journal of Materials Science, 1993, 28(14): 3709-3714.
【11】周和平, 周劲松.添加CaF2-Y2O3的AlN陶瓷的显微结构及热导性质[J].无机材料学报, 1995, 10(4): 439-444.
【12】YU Y D, HUNDERE A M, HOIER R, et al. Microstruc-tural characterization and microstructural effects on the thermal conductivity of AlN(Y2O3) ceramics[J].Journal of the European Ceramic Society, 2002, 22(2): 247-252.
【13】YAO Y J, QIU T. Effects of behaviors of aluminum nitride ceramics with rare earth oxide additives[J].Journal of Rare Earths, 2007, 25(1): 58-63.
【14】JIN H Y, WANG W, GAO J Q, et al. Study of machinable AlN/BN ceramic composites[J].Materials Letters, 2006, 60(2): 190-193.
【15】PETCH N J. The cleavage strength of polycrystals[J].Journal of the Iron Steel Institute, 1953, 174: 25-28.
【16】LI W Q, GAO L. Processing, microstructure and mechanical properties of 25 vol% YAG-Al2O3 nanocomposites[J].NanoStructured Materials, 1999, 11(8): 1073-1080.
【17】TENG X Y, LIU H L, HUANG C Z. Effect of Al2O3 particle size on the mechanical properties of alumina-based cera-mics[J].Materials Science and Engineering A, 2007, 452/453: 545-551.
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