李文虎,周佩德,艾桃桃,张良,冯小明

• 1:陕西理工大学材料科学与工程学院

摘要(Abstract)：

采用真空热压烧结工艺制备了不同La_2O_3含量(0,0.3,0.6,0.9,1.2 mass%)的Mo_2NiB_2金属陶瓷材料,用电子万能材料试验机测定材料的弯曲强度与断裂韧性,用X射线衍射仪(XRD)、扫描电镜(SEM)观察分析材料的物相和组织结构。结果表明:随着La_2O_3含量的增加,Mo_2NiB_2金属陶瓷断裂韧性逐渐下降,当La_2O_3含量为0.6 mass%时,其弯曲强度值达到最大,为1050.36 MPa;Mo_2NiB_2金属陶瓷断裂的断裂方式表现为:Mo_2NiB_2相呈现脆性解理断裂,Ni基固溶体相主要为韧窝延性断裂。

关键词(KeyWords)： Mo_2NiB_2金属陶瓷;微观组织;断裂韧性;弯曲强度

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(51602186)

作者(Author): 李文虎,周佩德,艾桃桃,张良,冯小明

DOI: 10.13289/j.issn.1009-6264.2018-0543

参考文献(References)：

• [1] Touzani R S,Rehorn C W G,Fokwa B P T.Influence of chemical bonding and magnetism on elastic properties of the A2MB2 borides (A=Nb,Ta;M=Fe,Ru,Os) from first-principles calculations[J].Computational Materials Science,2015,104:52-59.
• [2] Yu H Z,Liu W J,Zheng Y.Effect of carbon content on the microstructure and mechanical properties of Mo2FeB2 based cermets[J].Refractory Metals and Hard Materials,2011,29(6):724-728.
• [3] Yamasaki Y,Nishi M,Takagi K I.Development of very high strength Mo2NiB2 complex[J].Journal of Solid State Chemistry,2004,177:551-555.
• [4] Karak?se E,Keskin M.Effect of microstructural evolution and elevated temperature on the mechanical properties of Ni-Cr-Mo alloys[J].Journal of Alloys and Compounds,2015,619:82-90.
• [5] 张国军,邹冀,倪德伟,等.硼化物陶瓷:烧结致密化、微结构调控与性能提升[J].无机材料学报,2012,27(3):225-233.ZHANG Guo-jun,ZOU Ji,NI De-wei,et al.Boride ceramics:Densification,microstructure tailoring and properties improvement[J].Journal of Inorganic Materials,2012,27(3):225-233.
• [6] Yuan B,Zhang G J,Kan Y M,et al.Reactive synthesis and mechanical properties of Mo2NiB2 based hard alloy[J].International Journal of Refractory Metals and Hard Materials,2010,28:291-296.
• [7] 易善杰,尹海清,殷小龙,等.Mo2NiB2基金属陶瓷的制备与性能[J].工程科学学报,2015,37(4):488-493.YI Shan-jie,YIN Hai-qing,YIN Xiao-long,et al.Preparation and properties of Mo2NiB2 based cermets[J].Chinese Journal of Engineering,2015,37(4):488-493.
• [8] Takagi K I,Koike W,Momozawa A,et al.Effects of Cr on the properties of Mo2NiB2 ternary boride[J].Solid State Sciences,2012,14:1643-1647.
• [9] Takagi K I.Development and application of high strength ternary boride base cermets[J].Journal of Solid State Chemistry,2006(179):2809-2818.
• [10] Takagi K I,Yamasaki Y.Effects of Mo/B atomic ratio on the mechanical properties and structure of Mo2NiB2 boride base cermets with Cr and V additions[J].Journal of Solid State Chemistry,2000(154):263-268.
• [11] Mukhopadhyay A.Relationship between microstructure and abrasive wear resistance of Al2O3-FeAl2O4 nano-composites produced via solid-state precipitation[J].Eur Ceram Soc,2011,31:339-350.
• [12] Matti K,Sil A.Microstructural relationship with fracture toughness of undoped and rare earths (Y,La) doped Al2O3-ZrO2 ceramic composites[J].Ceramics International,2011,37(7):2411-21.
• [13] Kubliy V Z,Bondar A A,Utkin S V,et al.Phase equilibria in the nickel corner of the Mo-Ni-B system at temperatures close to melting[J].Powder Metallurgy and Metal Ceramics,2008,47(3/4):211-222
• [14] Morishita M,Koyama K,Yagi S.Calculated phase diagram of the Ni-Mo-B ternary system[J].Journal of Alloys and Compounds,2001,314:212-218.
• [15] 胡肇炜,李文戈,吴钱林.激光熔覆原位合成 Mo2NiB2的热力学分析及数值模拟[J].材料热处理学报,2017,38(5):166-171.HU Zhao-wei,LI Wen-ge,WU Qian-lin.Thermodynamic analysis and numerical simulation of Mo2NiB2 prepared in-situ by laser cladding[J].Transactions of Materials and Heat Treatment,2017,38(5):166-171.
• [16] 马秀良,胡肖兵.高温合金中硼化物精细结构的高空间分辨电子显微学研究[J].金属学报,2018,54(11):1503-1524.MA Xiu-liang,HU Xiao-bing.High-resolution transmission electron microscopic study of various borides precipitated in superalloys[J].Acta Metallurgica Sinica,2018,54(11):1503-1524.

文章评论(Comment)：