以 Ti、TiC、Al 和 TiO 2为原料,通过原位热压反应烧结法在1350℃合成 Ti2 AlC/Al2 O 3复合材料.利用 XRD 详细研究了其反应过程,并分析了Al2 O 3对材料微观结构和性能的影响.结果表明,该体系在热压过程中的反应分多步进行,主要包括 Ti 粉与 Al 粉反应生成 Ti-Al 金属间化合物,TiO 2与 Al 反应生成 Al2 O 3以及 Ti-Al 金属间化合物与 TiC 反应生成 Ti2 AlC 材料.原位反应生成的 Al2 O 3均匀分布在Ti2 AlC 晶界上,抑制了 Ti2 A1C 晶体的异常生长,从而使基体相 Ti2 AlC 晶粒细小、均匀.力学性能测试表明 Ti2 AlC/12％(质量分数)Al2 O 3复合材料的硬度、抗压强度、抗弯强度和断裂韧性较 Ti2 AlC 单相材料分别提高了66％,126％,130％和19．3％,并分析了其改性机理.
Ti2 AlC/12wt% Al2 O 3 composite was successfully synthesized from the powder mixture of Ti,TiC, Al and TiO 2 by in situ hot-pressing method at 1 300 ℃.The reaction path and the effect of Al2 O 3 addition on the microstructure and mechanical properties of the Ti2 AlC/12wt% Al2 O 3 composite were investigated in detail. It was found that the reactions of powder mixture during the hot press sintering contain several intermediate phases,including the formation of Ti-Al intermetallics from Ti and Al,reducing TiO 2 by Al to form Al2 O 3 , and reacting of TiAl intermetallics with TiC to form Ti2 AlC.Meanwhile,the in situ formed Al2 O 3 inhibits the abnormal growth of Ti2 AlC,and makes the microstrcture possess fine grains with a uniform dispersion.The Rockwell hardness,compressive,flexural strength and fracture toughness of the Ti2 AlC/12wt% Al2 O 3 com-posite are increased by 66%,126%,130%,1 9.3%,compared to the monolithic Ti2 AlC.
参考文献
| [1] | Michel W.Barsoum .The M_(N+1)AX_N Phases: A new Class of solids; Thermodynamically Stable Nanolaminates[J].Progress in Solid State Chemistry,2000(1/4):201-281. |
| [2] | Barsoum M W;Brodkin D T;EL-Raghy T .Processing and characterization of Ti2 AlC,Ti2 AlN and Ti2 AlC0.5 N0.5[J].Metallurgical and Materials Transactions A:Physical Metallurgy and Materials Science,2000,31A(07):1857-1865. |
| [3] | Wang X H;Zhou Y C .Solid-liquid reaction synthesis and simultaneous densification of polycrystalline Ti2 AlC[J].ZEITSCHRIFT FUR METALLKUNDE,2002,93(01):66-71. |
| [4] | Z. J. Lin;M. J. Zhuo;Y. C. Zhuo .Microstructural characterization of layered ternary Ti_2AlC[J].Acta materialia,2006(4):1009-1015. |
| [5] | X.H. Wang,Y.C. Zhou.Layered Machinable and Electrically Conductive Ti2AlC and Ti3AlC2 Ceramics: a Review[J].材料科学技术学报（英文版）,2010(05):385-416. |
| [6] | Michel W. Barsoum;Dmitri Brodkin;Tamer El-Raghy .Layered machinable ceramics for high temperature applications[J].Scripta materialia,1997(5):535-541. |
| [7] | Luo Y M;Li S;Chen J et al.Fabrication of Al2 O 3-Ti3 SiC2 composites and mechanical properties evaluation[J].Journal of the American Ceramic Society,2002,85:3099-3101. |
| [8] | Wang H J;Jin Z H;Miyamoto Y .Effect of Al2 O 3 on mechanical properties of Ti3 SiC2/Al2 O 3 composites[J].CERAMICS INTERNATIONAL,2002,28:931-934. |
| [9] | J. X. Chen;Y. C. Zhou .Strengthening of Ti_3AlC_2 by incorporation of Al_2O_3[J].Scripta materialia,2004(6):897-901. |
| [10] | Chen JX;Zhou YC;Zhang HB;Wan DT;Liu MY .Thermal stability of Ti3AlC2/Al2O3 composites in high vacuum[J].Materials Chemistry and Physics,2007(1):109-112. |
| [11] | Wu Ling;Chen Jixin;Liu Mingyue et al.Reciprocating friction and wear behavior of Ti3 AlC2 and Ti3 AlC2/Al2 O 3 composites against AISI5200 bearing steel[J].WEAR,2009,266:158-166. |
| [12] | 艾桃桃,冯小明.三元Ti3AlC2陶瓷的原位合成与表征[J].硅酸盐通报,2011(02):424-427. |
| [13] | 余晓娟,梅炳初,周卫兵.原位热压合成Ti3AlC2/Al2O3复合材料的研究[J].稀有金属快报,2007(10):30-33. |
| [14] | Jixin CHEN;Jialin LI;Yanchun ZHOU .In-situ Synthesis of Ti_3AlC_2/TiC-Al_2O_3 Composite from TiO_2-Al-C System[J].Journal of Materials Science & Technology,2006(4):455-458. |
| [15] | C.L. Yeh;C.W. Kuo;Y.C. Chu .Formation of Ti_3AlC_2/Al_2O_3 and Ti_2AlC/Al_2O_3 composites by combustion synthesis in Ti-Al-C-TiO_2 systems[J].Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics,2010(1/2):132-136. |
| [16] | V. Gauthier-Branet;T. Cabioc'h;P. Chartier .Reaction synthesis of layered ternary Ti_2AlC ceramic[J].Journal of the European Ceramic Society,2009(1):187-194. |
| [17] | Chen Yan-Lin;Yan Ming;Sun Yi-Ming .The phase transformation and microstructure of TiAl/Ti_2AlC composites caused by hot pressing[J].CERAMICS INTERNATIONAL,2009(5):1807-1812. |
| [18] | WANG Ping;MEI Bing-chu;HONG Xiao-lin;ZHOU Wei-bi .Synthesis of Ti_2AlC by hot pressing and its mechanical and electrical properties[J].Transactions of Nonferrous Metals Society of China,2007(5):1001-1004. |
| [19] | Zhu, J.;Yang, W.;Yang, H.;Wang, F. .Effect of Nb_2O_5 on the microstructure and mechanical properties of TiAl based composites produced by hot pressing[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2011(21):6642-6646. |
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