DOI: 10.3724/SP.J.1077.2014.13521

Journal of Inorganic Materials (无机材料学报) 2014/29:7 PP.695-700

Effect of SiC Content on B4C-SiC Composites Fabricated by Mechanical Alloying-Hot Pressing

Dense B4C-SiC composite ceramics were fabricated through mechanical alloying using coarser B4C and SiC powders as starting powders, and subsequent hot pressing sintering at 1950℃ without any sintering aid. The influences of the content of SiC on mechanical properties of the composite ceramics were studied through determing relative density of composite ceramics relative density, Vickers hardness, flexure strength and fracture toughness. Combined with the microstructure and component analysis technologies of XRD, SEM and TEM, the relationship between microstructure and mechanical properties of the composite ceramics was investigated. The results indicate that the and fracture toughness of the composite ceramics are improved with increase of SiC content, and reach the maximum value at 96.1% and 4.6 MPa·m1/2, respectively, with SiC content of 50wt%. However, with the increase of SiC, the Vickers hardness and flexure strength are enhanced firstly and then decreased. The maximum value are 25.5 GPa and 480 MPa, respectively, with SiC content of 20wt%. Homogeneous dispersion of SiC phase in B4C matrix is one of the reasons why the composite ceramics possess higher flexure strength. Fracture toughness of the composite ceramics is significantly higher than that of monomeric B4C. The main reasons are attributed to powerful interfacial bonding between B4C and SiC as well as the higher fracture toughness of SiC.

Key words:composite ceramics,hot pressing,mechanical alloying,mechanical properties,microstructure

ReleaseDate:2016-07-11 11:25:01

[1] SURI A K, SUBRAMANIAN C, SONBER J K, et al. Synthesis and consolidation of boron carbide: a review. International Materials Reviews, 2010, 55(1): 4-40.

[2] DOMNICH V, REYNAUD S, HABER R A, et al. Boron carbide: structure, properties, and stability under stress. Journal of the American Ceramic Society, 2011, 94(11): 3605-3628.

[3] LI AI-JU, ZHEN YU-HUA, ZHANG JI-MING, et al. Microstructures and properties of (SiC,TiB2)/B4C composites. Journal of the Chinese Society, 2006, 34(1): 11-15.

[4] ZORZI J E, PEROTTONI C A, JORNADA DA J A H. Hardness and wear resistance of B4C ceramics prepared with several additives. Materials Letters, 2005, 59(23): 2932-2935.

[5] MASHHADI M, TAHERI-NASSAJ E, SGLAVO V M, et al. Effect of Al addition on pressureless sintering of B4C. Ceramics International, 2009, 35(2): 831-837.

[6] ROCHA DA R M, MELO DE F C L. Sintering of B4C by pressureless liquid phase sintering. Materials Science Forum, 2010, 660-661(10): 170-175.

[7] DU XIAN-WU, ZHANG ZHI-XIAO, WANG WEI-MIN, et al. Effect of particle size on densification and mechanical properties of hot-pressed boron carbide. Journal of Inorganic Materials, 2013, 28(10): 1062-1066.

[8] KIM H W, KOH Y H, KIM H E. Densification and mechanical properties of B4C with Al2O3 as a sintering aid. Journal of the American Ceramic Society, 2000, 83(11): 2863-2865.

[9] MASHHADI M, TAHERI-NASSAJ E, MASHHADI M, et al. Pressureless sintering of B4C-TiB2 composites with Al additions. Ceramics International, 2011, 37(8): 3229-3235.

[10] MA QIAN-CHENG, ZHANG GUO-JUN, KAN YAN-MEI, et al. Densification and mechanical properties of boron carbide ceramics with addition of silicon hexaboride. Journal of Inorganic Materials, 2008, 23 (6): 1175-1178.

[11] SIGL L S. Processing and mechanical properties of boron carbide sintered with TiC. Journal of the European Ceramic Society, 1998,18(11): 1521-1529.

[12] ZHANG Z, DU X, WANG W, et al. Preparation of B4C-SiC composite ceramics through hot pressing assisted by mechanical alloying. International Journal of Refractory Metals and Hard Materials, 2013,41(11): 270-275.

[13] OHYANAGI M, YAMAMOTO T, KITAURA H, et al. Consolidation of nanostructured SiC with disorder-order transformation. Scripta Materialia, 2004,50(1): 111-114.

[14] ZHANG YAN-FENG, WANG LIAN-JUN, JIANG WAN, et al. Combination of high-energy ball milling and spark plasma sintering (SPS). Journal of Inorganic Materials, 2005, 20(6): 1445-1449.

[15] KODERA Y, TOYOFUKU N, YAMASAKI H, et al. Consolidation of SiC/BN composite through MA-SPS method. Journal of Materials Science, 2008, 43(19): 6422-6428.

[16] HAYUN S, WEIZMANN A, DARIEL M P, et al. Microstructural evolution during the infiltration of boron carbide with molten silicon. Journal of the European Ceramic Society, 2010, 30(4): 1007-1014.

[17] SHI XIAO-LEI, ZHANG GONG, TAN YI, et al. Preparation and properties of B4C-SiC composite ceramics. Materials for Mechanical Engineering, 2009, 33(12): 77-80.

[18] ZHANG ZHI-XIAO, DU XIAN-WU, WANG WEI-MIN, et al. Preparation and sintering of high activity B4C-SiC ultrafine composite powders. Journal of Inorganic Materials, 2014, 29(2): 185-190.

[19] SURYANARAYANA C, AL-AQEELI N. Mechanically alloyed nanocomposites. Progress in Materials Science, 2013, 58(4): 383-502.

[20] YIN BANG-YUE, WANG LING-SEN, FANG YAN-CHU. Preparation and sintering of ultrafine B4C powders. Journal of Inorganic Materials, 2002,17(2): 343-348.

[21] DAVIDGE R W. Mechanical Behaviour of Ceramics. Cambridge: Cambridge University Press, 1979.

[22] 谢志鹏. 结构陶瓷. 北京: 清华大学出版社, 2011: 486-492.

[23] MOSHTAGHIOUN B M, ORTIZ A L, GóMEZ-GARCíA D, et al. Toughening of super-hard ultra-fine grained B4C densified by spark-plasma sintering via SiC addition. Journal of the European Ceramic Society, 2013, 33(8): 1395-1401.