c-BN对于SPS烧结Si_3N_4/BN复相陶瓷结构和性能的影响
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摘要
本研究通过引入立方氮化硼(c-BN),采用放电等离子烧结(SPS)制备Si_3N_4/BN复合材料,研究了c-BN在高温下的相变对Si_3N_4/BN复合材料烧结、结构和力学性能的影响。结果表明:在高温下c-BN发生物相转变原位生成的hBN能够均匀分散在Si_3N_4基体中,对于Si_3N_4/BN复合材料的烧结有明显的促进作用,同时对于Si_3N_4物相转变和晶粒生长的抑制作用小于直接引入到基体中的h-BN。对材料力学性能的分析显示:相较于直接引入h-BN,添加c-BN的复合材料硬度有轻微地下降,而抗弯强度和断裂韧性同时有了明显地提升。
Si_3N_4/BN composites were prepared by spark plasma sintering( SPS) with cubic boron nitride( c-BN). The effect of phase transformation of c-BN at high temperature on sintering,microstructure and mechanical properties of Si_3N_4/BN composites was studied. The results show that the in-situ h-BN formed by phase transformation of c-BN can be uniformly dispersed in the Si_3N_4 matrix at high temperature,which can obviously promote the sintering of Si_3N_4/BN composites,and the inhibition of phase transformation and growth of Si_3N_4 grains was less than that of h-BN directly introduced into the matrix. The mechanical properties of the composites show that the hardness of composites with c-BN was slightly decreased,while the flexural strength and fracture toughness were obviously improved compared with that of the composites with h-BN.
Si_3N_4/BN composites were prepared by spark plasma sintering( SPS) with cubic boron nitride( c-BN). The effect of phase transformation of c-BN at high temperature on sintering,microstructure and mechanical properties of Si_3N_4/BN composites was studied. The results show that the in-situ h-BN formed by phase transformation of c-BN can be uniformly dispersed in the Si_3N_4 matrix at high temperature,which can obviously promote the sintering of Si_3N_4/BN composites,and the inhibition of phase transformation and growth of Si_3N_4 grains was less than that of h-BN directly introduced into the matrix. The mechanical properties of the composites show that the hardness of composites with c-BN was slightly decreased,while the flexural strength and fracture toughness were obviously improved compared with that of the composites with h-BN.
引文
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[3] Wei D Q,Meng Q C,Jia D C. Mechanical and Tribological Properties of Hot-pressed h-BN/Si3N4Ceramic Composites[J]. Ceramics International,2006,32:549-554.
[4] Wang S J,Jia D C,Yang Z H,et al. Effect of BN Content on Microstructures,Mechanical and Dielectric Properties of Porous BN/Si3N4Composite Ceramics Prepared by Gel Casting[J]. Ceramics International,2013,39(4):4231-4237.
[5] Liu J X,Zhang G J,Kan Y M,et al. Properties of Porous Si3N4/BN Composites Fabricated by RBSN Technique[J]. International Journal of Applied Ceramic Technology,2010,7(4):536-545.
[6] Zhong B,Zhao G L,Huang X X,et al. Microstructure and Mechanical Properties of ZTA/BN Machinable Ceramics Fabricated by Reactive Hot Pressing[J]. Journal of the European Ceramic Society,2015,35(2):641-649.
[7] Li X Q,Gao Y M,Wu P,et al. Fabrication and Characterization of B4C-based Ceramic Composites with Different Mass Fractions of Hexagonal Boron Nitride[J]. Ceramics International,2015,41(1):27-36.
[8] Gao L,Jin X H,Li J G,et al. BN/Si3N4Nanocomposite with High Strength and Good Machinability[J]. Materials Science and Engineering A,2006,415(1):145-148.
[9] Li Y L,Li R X,Zhang J X. Enhanced Mechanical Properties of Machinable Si3N4/BN Composites by Spark Plasma Sintering[J]. Materials Science and Engineering A,2008,483:207-210.
[10] Hwang C J,Newman R A. Silicon Nitride Ceramics with Celsian as an Additive[J]. Journal of Materials Science,1996,31(1):150-156.
[11] Pyzik A J,Carroll D F. Technology of Self-reinforced Silicon Nitride[J]. Annual Review of Materials Research,1994,24(1):189-214.
[12] Lai K R,Tien T Y. Kinetics ofβ-Si3N4Grain Growth in Si3N4Ceramics Sintered under High Nitrogen Pressure[J]. Journal of the American Ceramic Society,1993,76(1):91-96.
[13] Nygren M,Shen Z J. On the Preparation of Bio-,Nano-and Structural Ceramics and Composites by Spark Plasma Sintering[J]. Solid State Sciences,2003,5(1):125-131.
[14] Krstic Z,Yu Z B,Krstic V D. Effect of Grain Width and Aspect Ratio on Mechanical Properties of Si3N4ceramics[J]. Journal of Materials Science,2007,42(14):5431-5436.
[15] Becher P F,Sun E Y,Plucknett K P,et al. Microstructural Design of Silicon Nitride with Improved Fracture Toughness:I,Effects of Grain Shape and Size[J]. Journal of the American Ceramic Society,2010,81(11):2821-2830.
[16] Peillon F C,Thevenot F. Microstructural Designing of Silicon Nitride Related to Toughness[J]. Journal of the European Ceramic Society,2002,22(3):271-278.
[17] KovalcíkováA,Balko J,Balázsi C,et al. Influence of hBN Content on Mechanical and Tribological Properties of Si3N4/BN Ceramic Composites[J]. Journal of the European Ceramic Society,2014,34(14):3319-3328.