MgO含量与颗粒度对Si_3N_4-Y_2O_3-MgO陶瓷液相烧结行为及力学性能的影响
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摘要
本文基于Si_3N_4-Y_2O_3-MgO液相烧结体系,系统研究了MgO含量和颗粒度对材料致密度、物相组成、显微结构以及力学性能的影响效果与作用机制。结果显示,MgO含量的增加,会使得液相组分增多,进而提高材料的致密度,同时促进β-Si_3N_4晶粒的粗化生长;当液相含量相同但MgO颗粒度增大时,材料致密度和β-Si_3N_4晶粒长径比会同时出现降低趋势。这表明,液相组分MgO的颗粒度会直接影响液相的形成与分布,进而对润湿、颗粒重排及传质过程产生作用。当MgO含量与颗粒度分别为4%和0. 1μm时,材料相对密度、断裂韧性和维氏硬度获得最佳值,分别为99. 5%±0. 2%,(6. 9±0. 6) MPa·m~(1/2),(18. 7±0. 1) GPa。
The effects of MgO content and particle size on the density,phase composition,microstructure and mechanical properties of Si_3N_4-Y_2O_3-MgO liquid phase sintering system were investigated systematically in the present work. Results show that the effect of liquid phase could be more important due to the increase of MgO content,thus resulting in enhancing the final density of material and promoting the coarsening growth of β-Si_3N_4 grains. When the liquid phase content was the same but MgO particle size increased,the final density and aspect ratio of β-Si_3N_4 grains simultaneously tended to diminish. It is found that the MgO particle size has significant influence on the formation and distribution of liquid phase,hence affects the wettability,particle rearrangement and mass transfer during liquid phase sintering process. The relative density,fracture toughness and Vickers hardness reached maximum values of 99. 5% ± 0. 2%,( 6. 9 ± 0. 6) MPa · m~(1/2) and( 18. 7 ± 0. 1) GPa,respectively at a MgO adding level of 4 wt% and a particle size of 0. 1 μm.
The effects of MgO content and particle size on the density,phase composition,microstructure and mechanical properties of Si_3N_4-Y_2O_3-MgO liquid phase sintering system were investigated systematically in the present work. Results show that the effect of liquid phase could be more important due to the increase of MgO content,thus resulting in enhancing the final density of material and promoting the coarsening growth of β-Si_3N_4 grains. When the liquid phase content was the same but MgO particle size increased,the final density and aspect ratio of β-Si_3N_4 grains simultaneously tended to diminish. It is found that the MgO particle size has significant influence on the formation and distribution of liquid phase,hence affects the wettability,particle rearrangement and mass transfer during liquid phase sintering process. The relative density,fracture toughness and Vickers hardness reached maximum values of 99. 5% ± 0. 2%,( 6. 9 ± 0. 6) MPa · m~(1/2) and( 18. 7 ± 0. 1) GPa,respectively at a MgO adding level of 4 wt% and a particle size of 0. 1 μm.
引文
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[13]Yang H,Gao L,Yuan R Z.Effect of Mg O/CeO2On Pressureless Sintering of Silicon Nitride[J].Materials Chemistry and Physics,2001,69:281-283.
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[15]Shen Z J,Zhao Z,Peng H,et al.Formation of Tough Interlocking Microstructures in Silicon Nitride Ceramics by Dynamic Ripening[J].Nature,2002:417.
[2]Bal B S,Rahaman M N.Orthopedic Applications of Silicon Nitride Ceramics[J].Acta Biomater,2012,8(8):2889-2898.
[3]Danzer R,Lengauer M.Silicon Nitride Materials for Hot Working of High Strength Metal Wires[J].Eng.Fail.Anal.,2010,17(3):596-606.
[4]Wang L,Snidle R W,Gu L,Rolling Contact Silicon Nitride Bearing Technology:A Review of Recent Research[J].Wear,2000,246(1-2):159-73.
[5]师瑞霞,尹衍升,王英姿.烧结助剂对氮化硅陶瓷显微结构和性能的影响[J].现代技术陶瓷,2003,3:7-10.
[6]邹强,徐廷献,郭文利,等.Si3N4陶瓷烧结中烧结助剂的研究进展[J].硅酸盐通报,2004,23(1):81-84.
[7]Becher P F,Painter G S,Shibata N.Effects of Rare-Earth(RE)Intergranular Adsorption on the Phase Transformation,Microstructure Evolution,and Mechanical Properties in Silicon Nitride with RE2O3-Mg O Additives:RE=La,Gd,and Lu[J].Am.Ceram.Soc.,2008,91(7):2328-2336.
[8]毛豫兰,杨海涛,赵雷康.氮化硅-氧化镁-氧化钇陶瓷的常压烧结[J].武汉理工大学学报,2006,28(6):17-19.
[9]杜大明,李养良,李永志.放电等离子烧结Si3N4陶瓷[J].佛山陶瓷,2005,6:7-10.
[10]Yang H,Yang G,Yuan R.Pressureless Sintering of Silicon Nitride With Magnesia and Ceria[J].Materials Research Bulletin,1998,33(10):1467-1473.
[11]王欢,玄伟东,杨治刚,等.氮化硅陶瓷的无压烧结工艺优化及性能研究[J].硅酸盐通报,2016,35(9):2747-2752.
[12]Wasanapiarnpong T,Wada S,Imai M.Effect of Post-Sintering Heat-Treatment on Thermal and Mechanical Properties of Si3N4Ceramics Sintered with Different Additives[J].Journal of the European Ceramic Society,2006,26:3467-3475.
[13]Yang H,Gao L,Yuan R Z.Effect of Mg O/CeO2On Pressureless Sintering of Silicon Nitride[J].Materials Chemistry and Physics,2001,69:281-283.
[14]Zuo F,Meng F,Lin D T,et al.Effect of Current Pattern and Conductive Phase on Sintering Behavior of Si3N4-Based Ceramic Composite[J].Ceramics International,2018,44(8):9561-9567.
[15]Shen Z J,Zhao Z,Peng H,et al.Formation of Tough Interlocking Microstructures in Silicon Nitride Ceramics by Dynamic Ripening[J].Nature,2002:417.