Gd_2O_3对O’-Sialon/Si_3N_4复相陶瓷结构与性能的影响
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摘要
以α-Si_3N_4粉和黑刚玉为原料、Gd_2O_3为烧结助剂,采用无压烧结工艺制备了O’-Sialon/Si_3N_4复相陶瓷材料,研究了Gd_2O_3添加量和烧结温度对样品性能、相组成和显微结构的影响,探讨了Gd_2O_3对复相陶瓷的作用机理。结果表明:复相陶瓷主晶相为α-Si_3N_4、β-Si_3N_4和O’-Sialon,添加Gd_2O_3一方面可在高温烧结过程中形成液相,促进α-Si_3N_4的"溶解–析出"过程,有利于α-Si_3N_4向β-Si_3N_4的晶型转变以及β-Si_3N_4晶粒的生长;另一方面可促进α-Si_3N_4与Al_2O_3和Si O_2的固溶反应,生成O’-Sialon相,使样品中O’-Sialon含量增加。当Gd_2O_3添加量为6%(质量分数)时,经1 600℃烧结的样品SN-G6性能最佳:气孔率为23.29%;体积密度为2.31 g·cm~(–3);抗折强度达到105.57 MPa。
O’-Sialon/Si_3N_4 composite ceramics were preparated by a pressureless sintering method usingα-Si_3N_4 and black corundum as starting materials,and Gd_2O_3 as a sintering additive.Effects of Gd_2O_3 content and sintering temperature on the physical properties,phase composition and microstructure of samples were investigated.The results reveal that the main phase compositions of sintered samples areα-Si_3N_4,β-Si_3N_4 and O’-Sialon.Adding Gd_2O_3 can promote the formation of liquid phase during sintering,favoring the phase transformation ofα-Si_3N_4 toβ-Si_3N_4 and the growth ofβ-Si_3N_4 grains,as well as promotingα-Si_3N_4 for solid solution reaction with SiO_2 and Al_2O_3 to generate O'-Sialon and increasing the content of O'-Sialon in the sample.Sample SN–G6(Si_3N_4:80%,black corundum:20%,Gd_2O_3 addition:6%)sintered at 1 600℃has the optimum performance(i.e.,apparent porosity of 23.29%,bulk density of 2.31 g·cm~(–3) and bending strength of 105.57 MPa).
O’-Sialon/Si_3N_4 composite ceramics were preparated by a pressureless sintering method usingα-Si_3N_4 and black corundum as starting materials,and Gd_2O_3 as a sintering additive.Effects of Gd_2O_3 content and sintering temperature on the physical properties,phase composition and microstructure of samples were investigated.The results reveal that the main phase compositions of sintered samples areα-Si_3N_4,β-Si_3N_4 and O’-Sialon.Adding Gd_2O_3 can promote the formation of liquid phase during sintering,favoring the phase transformation ofα-Si_3N_4 toβ-Si_3N_4 and the growth ofβ-Si_3N_4 grains,as well as promotingα-Si_3N_4 for solid solution reaction with SiO_2 and Al_2O_3 to generate O'-Sialon and increasing the content of O'-Sialon in the sample.Sample SN–G6(Si_3N_4:80%,black corundum:20%,Gd_2O_3 addition:6%)sintered at 1 600℃has the optimum performance(i.e.,apparent porosity of 23.29%,bulk density of 2.31 g·cm~(–3) and bending strength of 105.57 MPa).
引文
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[2]谢志鹏.结构陶瓷[M].北京:清华大学出版社,2011.
[3]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.WANG Huan,XUAN Weidong,YANG Zhigang,et al.Bull Chin Ceram Soc(in Chinese),2016,35(9):2747-2752.
[4]杨亮亮,谢志鹏,李双.MgO-Al2O3-CeO2复合烧结助剂对放电等离子烧结氮化硅陶瓷致密化和性能的影响[J].硅酸盐学报,2015,43(12):1712-1718.YANG Liangliang,XIE Zhipeng,LI Shuang.J Chin Ceram Soc,2015,43(12):1712-1718.
[5]DEELEY G G,HERBERT J M,MOORE N C.Dense silicon nitride[J].Powder Metall,1961,4(8):145-151.
[6]TATARKO P,LOJANOVá?,DUSZA J,et al.Influence of various rare-earth oxide additives on microstructure and mechanical properties of silicon nitride based nanocomposites[J].Mat Sci Eng A,2010,527(18-19):4771-4778.
[7]GUEDES-SILVA C C,CARVALHO F M D S,BRESSIANI J C.Effect of rare earth oxides on properties of silicon nitride obtained by normal sintering and sinter-HIP[J].J Rare Earths,2012,30(11):1177-1183.
[8]YAMAMOTO H,AKIYAMA K,MURAKAMI Y.Densification behaviors and high-temperature characteristics of Si3N4 sintered bodies using Al2O3-Yb2O3 additives[J].J Eur Ceram Soc,2006,26(6):1059-1067.
[9]LIU T T,JIANG C F,GUO W.Effect of Ce O2 on low temperature pressureless sintering of porous Si3N4 ceramics[J].J Rare Earths,2017,35(2):172-176.
[10]白星亮,乔瑞庆,张翠敏.低温无压烧结氮化硅陶瓷的相变及致密化研究[J].硅酸盐通报,2016,35(9):3053-3056.BAI Xingliang,QIAO Ruiqing,ZHANG Cuimin.Bull Chin Ceram Soc(in Chinese),2016,35(9):3053-3056.
[11]WU J F,ZHANG Y X,XU X H,et al.Thermal shock resistance and oxidation behavior of in-situ synthesized MgAl2O4-Si3N4 composites used for solar heat absorber[J].Ceram Int,2016,42(8):10175-10183.
[12]WU J F,ZHANG Y X,XU X H,et al.Preparation and performance ofβ-Sialon/Si3N4 composite ceramics for solar heat absorber[J].Appl Mech Mater,2014,692:234-239.
[13]黄继武,李周.多晶材料X射线衍射:实验原理、方法与应用[M].冶金工业出版社,2012.
[14]徐晓虹,管晓敏,吴建锋,等.溶胶-凝胶法制备陶瓷喷墨打印用镨锆黄色料[J].硅酸盐学报,2017,45(6):855-862.XU Xiaohong,GUAN Xiaomin,WU Jianfeng,et al.J Chin Ceram Soc,2017,45(6):855-862.
[15]于俊杰,管甲锁,郭伟明,等.基于高SiO2含量的Si3N4基陶瓷显微结构与力学性能[J].硅酸盐学报,2016,44(12):1713-1717.YU Junjie,GUAN Jiasuo,GUO Weiming,et al.J Chin Ceram Soc,2016,44(12):1713-1717.
[16]WU J F,ZHANG Y X,XU X H,et al.A novel in-situβ-Sialon/Si3N4ceramic used for solar heat absorber[J].Ceram Int,2015,41(10):14440-14446.
[17]DUSZA J,MORGIEL J,DUSZOVáA,et al.Microstructure and fracture toughness of Si3N4 graphene platelet composites[J].J Eur Ceram Soc,2012,32(12):3389-3397.
[18]LOJANOVáS,TATARKO P,CHLUP Z,et al.Rare-earth element doped Si3N4/SiC micro/nano-composites-RT and HT mechanical properties[J].J Eur Ceram Soc,2010,30(9):1931-1944.
[19]LI W J,WU Y L,HUANG R X,et al.Effect of Si addition on the mechanical and thermal properties of sintered reaction bonded silicon nitride[J].J Eur Ceram Soc,2017,37(15):4491-4496.
[20]GU L,YUAN W H,LIAO R,et al.Effect of Ti O2 addition on the microstructures,mechanical and dielectric properties of porous Si3N4-based ceramics[J].Adv Appl Ceram,2017,116(6):1-7.
[21]王妍月,刘新,曲殿利,等.添加TiO2对反应烧结制备SiAlON的影响[J].耐火材料,2018,52(2):109-113.WANG Yanyue,LIU Xin,QU Dianli,et al.Refractories(in Chinese),2018,52(2):109-113.