高温熔凝法制备Y_2O_3/Sm_2O_3双掺杂Al_2O_3-ZrO_2共晶陶瓷的微观组织及力学性能
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摘要
探索大尺寸共晶陶瓷的制备方法对其工业化应用具有重要意义。采用高温熔凝法制备了直径20 mm,不同Y_2O_3/Sm_2O_3含量的Al_2O_3-ZrO_2共晶陶瓷,研究了Y/S(Y_2O_3/Sm_2O_3)双掺杂对Al_2O_3-ZrO_2共晶陶瓷微观组织和力学性能的影响。结果表明,随掺杂量增加,共晶形貌由横截面呈三角形的共晶晶团转变为有尖端分裂特征的海藻状共晶,且共晶晶团内部的ZrO_2相由对称分布的规则纤维状转变为无序分布的层片状。较单一掺杂Y_2O_3相比,双掺杂时共晶形貌转变发生在较小的掺杂量(3mol%),且掺杂量较高时(4.4mol%)SmAlO_3相优先形成。掺杂量为2.2mol%时硬度达到最大值17.29±0.50 GPa。断裂韧性在低掺杂量时较高,随掺杂量继续增大,断裂韧性不断减小。
Exploring the preparation method of large-size eutectic ceramics is of great significance for its industrial application.Al_2O_3-ZrO_2eutectic bulks containing 0-4.4mol%Y_2O_3/Sm_2O_3(the molar ratio of Y_2O_3 to Sm_2O_3 is 1:1)were prepared by the high temperature melting method.The influence of co-doping amount of Y/S(Y_2O_3/Sm_2O_3)on the eutectic microstructure and some mechanical properties were investigated.The results demonstrated that the solidification structure changed from the eutectic cellular to eutectic seaweed as the co-doping amount of Y/S increased.The tip splitting was observed in eutectic seaweed and the zirconia phase inside the colony underwent a transition from a three-fold symmetric distribution of zirconia fibers to disordered dispersion of fine ZrO_2 lamellae with the increase of the doping content.Y_2O_3 was easier to dissolve in the zirconia phase than Sm_2O_3 because of Y/S co-doped Al_2O_3–Zr O_2 eutectic,which resulted in more Sm_2O_3 piled up in front of the S/L interface and the enhanced transformation of the eutectic morphology and the formation of SmAlO_3 phase.The co-doping of Y/S is beneficial to increase the hardness of Al_2O_3-Zr O_2 eutectic ceramics.The hardness value reached 17.29±0.50 GPa at room temperature for 2.2mol%Y/S co-doped Al_2O_3–Zr O_2 eutectic bulk.However,the fracture toughness decreased with the increase of Y/S doping content.
Exploring the preparation method of large-size eutectic ceramics is of great significance for its industrial application.Al_2O_3-ZrO_2eutectic bulks containing 0-4.4mol%Y_2O_3/Sm_2O_3(the molar ratio of Y_2O_3 to Sm_2O_3 is 1:1)were prepared by the high temperature melting method.The influence of co-doping amount of Y/S(Y_2O_3/Sm_2O_3)on the eutectic microstructure and some mechanical properties were investigated.The results demonstrated that the solidification structure changed from the eutectic cellular to eutectic seaweed as the co-doping amount of Y/S increased.The tip splitting was observed in eutectic seaweed and the zirconia phase inside the colony underwent a transition from a three-fold symmetric distribution of zirconia fibers to disordered dispersion of fine ZrO_2 lamellae with the increase of the doping content.Y_2O_3 was easier to dissolve in the zirconia phase than Sm_2O_3 because of Y/S co-doped Al_2O_3–Zr O_2 eutectic,which resulted in more Sm_2O_3 piled up in front of the S/L interface and the enhanced transformation of the eutectic morphology and the formation of SmAlO_3 phase.The co-doping of Y/S is beneficial to increase the hardness of Al_2O_3-Zr O_2 eutectic ceramics.The hardness value reached 17.29±0.50 GPa at room temperature for 2.2mol%Y/S co-doped Al_2O_3–Zr O_2 eutectic bulk.However,the fracture toughness decreased with the increase of Y/S doping content.
引文
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[2]王建萍,史云霞,巫邵波,等.等离子喷涂制备Al2O3-Cr2O3复相涂层组织及性能[J].陶瓷学报,2018,39(4):393-398.WANG J P,SHI Y X,WU S B,et al.Journal of Ceramics,2018,39(4):393-398.
[3]张贺,柳彦博,马壮,等.APS制备SiC/Al2O3复合陶瓷涂层组织结构与抗烧蚀性能的研究[J].陶瓷学报,2017,38(50):635-640.ZHANG H,LIU Y B,MA Z,et al.Journal of Ceramics,2017,38(50):635-640.
[4]冯鑫,刘涛,黎阳.磷酸盐结合法制备Al2O3多孔陶瓷及性能[J].人工晶体学报,2017,46(12):2332-2336.FENG X,LIU T,LI Y.Journal of Synthetic Crystals,2017,46(12):2332-2336.
[5]LEE J H,YOSHIKAWA A,FUKUDA T,et al.Growth and characterization of Al2O3/Y3Al5O12/Zr O2 ternary eutectic fibers[J].Journal of Crystal Growth,2001,231(1-2):115-120.
[6]ZHANG J,SU H,SONG K,et al.Microstructure,growth mechanism and mechanical property of Al2O3-based eutectic ceramic in situ composites[J].Journal of the European Ceramic Society,2011,31:1191-1198.
[7]WAKU Y,SAKUMA T.Dislocation mechanism of deformation and strength of Al2O3-YAG single crystal composites at high temperatures above 1500℃[J].Journal of the European Ceramic Society,2000,20:1453-1458.
[8]苏海军,王恩缘,任群,等.超高温氧化物共晶复合陶瓷研究进展[J].中国材料进展,2018,37(6):437-447.SU H J,WANG E Y,REN Q,et al.Materials China,2018,37(6):437-447.
[9]LEE J H,YOSHIKAWA A,KAIDEN H,et al.Microstructure of Y2O3 doped Al2O3/ZrO2 eutectic fibers grown by the micropulling-down method[J].Journal of Crystal Growth,2001,231(1-2):179-185.
[10]PASTOR J Y,POZA P,LLORCA J,et al.Mechanical properties of directionally solidified Al2O3-Zr O2(Y2O3)eutectics[J].Materials Science and Engineering A,2001,308:241-249.
[11]LLORCA J,ORERA V M.Directionally solidified eutectic ceramic oxides[J].Progress in Materials Science,2006,51:711-809.
[12]OLIETE P B,PENA J I,LARREA A,et al.Ultra-highstrength nano-fibrillar Al2O3-YAG-YSZ eutectics[J].Advanced Materials,2007,19(17):2313-2318.
[13]LLORCA J,PASTOR J Y,POZA P,et al.Influence of the Y2O3 content and temperature on the mechanical properties of melt-grown Al2O3-ZrO2 eutectics[J].Journal of the American Ceramic Society,2004,84(4):633-639.
[14]FU L S,FU X S,CHEN G Q,et al.Tailoring the morphology in Y2O3 doped melt-grown Al2O3/ZrO2 eutectic ceramic[J].Scripta Materialia,2017,129:20-24.
[15]FU L S,WANG Z,FU X S,et al.Microstructure and mechanical properties of Y2O3-doped melt-grown Al2O3-ZrO2eutectic ceramic[J].Materials Science&Engineering A,2017,703:372-379.
[16]LAURA L,SYLVIE L K,LEO M.Microstructure,interfaces and creep behavior of Al2O3-Sm2O3(ZrO2)eutectic ceramic composites[J].Journal of Materials Science,2017,52(10):489-5502.
[17]LEVI C G.Emerging materials and processes for thermal barrier systems[J].Current Opinion in Solid State and Materials Science,2004,8:77-91.
[18]LAKIZA S,LOPATO L.Phase diagrams of the systems Al2O3-ZrO2-Ln(Y)2O3 as source of multiphase eutectics for creating composite structural and functional materials[J].Journal of the European Ceramic Society,2011,31:1293-1303.
[19]NIIHARA K.A fracture mechanics analysis of indentationinduced Palmqvist crack in ceramics[J].Journal of Materials Science Letter,1983,2:221-223.
[20]ZHOU Y.Science of Ceramic Material[M].2nd ed.Beijing:Science Press,2004.
[21]MOLLARD F R,FLEMING M C.Growth of composites from the melt:I[A].Trans TMSAIME,1967,239(10):1534-1539.
[22]LEE J H,YOSHIKAWA A,DURBIN S D,et al.Microstructure of Al2O3/ZrO2 eutectic fibers grown by the micro-pulling down method[J].Journal of Crystal Growth,2001,222:791-796.
[23]PENA J I,MERINO R I,HARLAN N R,et al.Microstructure of Y2O3 doped Al2O3-ZrO2 eutectics grown by the laser floating zone method[J].Journal of the European Ceramic Society,2002,22:2595-2602.
[24]祖方遒.铸件成形原理[M].北京:机械工业出版社,2013:200-300.
[25]刘礼.深过冷Co-Sn共晶合金及其含少量第三组元的凝固[D].上海:上海交通大学博士论文,2011.
[26]LIU L,LI J F,ZHOU Y H.Solidification of undercooled eutectic alloys containing a third element[J].Acta Materialia,2009,57:1536-1545.
[27]ECHIGOYA J,TAKABAYASHI Y,SUTO H,Hardness and fracture toughness of directionally solidified Al2O3-ZrO2(Y2O3)eutectics[J].Journal of Materials Science Letter,1986,5(2):153-154.