纳米η-Al_2O_3热压烧结制备氧化铝陶瓷
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摘要
以纳米η-Al_2O_3粉体为原料,MgO为烧结助剂,采用热压烧结工艺制备高纯氧化铝陶瓷。采用Archimedes法、SEM和三点弯曲法研究了氧化铝陶瓷的致密性、显微结构和力学性能。结果表明:纳米η-Al_2O_3尺寸小、活性高,热压烧结时1084℃晶型转变为α-Al_2O_3;添加适量的Mg O在烧结时生成液相,促进离子间的扩散,进而加速了反应烧结,1.0wt.%是Mg O的最佳添加入量;1400℃试样的相对密度高达99.2%,平均晶粒尺寸约为2μm,晶粒大小均匀;试样的抗弯强度和断裂韧性分别达到475 MPa和5.1 MPa·m~(1/2)。
High-purity alumina ceramics were fabricated by hot-pressed sintering using MgO as additive. Nano-η-Al_2O_3 powder was used as the raw material. The densification, microstructure evolution and mechanical properties of the alumina ceramics were studied by the Archimedes method, SEM and the three-point bending test. The results show that the nano-η-Al_2O_3 is small in size and high in activity, and it is transformed to α-Al_2O_3 at 1084 °C; the addition of MgO can produce liquid phase during sintering, promote ion diffusion and accelerate reaction sintering, and the optimum content of MgO of 1.0 wt.% is found. The relative density of the sample sintered at 1400 °C is 99.2%,and there is a more uniform distribution of matrix grains with an average size of 2 μm. The bending strength and the fracture toughness of the sample are 475 MPa and 5.1 MPa·m~(1/2), respectively.
High-purity alumina ceramics were fabricated by hot-pressed sintering using MgO as additive. Nano-η-Al_2O_3 powder was used as the raw material. The densification, microstructure evolution and mechanical properties of the alumina ceramics were studied by the Archimedes method, SEM and the three-point bending test. The results show that the nano-η-Al_2O_3 is small in size and high in activity, and it is transformed to α-Al_2O_3 at 1084 °C; the addition of MgO can produce liquid phase during sintering, promote ion diffusion and accelerate reaction sintering, and the optimum content of MgO of 1.0 wt.% is found. The relative density of the sample sintered at 1400 °C is 99.2%,and there is a more uniform distribution of matrix grains with an average size of 2 μm. The bending strength and the fracture toughness of the sample are 475 MPa and 5.1 MPa·m~(1/2), respectively.
引文
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[15]BARIN I.Thermochemical Data of Pure Substances[M].CHENG Nai-Liang,NIU Si-Tong,XU Gui-Ying(Trans.).Beijing:Science Press,2003:48-51.
[2]储爱民,王志谦,张德智,等.Al2O3基陶瓷材料增韧的研究进展[J].材料导报,2017,31(29):363-383.CHU A M,WANG Z Q,ZHANG D Z,et al.Materials Review,2017,31(29):363-383.
[3]LóH N J,SIM?O L,FALLER C A,et al.A review of two-step sintering for ceramics[J].Ceramics International,2016,42(11):12556-12572.
[4]殷剑龙,王修慧,张野,等.烧结助剂对高纯氧化铝陶瓷致密化过程的作用[J].稀土,2014,35(5):16-20.YIN J L,WANG X H,ZHANG Y,et al.Chinese Rare Earths,2014,35(5):16-20.
[5]李悦彤,杨静.氧化铝陶瓷低温烧结助剂的研究进展[J].硅酸盐通报,2011,30(6):1329-1332.LI Y T,YANG J.Bulletin of the Chinese Ceramic Society,2011,30(6):1329-1332.
[6]SUN R J,SHEN S G,ZHANG D F,et al.Hydrofining of coal tar light oil to produce high octane gasoline blending components overγ-Al2O3 andη-Al2O3 supported catalysts[J].Energy Fuels,2015,29(11):7005-7013.
[7]FARAJIMOTLAGH M,POURSALEHI R,ALIOFKHAZRAEIM.Synthesis mechanisms,optical and structural properties ofη-Al2O3 based nanoparticles prepared by DC arc discharge in environmentally friendly liquids[J].Ceramics International,2017,43(10):7717-7723.
[8]JO H,JUNG H,PARK J,et al.Surface modification ofη-Al2O3by SiO2 impregnation to enhance methanol dehydration activity[J].Bulletin of the Korean Chemical Society,2017,38(3):307-312.
[9]DYNYS F W,HALLORAN J W.Alpha alumina formation in alum-derived gamma alumina[J].J Am Ceram,2010,65(9):442-448.
[10]李江,潘裕柏,刘钰,等.热压烧结细晶粒氧化铝陶瓷[J].硅酸盐学报,2009,37(2):270-274.LI J,PAN Y B,LIU J,et al.Journal of the Chinese Ceramic Society,2009,37(2):270-274.
[11]孙阳,徐鲲濠,孙加林,等.MgO烧结助剂对氧化铝多孔陶瓷结构和性能的影响[J].硅酸盐学报,2015,43(9):1256-1260.SUN Y,XU K H,SUN J L,et al.Journal of the Chinese Ceramic Society,2015,43(9):1256-1260.
[12]高昌乐,王子敬,刘凯凯,等.两步常压烧结工艺对氧化铝陶瓷制备及性能的影响[J].铸造技术,2017,38(6):1269-1273.GAO C L,WANG Z J,LIU K K,et al.Foundry Technology,2017,38(6):1269-1273.
[13]NIIHARA K,MORENA R,HASSELMAN D P H.Evaluation of KIC of brittle solid by the indentation method with low crack-to-ident ratios[J].J Mater Sci Lett,1982,1(1):13-16.
[14]张超,张玲,郑培毓,等.纳米η-Al2O3无压烧结制备单相氧化铝陶瓷[J].人工晶体学报,2018,47(5):1049-1054.ZHANG C,ZHANG L,ZHENG P Y,et al.Journal of Synthetic Crystals,2018,47(5):1049-1054.
[15]BARIN I.Thermochemical Data of Pure Substances[M].CHENG Nai-Liang,NIU Si-Tong,XU Gui-Ying(Trans.).Beijing:Science Press,2003:48-51.