陶瓷纤维增强堇青石质陶瓷材料的研究
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摘要
为了制得热膨胀系数小、力学性能好的优质堇青石质陶瓷材料,以粒径≤0.074 mm的黏土、d_(50)=1μm的SiO_2微粉和≤0.074 mm的轻烧MgO为原料,按照堇青石的理论组成进行配料,外加质量分数10%的硅酸铝陶瓷纤维或多晶莫来石纤维,采用挤出方式成型,分别于1 250、1 300和1 350℃保温3 h制得堇青石质陶瓷材料。采用国标检测了试样的常温物理性能和热膨胀系数,采用X射线衍射仪和扫描电镜对试样的物相组成和显微结构进行了分析。结果表明:1 350℃保温3 h制得的堇青石质陶瓷材料的热膨胀系数较低,力学性能较好;试样以堇青石相为主晶相,堇青石相在引入的硅酸铝陶瓷纤维表面生成且基本呈定向分布。
In order to obtain high quality cordierite-based ceramics with low thermal expansion coefficient and good mechanical properties,cordierite-based ceramics were prepared through the extrusion molding method and fired at 1 250 ℃,1 300 ℃,1 350 ℃ for 3 h,respectively. The formulation was based on the theoretical composition of cordierite using clay( ≤0. 074 mm),silica micropowder( d_(50)= 1 μm) and light-burned MgO( ≤0. 074 mm) as the starting materials and extra-adding 10 mass% aluminum-silicate ceramic fiber or polycrystalline mullite fiber. The cold physical properties and thermal expansion coefficient of the synthesized cordierite-based ceramics were determined according to national standards. The phase composition and microstructure were analyzed by an X-ray diffractometer and a scanning electron microscope. The results show that cordierite-based ceramics synthesized at 1 350 ℃ for 3 h have low thermal expansion coefficient and good mechanical properties. The main crystalline phase is cordierite,which grows on the surface of the introduced aluminum-silicate ceramic fibers and mainly directionally distributes in the specimens.
In order to obtain high quality cordierite-based ceramics with low thermal expansion coefficient and good mechanical properties,cordierite-based ceramics were prepared through the extrusion molding method and fired at 1 250 ℃,1 300 ℃,1 350 ℃ for 3 h,respectively. The formulation was based on the theoretical composition of cordierite using clay( ≤0. 074 mm),silica micropowder( d_(50)= 1 μm) and light-burned MgO( ≤0. 074 mm) as the starting materials and extra-adding 10 mass% aluminum-silicate ceramic fiber or polycrystalline mullite fiber. The cold physical properties and thermal expansion coefficient of the synthesized cordierite-based ceramics were determined according to national standards. The phase composition and microstructure were analyzed by an X-ray diffractometer and a scanning electron microscope. The results show that cordierite-based ceramics synthesized at 1 350 ℃ for 3 h have low thermal expansion coefficient and good mechanical properties. The main crystalline phase is cordierite,which grows on the surface of the introduced aluminum-silicate ceramic fibers and mainly directionally distributes in the specimens.
引文
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[18]穆柏春.增强相表面改性提高陶瓷基复合材料性能研究[D].沈阳:东北大学,2005.
[19]XU G S,WANG K,ZHONG Z X,et al.Si C nanofiber reinforced porous ceramic hollow fiber membranes[J].J Mater Chem A,2014,2(16):5841-5846.
[2]KURAMA S,OZEL E,AY N,et al.Synthesis and sintering of cordierite at low temperature from kaolin and magnesium hydroxide[J].Key Eng Mater,2004,264-268(11):925-928.
[3]ACIMOVIC Z,PAVLOVIC L,TRUMBULOVIC L,et al.Synthesis and characterization of the cordierite ceramics from nonstandard raw materials for application in foundry[J].Mater Lett,2003,57(18):2651-2656.
[4]刘少文,尹玲玲,王文灿,等.堇青石结构化催化剂载体的研究进展[J].武汉工程大学学报,2010,32(7):53-57.
[5]ZHANG R D,HEDJAZI K,CHEN B H,et al.M(Fe,Co)-BEA washcoated honeycomb cordierite for N2O direct decomposition[J].Catal Today,2016,273:273-285.
[6]李金洪,鲁安怀,宋庭兵,等.新型环境矿物材料——堇青石质泡沫陶瓷的研制[J].矿物学报,2001,21(3):481-484.
[7]AL-HARBI O A,OZGUR C,KHAN M M.Fabrication and characterization of single phase cordierite honeycomb monolith with porous wall from natural raw materials as catalyst support[J].Ceram Int,2015,41(3):3526-3532.
[8]蔡俊修,陈笃慧,万惠霖.控制大气污染用的蜂窝陶瓷材料[J].硅酸盐学报,1994,22(5):458-468.
[9]任强,武秀兰.合成堇青石陶瓷材料的研究进展[J].中国陶瓷,2004,40(5):23-25.
[10]段满珍,杨立荣,黄转红.合成堇青石材料的烧成制度研究[J].耐火材料,2011,45(4):285-287.
[11]江伟辉,余琴仙,苗立锋,等.不同原料及合成温度对合成堇青石膨胀系数的影响[J].陶瓷学报,2009,30(3):52-55.
[12]李萍,杜永娟,俞浩,等.锂辉石与氧化锆对堇青石陶瓷热膨胀率的影响[J].耐火材料,2003,37(3):139-141.
[13]郭伟,陆洪彬,冯春霞,等.Nd2O3对稻壳合成多孔堇青石陶瓷的影响[J].人工晶体学报,2010,39(4):1025-1029.
[14]NAGA S M,MORTEL H,IBRAHIM D M.Low thermal expansion honeycomb cordierite containing rice-husk ash[J].Ind Ceram,1994,14(3):116-119.
[15]HAN F,ZHONG Z X,YANG Y,et al.High gas permeability of Si C porous ceramics reinforced by mullite fibers[J].J Eur Ceram Soc,2016,36(16):3909-3917.
[16]DONG X,SUI G F,GUO A R,et al.Synthesis and properties of lightweight flexible insulant composites with a mullite flber-based hierarchical heterostructure[J].Che Eng J,2015,277:159-167.
[17]WANG Y,CHENG H F,WANG J.Effects of the single layer CVD Si C interphases on mechanical properties of mullite fiber-reinforced mullite matrix composites fabricated via a sol-gel process[J].Ceram Int,2014,40(3):4707-4715.
[18]穆柏春.增强相表面改性提高陶瓷基复合材料性能研究[D].沈阳:东北大学,2005.
[19]XU G S,WANG K,ZHONG Z X,et al.Si C nanofiber reinforced porous ceramic hollow fiber membranes[J].J Mater Chem A,2014,2(16):5841-5846.