将掺Ca铬酸镧与Al2O3混合,在1650℃烧结得到氧化铝量从0～100%(摩尔分数)的系列Al2O3/La0.9Ca0.1CrO3复合材料烧结体.研究得出Al2O3/La0.9Ca0.1CrO3系统是热力学不稳定的,高温烧结时存在离子扩散,烧结体的最终相组成与Al2O3量有关.复合材料中氧化铝含量较低时(≤20%,摩尔分数)可以提高铬酸镧粉体的烧结性能;当氧化铝含量在30%～70%(摩尔分数)之间时,生成的层片状六铝酸镧使烧结致密度降低,并在氧化铝含量为70%(摩尔分数)时达到最低值,随后试样的相对密度又逐渐增大.
参考文献
| [1] | Andrianov M A;Balkevich V L;Sotnikov V E .Use of lanthanum chromite for making electric heaters[J].Refractories and Industrial Ceramics,1980,21(11-12):592-596. |
| [2] | 王峰,李德辉,成宇,孙良成,周天亮,史守华.掺杂BaTiO3对LaCrO3电阻率的影响[J].稀土,2009(05):26-29. |
| [3] | Oikawa K.;Hashimoto T.;Shimojyo Y.;Morii Y.;Kamiyama T. .Structural phase transition of orthorhombic LaCrO3 studied by neutron powder diffraction[J].International Journal of Quantum Chemistry,2000(2):524-529. |
| [4] | Yasuda I.;Yamakawa T.;Koyama T.;Matsuzaki Y. .Electrical conductivity and mechanical properties of alumina-dispersed doped lanthanum gallates[J].Solid state ionics,2000(1/4):381-388. |
| [5] | Sora I Natali;Pelosato R;Dotelli G et al.The system Al2O3 and(Sr,Mg)-doped LaGaO3:phase composition and electrical properties[J].Solid State Ionics,2005,176(1-4):81-88. |
| [6] | Delmastro A;Geobaldo F;Vallino M et al.Solid state equilibria in the system Al2O3-La2O3-Cr2O3:reactivity catalyst/support LacrO3/Al2O3[J].Journal of the European Ceramic Society,1998,18(06):607-611. |
| [7] | Minh N Q .Ceramic fuel cells[J].Journal of the American Ceramic Society,1993,76(03):563-588. |
| [8] | Masashi Mori;Yoshiko Hiei;Tohru Yamamoto .Control of the Thermal Expansion of Strontium-Doped Lanthanum Chromite Perovskites by B-site Doping for High-Temperature Solid Oxide Fuel Cell Separators[J].Journal of the American Ceramic Society,2001(4):781-786. |
| [9] | Mori M.;Yamamoto T.;Ichikawa T.;Takeda Y. .Dense sintered conditions and sintering mechanisms for alkaline earth metal (Mg, Ca and Sr)-doped LaCrO3 perovskites under reducing atmosphere[J].Solid state ionics,2002(1/2):93-101. |
| [10] | 郑向江,郭灿雄,文明芬,王来军.（Ce-Zr）mA1-mO2复合氧化物的制备及其表征[J].稀土,2008(05):40-43. |
| [11] | MacKenzie K J D;Schmucker M;Mayer L .Evolution of crystalline aluminatas from hybrid gel-derived precursors studied by XRD and multinuclear solid state MAS NMR Ⅲ.Lanthanum hexaluminate,LaAl11O18[J].Thermochimica Acta,1999,335(1-2):73-78. |
| [12] | 李士刚,李胜利,孙良成,李德辉,敖青.掺铝铬酸镧烧结过程的相变特征[J].金属热处理,2004(10):4-7. |
| [13] | 孙良成,朱新德,李胜利,李德辉,敖青.掺钙铬酸镧显微组织、性能与制备工艺的关系[J].稀土,2005(01):33-36. |
| [14] | 杨尚林;张宇;桂太龙.材料物理导论[M].哈尔滨:哈尔滨工业大学出版社,1999:212-222. |
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