通过高能球磨将一定成分的W,La2O3粉研磨成纳米粉,在真空热压炉中将其烧结为块体的纳米晶电极材料.利用X射线衍射仪(XRD)、透射电镜(TEM)和扫描电镜(SEM)等手段分析晶粒的变化情况.结果表明,烧结的致密化主要在于纳米颗粒的重排,而不是传统的扩散;烧结过程中出现晶粒长大现象,但长大有限;机械研磨产生的内应变、某些杂质元素的存在等对烧结有促进作用.
参考文献
| [1] | 吴永康 .Advances in Study on Low Temperature Plasma[J].物理,1990,20(02):80-84. |
| [2] | 金佑民;樊友三.低温等离子体物理基础[M].北京:清华大学出版社,1993 |
| [3] | 聂祚人;周美玲;张久兴 et al.Tungsten Electrode Material and Effect of Rare- earth Metallic Oxides on It[J].稀有金属材料与工程,1997,26(06):1-5. |
| [4] | WANG Jin-shu,ZHOU Mei-ling,ZHANG Jiu-xing,YAO Cao-gen,NIE Zuo-ren,ZUO Tie-yong.Function mechanism of carbide layer on surface of La2O3-Mo cathode[J].中国有色金属学会会刊(英文版),2001(01):26-29. |
| [5] | Mabuchi M;Okamoto K;Saito N et al.Deformation Behavior and Strengthening Mechanisms at Intermediate Temperatures in W- La2O3[J].Materials Science and Engineering A,1997,237:241-249. |
| [6] | 王发展,张晖,丁秉钧.W-ThO2电极材料的研究进展[J].兵器材料科学与工程,2001(04):61-64. |
| [7] | Hui Zhang;Xianfeng Chen;Zhimao Yang .W-ThO_2 thermionic cathode activated with nanoscale oxide[J].Materials Letters,1999(6):401-405. |
| [8] | Jerry P W;Nieh T G;Wadsworth J.Tungsten and Alloys[J].Current Advances in Materials and Processes,1992(09):28. |
| [9] | Chen Zhongchun;Zhou Meiling;Zuo Tieyong .Morphological Evolution of Second- phase Particales during Thermomechanical Processing of W- La2O3 Alloy[J].Scripta Materialia,2000,43:291-297. |
| [10] | Knight R;Smith R W;Apeliann D .Application of Plasma Arc Melting Technology to Processing of Recative Metals[J].International Materials Reviews,1991,36(06):221-252. |
| [11] | Pierre F;Armelle V .Thermal Plasma[J].IEEE Transactions on Plasma Science,1997,25(06):1258-1280. |
| [12] | Herberlein J V R.Plasma and Synthesis of Materials[A].New York:IEEE,1984:101. |
| [13] | Sadek A A et al.Effect of Rare Earth Metal Oxide Additions to Tungsten Electrodes[J].Metallurgical and Materials Transactions A:Physical Metallurgy and Materials Science,1990,21:3221-3236. |
| [14] | 贾佐成;康庄华;齐燕波 et al.[J].粉末冶金技术,1993,11(03):196-200. |
| [15] | 张立德;牟季美.纳米材料和纳米结构[M].北京:科学出版社,2001 |
| [16] | Young Do Kim;Jin Youl Chung;Jongryoul Kim;Hyeongtag Jeon .Formation of nanocrystalline Fe-Co powders produced by mechanical alloying[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2000(1/2):17-21. |
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