以氢直流电弧法制备CeHx纳米粉末,再采用放电等离子(SPS)反应液相烧结纳米CeHx和微米B的混合粉末,制备了高性能CeB6多晶块体热阴极材料.研究了SPS制备CeB6的烧结反应式及反应液相烧结机制,确定SPS烧结CeB6的最佳工艺为:压力50MPa,烧结温度1500℃,保温时间5min.实验结果表明,SPS制备得到了高纯单相CeB6多晶块体.纯度达到99.89%,相对密度达到99.61%,维氏硬度达到2051kg/mm2,抗弯强度达到254.2MPa.样品在1600℃温度下拐点发射电流密度达到20.38A/cm2,功函数为2.42eV.与传统制备法相比,SIS制备显著降低了CeB6的烧结温度,缩短了烧结时间,提高了力学和发射性能.
参考文献
[1] | Gygax F N,Schenck A.Journal of Alloys and Compounds,2005,404-406(11):360-364. |
[2] | Nakao H.J.Phys.Soc.Japan,2001,70(2):1857-1858. |
[3] | Wieslawa Sikora,Franciszek Bialas,Lucian Pytlik,et al.Solid State Science,2005,7(6):645-655. |
[4] | Balakrishnan G,Lees M R,McK Paul D,et al.Journal of Crystal Growth,2003,256(1/2):206-209. |
[5] | Zou Chun Yun,Zhao Yan Ming,Xu Jun Qi,et al.Journal of Crystal Growth,2006,291(1):112-116. |
[6] | Togawaa K,Babaa H,Onoea K,et al.Nuclear Instruments and Methods in Physics Research A,2004,528(4):312-315. |
[7] | Otani S,Nakagawa H,Nishi Y,et al.Journal of Solid State Chemistry,2000,154(1):238-241. |
[8] | Swanson L W,Mcneely D R.Surface Science,1979,83(1):11-28. |
[9] | Togawa K,Shintake T,Inagaki T,et al.Physical Review Special Topics-Accelerators and Beams,2007,10(2):020703-1-10. |
[10] | Masatoshi Takeda,Tadahiro Fukuda,Fetter Domingo,et al.Journal of Solid State Chemistry,2004,177 (1):471-475. |
[11] | 果世驹.粉末烧结理论.北京:冶金工业出版社,2007:288-289 |
[12] | 徐光宪.稀土.北京:冶金工业出版社,2002:327-328. |
[13] | 周身林,刘丹敏.张久兴(ZHOU Shen-Lin,et al).无机材料学报(Journal of Inorganic Materials),2008,23(6):1201-1204. |
[14] | 江剑平,翁甲辉.阴极电子学与气体放电原理,北京:国防工业出版社,1980:252-253. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分:
-
10%
-
20%
-
30%
-
40%
-
50%