将化学计量比1:2的Al粉和B粉混合均匀后压制成Ф12mm的圆柱锭,在流通Ar气气氛下,分别于650,700,800,900和1000℃下烧结4 h后随炉冷却至室温,利用X射线衍射仪(XRD)和扫描电子显微镜(SEM)分别研究了合成的样品的物相组成和微观形貌.结果表明,烧结温度的升高不仅会使样品中AlB2的相含量发生变化,还伴随有AlB2颗粒的长大;在800℃时烧结可以得到相含量较多、颗粒尺寸相对较小的AlB2.此外,研究了在800℃时保温不同时间对AlB2合成反应的影响.在流通Ar气气氛中,将压制好的圆柱锭在800℃下分别保温0.5,2.0,4.0,6.0和10.0 h后将样品装置移出管式炉并于Ar气气氛中冷却至室温.物相和形貌分析表明保温时间也会使AlB2的相含量和颗粒尺寸发生变化,且AlB2颗粒随保温时间的延长有明显长大的趋势;综合考虑在800℃烧结时保温6 h效果最好.
参考文献
| [1] | Karabay S;Uzman I .Inoculation of transition elements by addition of AlB2 and AlB12 to decrease detrimental effect on the conductivity of 99.6% aluminium in CCL for manufacturing of conductor[J].Journal of Materials Processing Technology,2005,160:174. |
| [2] | A.C.Hall;J.Economy .Preparing high-and low-aspect ratio AlB_2 flakes from borax or boron oxide[J].JOM,2000(2):42-46. |
| [3] | Setzer W C;Boone G W.The use of aluminum/boron master alloys to improve electrical conductivity[A].Warrendale PA,USA:TMS,1992:837. |
| [4] | Friedrichs O;Kim J W;Remhof A;Buchter F Borgachulte A Wallacher D Cho Y W Fichtner M Oh K H Züttel A .The effect of Al on the hydrogen sorption mechanism of LiBH4[J].Physical Chemistry Chemical Physics,2009,11:1515. |
| [5] | Kim J W;Friedrichs O;Ahn Jae-Pyoung;Kim D H Kim S C Remhof A Chang Hee-Suk Lee J Shim Jae-Hyeok Cho Y W Züttel A Oh K H .Microstructural change of 2LiBH4/Al with hydrogen sorption cycling:Separation of Al and B[J].Scripta Materialia,2009,60:1089. |
| [6] | 叶大伦.实用无机物热力学数据手册[M].北京:冶金工业出版社,2001 |
| [7] | 张浩,王力军,罗远辉,尹延西,江洪林.锂硼合金的制备和性能研究[J].稀有金属,2008(02):140-143. |
| [8] | Zhu Hao;Wang Shumao;Li Zhinian;Liu Xiaopeng Jiang Lijan .Degradation behavior of MgB2 powders in different medium environment[J].Materials Science Forum,2010,650:172. |
| [9] | Reeve R .Method of producing an aluminium boride[P].UP:4604368,1986-08-05. |
| [10] | Matkovich V I;Economy J;Giese R F .Presence of carbon in aluminum borides[J].Journal of the American Chemical Society,1964,86:2337. |
| [11] | Nagamatsu,J;Nakagawa,N;Muranaka,T;Zenitani,Y;Akimitsu,J .Superconductivity at 39 K in magnesium diboride.[J].Nature,2001(6824610):63-64. |
| [12] | Felten E J .The preparation of aluminum diboride[J].Journal of the American Chemical Society,1956,78:5977. |
| [13] | Duschanek H;Rogl P .The Al-B(Aluminum-Boron)system[J].Journal of Phase Equilibria,1994,15(05):543. |
| [14] | Burkhardt U.;Gurin V.;Haarmann F.;Borrmann H.;Schnelle W.;Yaresko A. Grin Y. .On the electronic and structural properties of aluminum diboride Al0.9B2[J].International Journal of Quantum Chemistry,2004(2):389-394. |
| [15] | 李树棠.晶体X射线衍射学基础[M].北京:冶金工业出版社,1990 |
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%