为研:究微量纳米铜添加到铁基粉末冶金件中烧结时对粒界扩散的作用.试验选择添加0.5%纳米铜的铁基粉末,通过高能球磨混合压制成样品,分别在不同温度相同保温时间及相同温度不同保温时间进行烧结,将上述试样冲击产生断口,通过SEM观察断口上纳米铜形貌变化.结果表明,纳米铜在铁基粉末冶金制品烧结过程中,保温时间相同随烧结温度升高和在相同烧结温度下随保温时间的延长在界面上发生快速吸附、溶解和扩散,使其团聚长大,在较低温度溶解于铁基粉末颗粒表面,明显降低烧结温度,由传统的工艺温度1180℃降低到920℃.
The effect of nano-copper powder on grain boundary diffusion of Fe-base powder metallurgy parts was investigate& The tested samples with the addition of 0.5% nano-eopper powder and Fe-base powder were mixed by high-energy ball milling and then were sintered at different temperatures and temperature keeping time. The change of nano-copper morphology of impact fracture surface was observed by scan electrical micros-copy (SEM). Results show that nano-copper particles exhibit rapid adsorption, diffusion and dissolution at Fe-base powder particle interface with the increased sintering temperature at the same temperature keeping time and the extended temperature keeping time at the same sintering temperature, which results in the accu-mulation and growth of nano-copper particles. The nano-copper particles are dissolved at the nano-Fe powder surface at low sintering temperature, and decrease the sintering temperature from 1180 ℃ to 920 ℃.
参考文献
| [1] | Yannick Champion;Cyril Langlois;Sandrine Guerin .Analysis of ductility of nanostructured copper prepared by powder metallurgy[J].Engineering Fracture Mechanics,2008(12):3624-3632. |
| [2] | N. R. Tao;Z. B. Wang;W. P. Tong;M. L. Sui;J. Lu;K. Lu .An investigation of surface nanocrystallization mechanism in Fe induced by surface mechanical attrition treatment[J].Acta materialia,2002(18):4603-4616. |
| [3] | Tong WP;Han Z;Wang LM;Lu J;Lu K .Low-temperature nitriding of 38CrMoAl steel with a nanostructured surface layer induced by surface mechanical attrition treatment[J].Surface & Coatings Technology,2008(20):4957-4963. |
| [4] | Jun Yang;Jiqiang Ma;Weimin Liu .Large-scale Fe-C nanoeutectic alloy prepared by a self-propagating high-temperature synthesis casting route[J].Scripta materialia,2008(12):1074-1077. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%