在Fe-2%Ni-1%Cu-0.6%C混合料中加入了少量微细Fe2O3粉末作为烧结助剂，研究Fe2O3粉末的添加量对混合料的压缩性、烧结合金的密度和强度以及氧和碳含量等的影响，研究微细Fe2O3粉末对合金的助烧结行为。结果表明：混合料中Fe2O3含量大于0.3%(质量分数)时，会导致成形生坯密度下降；当Fe2O3添加量为0.3%时，烧结合金的密度最高，经1120℃烧结0.5和1 h后，合金的抗弯强度比同等烧结条件下未添加Fe2O3样品的分别提高6.5%和4.2%。少量 Fe2O3粉在材料烧结时对碳含量损失率的影响较小，然而可以降低烧结体中的氧含量。在压坯的烧结过程中，Fe2O3还原后于750℃左右开始加速基体颗粒间的连结，虽然在1050℃以上时微细粉的助烧结作用减弱，但烧结体中孔隙更趋于球化。
Fe-2%Ni-1%Cu-0.6%C powder premix was prepared with minor ultrafine Fe2O3 powder as a sintering aid. The effects of Fe2O3 addition on compressibility of the mixture, sintered density, strength of the alloy and its oxygen and carbon content were studied. The assist-sintering behavior of ultrafine Fe2O3 powder was also investigated. The results show that the green density decreases when the Fe2O3 content is above 0.3%, while the highest density of sintered alloy is obtained with 0.3%Fe2O3 addition. And the flexural strengths of the alloy sintered at 1120℃for 0.5 h and 1 h increase by 6.5% and 4.2%, respectively, compared with that of sample without Fe2O3 powder addition. Minor ultrafine Fe2O3 powder has slight effect on the loss rate of C content of the sintered alloy, and yet the oxygen content is reduced. It is observed that the metallurgy bonding between matrix particles is accelerated from about 750 ℃ for the reduction of Fe2O3 particles. Though the assist-sintering function of ultrafine powder weakens when the temperature is above 1050℃, the pole shape in the sintered alloy is apt to spheroidize.
参考文献
| [1] | Narasimhan KS. .Sintering of powder mixtures and the growth of ferrous powder metallurgy[J].Materials Chemistry and Physics,2001(1/3):56-65. |
| [2] | 黄伯云,易健宏.现代粉末冶金材料和技术发展现状（一）[J].上海金属,2007(03):1-7. |
| [3] | Francis Hanejko,申小平,韩凤麟.粉末冶金齿轮材料进展[J].粉末冶金工业,2010(03):40-46. |
| [4] | 王玮晔;NARASIMHAN K S;余卫民.北美地区粉末冶金发展报告[J].现代零部件,2011(08):30-32. |
| [5] | K.S.Narasimhan,F.J.Semel,韩凤麟.预混合粉材料烧结[J].粉末冶金工业,2009(05):1-11. |
| [6] | 朱权利,周建仁.粉末冶金Fe-C-Cu-Cr-Mn的组织与性能研究[J].热加工工艺,2014(08):87-90,94. |
| [7] | 张德金,罗丰华,高翔,王翔,雷龙林,崔建民.Cu、C添加量对退火态Fe-1.75Ni-0.50Mo粉末烧结合金组织和力学性能的影响[J].粉末冶金技术,2011(02):125-129,136. |
| [8] | 张晓宇,赵训茶,季长涛,王淮,鞠育平.添加纳米粉体对铁基粉末烧结件组织与性能的影响[J].长春工业大学学报（自然科学版）,2008(01):41-43. |
| [9] | 王文浩,尹海清,曲选辉,Dil Faraz Khan.纳米铜粉对高速压制铁基粉末冶金零件性能的影响[J].北京科技大学学报,2013(10):1340-1345. |
| [10] | 崔洪梅,刘宏,王继扬,李霞,韩峰.纳米粉体的团聚与分散[J].机械工程材料,2004(08):38-41. |
| [11] | 牟科强.氧化物共还原制取W-Cu和Mo-Cu复合材料的研究[J].粉末冶金工业,2004(05):13-16. |
| [12] | 罗铁钢,蔡一湘,曲选辉,秦明礼.粉末注射成形纯钨的活化烧结致密化研究[J].机械工程学报,2013(18):63-68. |
| [13] | 刘东华,刘咏,韩云娟,刘祖铭.铁基高温合金氧化物强化相的形成和演化[J].中国有色金属学报,2010(06):1143-1148. |
| [14] | Ohtsuka S;Ukai S;Fujiwara M .Nano-mesoscopic structural control in 9CrODS ferritic/martensitic steels[J].Journal of Nuclear Materials: Materials Aspects of Fission and Fusion,2006(1/3):241-246. |
| [15] | DANNINGER H;KREMEL S;LEITNER G;JAENICKE-ROBLER K, YU Y.Degassing during sintering of Cr-Mo steels prepared from prealloyed powder[A].Prinston:Metal Powder Industries Federation,2002:291-301. |
| [16] | 王兴庆,钟军华.低温还原制取超细铁粉的研究[J].粉末冶金工业,2007(06):14-18. |
| [17] | 黄培云.粉末冶金原理[M].北京:冶金工业出版社,1997:18-19. |
| [18] | H. Danninger;C. Gierl .New Alloying Systems for Ferrous Powder Metallurgy Precision Parts[J].Science of sintering,2008(1):33-46. |
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