金属学报  2012, Vol. 48 Issue (3): 379-384    DOI: 10.3724/SP.J.1037.2011.00612

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不同粒径Ti粉的高速压制行为和烧结性能

闫志巧1, 2), ,陈峰1),  蔡一湘1)

1) 广州有色金属研究院, 广州 510650 2) 中南大学粉末冶金国家重点实验室, 长沙 410083

HIGH VELOCITY COMPACTION BEHAVIOR AND SINTERED PROPERTIES OF Ti POWDERS WITH DIFFERENT PARTICLE SIZES

YAN Zhiqiao1, 2), CHEN Feng1),  CAI Yixiang1)

1) Guangzhou Research Institute of Nonferrous Metals, Guangzhou 510650 2) State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083

闫志巧 陈峰 蔡一湘. 不同粒径Ti粉的高速压制行为和烧结性能[J]. 金属学报, 2012, 48(3): 379-384.
, , . HIGH VELOCITY COMPACTION BEHAVIOR AND SINTERED PROPERTIES OF Ti POWDERS WITH DIFFERENT PARTICLE SIZES[J]. Acta Metall Sin, 2012, 48(3): 379-384.

摘要 参考文献 相关文章 Metrics 全文: PDF(2538 KB)   摘要: 以平均粒径为150, 75, 48和38 μm的4种Ti粉为原料(依次定义为A, B, C和D粉末), 采用高速压制技术进行成形, 考察粉末粒径对压坯密度、最大压制力和脱模力的影响, 进一步研究粉末的高速压制特性和压坯的烧结性能. 结果表明, 高速压制的压坯密度与粉末粒径和松装密度有关. 冲击能量较小时, 压坯密度主要取决于松装密度, 而冲击能量较高时, 则主要取决于粉末粒径. 在冲击能量≦761 J下成形时, 具有最大松装密度的B粉末所获得的压坯密度最高; 进一步增大冲击能量, 平均粒径最大的A粉末所获得的压坯密度最高. 粉末粒径对压坯密度和最大压制力具有相似的影响, 并且4种粉末的最大压制力和压坯密度之间的关系均符合黄培云压制方程; 但粉末粒径对脱模力无明显影响. 试样的烧结密度随粒径的细化而增加, 同时伴随着不同程度的晶粒长大. 4种压坯经1250 ℃真空烧结后, 最终均获得了近全致密的试样. 关键词 ： 高速压制,  Ti粉,  粒径,  密度,  黄培云压制方程     Abstract：The Ti powder forming is more difficult through traditional pressing methods due to inductile and high hardening rate of Ti. Some advanced forming methods, although, are effective for increasing the green density, such as hot--pressing and isothermal--statistic pressing, they are too expensive. In our previous research, it has been demonstrated that compacting high green density of Ti powders would be achieved by high velocity compaction (HVC) which seems to be an attractive candidate that has an excellent balance between performance and cost in forming Ti powders. In this paper, the four Ti powders with average particle size of 150, 75, 48 and 38 μm, namely A, B, C, and D powder, were separately pressed by HVC technology. The influences of particle size on the green density, the maximum impact force and withdraw force in compacting were investigated. The compactability features of the four powders in HVC and the properties of sintered samples were studied. The results show that the green density of compacts obtained by HVC method is related with both particle size and apparent density. At relatively small impact energy, the green density of compacts is mainly determined by the apparent density of powders. While at larger impact energy, it is mainly determined by the particle size. For powders pressed at impact energy lower than 761 J, the highest green density is obtained for compacts made of B powders which has maximum apparent density. With higher impact energy, the highest green density is obtained for compacts made of A powder which has maximum particle size. It is found that the influence of particle size on the maximum impact force is similar to those on the green density, and for the four powders the relationships between the maximum impact force and the green density all comply with Huang Pei-yun equation. Particle size shows no observable influence on withdraw force. The sintered density increases with decreasing particle size of powders, accompanying with grain growth of different degrees. After vacuum sintering at 1250 ℃, nearly fully dense samples can be prepared for the compacts of four powders. Key words： high velocity compaction    Ti powder    particle size    density    Huang Pei-yun equation 收稿日期: 2011-09-28      ZTFLH:  TF124.36   基金资助: 国家自然科学基金项目 51004040和粉末冶金国家重点实验室开放课题20110952K资助 作者简介: 闫志巧, 女, 1980年生, 博士 服务 把本文推荐给朋友 加入引用管理器 E-mail Alert RSS 作者相关文章 闫志巧 陈峰 蔡一湘 44.8K 链接本文: https://www.ams.org.cn/CN/10.3724/SP.J.1037.2011.00612      或      https://www.ams.org.cn/CN/Y2012/V48/I3/379 [1] Liu Y, Chen L F, Tang H P, Liu C T, Liu B, Huang B Y. Mater Sci Eng, 2006; A418: 25 [2] Abkowitz S, Abkowitz S M, Fisher H, Schwartz P J. JOM, 2004; 56: 37 [3] Liu G C, Shi Y S, Wei Q S, Wang J W. Key Eng Mater, 2010; 450: 206 [4] Saito T. JOM, 2004; 56: 33 [5] Skoglund P. Powder Metall, 2001; 44(3): 15 [6] Grant C E. Met Powder Rep, 2001; 56: 6 [7] Sethi G, Hauck E, German R M. Mater Sci Technol, 2006; 22: 955 [8] Barendvanden B, Christer F, Tomas L. Powder Metall, 2006; 49: 107 [9] Doremus P, Guennec Y L, Imbault D, Puente G. 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