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金属学报  2014, Vol. 50 Issue (6): 727-736    DOI: 10.3724/SP.J.1037.2013.00712
  本期目录 | 过刊浏览 |
93W-5.6Ni-1.4Fe高比重合金放电等离子主烧结曲线的建立*
胡可, 李小强(), 屈盛官, 杨超, 李元元
华南理工大学国家金属材料近净成形工程技术研究中心, 广州 510640
DEVELOPMENT OF MASTER SINTERING CURVE FOR SPARK PLASMA SINTERING OF 93W-5.6Ni-1.4Fe HEAVY ALLOY
HU Ke, LI Xiaoqiang(), QU Shengguan, YANG Chao, LI Yuanyuan
National Engineering Research Center of Near-Net-Shape Forming for Metallic Materials, South China University of Technology, Guangzhou 510640
引用本文:

胡可, 李小强, 屈盛官, 杨超, 李元元. 93W-5.6Ni-1.4Fe高比重合金放电等离子主烧结曲线的建立*[J]. 金属学报, 2014, 50(6): 727-736.
Ke HU, Xiaoqiang LI, Shengguan QU, Chao YANG, Yuanyuan LI. DEVELOPMENT OF MASTER SINTERING CURVE FOR SPARK PLASMA SINTERING OF 93W-5.6Ni-1.4Fe HEAVY ALLOY[J]. Acta Metall Sin, 2014, 50(6): 727-736.

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摘要: 

将主烧结曲线(MSC)理论应用于93W-5.6Ni-1.4Fe高比重合金的放电等离子烧结(SPS). 以加热速率100 ℃/min为临界点, 建立了2个不同加热速率阶段合金的主烧结曲线. 在2个不同加热速率阶段, 93W-5.6Ni-1.4Fe高比重合金的放电等离子烧结MSC曲线均可有效预测合金烧结全过程的致密化行为, 以及粉末压坯的收缩量和合金的最终烧结密度. 计算了93W-5.6Ni-1.4Fe高比重合金放电等离子烧结过程中的致密化函数c, 定量地证明了当加热速率大于100 ℃/min时, 随着温度升高, 合金的SPS致密化过程显著加快. 此外, 主烧结曲线理论计算得到的表观致密化激活能与采用Arrhenius公式计算所得到的致密化激活能基本一致.

关键词 W-Ni-Fe高比重合金SPS主烧结曲线加热速率表观致密化激活能    
Abstract

Tungsten heavy alloys are used for a number of applications, including radiation shields, counter weights, electrical contacts, vibration dampeners and kinetic energy penetrators. The most common compositions consist of W along with some combination of Ni, Fe, or Cu. The alloys are usually fabricated by the conventional powder metallurgy technique, in which the elemental blended powders are first compacted and then followed by a high temperature sintering. An important processing goal for this alloy is to obtain a high density with fine grain size. It is therefore desirable to predict its densification behavior and final density. Recently, the master sintering curve (MSC) theory provides a better understanding of whole sintering process. In previous work, the densification and grain growth mechanisms during spark plasma sintering (SPS) of 93W-5.6Ni-1.4Fe heavy alloy were investigated. In this investigation, the master sintering curve approach was first extended theoretically to spark plasma sintering of 93W-5.6Ni-1.4Fe heavy alloy. Two master sintering curves of 93W-5.6Ni-1.4Fe heavy alloy in different heating rate stages (with heating rate of 100 ℃/min as division point) during SPS process were developed. Both of the master sintering curves can effectively predict the densification behavior of 93W-5.6Ni-1.4Fe heavy alloy during SPS process, as well as the shrinkage and final density. The calculated densification function c quantitatively shows that the densification process increases with temperature when heating rate is higher than 100 ℃/min. In addition, the apparent densification activation energies calculated by MSC are roughly identical to those obtained by Arrhenius method.

Key wordsW-Ni-Fe heavy alloy    SPS    master sintering curve    heating rate    apparent densification activation energy
收稿日期: 2013-11-07     
ZTFLH:  TF12  
基金资助:*教育部支撑计划项目62501036011, 中央高校基本科研业务费项目2012ZG0006, 教育部新世纪优秀人才支持计划项目NCET-10-0364及国家金属材料近净成形工程技术中心开放基金项目2013006资助
作者简介: null

作者简介: 胡可, 男, 1985年生, 博士

图1  均匀混合后的粉末形貌
Element
Purity
%
Particle size μm Mass fraction of main impurity / %
C O P N
W 99.9 2.4~2.6 0.002 0.07 0.0008 -
Ni 99.5 2.2~2.5 ≤0.25 ≤0.11 0.0003 -
Fe 99.5 3.0~5.0 ≤0.10 ≤0.30 - ≤0.10
表1  原始粉末的性能参数
图2  加热速率小于100 ℃/min时93W-5.6Ni-1.4Fe 高比重合金的密度-烧结功(ρ- Θ )曲线
图3  加热速率小于100 ℃/min时表观致密化激活能值与均方根误差的曲线
图4  加热速率小于100 ℃/min时93W-5.6Ni-1.4Fe高比重合金的S型主烧结曲线
图5  加热速率大于100 ℃/min时93W-5.6Ni-1.4Fe高比重合金的ρ-Q曲线
图6  加热速率大于100 ℃/min时 93W-5.6Ni-1.4Fe高比重合金在2个不同烧结阶段的表观致密化激活能值与均方根误差曲线
图7  加热速率大于100 ℃/min时93W-5.6Ni-1.4Fe高比重合金整个烧结过程的表观致密化激活能值与均方根误差的曲线
图8  加热速率大于100 ℃/min时, 93W-5.6Ni-1.4Fe高比重合金整个烧结过程的S型主烧结曲线
图9  93W-5.6Ni-1.4Fe高比重合金放电等离子烧结(SPS)主烧结曲线的验证
图10  93W-5.6Ni-1.4Fe高比重合金SPS过程中加热速率对致密化函数c的影响
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