Spark Sintering Behavior of Ubiquitously Fe-B and Fe Powders and Characterization of Their Hard Composites
Spark Sintering Behavior of Ubiquitously Fe-B and Fe Powders and Characterization of Their Hard Composites
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DOI：
10.2320/matertrans.mc201506
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发表时间：
2016-05
影响因子：
1.2
通讯作者：
Shaoming Kang;Zhefeng Xu;Yongbum Choi;K. Fujita;K. Matsugi;Jinku Yu
中科院分区：
文献类型：
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作者：
Shaoming Kang;Zhefeng Xu;Yongbum Choi;K. Fujita;K. Matsugi;Jinku Yu
为开发WC-Co合金的代用材料，研究了添加10μm的FeB粉末(以下简称FeB-10Fe)的放电烧结行为。FeB-10Fe的最高温度在1493-1523K之间变化，但在600K-1493K范围内的放电烧结行为在烧结曲线上是相同的。实验还得到了FeB-10Fe和纯铁的致密化速率Ḋ，Ḋ的最大值出现在约0.75K处。FeB-10Fe压坯中Fe粘结相的塑性变形发生在Ḋ最大点之前，而蠕变相则发生在其达到最大值之后。在1493~1523K温度范围内，FeB-10Fe压坯的表观相对密度随烧结温度的升高而增加，而在1505 K和1523K下，FeB-10Fe压坯的平均密度随着烧结温度的升高而降低，这是由于FeB-10Fe压坯的气孔率增加导致FeB-10Fe压坯的洛氏硬度随着烧结温度的升高而降低，这是因为在1505K和1523K下，FeB-10Fe压坯与液相FeB之间的润湿性较差。相反，由于颗粒间原子扩散的促进，颗粒间界面的显微硬度随烧结温度的升高而增大。在最高温度下烧结的压坯具有最大的压应力和压应变，这也是由于促进了晶界的烧结。[DOI：10.2320/MATERTRA.MC201506]
Spark sintering behaviors of 10 vol% Fe added FeB powders with 10 μm size (here after called FeB-10Fe) were investigated in spark sintering process for the development of alternative materials of WC-Co alloys. Spark sintering behaviors of FeB-10Fe in the temperature range of 600 to 1493 K were the same in the sintering curves although their maximum temperatures changed from 1493 to 1523 K. The densi cation rates, Ḋ, of FeB-10Fe and pure Fe were also obtained experimentally, and the maximum point of Ḋ was shown at the D of approximately 0.75. The plastic deformation and power law creep deformation of Fe binder phase in FeB-10Fe compacts occurred before and after reaching maximum point of Ḋ, respectively. The sinterability was improved by 10 vol% Fe addition, and apparent relative density of FeB-10Fe compacts was increased with the increment of the sintering temperature of 1493 K to 1523 K. In contrast, the mean density of FeB-10Fe compacts was decreased with the increment of sintering temperature because of the poor wettability between liquid phase (Fe and Fe2B) and FeB phase in the liquid phase state at 1505 K and 1523 K. The values of Rockwell hardness of FeB-10Fe compacts were decreased with increment of sintering temperature because of the increment of porosities in FeB-10Fe compacts. In contrast, the values of micro hardness on the interfaces between grains were increased with increment of sintering temperature, because of the promotion of atomic diffusion between particles. There were maximum value of compressive-stress and -strain on compacts sintered at highest temperature, also because of promotion of the sintering in the interface between grains. [doi:10.2320/matertrans.MC201506]