Spark Sintering Behavior of Ubiquitously Fe-B and Fe Powders and Characterization of Their Hard Composites

Kang, Shaoming; Xu, Zhefeng; Choi, Yongbum; Fujita, Kenji; Matsugi, Kazuhiro; Yu, Jingkun

doi:10.2320/matertrans.mc201506

Cited by 4 publications

(3 citation statements)

References 25 publications

(30 reference statements)

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“…4. FeB-10Fe showed improved sintering behavior as compared to FeB-0Ni, which corresponded to the promotion of densi cation by the deformation of Fe binders 29) as well as Ni binders. The FeB-10Ni 30) compact showed an apparent relative density of 0.8 at 1190 K, in the region of high temperatures above 1000 K. In contrast, the FeB-10Fe compact showed an apparent relative density of 0.8 at 1260 K. The addition of Ni therefore resulted in the improvement of sinter-ability achieving the same density level at a temperature 70 K lower.…”

Section: Comparison Of the Effects Of Ni And Fe Binders Onmentioning

confidence: 99%

“…consolidation and properties of respective compacts Sintering and mechanical characteristics are compared in Table 2 between FeB-25Ni and FeB-10Fe 29) sintered at 1373 and 1505 K, respectively, in which the solid-state processing parameters were optimized. The sintering curve of FeB-10Fe, a mixture of both of FeB and pure Fe powders, was also shown in Fig.…”

Section: Comparison Of the Effects Of Ni And Fe Binders Onmentioning

confidence: 99%

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Consolidation Behaviors of FeB–25Ni Powders in Spark Sintering and Mechanical Properties of Their Compacts

Kang

Choi

et al. 2016

Mater. Trans.

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Section: Comparison Of the Effects Of Ni And Fe Binders Onmentioning

confidence: 99%

Section: Comparison Of the Effects Of Ni And Fe Binders Onmentioning

confidence: 99%

Consolidation Behaviors of FeB–25Ni Powders in Spark Sintering and Mechanical Properties of Their Compacts

Kang

Choi

et al. 2016

Mater. Trans.

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“…It was reported that plastic deformation of the compacts occurred before reaching maximum point of the Ḋ. After that power law creep deformation of compacts occurred using pure copper, pure Ti and Al 2 O 3 added copper powders [15][16][17][18][19] .…”

Section: Preparation Of Feb-ni Hard Materials By Both Electroless Plamentioning

confidence: 99%

Preparation of FeB-Ni Hard Materials by Both Electroless Plating and Spark Sintering, and Their Mechanical Properties

Kang

Fujita

et al. 2016

J. Jpn. Soc. Powder Powder Metallurgy

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FeB-Ni hard materials were consolidated by both electroless plating and spark sintering processes for the development of ubiquitous hard materials. Uniform nickel layers were formed quantitatively on as-received FeB powder surfaces. The amorphous Ni layers transformed to poly-crystalline during spark sintering. Sintering curves of FeB-Ni compacts showed the similar behaviors regardless of Ni contents, although their apparent relative densities were increased with the increment of Ni contents. Moreover, the sintering mechanism of FeB-Ni and pure Ni compacts consisting of both the plastic deformation and power law creep deformation occurred during spark sintering. Their maximum points of Ḋ were shown in the D of approximately 0.78. The plastic and power law creep deformation were predominantly consolidation mechanisms before and after maximum Ḋ, respectively. Values in H R A of FeB-Ni compacts were decreased with increment of the Ni contents. The compressive stress of FeB-Ni compacts was decreased with the increment of the Ni contents in contrast to the compressive strain.

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Synthesis of 30 vol%TiB<sub>2</sub> Containing Fe–5Ti Matrix Composites with High Thermal Conductivity and Hardness

Matsugi

et al. 2019

Mater. Trans.

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TiB 2 doped Fe system alloys composites as a new generation of novel materials in sustainable society show the great potential in hot work tool steels usage. Compared with SKD61, the new generation materials are focused on improving both thermal conductivity and hardness. For the suppression of TiB 2 decomposition and Fe 2 B formation, monophase BCC structured Fe5Ti alloy powders were fabricated by mechanical allying method. The TiB 2 addition with 30 vol% was selected for the control of hardness. The compacts sintered at 1323 and 1373 K for 0.6 ks consisted of ¡-Fe and TiB 2 with almost 30 vol%, which meant no decomposition of TiB 2 occurred during sintering. The result agreed with the achievement of thermal stability of TiB 2 in Fe5Ti during spark sintering synthesis. The thermal conductivity and Vickers hardness of compacts sintered at 1323 and 1373 K for 0.6 ks were 48.0 W/(m•K), 684.7 HV and 53.5 W/(m•K), 717.5 HV, respectively, which were 2.0, 1.3 and 2.2, 1.4 folds than those (24.0 W/(m•K), 516.0 HV) of SKD61. In addition, the compression strength of two compacts sintered at 1323 and 1373 K were measured to be 1698 and 2591 MPa, respectively. The compact sintered at higher temperature showed better mechanical properties and higher thermal conductivity due to the improvement of densification and interface bonding between Fe5Ti and TiB 2 as proved by the fracture modes in compression tests and the crack propagations in hardness tests. Hence, this work provides a new method for fabricating Fe 2 B free FeTiB 2 composites by powder metallurgy with both improvement of thermal conductivity and hardness in the usage of hot work tool steels.

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Spark Sintering Behavior of Ubiquitously Fe-B and Fe Powders and Characterization of Their Hard Composites

Cited by 4 publications

References 25 publications

Consolidation Behaviors of FeB–25Ni Powders in Spark Sintering and Mechanical Properties of Their Compacts

Consolidation Behaviors of FeB–25Ni Powders in Spark Sintering and Mechanical Properties of Their Compacts

Preparation of FeB-Ni Hard Materials by Both Electroless Plating and Spark Sintering, and Their Mechanical Properties

Synthesis of 30 vol%TiB<sub>2</sub> Containing Fe–5Ti Matrix Composites with High Thermal Conductivity and Hardness

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