High magnetic performance of metal injection-molded pure iron using δ phase sintering

Tian, Lusha; Qin, Mingli; Ma, Jiawei; Zhang, Lin; Zhang, Xiaofeng

doi:10.1016/j.matlet.2014.01.116

Cited by 10 publications

(8 citation statements)

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“…It has been realized that using MIM technology, pure iron magnetic performance can be improved. 63,66) Tasovac et al 67) investigated carbonyl iron parts using MIM to study the magnetic properties for different sintering conditions, 75% H 2 + 25% N 2 mixed atmosphere sintering. He noted that the sintered density of the material has been improved, however N, O impurities are higher.…”

Section: Magnetic Materialsmentioning

confidence: 99%

“…He noted that the sintered density of the material has been improved, however N, O impurities are higher. 67) Many researchers 66,68) has demonstrated with their comprehensive studies using MIM process that in pure soft magnetic iron with the increasing temperature from 900 to 1 350°C followed by sufficient soaking time at 1 350°C, high-density sintered body can be gained. Further it is also confirmed that the heat treatment results in favorable of microstructure homogenization and distribution of the pores of the sintered body.…”

Section: Magnetic Materialsmentioning

confidence: 99%

“…58) Company Grade D50 (μm) AD (g/cm 3 ) Tap Density (g/cm 3 ) Femin (%) Cmax (%) Omax (%) Nmax (%) density from 1 200-1 450°C with increase in temperature. Tian et al 66) showed that the using carbonyl iron powder in MIM process, sintered density has improved significantly (above 1 393°C) using δ phase sintering. As seen from Fig.…”

Section: Magnetic Materialsmentioning

confidence: 99%

“…MIM carbonyl iron resulted to full density after sintering at 1 450°C with a maximum permeability of 17 400, B 6 000 of 1.81 T and coercive force of 20.6 A/m. It is postulated 63,66) from the Fe-C phase diagram that pure iron present in the form of δ phase (more than 1 394°C) promote sintering. Hence, sintering made above this temperature is called "δ phase sintering".…”

Section: Magnetic Materialsmentioning

confidence: 99%

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Opportunity and Challenges of Iron Powders for Metal Injection Molding

et al. 2021

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Design flexibility, mass customization, waste reduction and the ability to manufacture near-net complexshape structures, as well as rapid prototyping, are the main advantages of Metal Injection Molding (MIM). A brief review of the MIM technique, materials and their development to trending applications using iron powders was delineated. The ground-breaking applications of MIM in automotive, medical, and magnetic materials were discussed. The current-status of iron powder product development prepared for MIM was reviewed. In addition, this paper discussed the main processing challenges considering the MIM technology for producing high-end applications. Overall, this paper gives a summary of MIM, including a study on its benefits and opportunities and as a roadmap for future research and development in iron and steel powder manufacturing technique. KEY WORDS: metal injection molding; iron powders; mass customization; microstructure. ders such as copper, molybdenum, chromium, and nickel. 6) Currently, estimate share of MIM in metal powder industry is minimal, close to 6 000 TPA for iron powders (excluding stainless steel and high alloy steels). 7) The demand is Table 1. Global pure iron powder production (in MT) of key manufacturers in 2017 (Source: QYR Chemical & Material Research Centre, April 2017).

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Section: Magnetic Materialsmentioning

confidence: 99%

Section: Magnetic Materialsmentioning

confidence: 99%

Section: Magnetic Materialsmentioning

confidence: 99%

Section: Magnetic Materialsmentioning

confidence: 99%

See 2 more Smart Citations

Opportunity and Challenges of Iron Powders for Metal Injection Molding

et al. 2021

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“…When the pure iron is sintered at 1400 • C, its structure is transformed into δ-phase with a BCC (body-centered cubic) structure, which has a lower atomic packing density than FCC (face-centered cubic) γ-phase, therefore resulting in an improved self-diffusivity and higher sintered density. A relative density of 99.8% and good magnetic properties are obtained from pure iron by the use of this method [19].…”

Section: Introductionmentioning

confidence: 99%

Effects of Fe3P Addition on Sintering Behaviors and Magnetic Properties of Fe-P Alloys Sintered at Low Temperatures

Liu

et al. 2019

Metals

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In this paper, we demonstrate that trace amounts of P addition can activate the sintering of carbonyl powder and influence the magnetic properties of the sintered materials. Fe-x P (x = 0, 0.6, 0.8, 1.0, 1.2, 1.4, and 1.6 wt.%) samples were fabricated by doping carbonyl powder with different amounts of Fe3P. They were sintered at 1000 °C in argon for 2 h. The sintering of the Fe-0 wt.% P sample was interrupted by the ferrite-austenite transformation at 912 °C due to the low diffusion rate of the austenite. The addition of P can stabilize the ferrite, and suppress the ferrite-austenite transformation. Therefore, all the P-containing samples shrank continuously throughout the whole sintering process, which showed improved sintering densities compared to the P-free sample. However, the sintering density did not increase monotonously with increasing P content. The Fe-1.4 wt.% P and Fe-1.6wt.% P samples easily got oxidized during sintering, and the densification process was thus influenced by the P-containing oxide particles. As a result, the Fe-1.2 wt.% P sample exhibited the highest sintering density (7.664 g/cm3) and the best magnetic properties (coercive force 172 A/m).

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