NBTM New Materials Group Co.

Ningbo, China

NBTM New Materials Group Co.

Ningbo, China
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Peng Y.,Central South University | Peng Y.,NBTM New Materials Group Co. | Ma J.,NBTM New Materials Group Co. | Zhang W.,NBTM New Materials Group Co. | And 3 more authors.
Advanced Materials Research | Year: 2013

In this paper, the Fe-9Si-6Al soft magnetic composite has been prepared via powder particles coated with aluminum oxide and silicone. The magnetic properties and microstructure of Fe-Si-Al SMC has been investigated. Results showed that the powder particles surface contained a thin insulating layer made of aluminum oxide and silicone. After annealed at 800°C for 60min, the particles of component are all by themselves and the insulating layer is not destroyed. The Fe-Si-Al SMC has excellent magnetic properties. The magnetic permeability is steady with the frequency changing at 5kHz-100kHz range. © (2013) Trans Tech Publications, Switzerland.


Zhao R.,NBTM New Materials Group Ltd Company
Fenmo Yejin Jishu/Powder Metallurgy Technology | Year: 2012

Revising the tooth profile of the female die of an involute gear is often needed in P/M industry. It is very difficult to correct the tooth profile by the software of a slow-feeding wire-cut machine. The tooth profile of an involute gear can be drawn precisely by using the software of EXCEL and AUTOCAD according to the forming principles of the involute. It is more intuitional, convenient and effective to modify the tooth profile.


Peng Y.,Central South University | Yi Y.,Central South University | Li L.,Central South University | Yi J.,Central South University | And 2 more authors.
Materials and Design | Year: 2016

The alumina sol was obtained using Al(C3H7O)3 as a precursor. Pure Fe particles were coated with Al2O3 using a sol–gel method and subsequently calcinated at 1100 °C. The resulting soft magnetic composites were investigated while varying the treating temperature. Scanning electron microscopy (SEM), energy-dispersive spectroscopy (EDS), X-ray diffraction (XRD), and Fourier transform infrared spectroscopy (FTIR) analyses revealed that the surface of the Fe powder particles comprised a thin α-Al2O3 insulating layer uniformly distributed after calcination at 1100 °C for 1 h. The permeability increased with the treating temperature, reaching a stable value of 93 from 675 °C to 725 °C. The hysteresis losses decreased, whereas the eddy losses increased with the treating temperature in the range of 650–725 °C. The core losses (Pcv) decreased (lowest value: 10.2 kW/m3) up to 675 °C and increased thereafter. The permeability of the material annealed at 675 °C remained stable with changes in the frequency, whereas Pcv remained low over the 5–100 kHz range. A noticeable insulation layer separating the different Fe particles was observed by SEM for the samples annealed below 700 °C. © 2016 Elsevier Ltd


Peng Y.,Central South University | Peng Y.,NBTM New Materials Group Co. | Nie J.,NBTM New Materials Group Co. | Zhang W.,NBTM New Materials Group Co. | And 3 more authors.
Journal of Magnetism and Magnetic Materials | Year: 2015

Abstract Soft magnetic composites (SMCs) of Fe particles coated with fine particle Ni0.5Zn0.5Fe2O4 ferrite were prepared via microwave heat treatment, and the magnetic properties and microstructures of these composites were investigated. The results show that a well-distributed Ni0.5Zn0.5Fe2O4 coating layer was formed on the surface of the Fe particles upon microwave annealing. The SMCs sample treated by microwave heating at 800°C for 30 min under N2 had a perfect insulation layer between the Fe particles and showed stable permeability and low core loss as well as good magnetic characteristics over a wide frequency range. © 2015 Elsevier B.V.


Yang J.,Höganäs AB | Wang J.,Höganäs AB | Niu S.,Höganäs AB | Zou M.,Höganäs AB | And 2 more authors.
Fenmo Yejin Jishu/Powder Metallurgy Technology | Year: 2015

Sinter-hardening of PM components is an established cost-effective process to produce high strength parts. However, controlling dimensional tolerances is also an important objective while producing sinter-hardening components as machining afterwards is relatively difficult and expensive. This study is focusing on a comparative study of various sinter-hardening PM steels which are available on the market. Test specimens at the same compaction pressure and an actual PM component at the same density were studied in terms of strength, ductility and dimensional consistency. The study shows all the materials are effectively sinter hardened and good dimensional consistency is achieved under the industrial condition. CrM as prealloyed and no copper added is the most cost effective material. Thanks to its high hardenability it achieves the highest dimensional consistency and robustness with 0.5%C added at the industrial cooling rate. ©, 2015, Beijing Research Institute of Powder Metallurgy. All right reserved.


He L.,NBTM New Materials Group Company Ltd | Tong Y.,NBTM New Materials Group Company Ltd | Mao Z.,NBTM New Materials Group Company Ltd | Bao C.,NBTM New Materials Group Company Ltd
Fenmo Yejin Jishu/Powder Metallurgy Technology | Year: 2011

The weldability of ferrous PM parts is related to material composition, processes of welding and porosity etc. Based upon practice experience of manufacturing and studying joining and welding of ferrous PM parts, the features and applications of methods of joining and welding of ferrous PM part are analyzed and evaluated, including arc welding, resistant projection welding, brazing, laser welding, friction welding and sinter-joining in NBTM. It is pointed out that new techniques improve the weldability of ferrous PM parts. Better weldability can expand application domain of ferrous PM parts, and enhance PM competitive advantages.


Yang J.,Höganäs AB | Wang J.,Höganäs AB | Han Y.,Höganäs AB | Niu S.,Höganäs AB | And 3 more authors.
Advances in Powder Metallurgy and Particulate Materials - 2014, Proceedings of the 2014 World Congress on Powder Metallurgy and Particulate Materials, PM 2014 | Year: 2014

Sinter-hardening of PM components is an established cost-effective process to produce high strength parts. However, controlling dimensional tolerances is also an important objective while producing sinterhardening components as machining afterwards is relatively difficult and expensive. This study is focusing on a comparative study of various sinter-hardening PM steels and how they perform in terms of strength, ductility and dimensional consistency. PM steels alloyed with different alloying elements based on MPIF standard are compared and the respective performance profiles are presented.


Yuandong P.,Central South University | Yuandong P.,NBTM New Materials Group Co. | Zhiyue S.,NBTM New Materials Group Co. | Junwu N.,NBTM New Materials Group Co. | And 3 more authors.
Advances in Information Sciences and Service Sciences | Year: 2012

In this paper, we have investigated the effect of annealing treatment processing on the permeability, hysteresis loss, eddy loss and coercity of iron soft magnetic composites. The results show that higher annealing temperature increases eddy loss, and decreases coercivity and hysteresis loss. The permeability and core loss of sample annealed at 650°C are more excellent. SEM, EDX analysis, and element distribution maps show that the powder particles surface layer contains a thin insulating layer made of silicone and aluminum oxide with uniform surface coverage. The sample annealed at 650°C has good magnetic characteristics in a wide range of frequencies.


Peng Y.,Central South University | Peng Y.,NBTM New Materials Group Co. | Nie J.,NBTM New Materials Group Co. | Zhang W.,NBTM New Materials Group Co. | And 3 more authors.
Journal of Magnetism and Magnetic Materials | Year: 2016

We investigated the effect of the addition of Al2O3 nanoparticles on the permeability and core loss of Fe soft magnetic composites coated with silicone. Fourier transform infra-red spectroscopy, scanning electron microscopy and energy-dispersive X-ray spectroscopy analysis revealed that the surface layer of the powder particles consisted of a thin insulating Al2O3 layer with uniform surface coverage. The permeability and core loss of the composite with the Al2O3 addition annealed at 650°C were excellent. The results indicated that the Al2O3 nanoparticle addition increases the permeability stablility with changing frequency and decreases the core loss over a wide range of frequencies. © 2015 Elsevier B.V. All rights reserved.


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Nbtm New Materials Group Co. | Date: 2010-03-15

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