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Yang J.,Hoganas AB | Wang J.,Hoganas AB | Niu S.,Hoganas AB | Zou M.,Hoganas 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. Source


Zhao R.,NBTM New Materials Group Co.
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. Source


Yang J.,Hoganas AB | Wang J.,Hoganas AB | Han Y.,Hoganas AB | Niu S.,Hoganas 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. Source


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

Products of powder metallurgy.


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. Source

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