Properties of Sintering-Boride for Fe-Based Powder Metallurgy Material

Abstract:

The powder compact was directly sintered by a pack boride process to prepare an Fe-based material having a boride layer. The effects of process parameters such as sintering temperature and sintering time on the microstructure and quality of the layer were studied. The thickness of the layer, surface hardness, phase composition and properties of friction and wear were also studied. The results show that the boride layer was mainly composed of Fe₂B, and its thickness is uniform and firmly bonded to the substrate. The thickness and hardness of the layer gradually increase with time and temperature. When the sintering temperature was higher than 1050°C, the more obvious holes and looseness would be appeared in the layer, which was not conducive to improve the properties of material. The thickness of the layer has the best value range with this method. Ensuring the thickness of the layer within a suitable range by controlling the sintering temperature, sintering time and other process parameters was beneficial to reduce the brittleness of the boride layer and improve the friction and wear properties of the material.

• Periodical: Key Engineering Materials (Volume 866)
• Pages: 104-111
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.866.104
• Online since: October 2020
• Authors: Hui Min Fang*, Guang Sheng Zhang, Lian Sen Xia
• Keywords: Fe-Based Materials, Friction, Pack Boride, Thickness, Wear

References

[1] Zhu Yansong, Lu Wenzhuang, Zuo Dunwen, Sun Yuli, Wang Han, Xu Jun, Characteristics of RE-B Surface Diffusion Process on the New Damage Tolerance TC21 Alloy[J], Rare Metal Materials and Engineering, 2014,43(3) :693-697. (In Chinese).

[2] ZHAO Jinghao, LUO Hong, Study on Corrosion Resistance of Ductile Cast Iron with Boride Layer [J], Hot Working Technology, 2014, 43(12):166-180. (In Chinese).

[3] Dong Xianfeng. Study on the Process, Structrues and Properties of Sintering-Boronizing of Fe-based Powder Metallurgy Materials[D]: Chang Chun,(2010).

[4] Yang Zhibing, Research on the Process and Microstructure of Boron Rare Earth Chromium Co-infiltration in 45 Steel[D]: Chang Sha: (2004).

[5] Cimenoglu, H, Atar, E, Motallebzadeh, A. High temperature tribological behavior of borided surfaces based on the phase structure of the boride layer[J]. Wear, 2014,309(1/2): 152–158.

DOI: 10.1016/j.wear.2013.10.012

[6] Sen, S, Sen, U, Bindal,C. Tribological properties of oxidised boride coatings grown on AISI 4140 steel[J]. Materials Letters, 2006,60(29/30): 3481–3486.

DOI: 10.1016/j.matlet.2006.03.036

[7] Kariofillis, H, G,K, Kiourtsidis, G,E, Tsipas,D,N. Corrosion behavior of borided AISI H13 hot work steel[J]. Surface Coatings Technology, 2006,201(1/2):19–24.

DOI: 10.1016/j.surfcoat.2005.10.025

[8] Medvedovski, E, Jiang, J, Robertson, M. Iron boride-based thermal diffusion coatings for tribo-corrosion oil production applications[J]. Ceramics International, 2015,42(2):3190–3211.

DOI: 10.1016/j.ceramint.2015.10.109

[9] A. Pauschitz, M. Roy, F. Franek, Mechanisms of sliding wear of metals and alloys televated temperatures, Tribol. Int. 41 (7) (2008) 584–602.

DOI: 10.1016/j.triboint.2007.10.003