The effect of micro-porous structure on the friction property of low-cobalt coarse-grained WC cemented carbides
HUANG Li-rong1,2, CHEN Yu-hang1, WANG Xiao-lei2
（1.School of Mechanical and Electrical Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, Jiangxi,China 2.College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics & Astronautics Jiangsu Key Laboratory of Precision and Micro-Manufacturing Technology, Nanjing 210016, Jiangsu, China
Abstract：The preparation process of cemented carbides is the liquid phase sintering process, in which the essence is the process of densification, so density is an important indicator of detection. In recent years, the surfaces of cemented carbides have been textured. It is found that a certain non-smooth surface has better wear resistance and wetting property than the smooth one. The friction property was evaluated by using a ball-on-disk tribometer. The upper sample is a ball which is made of GCr15, 304 stainless steel, SiC, or Si3N4. The lower sample is a disc made of dense or porous WC cemented carbides. The experimental results show that the micro-porous structure has a great effect on the friction coefficient of GCr15 ball / WC cemented carbide disc. The micro-porous structure can obviously reduce the friction coefficient. The friction coefficient changes slowly but finally stabilizes in the vicinity of 0.4. However, the friction coefficient of the dense cemented carbide is larger and is fluctuated between the value of 0.5~0.6. There is a little effect on the friction coefficient of SiC ball / WC cemented carbide disc. The friction coefficient of micro-porous structure is lower than the dense one, but the effect is not obvious. There was no role on the friction coefficient of Si3N4 ball / WC cemented carbide disc. On the contrary, the friction coefficient of 304 stainless steel ball / WC cemented carbide disc increases.
“China Tungsten Industry Report, 2014-2017” http://www.prnewswire.com/news-releases/china-tungsten-industry-report-2014-2017-274802951.html
[2]
JUHR H, SCHULZE HP, WOLLENBERG G, KüNANZ K. Improved cemented carbide properties after wire-EDM by pulse shaping [J], Journal of Materials Processing Technology, 2004, 149(3): 178-183.
[3]
GEE MG, GANT A, ROEBUCK B. Wear mechanisms in abrasion and erosion of WC/Co and related hard metals [J], Wear, 2007, 263(6): 137-148.
[4]
SHAO GQ, DUAN XL, XIE JR, etc.. Sintering of nanocrystalline WC-Co composite powder[J], Reviews on Advanced Materials Science,2003,5 (4) :281–286.
[5]
BESTE U, CORONEL E, JACOBSON S. Wear induced material modifications of cemented carbide rock drill buttons [J]. International Journal of Refractory Metals & Hard Materials, 2006, 24: 168-176.
[6]
BESTE U, JACOBSON S. A New view of the deterioration and wear of WC/Co cemented carbide rock drill buttons [J]. Wear, 2008, 264: 1129-1141.
[7]
BESTE U, JACOBSON S, HOGMARK S. Rock penetration into cemented carbide drill buttons during rock drilling [J]. Wear, 2008, 264: 1142-1151.
[8]
CASAS B, TORRES Y, LLANES L. Fracture and fatigue behavior of electrical-discharge machined cemented carbides [J], International Journal of Refractory Metals & Hard Materials,2006,24 (2):162-167.
[9]
LLANES L, TORRES Y, ANGLADA M. On the fatigue crack growth behavior of WC-Co cemented carbides: kinetics description, micro-structural effects and fatigue sensitivity [J], Acta Materialia, 2002, 50 (9): 2381-2393.
[10]
MONTIMER B, LANCASTER JK, Extending the life of aerospace dry bearings by the use of hard smooth counterfaces [J]. Wear, 1988, 121 (3): 289-305.
[11]
ENGQVIST H, BOTTON GA, EDERYD S, etc.. Wear phenomena on WC-based face seal rings [J], International Journal of Refractory Metals & Hard Materials, 2000, 18(1): 39-46.
MASUDA M, KUROSHIMA Y, CHUJO Y. Failure of tungsten carbide-cobalt alloy tools in machining of carbon materials [J]. Wear, 1984, 94: 89-97.
[17]
PIRSO J, LETUNOVES S, VILJUS M. Friction and wear behavior of cemented carbides [J]. Wear, 2004, 257: 257-265.
[18]
O'QUIGLEY DGF, LUYCKX S, JAMES MN. An empirical ranking of a wide range of WC-Co grades in terms of their abrasion resistance measured by the ASTM standard B 611 -85 test [J]. International Journal of Refractory Metals & Hard Materials, 1997, 15: 73-79.
[19]
KESHAVAN MK. Coarse Carbides Substrate Cutting Elements and Method of Forming the Same. US Patent: 7017677 B2 [P]. 2006-03-28.
[20]
LIANG DB. Fracture and Wear Resistant Compounds and Rock Bits. US Patent: 7036614 B2 [P]. 2006-05-02.
BUNDSCHUH W, ZUM GAHR KH. Effect of temperature on friction and oscillating sliding wear of dense and porous 3Y-TZP zirconia ceramics [J]. Trib. Int., 1994, 27: 97-104.
2016, Vol. 23 
