20 3 2015 6 Vol.20 No.3 Materials Science and Engineering of Powder Metallurgy Jun. 2015 WC-11Co 1, 3 1, 3 1, 3 2, 4 2, 4 1 1, 3 1, 3 2, 4 (1. 410083 2. 412000 3. 410083 4. 412000) MMU-10 WC-11Co / 700 N / / 4% 12% / Co WC / TH117.1 A 1673-0224(2015)3-398-08 Friction and wear performances of WC-11Co cemented carbides sliding against different rocks LI Xiu-lin 1, 3,CHENLi-yong 1, 3,YIDan-qing 1, 3, ZHAO Sheng-zhi 2, 4, ZHANG Zhong-jian 2, 4, ZHENG Xiao-chen 1, WANG Bin 1, 3, LIU Hui-qun 1, 3,PENGYu 2, 4 (1. School of Materials Science and Engineering, Central South University, Changsha 410083, China; 2. Zhuzhou Cemented Carbide Group Corp., Ltd., Zhuzhou 412000, China; 3. Key Laboratory of Nonferrous Materials Science and Engineering of Ministry of Education, Central South University, Changsha 410083, China; 4. State Key Laboratory of Cemented Carbide, Zhuzhou 412000, China) Abstract: The friction and wear properties of WC-11Co cemented carbides against two kinds of granites were evaluated on the MMU-10 pin-on-disk multifunctional friction and wear tester under wet sliding condition, and the morphological analyses of the worn surface were studied by scanning electron microscope. The results show that, under the same friction condition, the friction coefficient of the cemented carbides against granite with higher hardness is lower than those of the cemented carbides against granite with lower hardness. Under the load of 700 N, the mass loss of the cemented carbides against granite with higher hardness is 4% more than that of the cemented carbides against granite with lower hardness; and under the lower load, the mass loss difference of the cemented carbides between the two friction pairs is about 12%, which indicates that rubbing-pair material has relatively decreasing influence on the wear of the cemented carbides. The main wear mechanism of the cemented carbides against granite with higher hardness is the plastic deformation of cobalt binder phase and the removals of some tungsten carbide grains, and scratching mainly occurs in the cemented carbides against granite with lower hardness. (YSZN2013CL01) (2011BAE09B03 2014BAC03B05) 2014-05-26 2014-07-31 0731-88830263 E-mail address: yioffice@csu.edu.cn
20 3 WC-11Co 399 Key words: cemented carbide; friction and wear property; friction coefficient; mass loss WC-Co [1] QUERCIA [2 6] WC-Co WC Co QUIGLEY [2] WC-Co Ha/HWC-Co (Ha HWC-Co ) BESTE [7] WC-Co (20 N) 350 25 [8 9] YG8 0.2 μm WC Co WC BESTE [10 11] WC/Co 1 1.1 (WC-11Co) 14.45 g/cm 3 WC 3 μm 15 mm 5 mm 5 mm 5mm 5 mm 100 # 200 # 400 # 600 # 1120HV 790 HV ( 1 # 1120HV 2 # 790 HV ) 50 mm 50 mm 15 mm 1.2 MMU-10 38 mm ( 0.1 mg) 1 Quanta200 Table 1 Sample No. 1 Parameters for friction and wear test Normal load/n Rotational speed/(r min 1 ) Test time/ min 1 300 200 120 2 500 200 120 3 700 200 120 4 500 100 120 5 500 300 120 6 500 200 240 7 500 200 360 2 2.1 1 2 /1 # /2 # ( ) [12 13] 1 300 N /1 # 0.3~0.49 /2 # 0.48~0.59 500 N
400 2015 6 1 (200 r/min) /1 # /2 # Fig.1 Friction coefficients vs. time/min for cemented carbides against 1 # with hardness of 1 120 HV and 2 # with hardness of 790 HV granite under different loads and the same rotational speed (200 r/min) (a) 1 # granite/cemented carbides; (b) 2 # granite/cemented carbides 0.35~0.56 0.56~0.7 700 N 0.37~0.66 0.61~0.86 /2 # 2 [13 14] 100 r/min 200 r/min 300 r/min [15] 2 (500 N) /1 # /2 # Fig.2 Friction coefficients vs. time/min for cemented carbides against 1 # and 2 # granite under different rotational speeds and the same load (500 N) (a) 1 # granite/cemented carbides; (b) 2 # granite/cemented carbides /2 # 1 # 2 # 2.2 /1 # /2 # 3 /1 #
20 3 WC-11Co 401 4% 12% Rhee [16-17] ( (1)) ΔW=KF a V b t c (1) ΔW K F V t a b c (1) lnδw=alnf+blnv+clnt+lnk (2) 3 (2) a b c 200 r/min 120 min lnδw lnδf a /1 # /2 # lnδw lnf a 1 a 2 a 1=1.077 96 a 2=1.144 84 b1=1.020 7 b2=1.023 22 c1=0.990 59 c2=1.007 07 4 3 /1 # ΔW=K1F 1.07796 V 1.0207 t 0.99059 (3) /2 # ΔW=K2F 1.14484 V 1.02322 t 1.00707 (4) a 1 a 2 b 1 b 2 c 1 c 2 3 a 1 a 2 a 1 a 2 /1 # 3 /1 # /2 # Fig.3 Mass loss of cemented carbides pin-drill against 1 # and 2 # granite vs. different friction conditions (a) 200 r/min, 120 min; (b) 500 N, 120 min; (c) 500 N, 200 r/min 700 N /2 # K 1 K 2(K 1 K 2 ) 1 # 2 # 3(a) 700 N 12% 4%
402 2015 6 4 Fig.4 Relationships for parameters of wear equation (a) lnδw vs. lnf;(b) lnδw vs. lnv; (c) lnδw vs. lnt 2.3 WC-11Co /1 # /2 # SEM 5 WC WC Co 5(a)~(b) /1 # Co WC 3 QUIGLEY [2] 700 N WC Co Co Co WC WC [18 20] WC WC [9, 21] 1 # /1 # WC Co Co WC [22] 6 6(a)~(b) WC/WC WC Co WC 6(c)~(d) 6 7 ( 7(a)) Co ( 7(b)) Co
20 3 WC-11Co 403 5 SEM Fig.5 SEM images of worn surfaces of different samples (a) 1 # 300 N; (b) 1 # 700 N; (c) 2 # 300 N; (d) 2 # 700 N Co WC / [23 25] ( 7(c)) WC WC WC ( 7(d)~(e)) WC/WC WC WC 6 1 # 2 # WC-11Co 3 1) /1 # /2 # /1 # 2) /1 # 3) WC-11Co /1 # Co WC /2 #
404 2015 6 6 SEM Fig.6 SEM micrographs of worn surfaces of cemented carbides (a) 1 120 HV, 300 N, 200 r/min, 120 min; (b) 1 120 HV, 300 N, 200 r/min, 240 min (c) 790 HV, 500 N, 200 r/min, 240 min; (d) 790 HV, 500 N, 200 r/min, 120 min Fig.7 7 WC-11Co Schematic of wear mechanism during sliding test in WC-11Co cemented carbides
20 3 WC-11Co 405 REFERENCES [1] BESTE U, HARTZELL T, ENGQVIST H, et al. Surface damage on cemented carbide rock drill buttons [J]. Wear, 2001, 249(3/4): 324 329. [2] QUIGLEY D G F, LUYCKX S, JAMES M N. An empirical ranking of a wide range of WC-Co grades in terms of their abrasion resistance measured by the ASTM Standard B611-85 Test [J]. International Journal of Refractory Metals and Hard Materials, 1997, 15(1/3): 73 79. [3] QUERCIA G, GRIGORESCU I, CONTRERAS H, et al. Friction and wear behavior of several hard materials [J]. International Journal of Refractory Metals and Hard Materials, 2001, 19(4/6): 359 369. [4],,,. [J]., 2012, 17(4): 437 443. JIN Kuang-hao, CHEN Kang-hua, ZHU Chang-jun, et al. Effects of cemented carbide substrates on tool cutting performance in high-speed machining nickel-based superalloy [J]. Materials Science and Engineering of Powder Metallurgy, 2012, 17(4): 437 443. [5],,. WC [J]., 2010, 6: 9 12. ZHANG Hui, DENG Jian-xin, LI Gui-yu. Effects of WC grain size on friction and wear behavior of WC cemented carbide tool material [J]. Tools & Technology, 2010, 6: 9 12. [6] SAITO H, IWABUCHI A, SHIMIZU T. Effects of Co content and WC grain size on wear of WC cemented carbide [J]. Wear, 2006, 261(2): 119 234. [7] BESTE U, JACOBSON S. Friction between a cemented carbide rock drill button and different rock types [J]. Wear, 2002, 253(11/12): 1219 1221. [8]. [J]., 2012, 9(46): 48 51. KUAI Ji-cai. Friction and wear characteristics of nano-cemented carbide vs marble [J]. Tools & Technology, 2012, 9(46): 48 51. [9]. [J]., 2013, 30: 230 235. KUAI Ji-cai. Friction, wear and cutting performance of nano cemented carbide and rock [J]. Acta Materiae Compositae Sinica, 2013, 30: 230 235. [10] BESTE U, JACOBSON S, HOGMARK S. Rock penetration into cemented carbide drill buttons during rock drilling [J]. Wear, 2008, 264(11/12): 1142 1151. [11] 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(1/2): 168 176. [12] BONNY K, BAETS P D, PEREZ Y, et al. Friction and wear characteristics of WC-Co cemented carbides in dry reciprocating sliding contact [J]. Wear, 2010, 268(11/12): 1504 1517. [13],. [M]. :, 2002: 271 285. WEN Shi-zhu, HUANG Ping. Principles of Tribology [M]. Beijing: Tsinghua University Press, 2002: 271 285. [14],,,. [J]., 2008, 7(18): 1223 1230. FU Rong, SONG Bao-yun, GAO Fei, et al. Effect of friction conditions on friction properties of braking materials used for trains [J]. The Chinese Journal of Nonferrous Metals, 2008, 7(18): 1223 1230. [15],,,. WC-Ni/SiC [J]., 2008, 33(3): 82 85. HUANG Liang, YI Dan-qing, LI Jian, et al. Friction and wear properties of WC-Ni cemented carbide sliding against SiC ceramics on dry condition [J]. Lubrication Engineering, 2008, 33(3): 82 85. [16] RHEE S K. Wear equation for polymers sliding against metal surfaces [J]. Wear, 1970, 16(6): 393 472. [17] RHEE S K. Wear of metal-reinforced phenolic resins [J]. Wear, 1971, 18(6): 471 477. [18],,. [J]., 2009(2): 67 70. KUAI Ji-cai, ZHANG Fei-hu, ZHANG Fa-ming. Friction and wear of nano-cemented carbide [J]. Journal of Northeast Forestry University, 2009(2): 67 70. [19],,,. [J]., 2008(1): 78 82. PAN Yong-zhi, Ai Xing, Zhao Jun, et al. High speed friction and wear behavior of ultra-fine grain cemented carbide [J]. Tribology, 2008, 1(28): 78 82. [20],,. [J]., 2005, 25(1): 83 87. LONG ZHen-hai, WANG Xi-bin, LIU ZHi-bing. Research on wear modes and mechanism of carbide tools in high-speed milling of difficult-to-cut materials [J]. Tribology, 2005, 25(1): 83 87. [21] SUH N P, SIN H C. The genesis of friction [J]. Wear, 1981, 69(1): 91 114. [22] BESTE U, JACOBSON S. A new view of the deterioration and wear of WC/Co cemented carbide rock drill buttons [J]. Wear, 2008, 264(11/12): 1129 1141. [23] PIRSO J, LETUNOVITS S, VILJUS M. Friction and wear behaviour of cemented carbides [J]. Wear, 2004, 257(3/4): 257 265. [24] LARSEN B J. Binder extrusion in sliding wear of WC-Co alloys [J]. Wear, 1985, 105(3): 247 256. [25] ENQVIST H, HOGBERG H, BOTTON G A, et al. Tribofilm formation on cemented carbides in dry sliding conformal contact [J]. Wear, 2000, 239(2): 219 228. ( )