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

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1 Vol.20 No.3 Materials Science and Engineering of Powder Metallurgy Jun WC-11Co 1, 3 1, 3 1, 3 2, 4 2, 4 1 1, 3 1, 3 2, 4 ( ) MMU-10 WC-11Co / 700 N / / 4% 12% / Co WC / TH117.1 A (2015) 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 , China; 2. Zhuzhou Cemented Carbide Group Corp., Ltd., Zhuzhou , China; 3. Key Laboratory of Nonferrous Materials Science and Engineering of Ministry of Education, Central South University, Changsha , China; 4. State Key Laboratory of Cemented Carbide, Zhuzhou , 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) (2011BAE09B BAC03B05) address: yioffice@csu.edu.cn

2 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) [8 9] YG8 0.2 μm WC Co WC BESTE [10 11] WC/Co (WC-11Co) 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 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 # /2 # ( ) [12 13] N /1 # 0.3~0.49 /2 # 0.48~ N

time/min for cemented carbides against 1 # with hardness

under different loads and the same rotational speed (200

granite/cemented carbides 0.35~0.56 0.56~0.7 700 N 0.

86 /2 # 2 [13 14] 100 r/min 200 r/min 300 r/min [15] 2

time/min for cemented carbides against 1 # and 2 #

3 (200 r/min) /1 # /2 # Fig.1 Friction coefficients vs. time/min for cemented carbides against 1 # with hardness of 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~ ~ N 0.37~ ~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.

4 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= a 2= b1= b2= c1= c2= /1 # ΔW=K1F V t (3) /2 # ΔW=K2F V t (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%

5 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

6 20 3 WC-11Co 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 #

7 SEM Fig.6 SEM micrographs of worn surfaces of cemented carbides (a) HV, 300 N, 200 r/min, 120 min; (b) 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

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untitled 20 1 2010 10 Vol.20 Special 1 The Chinese Journal of Nonferrous Metals Oct. 2010 1004-0609(2010)S1-s0127-05 Ti-6Al-4V 1 2 2 (1. 710016 2., 710049) 500~1 000 20 Ti-6Al-4V(TC4) TC4 800 TC4 800 TC4 TC4 800