Fabrication and Performance Characterization of Cu-10Sn-xNi Alloy for Diamond Tools

doi:10.11900/0412.1961.2019.00282

Acta Metall Sin

2020, Vol. 56

Issue (5): 760-768 DOI: 10.11900/0412.1961.2019.00282

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Fabrication and Performance Characterization of Cu-10Sn-xNi Alloy for Diamond Tools

LIU Zhenpeng¹^,², YAN Zhiqiao², CHEN Feng²(

), WANG Shuncheng², LONG Ying³, WU Yixiong⁴

1.School of Materials Science and Engineering, Central South University, Changsha 410083, China
2.Guangdong Institute of Materials and Processing, Guangzhou 510650, China
3.School of Electromechanical Engineering, Guangdong University of Technology, Guangzhou 510006, China
4.Guangzhou Crystal Technology Co. , Ltd, Guangzhou 510520, China

Cite this article:

LIU Zhenpeng, YAN Zhiqiao, CHEN Feng, WANG Shuncheng, LONG Ying, WU Yixiong. Fabrication and Performance Characterization of Cu-10Sn-xNi Alloy for Diamond Tools. Acta Metall Sin, 2020, 56(5): 760-768.

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Abstract

Diamond tools are widely used in industry. Co is considered as the best matrix for the diamond tools due to its excellent retention of diamond grits and flexible control of wear resistance. But its application is suppressed because of its high price. The rapidly increasing contribution of matrices to tool production costs continues to encourage researchers to find and implement cheaper alternatives. Cu-based alloys are ideal materials to replace Co used as diamond tool matrices because of their low sintering temperature, good formability and low price. However, Cu-based matrices can not effectively hold the diamonds due to their low mechanical strength and small elastic modulus, so the service life and processing efficiency of Cu-based diamond tools are difficult to be satisfied. In this work, four kinds of Cu-10Sn-xNi pre-alloyed powders with different Ni contents (x=15, 30, 45 and 60, mass fraction, %) were prepared by ball milling. Bulk samples were fabricated from the pre-alloyed powders by hot pressing sintering at 820, 850 and 880 ℃, respectively. The microstructures and mechanical properties of pre-alloyed powders and bulks were characterized and tested. The results show that Cu_3.8Ni phase is detected in the pre-alloyed powders prepared by ball milling. For the powder with 60%Ni, Ni₃Sn phase and amorphous phase are detected. With increasing the Ni content as well as the sintering temperature, the segregation of Sn element in sintered alloys is effectively suppressed and the microstructure becomes homogeneous significantly, and the density, flexural strength and flexural modulus of the alloys are correspondingly improved. However, increasing the Ni content has little effect on the hardness of the alloys. The Cu-10Sn-60Ni alloy prepared by hot pressing at 880 ℃ has the best comprehensive performance. Its hardness, flexural strength and flexural modulus are 100 HRB, 1308 MPa and 75.6 GPa, respectively.

Key words: diamond tool Cu-Sn-Ni alloy microstructure flexural strength flexural modulus

Received: 26 August 2019

ZTFLH:

TG74

Fund: Guangdong Public Welfare Research and Capacity Building Project(2017A070701029);Guangzhou Foreign Science and Technology Cooperation Special Project(201907010022);Guangzhou Science and Technology Project(201906040007)

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	Zhenpeng LIU
	Zhiqiao YAN
	Feng CHEN
	Shuncheng WANG
	Ying LONG
	Yixiong WU

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https://www.ams.org.cn/EN/10.11900/0412.1961.2019.00282 OR https://www.ams.org.cn/EN/Y2020/V56/I5/760

Table 1 Components of Cu-10Sn-xNi mixed powders

Fig.1 SEM images of Cu-10Sn-xNi pre-alloyed powers
(a) x=15 (b) x=30 (c) x=45 (d) x=60

Fig.2 Elemental distribution maps of Cu-10Sn-xNi pre-alloyed powders
Color online
(a) x=15 (b) x=30 (c) x=45 (d) x=60

Fig.3 XRD spectra of Cu-10Sn-xNi pre-alloyed powders

Fig.4 BSE images of hot pressing sintering Cu-10Sn-xNi alloys with x=15 (a1~a3) , x=30 (b1~b3) , x=45 (c1~c3) and x=60 (d1~d3) at temperatures of 820 ℃ (a1~d1) , 850 ℃ (a2~d2) and 880 ℃ (a3~d3)

Table 2 EDS results of points in Fig.4a1

Fig.5 The second phases in hot pressing sintering Cu-10Sn-60Ni alloy at 880 ℃

Fig.6 Effects of Ni content and sintering temperature on density (a) and hardness (b) of Cu-10Sn-xNi alloys

Fig.7 Effects of Ni content and sintering temperature on flexural strength (a) and flexural modulus (b) of Cu-10Sn-xNi alloys

Fig.8 Flexural fracture morphologies of hot pressing sintering Cu-10Sn-xNi alloy at 880 ℃
(a) x=15 (b) x=30 (c) x=45 (d) x=60

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