SHORT-TERM PROCESS OF RECYCLING CEMENTED CARBIDE SCRAPS AND PREPARATION OF HIGH PERFORMANCE HARD METALS

doi:10.3724/SP.J.1037.2013.00585

Acta Metall Sin

2014, Vol. 50

Issue (5): 633-640 DOI: 10.3724/SP.J.1037.2013.00585

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SHORT-TERM PROCESS OF RECYCLING CEMENTED CARBIDE SCRAPS AND PREPARATION OF HIGH PERFORMANCE HARD METALS

WANG Yao, LIU Xuemei, SONG Xiaoyan(

), WEI Chongbin, WANG Haibin, WANG Xilong

Key Laboratory of Advanced Functional Materials, College of Materials Science and Engineering, Beijing University of Technology, Beijing 100124

Cite this article:

WANG Yao, LIU Xuemei, SONG Xiaoyan, WEI Chongbin, WANG Haibin, WANG Xilong. SHORT-TERM PROCESS OF RECYCLING CEMENTED CARBIDE SCRAPS AND PREPARATION OF HIGH PERFORMANCE HARD METALS. Acta Metall Sin, 2014, 50(5): 633-640.

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Abstract

Recycling of cemented carbide scraps is drawing more and more attention to companies and countries all over the world. However, the recycling method has always been a problem where there are many factors involved. The feasibility, recycling rate, energy consumption and the environment conservation are all significant factors for the recycling method that need to be considered. In this work, using the cemented carbides scraps as the raw material, the recycled WC-16%Co (mass fraction) composite powder was synthesized by oxidation, reduction and carbonization reactions. Then the recycled composite powder was sintered to prepare the hard metal bulks by sinter-HIP (hot isostatic pressing). The results indicate that with the carbon addition increases, the content of Co₆W₆C in the composite powders decreases while the total carbon and free carbon increase. When the carbon addition is 16.60%, the high-performance hard metal bulks can be obtained, with a fracture toughness of 23.05 MPa·m^1/2 and a transverse rupture strength of 4020 MPa. Moreover, the Co phase distributes more homogeneously in the recycled hard metals. The larger mean free path of the Co phase and the lower contiguity degree of the WC grains lead to the high performance of the recycled hard metal materials.

Key words: recycling of the cemented carbides scrap carbon addition WC-Co composite powder mechanical property

ZTFLH:

TG146

Fund: National High Technology Research and Development Program of China (No.SS2013AA031401), National Natural Science Foundation of China (No.51174009),Natural Science Foundation of Beijing (Nos.2131001 and 2133062) and Fund of State Key Laboratory of New Metal Materials (No.2012-Z08)

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王瑶, 男, 1988年生, 硕士生

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	Yao WANG
	Xuemei LIU
	Xiaoyan SONG
	Chongbin WEI
	Haibin WANG
	Xilong WANG

URL:

https://www.ams.org.cn/EN/10.3724/SP.J.1037.2013.00585 OR https://www.ams.org.cn/EN/Y2014/V50/I5/633

Fig.1

废旧WC-16%Co硬质合金氧化后所得粉末的SEM像和XRD谱

Fig.2

WO₃和CoWO₄与C发生原位还原碳化反应的热力学计算结果

Fig.3

不同配C量下再生复合粉的XRD谱

Fig.4

不同配C量下再生复合粉制备的再生硬质合金块体的XRD谱

表1 不同配C量时合成的再生WC-16%Co复合粉中各元素含量

Fig.5

不同配C量下再生复合粉制备的再生硬质合金块体的OM像

Fig.6

不同配C量下再生复合粉制备的再生硬质合金块体的SEM像

表2 不同配C量下制备的再生WC-16%Co硬质合金的性能

Fig.7

不同配C量下再生硬质合金的显微组织参数与性能的关系图

Fig.8

配C量为16.60%时制备的再生硬质合金块体的TEM像

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