Microwave reaction sintering on WC-Co cemented carbides fabrication

被引：0

作者：

Bao R. ^{[1
]}

Guo S.-D. ^{[2
]}

Yi J.-H. ^{[1
]}

Chen H. ^{[2
]}

Yang J.-G. ^{[2
]}

Yu F. ^{[2
]}

机构：

[1] School of Materials Science and Engineering, Kunming University of Science and Technology, Kunming

[2] Project Research Institute, Jiangxi University of Science and Technology, Ganzhou

来源：

Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals | 2020年 / 30卷 / 08期

基金：

中国国家自然科学基金;

关键词：

Cemented carbides; Microstructure; Microwave reaction sintering; Properties; Sintering parameters;

D O I：

10.11817/j.ysxb.1004.0609.2020-37355

中图分类号：

学科分类号：

摘要：

Tungsten powder, cobalt powder and carbon black were invoked as raw materials.WC-6Co cemented carbides were prepared by ball-milling, compression moulding and microwave reaction sintering. The effects of sintering factors (Sintering temperature, heating rate and holding time) and the average particle size of W powders on the microstructure and properties of cemented carbides were investigated by XRD, SEM, Vickers hardness tester, et al. The results show that W powders with an average size of 1.3 μm can be carbonized to WC by C when the temperature is greater than 1100 ℃. The high densification of cemented carbide can be achieved when the temperature is 1300℃. The Vickers hardness (HV30) and fracture toughness (Wk) are 1999 N/mm2 and 8.51 MPa∙m1/2, respectively. No obvious property changes occur when sintering temperature increases to 1400℃. The residual pores in the alloy increase with reducing the sintering temperature, increasing the heating rate and reducing the holding time, which would result in the decrease of HV30 and Wk. It is considered that the microstructure is uniform and the comprehensive properties is the best when the microwave reaction sintering temperature is 1300℃, the heating rate is 100℃/min, and the holding time is 10 min. Subsequently, coarse grained WC-6Co cemented carbides are prepared from W powders with an average size of 27.0 μm and compared with fine grained WC-6Co cemented carbides. The results show that W2C exists in the alloy prepared from coarse W powders. The parameters of microwave reaction sintering are also affected by the average size of W powders. © 2020, Science Press. All right reserved.

引用

页码：1828 / 1836

页数：8

共 29 条

[1]

GUO Shend-da, BAO Rui, YI Jian-hong, YANG Jian-gao, LIU Liang, YANG Ping, Effects of SPS sintering parameters on microstructure and properties of WC-6Co cemented carbides with Mo addition, The Chinese Journal of Nonferrous Metals, 28, 3, pp. 556-564, (2018)

[2]

GUO S D, BAO R, YANG J G, CHEN H, YI J H., Effect of Mo and Y2O3 additions on the microstructure and properties of fine WC-Co cemented carbides fabricated by spark plasma sintering, International Journal of Refractory Metals and Hard Materials, 69, pp. 1-10, (2017)

[3]

RAIHANUZZAMAN R M, HAN ST., Conventional sintering of WC with nano-sized Co binder: Characterization and mechanical behavior, International Journal of Refractory Metals and Hard Materials, 53, pp. 2-6, (2015)

[4]

XIE H, LIU Y, YE J, LI M, ZHU Y F, FAN H J., Effect of (Cr0.8V0.2)2(C, N) addition on microstructure and mechanical properties of WC-8Co cemented carbides, International Journal of Refractory Metals and Hard Materials, 47, pp. 145-149, (2014)

[5]

HUANG Z, REN X R, LIU M X, XU C, ZHANG X H, GUO S D, CHEN H., Effect of Cu on the microstructures and properties ofWC-6Co cemented carbides fabricated by SPS, International Journal of Refractory Metals and Hard Materials, 62, pp. 155-160, (2017)

[6]

FABIJANIC T A, ALAR Z, CORIC D., Influence of consolidation process and sintering temperature on microstructure and mechanical properties of near nano-and nano-structured WC-Co cemented carbides, International Journal of Refractory Metals and Hard Materials, 54, pp. 82-89, (2016)

[7]

DEMIRSKYI D, BORODIANSKA H, AGRAWAL D, RAGULYA A, SAKKA Y, VASYLKIV O., Peculiarities of the neck growth process during initial stage of spark-plasma, microwave and conventional sintering of WC spheres, Journal of Alloys and Compounds, 523, pp. 1-10, (2012)

[8]

BAO R, YI J H., Application of microwave sintering technology in cemented carbide preparation, The Chinese Journal of Nonferrous Metals, 24, 6, pp. 1544-1561, (2014)

[9]

BREVAL E, CHENG J P, AGRAWAL D K, GIGL P, DENNIS M, ROY R, PAPWORTH A J., Comparison between microwave and conventional sintering of WC/Co composites, Materials Science and Engineering A, 391, pp. 285-295, (2005)

[10]

ZHOU Jian, CHENG Ji-ping, YUAN Run-zhang, ZHANG Yun-jin, QIU Jin-yu, Property and technology of WC-Co fine grain cemented carbide in microwave sintering, The Chinese Journal of Nonferrous Metals, 9, 3, pp. 465-468, (1999)

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