TiC含量对WC-TiC-TaC硬质合金材料微观组织及力学性能的影响

doi:10.15541/jim20160633

摘要/Abstract

摘要：

本研究采用真空热压烧结技术, 在1600℃下制备了WC-TiC-TaC硬质合金材料, 研究了TiC含量对其微观组织及力学性能的影响。结果表明, 随着TiC含量的增多, 硬质合金材料的晶粒显著增大。当TiC的含量从10wt% 增加到25wt%时, 硬质合金材料的硬度逐渐增大, 最高可达19.81 GPa, 这是由于TiC的硬度高于基体WC的硬度; 与此同时, 硬质合金材料的抗弯强度和断裂韧度逐渐减小。当TiC的含量为10wt%时, 材料的抗弯强度有最大值, 其值为1147.24 MPa, 这是由于在材料内部形成了均匀、细小的晶粒组织; 在此含量下, 复合材料的增韧机理为细晶增韧、裂纹偏转、裂纹分支、裂纹桥接和韧窝增韧, 其断裂韧度有最大值, 为14.60 MPa·m^1/2。

关键词: WC-TiC-TaC硬质合金, 热压烧结, 微观结构, 力学性能

Abstract:

WC-TiC-TaC cemented carbides were fabricated by hot-pressed sintering at 1600℃. Effects of TiC content on the microstructure and mechanical properties of these cemented carbides were investigated. It was found that when TiC content was increased from 10wt% to 25wt%, both the average grain size and the Vickers hardness increased progressively, but both the flexural strength and the fracture toughness decreased gradually. The increase of Vickers hardness was attributed to the increase of TiC content and the hardness of TiC was higher than that of WC. The value of the highest Vickers hardness was 19.81 GPa. This work also showed that the highest flexural strength (1147.24 MPa) was ascribed to the fine and homogeneous grains, and that the highest fracture toughness (14.60 MPa·m^1/2) was due to the intensive coupled mechanism of the fine-grain toughening, crack deflection, crack branching, crack bridging, and toughness dimples.

Key words: WC-TiC-TaC cemented carbides, hot-pressed sintering, microstructure, mechanical properties

中图分类号:

TB333
TG711

高姣姣, 姜龙凯, 宋金鹏, 梁国星, 安晶, 谢俊彩, 曹磊, 吕明. TiC含量对WC-TiC-TaC硬质合金材料微观组织及力学性能的影响[J]. 无机材料学报, 2017, 32(8): 891-896.

GAO Jiao-Jiao, JIANG Long-Kai, SONG Jin-Peng, LIANG Guo-Xing, AN Jing, XIE Jun-Cai, CAO Lei, LV Ming. Effects of TiC Content on Microstructure and Mechanical Property of WC-TiC-TaC Cemented Carbides[J]. Journal of Inorganic Materials, 2017, 32(8): 891-896.

图/表 8

Table1 Compositions of WC-TiC-TaC cemented carbides

Sample	WC/wt%	TiC/wt%	TaC/wt%	Ni/wt%
S1	78	10	2	10
S2	73	15	2	10
S3	68	20	2	10
S4	63	25	2	10

Fig. 1 XRD patterns of WC-TiC-TaC cemented carbides

Fig. 2 BSE micrographs of polished surfaces of WC-TiC-TaC cemented carbides(a) WC-10wt%TiC-TaC (S1); (b) WC-15wt%TiC-TaC (S2); (c) WC-20wt%TiC-TaC (S3); (d) WC-25wt%TiC-TaC (S4)

Fig. 3 EDS results corresponding to Point A and Point B in Fig. 2

Fig. 4 Ta element distribution corresponding to Area C in Fig. 2

Fig. 5 Fracture morphologies of WC-TiC-TaC cemented carbides(a) WC-10wt%TiC-TaC (S1), (b) WC-15wt%TiC-TaC (S2), (c) WC-20wt%TiC-TaC (S3), (d) WC-25wt%TiC-TaC (S4)

Fig. 6 Influence of TiC content on mechanical properties of WC-TiC-TaC cemented carbides

Fig. 7 Crack propagation paths of WC-TiC-TaC cemented carbides(a)WC-10wt%TiC-TaC (S1); (b) WC-25wt%TiC-TaC (S4)

参考文献 36

[1]	UPADHYAYA G S.Materials science of cemented carbides - an overview.Mater. Des., 2001, 22: 483-489.
[2]	MOUSTAFA S F, ABDEL-HAMID Z, OSAMA G, et al.Hussien, Synthesis of WC hard materials using coated powders.Adv. Powder Technol., 2011, 22: 596-601.
[3]	LIN N, WU C H, HE Y H, et al.Effect of Mo and Co additions on the microstructure and properties of WC-TiC-Ni cemented carbides.Int. J. Refract. Met. Hard Mater., 2012, 30: 107-113.
[4]	KIM HWAN-CHEOL, PARK HYUN-KUK, JEONG IN-KYOON, et al.Sintering of binderless WC-Mo2C hard materials by rapid sintering process.Ceram. Int., 2008, 34: 1419-1423.
[5]	RAJABI A, GHAZALI M J, DAUD A R.Chemical composition, microstructure and sintering temperature modifications on mechanical properties of TiC-based cermet - a review.Mater. Des., 2015, 67: 95-106.
[6]	MILL B.Recent developments in cutting tool materials.J. Mater. Process Technol., 1996, 56: 16-23.
[7]	YANG XUEFENG, WANG SHOUREN, YANG LIYING, et al.Research on the wear behaviors of WC-8Co and Al2O3-TiC conical dies.J. Inorg. Mater., 2012, 27(8): 876-882.
[8]	YAN KE, WANG YATAI, ZHU YONGSHENG, et al.Investigation on heat dissipation characteristic of ball bearing cage and inside cavity at ultra high rotation speed.Tribol. Int., 2016, 93: 470-481.
[9]	XIONG JI, GUO ZHIXING, YANG MEI, et al.Tool life and wear of WC-TiC-Co ultrafine cemented carbide during dry cutting of AISI H13 steel.Ceram. Int., 2013, 39: 337-346.
[10]	ZHAO JUN, YUAN XUNLIANG, ZHOU YONGHUI.Cutting performance and failure mechanisms of an Al2O3/WC/TiC micro- nano-composite ceramic tool.Int. J. Refract. Met. Hard Mater., 2010, 28: 330-337.
[11]	MAHMOODAN M, ALIAKBARZADEH H, GHOLAMIPOUR R.Sintering of WC-10% Co nano powders containing TaC and VC grain growth inhibitors.Trans. Nonferrous Metals Soc. China, 2011, 21: 1080-1084.
[12]	OUYANG CHENXIN, ZHU SHIGEN, QU HAIXIA.VC and Cr3C2 doped WC-MgO compacts prepared by hot-pressing sintering.Mater. Des., 2012, 40: 550-555.
[13]	GENGA R M, CORNISH L A, AKDOGAN G.Effect of Mo2C additions on the properties of SPS manufactured WC-TiC-Ni cemented carbides.Int. J. Refract. Met. Hard Mater., 2013, 41: 12-21.
[14]	XIONG JI, GUO ZHIXING, SHEN BAOLUO, et al.The effect of WC, Mo2C, TaC content on the microstructure and properties of ultra-fine TiC0.7N0.3 cermet.Mater. Des., 2007, 28: 1689-1694.
[15]	WU PENG, ZHENG YONG, ZHAO YONGLE, et al.Effect of TaC addition on the microstructures and mechanical properties of Ti(C, N)-based cermets.Mater. Des., 2010, 31: 3537-3541.
[16]	GENGA R M, AKDOGAN G, WESTRAADT J E, et al.Microstructure and material properties of PECS manufactured WC-NbC-Co and WC-TiC-Ni cemented carbides.Int. J. Refract. Met. Hard Mater., 2015, 49: 240-248.
[17]	PIRSO J, VILJUS M, LETUNOVITŠ S.Friction and dry sliding wear behavior of cermets. Wear, 2006, 260: 815-824.
[18]	ZOU BIN, HUANG CHUANZHEN, SONG JINPENG, et al.Effects of sintering processes on mechanical properties and microstructure of TiB2-TiC + 8wt% nano-Ni composite ceramic cutting tool material.Mater. Sci. Eng. A, 2012, 540: 235-244.
[19]	SUN PEIQIU, ZHU DEGUI, JIANG XIAOSONG, et al.Research on microstructures and properties of in-situ synthesis of TiB2-TiC0.8-SiC multiphase ceramics.J. Inorg. Mater., 2013, 28(4): 363-368.
[20]	LIN NAN, HE YUEHUI, WU CHONGHU, et al.Influence of TiC additions on the corrosion behaviour of WC-Co hardmetals in alkaline solution.Int. J. Refract. Met. Hard Mater., 2014, 46: 52-57.
[21]	YU YINHU, WANG TAO, ZHANG HONGMIN, et al.Low temperature combustion synthesis of TiC powder induced by PTFE.J. Inorg. Mater., 2015, 30(3): 272-276.
[22]	YANG SHIE, LU ZHANLING, FAN ZHIQIN, et al.Highly adherent diamond film deposited onto WC-Co cemented.J. Inorg. Mater., 2005, 20(1): 235-238.
[23]	FANG Z Z, WANG X, RYU T, et al.Synthesis, sintering, and mechanical properties of nanocrystalline cemented tungsten carbide-a review. Int. J. Refract. Met. Hard Mater., 2009, 27: 288-299.
[24]	KONG D H, HE BS, LIN L H.Effect of chromium content on structure and properties of WC-based cemented carbide.Shanghai Nonfer. Metal, 2005, 26: 53-57.
[25]	SHI KAI-HUA, ZHOU KE-CHAO, LI ZHI-YOU, et al.Effect of adding method of Cr on microstructure and properties of WC-9Ni-2Cr cemented carbides.Int. J. Refract. Met. Hard Mater., 2013, 38: 1-6.
[26]	LINDAHL P, GUATAFSON P, ROLANDER U, et al.Microstructure of model cermets with high Mo or W content.Int. J. Refract. Met. Hard Mater., 1999, 17: 411-421.
[27]	LIU N, XU Y D, LI Z H, et al.Influence of molybdenum addition on the microstructure and mechanical properties of TiC-based cermets with nano-TiN modification.Ceram. Int., 2003, 29: 919-925.
[28]	KWON HANJUNG, SUH CHANG-YUL, KIM WONBAEK.Microstructure and mechanical properties of (Ti,W)C-Ni cermet prepared using a nano-sized TiC-WC powder mixture. J. Alloy. Compd., 2015, 639: 21-26.
[29]	CHENG ZHANG, JINPENG SONG, LONGKAI JIANG, et al.Fabrication and tribological properties of WC-TiB2 composite cutting tool materials under dry sliding condition.Tribol. Int., 2017, 109: 97-103.
[30]	SHON I J, JEONG I K, KO I Y, et al.Sintering behaviour and mechanical properties of WC-10Co, WC-10Ni and WC-10Fe hardmaterials produced by high frequency induction heated sintering.Ceram. Int., 2009, 35: 339-344.
[31]	LI YUXIN, BAI PEIKANG, WANG YAOMIN, et al.Effect of TiC content on Ni/TiC composites by direct laser fabrication.Mater. Des., 2009, 30: 1409-1412.
[32]	EE KYONG H, CHA SEUNG I, KIM BYUNG K, et al.Effect of WC/TiC grain size ratio on microstructure and mechanical properties of WC-TiC-Co cemented carbides.Int. J. Refract. Met. Hard Mater., 2006, 24: 109-114.
[33]	LI ANHAI, ZHAO JUN, WANG DONG, et al.Three-point bending fatigue behavior of WC-Co cemented carbides.Mater. Des., 2013, 45: 271-278.
[34]	WANG JUN, LIU YING, ZHANG PING, et al.Effect of VC and nano-TiC addition on the microstructure and properties of micrometer grade Ti(CN)-based cermets.Mater. Des., 2009, 30: 2222-2226.
[35]	NIELS HANSEN.Hall-Petch relation and boundary strengthening.Scripta Mater., 2004, 51: 801-806.
[36]	SONG JINPENG, HUANG CHUANZHEN, ZOU BIN, et al.Microstructure and mechanical properties of TiB2-TiC-WC composite ceramic tool materials.Mater. Des., 2012, 36: 69-74.