Micro-FAST制备WC-TiC-Co硬质合金的性能和组织研究
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摘要
将多物理场耦合活化烧结技术(Micro-FAST)和燃烧合成技术相结合,在WC-8Co原始粉末中加入一定量的Ti粉和C粉,通过原位合成了TiC,制备了尺寸为φ4 mm×4 mm的WC-TiC-Co微型圆柱硬质合金。研究了工艺参数对硬质合金性能和组织的影响。结果表明,WC-8Co-4Ti-2C和WC-8Co-6Ti的样品在成分检测中均检测出TiC相,同时还伴随着(W,Ti)C相的生成。WC-8Co-4Ti-2C和WC-8Co-6Ti的样品致密度随着烧结温度的增加而增加,最高可达到96.82%;同时,试样的微观孔隙减少。显微硬度及断裂韧性均随烧结温度的增加而减小,显微硬度最高可达1936.7 HV30,断裂韧性最高可达8.0270 MPa·m~(1/2),整体上WC-8Co-6Ti样品的力学性能要优于WC-8Co-4Ti-2C样品的。
Combining micro-FAST with combustion synthesis, WC-TiC-Co cemented carbide with φ4 mm ×4 mm was prepared by adding a certain amount of Ti powder and C powder into WC-8Co raw powder through in situ synthesis of TiC.The effect of process pararmters on the microstructure and properties of cemented carbide was studued. The results show that the TiC phase and the(W, Ti)C phase are detected in both WC-8Co-4Ti-2C and WC-8Co-6 Ti sintering samples. The density of the samples increases with the increase of sintering temperature in both WC-8Co-4Ti-2C and WC-8Co-6Ti sintering samples, and the maximum value can reach 96.82%. Meanwhile, the micro porosity of the samples reduces. Both the microhardness and fracture toughness decrease with the increase of sintering temperature. The maximum microhardness can reach 1936.7 HV30, and the maximum fracture toughness can reach 8.0270 MPa·m~(1/2). On the whole, the mechanical properties of WC-8Co-6Ti samples are better than that of WC-8Co-4Ti-2C samples.
Combining micro-FAST with combustion synthesis, WC-TiC-Co cemented carbide with φ4 mm ×4 mm was prepared by adding a certain amount of Ti powder and C powder into WC-8Co raw powder through in situ synthesis of TiC.The effect of process pararmters on the microstructure and properties of cemented carbide was studued. The results show that the TiC phase and the(W, Ti)C phase are detected in both WC-8Co-4Ti-2C and WC-8Co-6 Ti sintering samples. The density of the samples increases with the increase of sintering temperature in both WC-8Co-4Ti-2C and WC-8Co-6Ti sintering samples, and the maximum value can reach 96.82%. Meanwhile, the micro porosity of the samples reduces. Both the microhardness and fracture toughness decrease with the increase of sintering temperature. The maximum microhardness can reach 1936.7 HV30, and the maximum fracture toughness can reach 8.0270 MPa·m~(1/2). On the whole, the mechanical properties of WC-8Co-6Ti samples are better than that of WC-8Co-4Ti-2C samples.
引文
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[2] Bounhoure V, Lay S, Coindeau S, et al.Effect of Cr addition on solid state sintering of WC-Co alloys[J].International Journal of Refractory Metals and Hard Materials,2015,52:21-28.
[3] Su W, Sun Y, Feng J, et al.Influences of the preparation methods of WC-Co powders on the sintering and microstructure of coarse grained WC-8Co hardmetals[J].International Journal of Refractory Metals and Hard Materials,2015,48:369-375.
[4] Rumman M R, Xie Z, Hong S J, et al.Effect of spark plasma sintering pressure on mechanical properties of WC-7.5 wt%Nano Co[J].Materials&Design, 2015, 68:221-227.
[5]唐琛,张崇才,盛智勇,等.超细WC-TiC-Co硬质合金粉体制备及其成型特性[J].西华大学学报(自然科学版), 2008(3):68-70.
[6] Gedevanishvili S, Deevi S C.Processing of iron aluminides by pressureless sintering through Fe+Al elemental route[J].Materials Science and Engineering A,2002,325(1/2):163-176.
[7]陈慧,彭玲玲,姜中涛,等.真空烧结温度对WC-TiC-TaC-Co硬质合金组织和性能的影响[J].粉末冶金工业,2015,25(3):33-36.
[8]杨嘉,叶金文,刘颖,等.烧结温度对WC-TiC-TaC-Co硬质合金性能的影响[J].功能材料,2011,42(2):160-162.
[9] Kim H C, Shon I J, Yoon J K, et al.Consolidation of ultra fine WC and WC-Co hard materials by pulsed current activated sintering and its mechanical properties[J].International Journal of Refractory Metals and Hard Materials,2007,25(1):46-52.
[10]刘文胜,徐志刚,马运柱.现代烧结技术在难熔金属材料中的应用[J].材料导报,2010,24(3):33-39.
[11]易健宏,唐新文,罗述东,等.微波烧结技术的进展及展望[J].粉末冶金技术,2003,21(6):351-354.
[12]罗军明,廖佳,陆磊,等.微波烧结制备WC-TiC-Co硬质合金的组织和性能研究[J].材料导报,2013,27(20):103-105.
[13] Lu D, Yang Y, Qin Y, et al.Effect of particle size and sintering temperature on densification during coupled multifield-activated microforming[J].Journal of Materials Research,2012,27(20):2579-2586.
[14] Du A, Yang Y, Qin Y, et al.Effects of heating rate and sintering temperature on 316 L stainless steel powders sintered under multiphysical field coupling[J].Materials and Manufacturing Processes,2012,28(1):66-71.
[15] Zhou Y, Yang Y, Yang G, et al.Effects of sintering temperature on the densification of WC-6Co cemented carbides sintered by coupled multi-physical-fields activated technology[J].Manufacturing Review,2015,2:18.
[16]吴明霞,杨刚,杨屹,等.多物理场耦合粉末成形中电热聚焦效应[J].四川大学学报(工程科学版),2014(S2):171-175.