球磨时间对无粘结相超细硬质合金组织及性能的影响
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摘要
采用传统粉末冶金方法在1 850℃真空烧结条件下制备了无粘结相超细硬质合金,研究了球磨时间对无粘结相超细硬质合金组织及性能的影响。结果表明:球磨时间对无粘结相超细硬质合金组织及性能有显著的影响,延长球磨时间有助于合金的烧结致密化,降低烧结体孔隙度;而延长球磨时间对合金WC平均晶粒度和粒度组成影响不明显;在WC粉末配碳量不足时,烧结后的合金中产生W_2C相,并且W_2C相含量随着球磨时间的延长而逐渐增加;随着球磨时间的延长,合金的硬度(HV_(10))先增加然后趋于稳定,合金的断裂韧性随球磨时间的变化不明显。当球磨时间为84 h时,合金的综合性能最佳,维氏硬度(HV_(10))为2 590 kg/mm~2,断裂韧性为6.7 MPa·m~(1/2)。
The binderless ultrafine cemented carbide was prepared by traditional powder metallurgy method under the vaccum sintering conditions of 1 850 ℃. The effects of milling time on the microstructure and properties of binderless ultrafine cemented carbide were studied. The results show that the milling time has a significant effect on the microstructure and properties of the cemented carbide. Increasing the milling time will contribute to the sintering densification of the alloy and reduce the porosity of the sintered body. The effect of milling time increasing on average grain size and grain size composition of WC alloy is not obvious. W_2C phase is produced in the sintered alloy when the carbon content of the WC powder is insufficient, and the W_2C phase content gradually increases with the increase of the milling time. With the increase of the milling time, the hardness of the alloy(HV_(10)) increases first and then tends to stabilize, while the fracture toughness of the alloy does not change significantly with the milling time. When the milling time is 84 h, the alloy has the best comprehensive performance with Vickers hardness(HV_(10)) of 2 590 kg/mm~2 and fracture toughness of 6.7 MPa·m~(1/2).
The binderless ultrafine cemented carbide was prepared by traditional powder metallurgy method under the vaccum sintering conditions of 1 850 ℃. The effects of milling time on the microstructure and properties of binderless ultrafine cemented carbide were studied. The results show that the milling time has a significant effect on the microstructure and properties of the cemented carbide. Increasing the milling time will contribute to the sintering densification of the alloy and reduce the porosity of the sintered body. The effect of milling time increasing on average grain size and grain size composition of WC alloy is not obvious. W_2C phase is produced in the sintered alloy when the carbon content of the WC powder is insufficient, and the W_2C phase content gradually increases with the increase of the milling time. With the increase of the milling time, the hardness of the alloy(HV_(10)) increases first and then tends to stabilize, while the fracture toughness of the alloy does not change significantly with the milling time. When the milling time is 84 h, the alloy has the best comprehensive performance with Vickers hardness(HV_(10)) of 2 590 kg/mm~2 and fracture toughness of 6.7 MPa·m~(1/2).
引文
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[15]赵世贤.超细晶WC-Co硬质合金的制备、组织表征和性能的研究[D].北京:北京工业大学,2010:83-85.Zhao Shixian.Study on preparation,microstructure characterizition and properties of ultrafine WC-Co cermets[D].Beijing:Beijing University of Technology,2010:83-85.
[2]Suzuki H.cemented Carbide and sintered hard materials[M].Tokyo:Maruzen Publishing Company,1986.
[3]周腾,夏铁锋,高立新,等.超细无粘结相WC基陶瓷的研究进展[J].硬质合金,2014,31(2):120-124.Zhou Teng,Xia Tiefeng,Gao Lixin,et al.Technical progress of binderless WC-based Nanostructured Cemented Carbide[J].Cemented Carbide,2014,31(2):120-124.
[4]Imasato S,Tokumoto K,Kitadat T,et al.Properties of urtra-fine grain binderless cemented carbide'RCCFN'[J].International Journal of Refractory Metals&Hard Meterials,1995,13(5):305-312.
[5]林小为.少、无粘结相超细晶WC硬质合金的制备与性能研究[D].广州:华南理工大学,2012:6-13.Lin Xiaowei.The preparation and properties of less/no binder phace ultrafine WC cemented carbide[D].Guangzhou:South China University of Technology,2012:6-13.
[6]李仁琼,刘铁梅.工艺参数对无粘结相硬质合金性能的影响[J].硬质合金,2005,22(1):23-26.Li Renqiong,Liu Tiemei.Effects of processing parameters on the properties of Non-bond Cemented Carbide[J].Cemented Carbide,2005,22(1):23-26.
[7]张立,陈述,黄方杰,等.微量钴对无金属粘结相WC硬质合金烧结致密化与WC晶粒生长行为的影响[J].硬质合金,2011,28(5):271-275.Zhang Li,Chen Shu,Huang Fangjie,et al.Effects of small amount of cobalt addition on densification and WC grain growth during sintering of binderless cemented tungsten carbide[J].Cemented Carbide,2011,28(5):271-275.
[8]罗海辉,谢晨辉,彭宇.WC粉末粒度特征与硬质合金WC晶粒粒度关系的定量研究[J].硬质合金,2016,33(5):312-321.Luo Haihui,Xie Chenhui,Peng Yu.Quantitative research on relationship between particle size characteristics of WC powder and WC grain size of cemented carbide[J].Cemented Carbide,2016,33(5):312-321.
[9]阳冬元,周春成.WC块球磨工艺对WC粉及其合金性能的影响[J].硬质合金,2013,30(3):141-146.Yang Dongyuan,Zhou Chuncheng.Effect of WC block milling process on properties of WC powder and its alloy[J].Cemented Carbide,2013,30(3):141-146.
[10]张武装,刘咏,黄伯云.纳米晶WC-Co硬质合金的研究现状[J].材料导报,2007,(02):79-82.Zhang Wuzhuang,Liu Yong,Huang Baiyun.Research and development of nanocrystalline WC-Co cemented carbide[J].Materials Bulletin,2007(02):79-82.
[11]张武装,高海燕,黄伯云.纳米晶WC-Co复合粉末制备的研究[J].稀有金属材料与工程,2007(07):1253-1256.Zhang Wuzhuang,Gao Haiyan,Huang Baiyun.Research on fabrication of nanocrystalline WC-Co composite powder[J].Rare Metal Materials and Engineering,2007(07):1253-1256.
[12]Lee H C,Gurland J.Hardness and deformation of cemented tungsten carbide[J].Materials Science and Engineering.1978,33:125-133.
[13]Xu Z H,Agren J.Modified hardness model for WC-Co cemented carbides[J].Materials Science and Engineering A,2004,386:262-268.
[14]余立新,张烈华,陆庆忠,等.硬质合金的韧性评价[C].2009年全国粉末冶金学术会议论文集,北京:中国有色金属学会,2009:256-262.Yu Lixin,Zhang Liehua,Lu Qingzhong,et al.Evaluation of the toughhness of cemented carbide[C].2009 National Powder Metallurgy Academic Conference Proceedings,Beijing:China Nonferrous Metals Society,2009:256-262.
[15]赵世贤.超细晶WC-Co硬质合金的制备、组织表征和性能的研究[D].北京:北京工业大学,2010:83-85.Zhao Shixian.Study on preparation,microstructure characterizition and properties of ultrafine WC-Co cermets[D].Beijing:Beijing University of Technology,2010:83-85.