W对热压烧结铁基金刚石工具胎体组织性能的影响
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摘要
采用机械合金化方法制备的铁基预合金粉作为主要结合剂,以金属w(W)0%~6%为添加剂,通过热压烧结方法制备金刚石工具胎体和金刚石/胎体材料,研究了W对胎体及金刚石/胎体复合材料密度、硬度、抗弯强度、把持能力和显微组织的影响。结果表明:W和金刚石的添加对热压烧结胎体及金刚石/胎体复合材料密度影响不大,随W的添加量增加,胎体硬度增加;W的添加,能够提高胎体对金刚石的把持能力,但随W含量的进一步增加胎体对金刚石把持力下降;W以颗粒形式弥散分布于Ni、Fe、Co骨架相附近或内部,少量分布于粘结相内部,使胎体显微组织细化和均匀化,胎体断口出现W颗粒脱嵌和穿晶解理。
Using Fe based pre-alloyed powder prepared by mechanical alloying method as the main binder, the standard specimen of diamond tools were prepared by hot press sintering process with metal W(0 %~6 %) in matrix.The effects of W on the density, hardness, bending strength, micro-structure and holding ability of the matrix and the diamond/matrix composites were studied. The results showed that the addition of W and diamond had little effect on the relative density of the matrix. The hardness of the matrix increased with the addition of W. The addition of metal W can improve the ability of the matrix to hold diamonds. But with the increasing of W, the holding ability of the matrix on diamonds decrease. W is mainly distributed inside and around the Ni, Fe, Co skeleton phases, and the else is distributed inside the bonded phase. The micro-structure of the matrix is refined and homogenized, and the dislocation and fracture of W grain occur at the fracture surface.
Using Fe based pre-alloyed powder prepared by mechanical alloying method as the main binder, the standard specimen of diamond tools were prepared by hot press sintering process with metal W(0 %~6 %) in matrix.The effects of W on the density, hardness, bending strength, micro-structure and holding ability of the matrix and the diamond/matrix composites were studied. The results showed that the addition of W and diamond had little effect on the relative density of the matrix. The hardness of the matrix increased with the addition of W. The addition of metal W can improve the ability of the matrix to hold diamonds. But with the increasing of W, the holding ability of the matrix on diamonds decrease. W is mainly distributed inside and around the Ni, Fe, Co skeleton phases, and the else is distributed inside the bonded phase. The micro-structure of the matrix is refined and homogenized, and the dislocation and fracture of W grain occur at the fracture surface.
引文
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[2]周浩钧.金属结合剂金刚石工具烧结技术的研究[D].西安:西安建筑科技大学,2014.ZHOU Haojun.Research on sintering technology of metal bonded diamond tools[D].Xi'an:Xi'an University of Architecture and Technology,2014.
[3]林增栋,徐乍英.含钛金属-金刚石粘结技术及其应用[J].地质与勘探,1984(6):76-81.LIN Zengdong,XU Zhaying.Titanium metal diamond bonding technology and its application[J].Geology and Exploration,1984(6):76-81.
[4]宋正发.用于花岗石粗、中磨的金刚石磨具的研制[J].石材,2001(9):22-24.SONG Zhengfa.Preparation of diamond abrasives for coarse and medium grinding of granite[J].Stone,2001(9):22-24.
[5]TILLMANN W.Trends and market perspectives for diamond tools in the construction industry[J].International Journal of Refractory Metals&Hard Materials,2000,18(6):301-306.
[6]孙毓超.金刚石与金属学基础[M].北京:中国建材工业出版社,1999:75-121.
[7]卢安军,林峰,秦海青,等.W对自由烧结型铁基金刚石工具胎体性能的影响[J].粉末冶金材料科学与工程,2016,21(6):840-846.LU Anjun,LIN Feng,QIN Haiqing,et al.Effect of W on the performance of free sintered Fe based diamond tools matrix[J].Materials Science and Engineering of Powder Metallurgy,2016,21(6):840-846.
[8]YAR M A,WAHLBERG S,BERGQVIST H,et al.Chemically produced nanostructured ODS-lanthanum oxide-tungsten composites sintered by spark plasma[J].Journal of Nuclear Materials,2011,408(2):129-135.
[9]周健,周强,袁德林,等.超细/纳米W-La2O3复合粉末的制备及烧结致密化行为研究[J].中国钨业,2015,30(6):42-48.ZHOU Jian,ZHOU Qiang,YUAN Delin,et al.Preparation and densification behavior of ultrafine/nano W-La2O3Composite Powder[J].China Tungsten Industry,2015,30(6):42-48.
[10]铁晓锐.烧结与钎焊工具中金刚石/结合剂结合特性及垂直轴磨削石材研究[D].泉州:华侨大学,2012.TIE Xiaorui.Research on the bonding at diamond/matrix interfaces of sintered and brazed diamond tools and their performance in vertical grinding of stone[D].Quanzhou:Huaqiao University,2012.
[11]国家标准局.致密烧结金属材料与硬质合金密度测定方法GB/T3850—1983[S].北京:中国标准出版社,1983.
[12]CHEN C,LIU X,WANG Z.The effects of ioining methods on the resistivity of W-Cu alloy and Cu joint[J].Physics Procedia,2012,25(22):68-72.
[13]ABOUD T,WEISS B Z,CHAIM R.Mechanical alloying of the immiscible system W-Cu[J].Nanostructured Materials,1995,6(supply1):405-408.
[14]MA Y,ZHANG J,LIU W,et al.Transient liquid-phase sintering characteristic of W-Ni-Fe alloy via microwave-assisted heating[J].Rare Metal Materials&Engineering,2014,43(9):2108-2111.
[15]KREIVAITIS R,ZUNDA A,KUP CINSKAS A,et al.A study of tribological behaviour of W-Co and Cu electro-spark alloyed layers under lubricated sliding conditions[J].Tribology International,2016(103):236-242.