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材料研究学报  2014, Vol. 28 Issue (7): 490-496    DOI: 10.11901/1005.3093.2014.019
  本期目录 | 过刊浏览 |
Co含量对一种Ni-Co-Al粉末高温合金摩擦学性能的影响*
辛成来1,2,王文珍1(),马勤2,国洪建1
1. 中国科学院兰州化学物理研究所 固体润滑国家重点实验室 兰州 730000
2. 兰州理工大学材料科学与工程学院 兰州 730050
Effect of Co Content on Tribological Behavior of Ni-Co-Al P/M Superalloy
Chenglai XIN1,2,Wenzhen WANG1,**(),Qin MA2,Hongjian GUO1
1. State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000
2. School of Materials Science and Engineering, Lanzhou University of Technology, Lanzhou 730050
引用本文:

辛成来,王文珍,马勤,国洪建. Co含量对一种Ni-Co-Al粉末高温合金摩擦学性能的影响*[J]. 材料研究学报, 2014, 28(7): 490-496.
Chenglai XIN, Wenzhen WANG, Qin MA, Hongjian GUO. Effect of Co Content on Tribological Behavior of Ni-Co-Al P/M Superalloy[J]. Chinese Journal of Materials Research, 2014, 28(7): 490-496.

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摘要: 

采用粉末冶金(机械合金化+真空热压烧结)制备不同Co含量的Ni-Co-Al系高温合金, 并考察合金在800℃下的高温摩擦学性能与Co含量的变化关系。结果表明: 适量的Co可以提高合金的硬度和抗压强度, 并改善合金的摩擦学性能, 但过量的Co(Co质量分数达到30%)又使合金的摩擦学性能变差。磨痕表面的扫描电子显微镜(SEM)和X射线光电子能谱(XPS)及能谱(EDS)分析表明, 磨痕表面形成了由CoO等组成的氧化物“釉质层”。这层“釉质层”的成分及其在摩擦过程中的脱落程度影响了合金的高温摩擦学性能。

关键词 金属材料粉末高温合金摩擦学性能氧化物    
Abstract

Ni-Co-Al high temperature alloys with different Co content were prepared by powder metallurgy (mechanical alloying and hot-press sintering), of which the high temperature tribological properties were investigated at 800℃. The results showed that the hardness and compressive strength, as well as the tribological properties of alloys could be improved with a Co addition in a range from 5-30 mass%, among which 20 mass% is the optimal. The observation of worn surfaces by SEM, XPS and EDS revealed that a “glaze-like film” consisted of CoO and other oxides existed on the worn surface. The high temperature tribological properties of the alloys are highly related with the composition and the spallation tendency of the formed glaze film during the friction and wear process.

Key wordsmetallic materials    P/M superalloy    tribological behavior    oxide
收稿日期: 2014-01-18     
基金资助:* 国家自然科学青年基金51101166资助项目。
Specimens Composition (mass fraction) Ball-milling periods/h Hot-pressing temperature/℃ Density/gcm-3
NA Ni-5%Al 20 1200 7.79
NAC5 Ni-5%Al-5%Co 30 1200 7.78
NAC10 Ni-5%Al-10%Co 60 1200 7.73
NAC20 Ni-5%Al-20%Co 60 1200 7.77
NAC30 Ni-5%Al-30%Co 60 1200 7.81
  
图1  不同Co含量的混合粉末球磨后的XRD图谱
图2  不同Co含量试样烧结后的XRD图谱
图3  不同Co含量合金电解腐蚀后的SEM像
图4  合金硬度、抗压强度随Co含量的变化曲线
图5  合金在800℃摩擦系数、磨损率与Co含量的变化关系
图6  合金800℃时, 摩擦系数与时间的变化关系
图7  合金磨痕表面的SEM像
图8  合金NAC20 磨痕表面元素的XPS图谱
Materials 400F(204℃) 600F(316℃) 1100F (593℃)
CoO 0.46 0.38 0.18
NiO 0.70 - 0.69
Al2O3 0.77 - -
  与不锈钢配副单一金属氧化物的摩擦系数表
Sample Ni2p3/2 Co2p3/2 Al2p
Ni0 Ni3Al NiO NiAl2O4 Co0 CoO CoAl2O4 Co3O4 Al0 Ni3Al Al2O3 CoAl2O4 NiAl2O4
BE / eV 852.5 852.65 854.0 856.0 778.1 780.1 781.7 780.5 71.7 72.4 74.3 74.5 74.5
References [17,22] [18] [17,22] [19,22] [20] [20] [20,23] [20] [21] [22] [22] [23] [22]
表3  XPS结合能对照表
Specimens Ni Co Al
NA 95.37 0 4.63
NAC5 91.28 4.95 3.77
NAC10 85.14 11.30 3.57
NAC20 71.82 25.01 3.17
NAC30 56.28 40.20 3.53
表4  合金800℃摩擦后磨痕表面元素含量
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