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The Study on Mechanism of Rear Earth Elements in Iron Based Powder Metallurgical Friction Material

Author: ZhangHong
Tutor: SongZiZuo
School: Academy of Railway Sciences
Course: Vehicle Operation Engineering
Keywords: Rare earths Iron-based powder metallurgy Friction materials MoS2 Pb pool
CLC: TF125
Type: PhD thesis
Year: 2003
Downloads: 461
Quote: 2
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Abstract


In this thesis focuses on the rare earth iron-based powder metallurgy friction material impact on the mechanical properties and friction performance impact mechanism and to establish the model of the reaction mechanism of these effects. The study iron-based powder metallurgy friction materials main recipe the FMPS-type iron-based powder metallurgy friction material foundation formula. Firstly, four different types of rare earth materials based formulation added types of screening and the determination of the best content. Further study of the mechanical properties of the test results, finalized on Add A class of rare earth alloy material. Using quantitative metallographic, scanning electron microscopy, EDAX and X-ray photoelectron spectroscopy instruments such as depth microscopic analysis. The results of the analysis: When the addition amount of the optimum amount of the added rare earth full play to strengthen the matrix and to promote the role of the sintered sample to get the best mechanical properties; when added in an amount of rare earth is more than the optimum amount, the sample will appear in non-solid solution RE sample during sintering as the lubricating element MOS 2 produce an effect, promote their decomposition. Of MoS 2 the decomposition of S will be in the sample of the alloying elements Mn compound MnS inclusions, the presence of those inclusions causes the mechanical properties of samples decreased. To further explore the rare earth prompted the MoS 2 conditions and mechanism of decomposition, but also designed two additional experiments, the the supplementary experimental study results prove MoS 2 There are three necessary conditions for decomposition: First, the sintered samples have a non-solid solution RE exists; Secondly, the sintered samples have Pb exist; Finally, the temperature of the sample sintered to be higher than TC. Further analysis of rare earth in the the entire MoS 2 \/ sub> Pb pool \Academy of Railway Sciences scan, X-ray electron probe line summary of the doctoral thesis photoelectron spectrum analysis and the analysis and calculation of the thermodynamic determine the reaction system consisting of Pb, RE, MoSZ, Mn, Pb pool \The product is the MO and MnS. In this study, the final three tribology test: small sample friction test, 1:3 friction brake test and 1:1 friction brake test. The results illustrate the three test conclusion is entirely consistent with the variation of mechanical properties and microstructure analysis of the tribological parameters under different conditions. Thereby determining the amount of rare earth in the FMPS-type iron-based powder metallurgy friction material foundation formula there exists an optimum value, may make it more excellent mechanical properties and friction performance.

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CLC: > Industrial Technology > Metallurgical Industry > Metallurgical Technology > Powder metallurgy (metal ceramic technology ) > Powder metallurgy products and their applications
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