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Modification and Study of Nano-Y2O3 as Lubricant Additive

Author: ZhangLin
Tutor: YuLin
School: Guangdong University of Technology
Course: Applied Chemistry
Keywords: Nano - yttria Surface Modification Lubricant additives Tribological properties
CLC: TB383.1
Type: Master's thesis
Year: 2011
Downloads: 48
Quote: 0
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Abstract


Nano Rare Earth particles due to the quantum size effect and surface effect, Nano Rare Earth lubricant additives can significantly improve lubrication performance and carrying capacity, has incomparable superiority of conventional lubricant additives, nano-rare earth materials both nano materials and rare earth The unique properties of materials, nano-rare earth materials with strong hydrophilic properties, stable dispersion can not be the basis of the lubricant, surface improvements need to be. The main work of this paper is the study of the surface modification of nano-yttria as lubricant additives wear antifriction performance. The following is the main contents and conclusions: (1) prepared by precipitation nano yttria, the preparation conditions: yttrium ion concentration of 0.35 mol / L, dispersing agent dosage 12g / L, the molar ratio of n (NH4HCO3): n (Y3 ) = 4:1, reaction temperature 90 ° C, stirring rate 400r/min; precursor drying temperature of 80 ° C, drying time 13h, precursor calcination temperature 850 ° C, the calcination time 2h. The experimental results show that: the nanocrystalline yttria structure of the cubic system; the CaF2 fluorite-type structure; were spherical particles; regular size and shape, and the average particle size in the nano-yttria particles around 25.0 nm. (2) stearic acid esterification modified yttrium oxide nanoparticles, nano-yttria esterification modification process: the modifier amount of nano-yttria ratio 10:2, modified time of 120 minutes, the pH = 6.0, the modified nano yttria lipophilic degree of 70.59%. Experimental results show that: modified by stearic acid does not affect the crystal structure of the nano-yttria; modified nano yttria remains spherical; stearic link yttrium oxide nanoparticles surface chemical bonding, the surface of the nano-yttria coated on a layer of stearic acid, coated 12.17%. (3) the use of the silane coupling agent is vinyl trimethoxy silane (A-171) on the nano yttria coupling modified, and then using the graft-modified method for coupling the modified nano yttria graft modified methacrylate on nano yttria-coated. The coupled modified modification process: the reaction temperature is 70 ℃; coupling agent with ratio 10:4; reaction time 4h; amount of glacial acetic acid, 0.2 mL / g (Y2O3). Modification Process: reaction temperature 75 ° C, triggering a dosage of 1.3% (relative to the quality of the monomer methacrylate), modified time 3h, monomer ratio of 1:12. Experimental results show that: modified will not affect the polymorphs of yttrium oxide nanoparticles conjugated modified nano-yttria surface coating layer of coupling agent, the coating amount of 8%; graft modification coupled change sexual nano yttria-coated layer of methyl acrylate coating amount of 22.2%. (5) the use of four-ball tester modified nano yttria measured in liquid paraffin as the lubricating properties of the lubricant additives, the results showed that: the modified nano yttria lubricant performance has greatly improved, extremely maximum pressure performance PB value increased to more than 500N; sintering load the maximum value of PD to 1569N wear scar diameter is 21% smaller than the liquid paraffin, and the modified nano yttria better dispersion stability. Comparative analysis, stearic acid modified nano-yttria friction and wear properties are superior to the graft-modified nano yttrium oxide, stearic acid modified nano-yttria the better lubricating properties.

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