In order to enhance the lubricating capacity of the magnetic lubrication on the surface of the porous material, a new magnetic lubricating field has been designed by simulating method based on the coupling relationship between the pores and micro-magnets structure. The results show that the output characteristics of magnetic fluids in the pores of the material play a significant role in the design, whereas the output characteristics depend on micro-magnets and the pores’ size such as length and diameter, for example, when the ratio of length/diameter of the pore is larger than 3.2 ,the output capacity of the magnetic fluids in the pores presents a stable value, but when the ratio is smaller than 3.2, the output capacity obviously decreases. It is also found when the distance among the pores changes from 5 mm to 8 mm, the output capacity also presents a stable value; however, the output capacity obviously decreases with the increased distance among the pores beyond 8 mm. Furthermore, the effect of the parameters of micro-magnets structure on the output capacity of magnetic fluids is also investigated in the paper. The research results are helpful to improve the lubricating properties of the magnetic fluids on the surface of the porous material.
The effects of Young’s modulus of materials on the rolling resistance characteristics of ball bearing have been investigated by experimental,analytical and numerical method. Results show that the Young’s modulus of ball bearing greatly affects its rolling resistance characteristics and the characteristic values of the rolling resistance characteristics will decrease with the increase of the Young’s modulus of ball bearing, for example, the elastic power consumption of the ZrO2 bearing is about 80 percent of the GCr15 bearing, and that the effects mainly reflects on three aspects: the elastic hysteresis of the material, the contact stress and deformation in the contact region.Results are helpful to the design of materials compatibility of ball bearing.
A new cermet sinter with sweat-gland micro-pore structure has been developed by powder
metallurgy technology in vacuum. The effects of the pore-forming materials on micro-pore structure
and Y2O3 additions as well mechanical properties of TiC/FeCrWMoV cermets were investigated.
Some typical sweat-gland micro-pores were formed while compound additives TiH2 and CaCO3
adding into the sinter matrix. The porosity of the cermet sinters changes from 20% to 28% with the
compound additives from 6% to 8%, and the micro-pores of sinters exist a regularized and
interpenetrated network structure just like human’s sweat-gland one and obeying to Rayleigh
Distribution. As such the sinters could be easily infiltrated with high-temperature solid lubricant. For
improving the property of the ceramet sinter, the elements Y2O3 of 0.6~0.8% (vol. fraction ) was also
added into the sinter matrix and its effect on the sinter has been also discussed .
In the paper, a three-dimensional model is developed with cellular automaton method based on a series of experiments and the self-lubricating mechanism analysis. The model is used to investigate the dynamic friction process of sweat self-lubricating composite during high temperature sliding. The sliding friction coefficient and the distribution of lubricant on the worn surface of the composite are calculated out by using the cellular automaton (CA) model. The agreement between the computing and experimental results shows the model developed in the paper can be effectively used to study the friction behaviors of the sweat self-lubricating composite at high temperature.
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