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 .
Powder metallurgy derived microporous Al2O3/FeCrWMoV metal ceramic preforms were infiltrated with 60Pb40Sn based solid lubricants to create almost fully dense self-lubrication composites. By means of scanning electron microscope (SEM) and energy dispersive X-ray spectrometer (EDS), it was found that 60Pb40Sn-based solid lubricants are well dispersed and embedded in the Al2O3/FeCrWMoV matrix. The friction and wear behaviors of the composites sliding against ZrO2 ceramic from ambient to 800 °C were investigated using a pin-on-disk wear tester.The results showed that the composites exhibited self-lubricating properties at elevated temperatures up to 700 °C. The friction coefficients of less than 0.27 at 600 °C and wear rates of 6×10−6 mm3/N m are obtained when rubbing against ZrO2 ceramic under a normal load of 50 N and a sliding speed of 0.139m/s for 2 hours. The occurrences of lower friction coefficient and plateau in wear rate have been related to the formation of a film of lubricant almost covered entirely the substrate beneath.
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