Tribology is interesting science. Never get what you expected
Tribology Letters July 2012, Volume 47, Issue 1, pp 91-102
Date: 08 May 2012
Tribological Effects of BN and MoS2 Nanoparticles Added to Polyalphaolefin Oil in Piston Skirt/Cylinder Liner Tests
Nicholaos G. Demas, Elena V. Timofeeva, Jules L. Routbort, George R. Fenske
Abstract
We report in this article the friction and wear results of polyalphaolefin (PAO 10) base oil with the addition of 3 wt% boron nitride (BN) and molybdenum disulfide (MoS2) nanoparticles with nominal size of 70 and 50 nm, respectively. The formulations were tested using cast iron cylinder liner segments reciprocating against aluminum alloy piston skirt segments at 20, 40, and 100 °C. The results showed that, at a load of 250 N and a reciprocating frequency of 2 Hz, BN did not lower friction whereas MoS2 nanoparticles were very effective at reducing both friction and wear, compared with the base oil. The viscosities of both formulations were similar to the base oil, which allowed for a direct comparison between them. Raman spectroscopy showed the formation of an aligned MoS2 layer on the cast iron liner surface, which most likely functions as a tribofilm. In the case of the cast iron liner tested with BN nanolubricant, no traces of BN were found. The effect of surfactants was also studied, and it was found that some surfactants were not only beneficial in dispersing the nanoparticles in oil, but also in producing some reduction in friction and wear, even when used as stand-alone additives in PAO 10.
So NB - sucks, MOS2 - cool
It seems, a major reason why no wide implementation of this solid/nano things. A. solid thing, who knows .... B. result vary - up to negative, due to diff. measure technique, tested substance, environments factors. e.t.c.
Know some person who mix all this thing by itself, ordering it over private lab and fill in own 10y.o. MB. "you fill a difference-it works" like that....
Did use LM flush 10 min one, replace oil to Pennzoil yellow, and car feels less responsive, dive 2 weeks, then give up, tossed can mos2 - better now. my coworker fill indifference after can mos2. (after flush use, the oil get dark after 1.5K km, dumped, then 0W40 M1, same 1.5K - very clean. seem many noticed flush working after usage in some degree)
Tribology Letters July 2012, Volume 47, Issue 1, pp 91-102
Date: 08 May 2012
Tribological Effects of BN and MoS2 Nanoparticles Added to Polyalphaolefin Oil in Piston Skirt/Cylinder Liner Tests
Nicholaos G. Demas, Elena V. Timofeeva, Jules L. Routbort, George R. Fenske
Abstract
We report in this article the friction and wear results of polyalphaolefin (PAO 10) base oil with the addition of 3 wt% boron nitride (BN) and molybdenum disulfide (MoS2) nanoparticles with nominal size of 70 and 50 nm, respectively. The formulations were tested using cast iron cylinder liner segments reciprocating against aluminum alloy piston skirt segments at 20, 40, and 100 °C. The results showed that, at a load of 250 N and a reciprocating frequency of 2 Hz, BN did not lower friction whereas MoS2 nanoparticles were very effective at reducing both friction and wear, compared with the base oil. The viscosities of both formulations were similar to the base oil, which allowed for a direct comparison between them. Raman spectroscopy showed the formation of an aligned MoS2 layer on the cast iron liner surface, which most likely functions as a tribofilm. In the case of the cast iron liner tested with BN nanolubricant, no traces of BN were found. The effect of surfactants was also studied, and it was found that some surfactants were not only beneficial in dispersing the nanoparticles in oil, but also in producing some reduction in friction and wear, even when used as stand-alone additives in PAO 10.
So NB - sucks, MOS2 - cool
It seems, a major reason why no wide implementation of this solid/nano things. A. solid thing, who knows .... B. result vary - up to negative, due to diff. measure technique, tested substance, environments factors. e.t.c.
Know some person who mix all this thing by itself, ordering it over private lab and fill in own 10y.o. MB. "you fill a difference-it works" like that....
Did use LM flush 10 min one, replace oil to Pennzoil yellow, and car feels less responsive, dive 2 weeks, then give up, tossed can mos2 - better now. my coworker fill indifference after can mos2. (after flush use, the oil get dark after 1.5K km, dumped, then 0W40 M1, same 1.5K - very clean. seem many noticed flush working after usage in some degree)
