Four Ball Wear At 10kq And 30

TCP AT 370 C UOUD LUBE AT 79 C ■ maM mm 1« rsm iow ezzaa» 11—i uto


Figure 9


Figure 9

cants tested at the same load with 10 ml of liquid at 75°C. These data show that the optimum TCP vapor concentration gives less wear at 375°C than a fully flooded 75°C test with an SF-CD automotive lubricant. The low concentration TCP vapor phase run gives wear comparable to a good industrial EP lubricant. The last liquid lubricant in the comparison is a typical 30 weight oil with rust and oxidation protection. These data show clearly that the vapor deposited films from TCP vapor at 375°C are indeed good lubricating materials.


Conventional engine lubrication today uses recirculating liquid lubricated systems. As the temperature increases, these systems produce excessive deposits. The use of state-of-the-art solid lubricants without a continuous replenishing system falls several orders of magnitude short of the wear coefficient now achieved in engines. Unlubricated ceramics similarly fall several orders of magnitude short of the goal of engine wear life achieved in current engines.

Many conventional lubricants form lubricating films in the range of 300 to 1600°C. To use these materials as continuously supplied lubricants, care must be taken to supply them at a low enough rate to prevent an excess of deposit build up in the vicinity of the bearing. The possibility of three-body wear is suggested from the formation of excess deposit.

Many lubricants appear to be stable enough and volatile enough for delivery to high-temperature bearings in inert carrier gases. Many of these lubricants can also be carried effectively with gases containing some oxygen. When the rate of deposit in the bearing area is controlled, excellent wear characteristics result from vapor-phase high-temperature lubrication.

Many lubricants can react catalytically with or on bearing surfaces. Metals show more catalytic action than some more inert materials such as quartz. It is necessary to test the actual lubricant-carrier gas-bearing material couple to determine the chemistry that will occur at high temperatures.


The author wishes to acknowledge the Department of Energy, Energy Conservation and Utilization Technologies for the financial support of some of the research reported on in this paper.


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