Liquid Gases Aromatics

Wear Behavior of High Temperature Lubricants

All of the lubricant types shown on Table 5 have been evaluated at Penn State as vapor delivered lubricants. Deposition tests over the range of 400°C to 850°C have been carried out in tubular ovens on various metal substrates and quartz. These lubricants have also been evaluated in a four-ball wear tester at 375°C using vapor delivered lubricants and up to 600°C in the ALCOA spin tester using predeposit-ed vapor delivered films (22,24). The data obtained show that all of the lubricants discussed have potential for this temperature range as vapor-delivered lubricants. For this paper, the results will be illustrated with deposition data for TCP on stainless steel and for wear values using TCP on M50 tool steel balls in the four-ball wear tester. The deposit rate as a function of time for 1.55 mol percent TCP in nitrogen carrier gas is shown on Figure 6 for a series of temperatures. The deposit scale is micrometers per square centimeter which can be converted to monolayers by multiplying by 10.. That is, the deposit scale represents 0 to 5000 monolayers of deposit. It is clear from the data that the 300 series stainless steel wire has a strong catalytic effect on the deposit rate of the TCP. In fact, EDAX analysis of the coating shows a substantial amount of iron mixed with the

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