2000 rpm 003 sec per cycle

Vapor Phase Oxidation Stability

The carrier gases for vapor-delivered lubrication may include inert materials such as N2 and CO2. In addition, air or exaust gas from the internal combustion engine may be used as the carrier gas. A significant factor in vapor-delivered lubricants concerns the stability of the lubricant in the gas phase. Since oxidation generally occurs at a lower temperature than thermal degradation, these oxidative effects should be considered. Since oxidation in the liquid phase attacks at a C-G bond, a typical hydrocarbon has been used to evaluate vapor phase oxidation up to 500°C. In the vapor state mixed with air or oxygen, the hydrocarbons tend to form cyclic ethers as indicated in Figure 5 (20,21). Carbon chain thermal degradation is minimized below 500°C as long as the hydrocarbon and cyclic ether remain in the vapor phase. This information is important for the vapor delivery system where oxygen may be a component of the delivery system. Obviously, care must be taken to keep the oxygen content of the carrier gas low enough to prevent combustion to CO2 and water. The cyclic ethers result where the oxygen content is limited to one oxygen molecule per hydrocarbon molecule. The data on Figure 5 apply to isothermal conditions in the temperature range shown.

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