Self-Lubricating Materials for High Temperature Ring/Cylinder Application

Exploring the Pathway to High Efficiency IC Engines through Exergy Analysis of Heat Transfer Reduction

“…This problem is compounded by the fact that many high-temperature lubricants cannot be pumped by conventional means at ambient temperatures, making lubrication during startup an issue. Research in selflubricating composites by Sutor [14], Gaydos [15], and others demonstrate some promise in solid lubrication, but lubrication of hot surfaces remains a significant issue. It is important to note that engines with conventionally cooled liners avoid this problem, and can still use typical engine lubricants, rings, etc.…”

“…14 Thus it is desirable to perform as much of the expansion as possible within the cylinder, while the remaining expansion is still accomplished in a turbine. 15 In the case analyzed, the expansion ratio was set to 1.4 times the compression ratio, the same as used in the Honda EXlink [18] stationary power engine. Once again, the turbo-compounded backpressure was set to maximize the total work.…”

An Optimized Low Heat Rejection Engine for Automotive Use - An Inceptive Study

“…Significant research efforts have been undertaken by Adiabatics Inc., et al [18,19], the Midwest Research Institute [20], and Battelle. [21,22,23] Recent work done by Battelle [24] describes the successful application of a well known "Boes" compact to temperatures of 850 o C. [25,26] The NASA Lewis Research Center has shown the effectiveness of coatings of some oxides and fluorides to 900 o C. [27,28] Nickel/molybdenum-bonded titanium carbide cermets [29] and nickel/molybdenumbonded chromium carbide cermets [30] have also shown to be effective. Additional research must be directed toward the development of the most promising materials.…”

Tribological Comparison of Traditional and Advanced Firearm Coatings

“…Experiments were conducted for automotive engine applications with a number of proprietary composite coatings, all of which resulted in high friction and shear stresses resulting in edge chipping and large fractures. (35) Today, to this end, we still use traditional methods or develop a surface layer with various properties which is later tested in different conditions, first in the laboratory, next in the industry, to finally determine its range of applications. It is only in very rare cases that the opposite order is practiced.…”

“…Solid lubricants have been tested in the early 1990's for use in automobile engines, and demonstrated to have coefficients of friction that were close to a properly lubricated metallic interface, but a wear rate that is two to three orders of magnitude higher. (35) Alas, the mechanical stresses in an engine were too high for these undeveloped solid lubricants.…”