scholarly journals IR Imaging of Solid Lubricant Coatings on Concealed/Disjointed Surfaces for Transparent Polymer Delivery Device Applications

Sensors ◽  
2020 ◽  
Vol 20 (22) ◽  
pp. 6408
Author(s):  
Anton Walsh ◽  
Natalia Rebrova ◽  
Steven Darby ◽  
Killian Barton ◽  
Raymond Wolfe ◽  
...  

Transparent polymer delivery devices often contain a solid lubricant coating on a stronger bulk polymer. The distribution of lubricant coating must be monitored for device optimisation appraisals and to ensure consistency during mass production. However, coating evaluation is difficult to perform as surfaces are often concealed and/or disjointed. Dye stain analysis, which is destructive and time-consuming, is the current industry standard. We present a prototype IR transmission microscope to evaluate micron-level coating coverage of polyurethane and/or polyvinylpyrrolidone on a poly(propylene)-based delivery device. The device has a common industrial configuration, containing a duct and bevel. Inferred absorption of the coating was used to identify coating coverage and a multivariate analysis was used to remove the effects of absorption and scattering by the bulk. Coverage on concealed and disjointed surfaces was imaged and evaluated from a single camera viewpoint and ≈50 μm defects were detectable. The industrial applicability of the prototype was demonstrated using comparisons with dye stain analysis by estimating water dilution of coating and identifying artifacts in coating, which may indicate machine malfunction. The sensitivity and speed of the IR technique makes it a favourable alternative to the current industry standard.

2020 ◽  
Vol 2020 (4) ◽  
pp. 4164-4169
Author(s):  
Alexander Shmatov ◽  
Lubomir Soos ◽  
Zdenko Krajny

Author(s):  
Hooshang Heshmat ◽  
James F. Walton ◽  
Michael J. Tomaszewski

Recent tests demonstrated successful operation of a turbojet engine with a compliant foil air bearing using a new high-temperature solid lubricant coating. The hot section rolling element bearing and corresponding lubrication system were replaced with a compliant foil air bearing using a composite solid lubricant coating capable of operating at temperatures well above 650°C (1200°F). Detailed engine integration studies, bearing component rig testing and hot engine simulator tests were completed prior to the successful engine test. The rig and simulator tests verified high temperature capabilities of the bearing and its surface coating, the bearing journal design, bearing dynamic performance, and rotor-bearing system dynamic stability, prior to engine integration and test. Based on these preliminary efforts, the engine and bearing were assembled and tests were conducted that included over 70 start stop cycles (including hot restarts), seven simulated mission cycles and more than 14 hours of run time. The foil bearing and engine operated flawlessly throughout the test. Vibrations were very low and all temperatures and pressures were as expected. The post-test inspection revealed that the bearing, journal and coating were all in excellent condition.


2016 ◽  
Vol 60 (2) ◽  
pp. 217-225 ◽  
Author(s):  
Ming-xue Shen ◽  
Zhen-bing Cai ◽  
Jin-fang Peng ◽  
Xu-dong Peng ◽  
Min-hao Zhu

Author(s):  
Vladimir Ivanov ◽  
Sergey Popov ◽  
Julianna Marchenko ◽  
Edward Marchenko ◽  
Nikolai Dontsov ◽  
...  

2005 ◽  
Vol 18 (1) ◽  
pp. 119-124 ◽  
Author(s):  
N.L. McCook ◽  
D.L. Burris ◽  
G.R. Bourne ◽  
J. Steffens ◽  
J.R. Hanrahan ◽  
...  

2010 ◽  
Vol 148-149 ◽  
pp. 728-731
Author(s):  
Suo Xia Hou ◽  
Xiao Ming Jia ◽  
Chao Wu

The main factors that affect properties of solid lubricant coating on high-speed steel surface are the surface roughness and the weight of phosphate coating. The effect of magnetic field on high speed steel phosphate process is significant. It promotes the film and the different appearance and composition of the film. Because the ferric phosphate and dihydric phosphate in phosphate solution may be ordered arrangement by additional magnetic field, they can be deposited on metal surfaces quickly. That is to say that a certain intensity of the magnetic field can reduce the entropy of the phosphate processing system and speed up the formation of phosphate film. During phosphate treatment, the friction performance of high-speed steel coated with solid lubricant coating was significantly improved.


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