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Product Code: ICA13_1604

Laser Cleaning of Carbonaceous Deposits on Combustion Engine Components
Yingchun Guan, Singapore Institute of Manufacturing Technology; Singapore Singapore
Chih-Hsing Liu, Singapore Institute of Manufacturing Technology; Singapore Peoples Republic of China
Gnian Cher Lim, Singapore Institute of Manufacturing Technology; Singapore Singapore
Hong Yu Zheng, Singapore Institute of Manufacturing Technology; Singapore Singapore
Ming Hui Hong, National University of Singapore; Singapore Singapore
Presented at ICALEO 2013

Stubborn carbonaceous deposits on combustion engine components are known to reduce engine durability and performance. The deposits are extremely hard and difficult to remove. Laser cleaning technique may potentially be used to remove these deposits during engine remanufacturing but is rarely reported. In the present work, we demonstrated the feasibility of using a nano-second pulse width and high peak power laser with homogenised beam profile at 1064 nm wavelength to completely remove carbon deposits from steel and aluminium pistons. This one-step process without use of chemicals or any other additives is environmentally friendly and may be carried out with high efficiency in open air. Surfaces before and after laser cleaning were examined using FTIR, XPS, SEM/EDS, and XRD to identify changes in chemical analysis, morphology and residual stress. Cross-sectional microstructures of the laser cleaned regions were investigated to reveal any heat affected zone. Some thermal melting and removal of base materials were found to occur but could be minimised with optimised process parameters.

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