Measurement and analysis of wax-oil gel scraping process at contact area under pure sliding conditions

Tribological properties of wax-oil gel mixture during gel-scraping process have been experimentally investigated for hard contact based on optical fluorescence. A test facility was designed and adapted to deposit-scraping. A wax-oil gel mixture of commercial wax and white-oil is prepared from different wax-contents. The results indicated that the relative angle (λ) of outlet region in gel-scraping process increases as sliding speed increases, and the gel-scraping process is dependent on the force balance of wax-deposit. Experimental results also show that presence of higher wax-content increased the complexity of gel-scraping operations. Theoretical models were proposed for analyzing the tribological mechanism in scraping-process.