TAGS: Smart Coatings Industrial Coatings
A group of scientists at the International Advanced Research Centre for Powder Metallurgy & New Materials (ARCI), an autonomous R&D center of the Department of Science & Technology (DST) have developed a process for size-selective deposition of nanocomposite coatings which can wear and friction of these dynamic systems.
Excellent Combination of Wear and Corrosion Resistance
The scientists have found that nickel tungsten-based coatings with impregnation of particular sized Silicon Carbide (SiC) submicron particles using an economical and straightforward pulsed electroplating or electrodeposition process can provide an excellent combination of wear and corrosion resistance with the low friction coefficient and good oil retention capacity.
The coatings developed by the ARCI group reduced friction more and could withstand corrosion due to salt spray better than many similar wear-resistant coatings available in the market.
The coating could address the emerging need for coatings with low friction and wear. Nanocomposite coatings with hard particles inside a tough matrix result in the best combination of wear resistance and reduced friction. However, the size of reinforcement particles is a critical factor in deciding the friction characteristics. Too much variation in the size of reinforcement particles in composite coating results in premature failure of the coating due to stress concentration.
Nanocomposite with Excellent Tribological Behavior
The nanocomposite demonstrated excellent tribological behavior (science and engineering of interacting surfaces in relative motion, which includes principles of friction, lubrication, and wear) compared to other wear-resistant coatings such as NIKASIL (trademarked electrodeposited Nickel matrix Silicon Carbide) and hard chrome.
These new coatings withstood 1000 hours of salt spray (corrosion) without degradation when compared to conventional wear-resistant coatings like hard chrome used in the automobile industry. The performance of new coatings was better in as-deposited condition itself. However, the wear performance can further be improved (doubled) when composite coatings are post heat treated.
Many opportunities and application avenues are available for such nanocomposite coatings, including aerospace, automotive, and space sectors, where wear and corrosion are main problems. The process is highly economical without environmental constraints. The process has been patented and is ready for commercialization through the industry.
Source: ARCI