PaintSquare.com
Follow us on Twitter Follow us on LinkedIn Like us on Facebook Follow us on Instagram Visit the TPC Store
Search the site

 

Advertisement

PaintSquare


Coatings Industry News

Main News Page


MIT Research Could Impact Spray Coatings

Wednesday, September 27, 2017

Comment | More

New research from a Massachusetts Institute of Technology team regarding droplet behavior could, the scientists say, have implications for how some coating spray application is performed.

The findings note that when droplets come in contact with a surface, thermal properties of the surface have an impact on the droplets’ behavior, meaning that surfaces can be tuned to meet the exact needs of a given application, according to MIT.

Droplet Adhesion

MIT’s findings regarding the thermal properties of a surface were recently published in Nature Physics, authored by MIT associate professor of mechanical engineering Kripa Varanasi, along with former postdoctoral scholar Jolet de Ruiter and and current postdoctoral scholar Dan Soto.

In the study, the team looked at the properties of droplets of molten metal freezing onto different surfaces, namely silicon and glass. Traditional assumptions would point in the direction of the droplets behaving the same way on both surfaces, but the researchers’ findings proved otherwise.

“We had two substrates that had similar wetting properties [the tendency to either spread out or bead up on a surface] but different thermal properties,” Varansi noted.

Varanasi Group/MIT

Researchers based out of the Massachusetts Institute of Technology have discovered that, when droplets come in contact with a surface, thermal properties of the surface have an impact on the droplets’ behavior.

Silicon’s heat-conducting properties led to the molten metal just falling off, whereas the insulating properties of glass allowed the metal droplets to stick.

By controlling the thermal properties of a given surface, the adhesion of a freezing droplet can be controlled, Varansi noted, adding that this provides “a whole new approach” in determining liquid-surface interactions.

Experimenting with Molten Metal

In experimenting with molten metal, researchers were working with an element that is used in some thermal spray coatings for turbine blades or machine parts. The key to coating uniformity and quality lies in how well each droplet adheres to the surface.

“The way droplets impact and form splats dictates the integrity of the coating itself. If it’s not perfect, it can have a tremendous impact on the performance of the part, such as a turbine blade,” Varanasi said. “Our findings will provide a whole new understanding of when things stick and when they don’t.”

New insights gleaned from this research could help with prevention of droplets sticking, which is imperative for airplane wings in icy weather. According to MIT, this could also lead to the cleaning and waste management of thermal spray processes and additive manufacturing.

The team concluded that changing the thermal properties of the substrate, as well as the temperatures of both the droplets and substrate, have a direct impact on the degree to which the droplets of most any liquid will stick.

“We can imagine scenarios where thermal properties can be adjusted in real time through electric or magnetic fields," Soto said, "allowing the stickiness of the surface to impacting droplets to be adjustable.”

   

Tagged categories: Coatings Technology; Colleges and Universities; Massachusetts Institute of Technology; Research; Research and development; Spray systems

Comment from peter gibson, (9/27/2017, 10:46 AM)

Droplets/splats....really. These guys have a lot of time on their hands.Not useful at all.


Comment from Tom Schwerdt, (10/2/2017, 8:31 AM)

Knowing what factors affect how thermal spray bonds to a surface is quite important to anyone involved with thermal spray.


Comment Join the Conversation:

Sign in to our community to add your comments.

Advertisements
 
SABRE Autonomous Solutions
 
Repeatability
 
The ALPHA1 provides reliable results consistently allowing you to cost your next job with confidence.
 

 
Detail Masters
 
Overspray Removal
 
We offer professional, turnkey service and unparalleled quality!
Our process can save hundreds— even thousands of dollars. It's fast, environmentally safe and 100% guaranteed.
 

 
SEMicro Division, M.E. Taylor Engineering, Inc.
 
Coatings Adhesion Testers
 
The PATTI® accurately measures the bond strength between coating & substrate. Outfitted properly, the surface can be rough, porous, or curved & >10K psi strong!
 

 
Tarps manufacturing, Inc.
 
QUALITY MADE IN AMERICA —Available near you!
 
CLICK to get a behind-the-scenes look at how Tarps Manufacturing makes the highest-quality tarps right here in the USA — available nationwide.
 

 
ARC / A.W. Chesterton Company
 
Superior Impact & Wear Resistant Lining
 
100% solids, impact resistant, ceramic reinforced, epoxy/urethane hybrid lining for severe abrasive wear and impact resistance.
 

 
HoldTight Solutions Inc.
 
NO FLASH RUST - NO CONTAMINANTS
 
Our HoldTight®102 salt remover & flash rust
preventer prevents flash
rust by removing surface contaminants. Contact us
for your nearest distributor.
(800) 319.8802 sales@holdtight.com
 

 
Mitsubishi Gas Chemical America
 
Performance Amine 1,3-BAC
 
A highly reactive cycloaliphatic diamine offering superior performance. Reasonable cost and curing efficacy makes it suitable for all types of epoxy resin applications.
 

 
SSPC: The Society for Protective Coatings
 
http://www.sspc.org/
 
Join SSPC and Enhance
Your Career !
 

 
US Minerals
 
Hit Harder. Clean Faster.
 
Black Diamond abrasive products are the toughest, most effective blasting media and supply the superior power you need to get any job done.
 

 
BASF
 
New resins from BASF will have metals loving water!
 
Excellent corrosion resistance, low VOC, high gloss, thin films www.basf.us/industrialcoatings dpsolutions@basf.com 800-231-7868
 

 
 
 

Technology Publishing Co., 1501 Reedsdale Street, Suite 2008, Pittsburgh, PA 15233

TEL 1-412-431-8300  • FAX  1-412-431-5428  •  EMAIL webmaster@paintsquare.com


The Technology Publishing Network

Durability + Design PaintSquare the Journal of Protective Coatings & Linings Paint BidTracker

 
EXPLORE:      JPCL   |   PaintSquare News   |   Interact   |   Buying Guides   |   Webinars   |   Resources   |   Classifieds
REGISTER AND SUBSCRIBE:      Free PaintSquare Registration   |   Subscribe to JPCL   |   Subscribe to PaintSquare News
MORE:      About PaintSquare.com   |   Privacy policy (Updated 1/8/2018)   |   Terms & conditions   |   Site Map   |   Search   |   Contact Us