Rapid ceramic-metal processing superior composites

Quick ceramic-metal processing technology for superior composites

10:53 AM, 20th January 2017
Quick ceramic-metal processing technology for superior composites
New rapid and efficient technology that enables processing ceramics and metals together into cermets with little to no reaction between constituent materials.

COLLEGE STATION, US: Recent advancements in automotive, aerospace and power generation industries have inspired materials scientists to engineer innovative materials. Ceramic-metal composites or cermets are an example of a new and improved class of materials that can enhance transportation and energy conversion technologies.

Cermets combine useful properties from each of their primary constituent materials such as high-temperature stability of ceramics and machinability and ductility of metals. However, cermets are effective only if their constituent materials do not react with each other during their processing.

Researchers at Texas A&M University have developed a rapid and efficient technology that enables processing ceramics and metals together into cermets with little to no reaction between constituent materials. This breakthrough opens the possibilities for development of new and superior composite materials.

Most ceramics and metals are unstable when combined at high temperatures and are known to react with each other, leaving the final composite materials with undesirable properties such as brittleness or low-temperature resistance.

“This severely limits the number of new composite materials that can be developed for our growing needs,” said Dr Miladin Radovic, associate professor and associate department head in the department of materials science and engineering.

The research is published in the journals Scientific Reports.

Radovic along with Dr Ibrahim Karaman, Chevron Professor I and head of the materials science and engineering department, and former doctoral students Dr Liangfa Hu and Dr Ankush Kothalkar, and Morgan O’Neil, an undergraduate student in the department of mechanical engineering, have developed the current-activated pressure-assisted infiltration (CAPAI) method to combine ceramics and metals resulting in stable, high performance composites.

In only nine seconds, the CAPAI method combines ceramics and metals with little to no reaction between constituent materials. It uses electric current to instantly heat the metal and applied pressure to drive the molten metal into foam made of ceramic.

In their primary study, the researchers selected aluminium for its light weight, corrosion resistance and popularity in automotive and aerospace industries, and ceramic foams of titanium aluminium carbide (Ti2AlC) for their good fracture toughness, electrical and thermal conductivity, and combined them into lightweight cermets with high strength and good temperature stability.

“The electric current and the pressure together provided simultaneous heating and pressure that actively drove the molten metals into the ceramic preform. The fast and controllable heating rate, which was as high as 700 degrees Celsius, offered an easy and efficient way to avoid reactions between ceramics and molten metal,” said Radovic.

The researchers discovered that the resulting composite (Ti3AlC3/Al) was lightweight with competitive mechanical properties at both ambient (room) temperatures and elevated temperatures. It was 10 times stronger at room temperatures and 14 times stronger at 400 degrees Celsius than aluminium alloys and was less prone to severe degradation after exposure to high temperatures.

“Both aluminium and titanium aluminium carbides challenged the conventional methods for producing desirable composite materials because they react to each other at a temperature that is well beyond that needed to combine them in the composite material,” added Radovic. “The CAPAI method allowed processing novel ceramic-metal composites which could not otherwise be obtained using powder metallurgy and conventional infiltration techniques.”

Radovic is optimistic about the limitless opportunities that new and advanced composite materials will offer for both economical and sustainable manufacturing on an industrial scale.

The research was funded by US Air Force Office of Scientific Research, Multidisciplinary Research Program of the University Research Initiative (MURI).

© Texas A&M University News 

0 Comments

Login

Your Comments (Up to 2000 characters)
Please respect our community and the integrity of its participants. WOC reserves the right to moderate and approve your comment.

Related News


Martin Pugh to retire as COO of Trinseo

BERWYN, US: Trinseo, a global materials company said that Martin Pugh, currently the executive vice president and chief operating officer (COO), will ...

Read more
OMC: A new material to trap radioactive elements from water

HOUSTON, US/ KAZAN, RUSSIA: Researchers at Rice University and Kazan Federal University (KFU) in Russia have found a way to extract radioactivity from ...

Read more
US Water names current VP as its new CEO

ST MICHAEL, US: US Water Services Inc, a wholly owned subsidiary of Allete Inc has named current senior executive vice president of marketing and stra ...

Read more
New method could enhance drug discovery, protein study

LA JOLLA, US: A team led by scientists at The Scripps Research Institute (TSRI) has developed a versatile new method that would enhance the discovery ...

Read more
PPG appoints current VP as its new chief financial officer

PITTSBURGH, US: PPG Industries Inc has appointed current vice president, finance, Vincent Morales as its new senior vice president (VP) and chief fina ...

Read more
Blood-repellent materials: A new tactic to medical implants

FORT COLLINS, US: Medical implants like stents, catheters and tubing introduce risk for blood clotting and infection – a perpetual problem for m ...

Read more
www.worldofchemicals.com uses cookies to ensure that we give you the best experience on our website. By using this site, you agree to our Privacy Policy and our Terms of Use. X