News

News

Ultra-lightweight Ceramic Material Withstands Extreme Temperatures

Date: 2019-02-21
Views: 163

UCLA researchers and collaborators at eight other research institutions have created an extremely light, very durable ceramic aerogel. The material could be used for applications like insulating spacecraft because it can withstand the intense heat and severe temperature changes that space missions endure.


Ceramic aerogels have been used to insulate industrial equipment since the 1990s, and they have been used to insulate scientific equipment on NASA's Mars rover missions. But the new version is much more durable after exposure to extreme heat and repeated temperature spikes, and much lighter. Its unique atomic composition and microscopic structure also make it unusually elastic.


When it's heated, the material contracts rather than expanding like other ceramics do. It also contracts perpendicularly to the direction that it's compressed -- imagine pressing a tennis ball on a table and having the center of the ball move inward rather than expanding out -- the opposite of how most materials react when compressed. As a result, the material is far more flexible and less brittle than current state-of-the-art ceramic aerogels: It can be compressed to 5 percent of its original volume and fully recover, while other existing aerogels can be compressed to only about 20 percent and then fully recover.


The research, which was published today in Science, was led by Xiangfeng Duan, a UCLA professor of chemistry and biochemistry; Yu Huang, a UCLA professor of materials science and engineering; and Hui Li of Harbin Institute of Technology, China. The study's first authors are Xiang Xu, a visiting postdoctoral fellow in chemistry at UCLA from Harbin Institute of Technology; Qiangqiang Zhang of Lanzhou University; and Menglong Hao of UC Berkeley and Southeast University.


Other members of the research team were from UC Berkeley; Purdue University; Lawrence Berkeley National Laboratory; Hunan University, China; Lanzhou University, China; and King Saud University, Saudi Arabia.


Despite the fact that more than 99 percent of their volume is air, aerogels are solid and structurally very strong for their weight. They can be made from many types of materials, including ceramics, carbon or metal oxides. Compared with other insulators, ceramic-based aerogels are superior in blocking extreme temperatures, and they have ultralow density and are highly resistant to fire and corrosion -- all qualities that lend themselves well to reusable spacecraft.


But current ceramic aerogels are highly brittle and tend to fracture after repeated exposure to extreme heat and dramatic temperature swings, both of which are common in space travel.


The new material is made of thin layers of boron nitride, a ceramic, with atoms that are connected in hexagon patterns, like chicken wire.


In the UCLA-led research, it withstood conditions that would typically fracture other aerogels. It stood up to hundreds of exposures to sudden and extreme temperature spikes when the engineers raised and lowered the temperature in a testing container between minus 198 degrees Celsius and 900 degrees above zero over just a few seconds. In another test, it lost less than 1 percent of its mechanical strength after being stored for one week at 1,400 degrees Celsius.


'The key to the durability of our new ceramic aerogel is its unique architecture,' Duan said. 'Its innate flexibility helps it take the pounding from extreme heat and temperature shocks that would cause other ceramic aerogels to fail.'


Ordinary ceramic materials usually expand when heated and contract when they are cooled. Over time, those repeated temperature changes can lead those materials to fracture and ultimately fail. The new aerogel was designed to be more durable by doing just the opposite -- it contracts rather than expanding when heated.


In addition, the aerogel's ability to contract perpendicularly to the direction that it's being compressed -- like the tennis ball example -- help it survive repeated and rapid temperature changes. (That property is known as a negative Poisson's ratio.) It also has interior 'walls' that are reinforced with a double-pane structure, which cuts down the material's weight while increasing its insulating abilities.


Duan said the process researchers developed to make the new aerogel also could be adapted to make other ultra-lightweight materials.


'Those materials could be useful for thermal insulation in spacecraft, automobiles or other specialized equipment,' he said. 'They could also be useful for thermal energy storage, catalysis or filtration.'


Via: https://www.sciencedaily.com


News / Recommended news More
2020 - 05 - 14
MIM is currently the most scientific near net shape forming technology for metal parts formation. It can flexibly adjust to various performance indexes and has been successfully applied to popular areas such as auto parts, 3C digital, medical equipment and tool locks. Hence, traditional molding technologies such as CNC fine processing, to some extent, are being replaced. Although the future of MIM...
2020 - 05 - 14
The East China Powder Metallurgy Technology Exchange Meeting, rotationally presented by the powder metallurgy societies in East China, has been successfully held for 17 years since 1982. It’s considered as one of the important platforms for China's powder metallurgy industry exchanges, and has actively promoted the flourishing development of the industry and related industries in East China and ev...
2020 - 05 - 14
Ceramic 3D printing can be used in preparation of multifunctional ceramics with complex structure and high precision, and will be widely used in architecture, engineering, medicine, aerospace and more. In recent years, metal and plastic 3D printing companies is shifting to the ceramic materials field that has increasing demand for strong, tough and high temperature resistant parts, which promotes ...
2020 - 05 - 07
Scientists in the University of Maryland (UMD)'s Department of Materials Science and Engineering (MSE) have reinvented a 26,000-year-old manufacturing process into an innovative approach to fabricating ceramic materials that has promising applications for solid-state batteries, fuel cells, 3D printing technologies, and beyond.Ceramics are widely used in batteries, electronics, and extreme environm...
Share:
Uniris Exhibition Shanghai Co., Ltd.
Shanghai Branch
Tel: 4000 778 909 
E-mail:irisexpo@163.com

Guangzhou Branch
Tel: 020-8327 6389
E-mail:iacechina@unifair.com

IACE CHINA Official Website
犀牛云提供企业云服务
犀牛云提供云计算服务
Scan