Aluminum Nitride to Extend Durability of Solar Stations

Date: 2018-12-11
Views: 127

Research group, consisting of scientists from Central Metallurgical R&D Institute (Cairo) and National University of Science and Technology MISIS (Moscow) have developed a composite material that can extend the durability of solar towers - stations that collect thermal energy of the Sun - from 2-3 to 5 years. The article on the research is published in Renewable Energy.

Aluminum Nitride to Extend Durability of Solar Stations

This is a typical solar power tower (PRNewsfoto/NUST MISiS)

Photovoltaic power stations (PV systems) are becoming more and more popular, as they allow to collect and recycle thermal energy of the Sun on industrial scale. Among the most promising types of PV systems are solar towers. Solar tower is a high construction with water tank and turbine system inside. The tower is surrounded by heliostats - big rotating mirrors that capture the sunlight and concentrate it in one point on the tower as a giant light beam. The beam reaches the receiver (heat-absorbing element), which, in its turn, heats liquid sodium up to 600°C. This temperature heats the neighboring water tank, and the steam spins the turbines of the station.

Traditionally, for the receivers SiC (silicon carbide) is used: it is porous, highly dense, durable, and resistant to oxidation. However, SiC has some disadvantages: for instance, it is sensitive to aggressive environment of liquid sodium.

A promising addition to SiC is AlN (aluminum nitride), which has high thermal conductivity, low thermal expansion coefficient and high heat resistance. Now SiC/AlN composites are used mainly in electronics, but can potentially be used in different spheres, including solar energy.

Scientists from Central Metallurgical R&D Institute (CMRDI) (Cairo) together with scientists from National University of Science and Technology MISIS (NUST MISIS) (Moscow) have developed porous composites based on SiC/AlN, containing up to 40% of AlN. In the process of the work, the optimal compositions of additives and sintering regimes of new composites were selected, which significantly exceed the traditional ones due to the formation of a solid solution at the grain boundaries of silicon carbide. Along with high thermal conductivity and heat resistance, such composites have a low coefficient of thermal expansion, which significantly improves their performance.

"The volumetric air receiver based ceramics is a hot topic in these days because the solar energy trend needs long term materials without defects, - the Head of the research team from the Egyptian side, Head of Refractory & Ceramic Materials Division of CMRDI, Dr. Emad Ewais comments. - The further prospects lay is testing of the composite in the solar furnace to evaluate its efficiency as volumetric air receiver".

Due to good thermochemical and thermomechanical properties, SIC/AlN composites are also promising for use in other high-temperature fields, such as metallurgy and aerospace engineering.

SOURCE The National University of Science and Technology MISiS

News / Recommended news More
2019 - 09 - 11
Engineers at the University of California, San Diego have developed a process for welding ceramics that could have wide-ranging implications for the hardiness and construction of electronics.According to a paper published in Science on August 23rd,, UC-San Diego researchers have used a sub-50-watt, rapidly-pulsing laser to melt and fuse ceramics, upending traditional ceramics welding met...
2019 - 09 - 06
Researchers have found a way to use 3D printing to stretch and flatten twisted polymers so that they conduct electricity better. The researchers, led by chemical and biomolecular engineers from the University of Illinois at Urbana-Champaign, report their findings.Conjugated polymers are formed from the union of electron-rich molecules along a backbone of alternating single and double chemical bond...
2019 - 08 - 28
We live in a ceramic world. Ceramics are everywhere even in the world of engineering. The most important and general property of ceramics is that they are refractory. What does this mean? They are “rough-and-tumble” materials that will take large amounts of abuse in a wide range of situations. Ceramic tiles are used for space shuttles. The composite is able to withstand tremendous temperature...
2019 - 08 - 21
Samples of the new ceramic aerogel, which is incredibly lightweight and can withstand intense heat fluctuations(Credit: Oszie Tarula/UCLA)Ceramic aerogels have been protecting industrial equipment and space-bound scientific instruments for decades, thanks to their incredible lightness and ability to withstand intense heat. The problem is they can be pretty brittle. Now, a team led by research...
Uniris Exhibition Shanghai Co., Ltd.
Shanghai Branch
Tel: 4000 778 909

Guangzhou Branch
Tel: 020-8327 6389

IACE CHINA Official Website