Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Scientists predict a new superhard material with unique properties

18.06.2018

Chemists from Russia and China have predicted a new superhard material that can be used in drilling, machine building and other fields. The new tungsten boride they discovered outperforms the widely used 'pobedit' ? a hard tungsten carbide and cobalt composite material with artificial diamond interspersing. The results of their study were published in the reputable scientific journal, The Journal of Physical Chemistry Letters.

Superhard substances have a broad scope of application spanning well drilling, machine building, metalworking, defense industry, surgery and many other fields. The hardest known material, diamond is an unaffordable luxury in many applications.


This is a schematic caption of new material's structure.

Credit: Alexander G. Kvashnin et al./The Journal of Physical Chemistry Letters

Its distant competitor, pobedit, has remained unrivaled for the last 80 years. Developed in the 1930s, it was used during the Second World War to make anti-tank shell caps (the word 'pobedit' is actually derived from the Russian 'pobeda' which means victory) and has been used for decades to manufacture drill bits for the drilling rigs. Harder materials either require higher-pressure synthesis or have much lower fracture toughness.

A team of Skoltech scientists led by Professor Artem Oganov used their USPEX evolutionary algorithm to predict a new material, WB5, that can be synthesized at normal pressure and can successfully compete with pobedit in the two most essential parameters ? hardness and fracture toughness ? which are 50% higher and 20% lower, respectively, for WB5 as compared to pobedit.

The new material is a previously unknown compound that can be easily obtained under normal conditions. The Skoltech scientists performed their study within the framework of Gazprom Neft's large-scale project aimed at creating new materials for drilling applications.

"Before we discovered the new material, we had studied a lot of systems on the computer, trying to predict stable chemical compounds and calculate their properties. These were quite interesting substances, although they could hardly compete with pobedit. At some point I thought we would never beat pobedit which has stood its ground for almost a century ? and for good reason. But suddenly we saw a glimmer of hope and soon found a unique compound, WB5," says the study lead Artem Oganov.

"The tungsten-boron system has been the subject of a multitude of experimental and theoretical studies, and it is surprising that this compound has not been discovered till now," says the first author Dr. Alexander Kvashnin.

Media Contact

Ilyana Zolotareva
shaibakova@phystech.edu
7-977-771-4699

 @phystech_en

https://mipt.ru/english/ 

Ilyana Zolotareva | EurekAlert!

Further reports about: Superhard substances USPEX algorithm chemical compounds

More articles from Materials Sciences:

nachricht From foam to bone: Plant cellulose can pave the way for healthy bone implants
19.03.2019 | University of British Columbia

nachricht Additive printing processes for flexible touchscreens: increased materials and cost efficiency
19.03.2019 | INM - Leibniz-Institut für Neue Materialien gGmbH

All articles from Materials Sciences >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: The taming of the light screw

DESY and MPSD scientists create high-order harmonics from solids with controlled polarization states, taking advantage of both crystal symmetry and attosecond electronic dynamics. The newly demonstrated technique might find intriguing applications in petahertz electronics and for spectroscopic studies of novel quantum materials.

The nonlinear process of high-order harmonic generation (HHG) in gases is one of the cornerstones of attosecond science (an attosecond is a billionth of a...

Im Focus: Magnetic micro-boats

Nano- and microtechnology are promising candidates not only for medical applications such as drug delivery but also for the creation of little robots or flexible integrated sensors. Scientists from the Max Planck Institute for Polymer Research (MPI-P) have created magnetic microparticles, with a newly developed method, that could pave the way for building micro-motors or guiding drugs in the human body to a target, like a tumor. The preparation of such structures as well as their remote-control can be regulated using magnetic fields and therefore can find application in an array of domains.

The magnetic properties of a material control how this material responds to the presence of a magnetic field. Iron oxide is the main component of rust but also...

Im Focus: Self-healing coating made of corn starch makes small scratches disappear through heat

Due to the special arrangement of its molecules, a new coating made of corn starch is able to repair small scratches by itself through heat: The cross-linking via ring-shaped molecules makes the material mobile, so that it compensates for the scratches and these disappear again.

Superficial micro-scratches on the car body or on other high-gloss surfaces are harmless, but annoying. Especially in the luxury segment such surfaces are...

Im Focus: Stellar cartography

The Potsdam Echelle Polarimetric and Spectroscopic Instrument (PEPSI) at the Large Binocular Telescope (LBT) in Arizona released its first image of the surface magnetic field of another star. In a paper in the European journal Astronomy & Astrophysics, the PEPSI team presents a Zeeman- Doppler-Image of the surface of the magnetically active star II Pegasi.

A special technique allows astronomers to resolve the surfaces of faraway stars. Those are otherwise only seen as point sources, even in the largest telescopes...

Im Focus: Heading towards a tsunami of light

Researchers at Chalmers University of Technology and the University of Gothenburg, Sweden, have proposed a way to create a completely new source of radiation. Ultra-intense light pulses consist of the motion of a single wave and can be described as a tsunami of light. The strong wave can be used to study interactions between matter and light in a unique way. Their research is now published in the scientific journal Physical Review Letters.

"This source of radiation lets us look at reality through a new angle - it is like twisting a mirror and discovering something completely different," says...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

VideoLinks
Industry & Economy
Event News

International Modelica Conference with 330 visitors from 21 countries at OTH Regensburg

11.03.2019 | Event News

Selection Completed: 580 Young Scientists from 88 Countries at the Lindau Nobel Laureate Meeting

01.03.2019 | Event News

LightMAT 2019 – 3rd International Conference on Light Materials – Science and Technology

28.02.2019 | Event News

 
Latest News

Laser processing is a matter for the head – LZH at the Hannover Messe 2019

25.03.2019 | Trade Fair News

A Varied Menu

25.03.2019 | Life Sciences

‘Time Machine’ heralds new era

25.03.2019 | Information Technology

VideoLinks
Science & Research
Overview of more VideoLinks >>>