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3:58 PM  August 6, 2018

Tomsk scientists learned how to grow diamond coatings

© предоставила пресс-служба Томского политехаTomsk scientists learned how to grow diamond coatings

TOMSK, Aug 6 – RIA Tomsk. Scientists of Tomsk Polytechnic University learned how to grow diamond coverings with a speed, advancing technologies existing in market by 10 times. The first specialized installation was already sold to Japan. What Tomsk residents could surprise Japanese with, what is nanodiamonds – in material of RIA Tomsk.

Order from industry

There are no big miracles in diamondlike coverings: they are put decades. But the industrial technology for this purpose in Russia doesn't exist therefore, for example, the hard-alloy tool is imported for 100%. And the whole industries – from coal to semiconductor – depend on import. And once the order from the industry came …

The manager of the TPU Research and Production "Laboratory for Pulse-Beam, Electric Discharge and Plasma Technologies" Doctor of Engineering Gennady Remnev remembers:

"One day colleagues from Research Institute of Semiconductor Devices complained in a conversation: scientists are engaged in many things in Tomsk, but nobody makes diamond coverings. It was relevant for them: diamond is not just firm – it has also high heat conductivity, five times more than copper has. So, it is possible to increase the specific power of semiconductor products".

That conversation of six-year prescription became a starting point for formation of a new direction of works in laboratory. Candidate of Technical Sciences Stepan Linnik directs it from the very beginning.

© предоставила пресс-служба Томского политеха
Gennady Remnev says that applying a diamond covering to a hard-alloy tool allows to increase its hardness. On the photo: installation for sedimentation of cvd diamond in plasma of the abnormal smoldering category.

Correct diamonds

The diamond subject has arisen not from scratch: historically specialization of laboratory is creation of pulse accelerators of charged particles of nanosecond duration.

"The majority of experimental works on a research and change of properties of coverings, modeling of influence of powerful streams of plasma are conducted in Russia, China, Belarus and Kazakhstan with use of our accelerators", – Gennady Remnev notes.

Having such resource, it would be strange not to use it therefore the materials science was allocated in the separate area of work of the laboratory. Having developed own method of activation of plasma on accelerators, scientists could increase the speed of sedimentation of a diamond membrane by 10 times.

If the typical speed of sedimentation is one micron an hour, then polytechnics turned out to bring it to ten microns an hour with use of plasmas of abnormally smoldering category.

"To form a diamond, but not, for example, graphite, it is necessary to force to work a plasma source in a special way. Sedimentation goes from a gas phase. The method of hot threads was taken as a basis: tungsten delays heat methane in mix with argon to create plasma with the necessary properties. Methane decays on hydrogen and carbon, and carbon is besieged on a heated substrate", – Remnev explains.

Hydrogen, in turn, has very important property in this process: it etches carbon, besides the one, which is in a type of a diamond crystal lattice. Thus, diamond membrane grows.

© РИА Томск. Елена Тайлашева
Layer of a diamond membrane – is only a few microns (1 micron = one thousandth of a millimeter). Artificially grown up diamond covering doesn't differ from natural diamond on physical properties: first of all it is durability, insulating properties, good heat conductivity.
"We sold one of installations on sedimentation of diamond coverings on the hard-alloy tool to Japan. And not just sold – we continue to work as partners. For example, it is known that diamond is a dielectric, that is doesn't carry electric current. And Japanese needed a covering which would carry current. And we achieved these results", – Remnev tells.
© предоставлено пресс-службой Томского политехнического университета
The laboratory scientists develop diamond detectors for control of provision of bunches of charged particles for CERN. Two bunches of charged particles disperse towards each other at the speeds close to velocity of light. And they have to get precisely each other. And a collider ring - is 27 km...

"We are able to raise membranes of big size with a high speed that reduces the specific cost of such coverings", – the scientist emphasizes.

Works in this direction are supported by the Russian Federal Property Fund – the collective received a grant on studying of bases of superwearproof composite coverings synthesis on the basis of diamond and cubic nitride of a pine forest. Creation of new generation of the hard-alloy cutting tool has to become a result.

Also TPU grant – "Plasma technologies of synthesis of functional nanocomposite coverings with the increased thermal stability and physicomechanical characteristics" is implemented. Basic researches are conducted at Research School of High-Energy Physics, applied – at School of Advanced Manufacturing Technologies.

New properties

Now the physicists investigate even more interesting structures – nanodimensional diamond membranes which have very small size of crystallite.

"What is a membrane? There can be several monocrystals in a diamond, and the border between them is almost not visible. The polycrystalline membrane includes a set of such crystallites, only small. And if we make them very small, tens of nanometers, then it is possible to put certain properties in material", – the scientist tells.

For example, the covering can become steadier against radiation. Or – very flexible, when saving characteristics of hardness.

© предоставлено пресс-службой Законодательной думы Томской областиТомского политеха
TPU invited leading experts in the areas to work in the field of materials science: professor Jindrich Musil (on a photo on the right) from the University of West Bohemia (Czech Republic) and professor Vladimir Uglov (at the left) from the Belarusian State University.

Наверх
Сайт РИА Томск /riatomsk.ru/ содержит информацию, подготовленную Региональным информационным агентством "Томск" (РИА Томск) с территорией распространения – Российская Федерация, зарубежные страны.
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