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Carbon Nitride Synthesis by Shock Waves

#1732


Experimental Study of Possibility for Carbon Nitride Synthesis under Shock – Wave Loading

Tech Area / Field

  • MAT-SYN/Materials Synthesis and Processing/Materials
  • PHY-NGD/Fluid Mechanics and Gas Dynamics/Physics

Status
3 Approved without Funding

Registration date
19.12.1999

Leading Institute
VNIITF, Russia, Chelyabinsk reg., Snezhinsk

Collaborators

  • Technische Universität Darmstadt, Germany, Darmstadt

Project summary

Many artificially synthesized nitrides have a number of unique properties: high temperature of melting, low thermal conductivity, chemical inertness, and also great hardness.

The analysis of change in the properties of nitrides of a carbon subgroup shows the brightly expressed tendency to increase the melting temperature, heat formation, chemical stability as well as hardness according to the number decrease of the nitride-forming element in the row Sn3N4, Ge3N4, Si3N4, (C3N4). This row is ended in carbon nitride C3N4. It is known, (see “Nature”, v. 389, 1997, p. 675-677, p. 701-704) that some modifications of silicon nitride Si3N4, the nearest gomolog of carbon nitride, have hardness being close to that of diamond.

There is hope that the structures of carbon nitride C3N4 being similar to these modifications of silicon nitride Si3N4 will have greater hardness than diamond. However, any information concerned the existence of carbon nitride is absent in science literature.

According to indirect indications high pressures and temperatures which are not achieved in total under static conditions are necessary for the synthesis of carbon nitride C3N4. These pressures and temperatures are realized under special conditions of shock-wave loading. Proceeding from this the Project is proposed whose main purpose is to study the possibility to synthesize carbon nitride – material with the predictable superhardness of some its modifications – in shock and isentropic waves.

In VNIITF the unique technology of the shock-wave loading of samples by spherical shock waves with the recover of the samples and their subsequent thorough inspection (there are patent 2063449 and the positive decision on the issue of the patent 96148028, etc.) has been created. The variation of the initial amplitude of the shock wave, the composition and the initial state of the mixture being investigated makes possible to control the relation among pressure, temperature and duration of their influence on the material in the process of loading and unloading.


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