Numerical research of metal tungsten fluoride process

Roman Brendakov,Vladimir Brendakov,Alexander Shvab,G.V Kuznetsov,D Feoktistov,E Bulba

doi:10.1051/matecconf/201819401011

Roman Brendakov, Vladimir Brendakov + Show 4 more

Open Access

https://doi.org/10.1051/matecconf/201819401011

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Abstract

In this paper we consider the mathematical modelling of the process of obtaining tungsten hexafluoride gas, based on the reaction between tungsten powder and fluorine in a chemical reactor, which has a rectangle cross section channel as a working area. The modelling is conducted on the basis of solving three-dimensional equations of impulse, heat and substance transfer in the binary compound, taking into account the heterogeneous reaction undergoing on the bottom of the channel, between the tungsten powder layer and the fluorine gas flow. As a result of numerical solving the problem, the speed, concentration and temperature vector fields’ distributions were revealed, as well as integral characteristic of the completeness of fluorine use. The credibility of the results obtained is confirmed by test researches and the comparing of calculation results with the empirical evidence.

Highlights

The obtaining of wear-resistant coatings, products made of refractory complex form materials or other complex parts of machines, working at high temperatures, pressures and shearing stresses is a pressing issue nowadays
2 Mathematical model of the process. This process of tungsten powder fluoridation is made due to undergoing of the gaseous fluorine above the layer of tungsten powder, which is at the bottom of the channel
The credibility of the numerical solving of the liquid dynamics for the set course in the square section channel was defined by the matching with the analytical solution, which is presented in the Fig. 1

Summary

Introduction

The obtaining of wear-resistant coatings, products made of refractory complex form materials or other complex parts of machines, working at high temperatures, pressures and shearing stresses is a pressing issue nowadays. The most promising way of getting wear-resistant coatings or products made of refractory materials has recently been a method, based on their precipitation from steam-gas phase with the help of the recovery of their fluorides or chlorides [1]. To carry out this method, it is necessary to initially undertake the process of fluoridation of metal tungsten.

Mathematical model of the process

Numerical results

Conclusion