Application of Gyrotron Radiation for Coating and Welding
- PDF / 150,572 Bytes
- 2 Pages / 420.48 x 639 pts Page_size
- 42 Downloads / 159 Views
APPLICATION OF GYROTRON RADIATION FOR COATING AND WELDING B. E. PATON, V. E. SKLYAREVICH E. 0. Paton Electric Welding Institute of the Ukr. SSR Academy of Sciences Kiev, USSR ABSTRACT The availability of high power high frequency microwave sources of up to tens of kW has opened up important technological and industrial applications of microwave radiation. The particular use of gyrotrons for generating the high power microwaves is considered. The application of high power microwaves for fusing wear resistant coatings onto refractory materials is discussed, together with the brazing of ceramics, welding together of thick metal parts and the rapid heating and curing of polymers for high reliability long life environmental coatings. It is shown that the use of high power gyrotron radiation enables considerable improvements to be made on conventional technologies for high temperature processing of materials and enables the development of new and efficient processes.
The creation of high-power microwave generators has recently provided further possibilities for the practical application of microwave radiation for technological purposes. In this connection a most promising device is the gyrotron 1 which can generate microwave radiation in the GHz frequency range with powers up to tens of kW and high generation efficiency (above 30%). The radiation generated in this way has the form of a beam, the configuration of which can be varied by means of metal mirrors, i.e., the power may be dispersed over a considerable area or focused to the radiation wavelength. One can easily change the beam direction, transport the energy over comparatively large distances without appreciable losses, introduce it into containers with atmospheres of any gas composition and pressure. Gyrotron radiation requires no resonators or other specialized equipment. Non-metallic materials are characterized by the deep penetration of microwave radiation. In the short waveband in particular, efficient selective heating occurs in a material exposed to the radiation. Metal surfaces reflect microwave radiation and its penetration into metal is negligible (skin effect). These properties of gyrotron radiation were used by the E. 0. Paton Electric Welding Institute of the Ukr. SSR Academy of Sciences to develop a number of technologies. The specific character of ceramic heating and melting by the gyrotron microwave radiation enables the application of high temperature wear-resistant coatings onto refractory items used in metallurgy. Due to the selective character of the heating, it is possible to apply fused pore-free coatings of high-refractory materials onto ceramic substrate. Items produced by this method are characterized by their higher performance, due to the increase in refractoriness, the large thickness of the coating with a comparatively wide transition zone, thus ensuring heat resistance of the coating. I Microwave electronic instruments: Handbook for higher schools/Berezin, V. M., Buryak, V. S.. Guttsait, E. M., Matin, V. P.-M.: Vysshaya Shkola, 1985
Data Loading...
