S P R A Y E R S F O R A P P L Y I N G C O N D U C T I V E C O A T I N G S

V. P . M a l a s h e n k o a n d I . P . G o n e h a r o v UDC 666.1.056

For a r t i c l e s with heating e lements used for fitting g lass to viewing cabins of machines and appara tus of complex shape the re a r e r ig id speci f ica t ions r ega rd ing uni formi ty of the i r heating and t r a n s p e r e n c y of the conductive coating.

The quality of t r a n s p a r e n t heating e lements depends not onIy on the degree of d i spe r s ion of the f i lm- forming solution that is applied to the g lass and conditions of working of the s p r a y e r but a l so on the m a t e - r i a l of which the s p r a y e r is made.

The s p r a y e r s made of rod copper , t i tanium al loys , and other m a t e r i a l s that a r e used for spray ing f i lm- fo rming solutions do not fully mee t the speci f ica t ions . This is due to the fact that the f i lm- fo rming solution for applying the coating contains f luorine compounds, ac ids , and other chemical r e ac t i ve s , which, a f t e r oxidizing and cor roding the m a t e r i a l of cons t ruc t ion of the s p r a y e r s , contaminate the conductive coating with oxidation produc ts .

The authors of the pape r have sugges ted and introduced to the indust ry a s p r a y e r which is devoid of the above defec ts . The s p r a y e r (Fig. 1) cons is t s of a case 1, a nozzle 2 made of f luoroplas t ic , a nipple 3 made of alloy OT4, a b r a s s nut 4 and a r ubb e r packing 5. A flexible tubing is a t tached to the tai l of nozzle 2. The f i lm- fo rming solution is fed through the tubing for applying the coating. Another f lexible piping is fixed to nipple 3 for c o m p r e s s e d a i r under a p r e s s u r e of about, 0.8 MPa. Due to the condition of e lect ion c rea ted at the head of the cas ing the f i lm- fo rming solution is sucked and applied through the o r i - fice of nozzle 2 on heated g lass in the f o r m of a e r o s o l s . The control of the p r o c e s s of applying the conduc- t ive coating on g lass is au tomat ic in accordance with a given p r o g r a m m e .

The appl ica t ion of the s p r a y e r of the above des ign ensu re s a be t t e r quality of fi lm, which is not con- t amina ted by the oxidation products of the m a t e r i a l of cons t ruc t ion of the s p r a y e r because of the fact that the s p r a y e r components (case and nozzle) having contact with the a g g r e s s i v e solut ion for applying the con- ductive coating a r e made of f luoroplas t ic , which is not wetted by the solution and is not oxidized by i ts act ion.

A f 2

3 -

Fig. 1

A-A

D Trans l a t ed f r o m Steklo i Keramika , No. 1, p. 35, January , 1976.

�9 Plenum Publishing Corporation, 22 7 West 17th Street, New York, N. Y. 10011. No part o f this publication may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means, electronic, mechanical, photocopying, microfilming, recording or otherwise, without written permission o f the publisher. A copy of this article is available from the publisher for $15.00.

58