2015-Sustainable Industrial Processing Summit
SIPS 2015 Volume 7: Ionic Liquids & Energy Production
| Editors: | Kongoli F, Gaune-Escard M, Mauntz M, Rubinstein J, Dodds H.L. |
| Publisher: | Flogen Star OUTREACH |
| Publication Year: | 2015 |
| Pages: | 310 pages |
| ISBN: | 978-1-987820-30-0 |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
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Deposition of the Refractory Metal Carbides Coatings on Carbon Steels and Fibers: Their Properties and Applications
Vladimir Dolmatov1; Yuri Stulov2; Sergey Kuznetsov2;1INSTITUTE OF CHEMISTRY, KOLA SCIENCE CENTER RAS, Apatity, Russian Federation; 2INSTITUTE OF CHEMISTRY, KOLA SCIENCE CENTRE RAS, Apatity, Russian Federation;
Type of Paper: Regular
Id Paper: 47
Topic: 13
Abstract:
The aim of this work was deposition of thin films of the refractory metal carbides such as NbC, TaC, Cr7C3 on carbon steels and carbon fibers with further study their properties.
For deposition coatings of the refractory metal carbides, a currentless transfer in molten salts at temperatures 1073-1123 K was used with the time of the process from 6 up to 24 hours.
The corrosion rates of the refractory metal carbides in concentrated acids HCl, HNO3, H2SO4 and H3PO4 were evaluated by the loss of the sample weight. Coatings significantly reduce the corrosion rate of the steel substrates in concentrated acids.
The wear resistance tests of refractory metals carbides coatings on steel were carried out by using apparatus SMTS-2 at the limit load of 5 MPa in the medium of transformer oil at a slip rate of 1.2 m/s. The counter body was a sample of hardened St. 45. The tests were performed at a route section of 2000 m. The wear resistance was evaluated by the sample mass loss with the accuracy of 0.1 mg. The mass loss of a sample from hardened St.45 was 35.2 mg cm-2 and that of a coated with a chromium carbide-4.7 mg cm-2, niobium carbide-2.9 mg cm-2 and tantalum carbide-2.2 mg cm-2.
Deposition of NbC coatings on parts of oil pumps increased their lifetime in several times. Coatings of Cr7C3 or TaC on the knifes for cutting rubber, made of St. 3, improve their wear resistance and increase a tool life in 2.1 times.
Coatings of NbC or TaC on carbon fibers make better a fibers mechanical resistance and they are compatible with fibers up to 1473 K in an aggressive atmosphere.
Keywords:
coatings, refractory metal carbides, currentless transfer, corrosion and wear resistanceReferences:
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