Formation of electrospark coatings on steel H12MF using shs electrodes Ti-Zr-C with Ni-based binder
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MANAKOVA, O., LEVASHOV, E., KUDRYASHOV, A.. Formation of electrospark coatings on steel H12MF using shs electrodes Ti-Zr-C with Ni-based binder. In: Materials Science and Condensed Matter Physics, Ed. 7, 16-19 septembrie 2014, Chișinău. Chișinău, Republica Moldova: Institutul de Fizică Aplicată, 2014, Editia 7, p. 288.
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Materials Science and Condensed Matter Physics
Editia 7, 2014
Conferința "Materials Science and Condensed Matter Physics"
7, Chișinău, Moldova, 16-19 septembrie 2014

Formation of electrospark coatings on steel H12MF using shs electrodes Ti-Zr-C with Ni-based binder


Pag. 288-288

Manakova O., Levashov E., Kudryashov A.
 
National University of Science and Technology MISiS, Moscow
 
Disponibil în IBN: 18 martie 2019


Rezumat

Development of new electrode materials and multifunctional coatings with a high level of physical and mechanical properties is a priority of materials science. Composite dispersion-hardened ceramic electrode materials based on (Ti, Zr)C carbide were developed and used for the deposition  of multifunctional coatings on the working surfaces of machine parts and mechanisms by electrospark deposition (ESD). To increase erosion of the electrodes, and to improve the quality of the formed coatings a metal binder based on Ni was introduced into the electrode material. In this work electrode materials based on Ti-Zr-C systems with binder were produced by combined force SHS-pressing technology. The electrode materials were heat treated in vacuum at a temperature of 900 °C for 4 hours.  The structure of Ti-Zr-C-binder alloys was based on titanium carbide (Ti,Zr)C and zirconium carbide (Zr,Ti)C grains, surrounded by a binder (Figure 1). Such a structure is characterized by high erosion in the arc discharge due to significant increase in the mass transfer rate from anode to cathode  after binder melting.  The features of the electric-spark coatings formation on the steel substrate at different processing modes were studied. The structure, composition and properties (thickness, continuity, microhardness, wear resistance) of the as-deposited electric-spark coatings were investigated. The tribological properties of the coatings (coefficient of friction) and roughness were studied. The coatings are characterized by a high continuity up to 100%, thickness of 10-18 µm and a microhardness up to 11.8 GPa. ESD increases the wear- and heat resistance of the samples on H12MF steel.  Technological process of punch head of stamp hardening was developed. Tests carried out in at JSC "Ural Scientific-Technological Complex" (Nizhny Tagil) showed that the coatings deposited using Ti-Zr-C-binder electrodes increased the lifetime of the working surface of the stamps more than 5 times.