Band Materials with Coating Based on Composite Powder Systems

摘要

The paper discusses investigation results of band materials formed by a continuous electrocontact sintering of thin-film powder coatings (50 to 100 μm) to the band metal substrate (copper and its alloys, steel). The coating materials were high-filled (up to 30 mass%) copper-graphite powder systems. The composition and structure of powder systems were investigated in association with triboengineering and physico-mechanical characteristics of band composites and their behavior in friction contact. Structural changes are shown in the composite at varying filler concentration in the metal matrix. Investigation has been carried out in the effect of technological factors of electrocontact sintering (force of electrode pressing, velocity of material motion, strength of sintering current, etc.) on the structure and triboengineering characteristics of thin-film coatings from copper-graphite systems. The calculated optimum parameters of electrocontact sintering ensured most perfect characteristics of thin-film copper-graphite coatings with 1-4% porosity. Most essential parameters proved to be strength of sintering current and force of electrode pressing.