Properties Advanced of the Silicon Nitride-Based Ceramics and Recent Performance on Automotive Parts Manufacture by Machining Process: Advanced Ceramics, Demand Forecast

摘要

Automotive parts manufacture by machining process using silicon-nitride-based ceramic tool development in Brazil already is a reality. Si{sub}3N{sub}4-based ceramic cutting tools offer a high productivity due to their excellent hot hardness, which allows high cutting speeds. Under such conditions the cutting tool must be resistant to a combination of mechanical, thermal and chemical attacks. Silicon-nitride-based ceramic materials constitute a mature technology with a very broad base of current and potential applications. The best opportunities for Si{sub}3N{sub}4-based ceramics include ballistic armor, composite automotive brakes, diesel particulate filters, joint replacement products and others. The goal of this work was to show latter advance in silicon nitride manufacture and its recent evolution on machining process of gray cast iron, compacted graphite iron and Ti-6Al-4V. Materials characterization and machining tests were analyzed by X-Ray Diffraction, Scanning Electron Microscopy, Vickers hardness and toughness fracture and technical norm. In recent works the authors has been proved to advance in microstructural, mechanical and physic properties control. These facts prove that silicon-nitride-based ceramic has enough resistance to withstand the impacts inherent to the machining of gray cast iron (CI), compacted graphite iron (CGI) and Ti-6Al-4V.