Tribological properties of high-melting oxides and nonmetallic compounds at elevated temperatures. Part 1: Oxides

Information on the tribological properties of high-melting oxides and nonmetallic oxygen-free compounds at elevated temperatures in vacuum and in air is reviewed. This information will allow the identification of promising wear-resistant materials for use in high-temperature friction units; such materials could include ceramics based on high-melting oxides (aluminium, zirconium, chromium); ceramics based on nonmetallic high-melting compounds (silicon carbide and nitride and, to a lesser extent, boron carbide and cubic nitride); and composite materials based on oxides and nonmetallic compounds, including those containing high-melting metal-like compounds. To reduce the contact friction of these materials between themselves and with other materials, solid lubricating substances are necessary as components of composite materials or their coatings. It is advisable to use ceramic materials, applied using modern techniques, as coatings on friction units.