Abstract
Obtained a high-density material (p = 3, 28 g/cm3, a porosity of 1, 4 %) on the basis of silicon nitride powder by liquid phase sintering nanoscale. Displaying pressing pressure on the density of sintered materials the based silicon nitride. The process of pattern formation material during sintering. The main physico-mechanical characteristics: the density, porosity and grain size of the solid phase, the modulus of elasticity, flexural strength, fracture toughness ratio, Vickers hardness.
Highlights
Oxygen-free ceramics belongs to the brittle materials do not exhibit macroscopic ductility and fracture when loaded up to the dissociation temperature of the compounds
High properties are achieved at the materials produced by the last two methods, a large energy consumption, inability to obtain articles of complex shapes and low productivity limit the reception of materials by this method on an industrial scale. reaction sintering method is impossible to obtain dense materials with a porosity of less than 5 vol %
Obtaining ceramics of high quality with a maximum level of mechanical properties is possible while achieving high density
Summary
Oxygen-free ceramics belongs to the brittle materials do not exhibit macroscopic ductility and fracture when loaded up to the dissociation temperature of the compounds. This phenomenon makes it possible to create a unique class of structural materials with high hardness, strength and stability of mechanical properties in a wide range of temperatures, exceeding significantly the properties of metal alloys [1]. Silicon nitride is widely used in industry due to its unique combination of physical and mechanical properties such as high hardness and mechanical strength, low thermal conductivity and good erosion properties that allows to apply the product of Si3N4 as a wear-resistant, heat-resistant and acid resistant materials, working in extreme conditions of high temperature and aggressive environments. Using the silicon nitride nanoscale powders (n-Si3N4) allows to obtain dense materials with maximum mechanical characteristics, but complicates the intermediate preparation materials
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