For Si3N4 and Sialon ceramic sintered bodies, there has been provided a process of molding with superplasticity without forming a composite material and maintaining a single state, and a sintered body molded according to the process is provided. A silicon nitride and a Sialon sintered body having a relative density of 95% or more and a linear density of 50 μm in a two-dimensional cross-section of a sintered body in a range of 120 to 250; at a temperature of 1,300 to 1,700°C by stretching or Compression causes plastic deformation at a strain rate of less than 10-1/sec for molding. The molded sintered body has excellent mechanical properties particularly at normal temperature.
Si3N4 ceramic is an important structural material. It is a kind of superhard substance. It has lubricity and wear resistance. It does not react with other inorganic acids except hydrofluoric acid. It has strong anti-corrosion ability and high temperature resistance. Oxidation. And it can also resist the thermal shock, heated in the air to more than 1,000 °C, rapid cooling and then sharp heating, it will not break. It is because of such excellent characteristics of Si3N4 ceramics, people often use it to make bearings Mechanical components such as gas turbine blades, mechanical seal rings, and permanent molds. If a silicon nitride ceramic that is resistant to high temperatures and does not easily transfer heat is used to produce the heated surface of the engine components, it can not only improve diesel engine quality, save fuel, but also improve thermal efficiency. China and the United States, Japan and other countries have developed this type of diesel engine.
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