Material for preparing turbine rotor of pressurizer and method for preparing turbine rotor by material

Abstract

The invention belongs to the technical field of manufacturing of turbine rotor of a pressurizer, in particular to a material for preparing a turbine rotor of the pressurizer and a method for preparing the turbine rotor by the material. The material for preparing the turbine rotor of the pressurizer comprises the components in parts by weight as follows: 85-90 parts of silicon nitride powder, 1-8 parts of boron nitride nanotube powder, 2-4 parts of aluminite powder, 2-4 parts of silicon powder and 3-5 parts of zirconium oxide powder. The method for preparing the turbine rotor by the material comprises the steps of: (1) preparing a raw material; (2) preparing a paste material; (3) injection moulding; (4) setting and drying; and (5) gas pressure sintering of mould constraint. The turbine rotor of the pressurizer prepared by the material is light in weight, good in toughness, high in strength, low in specific gravity and good in proportionality, and small in lag proportionality, small in deformation, small in accumulated carbon and long in service life under supernormal work conditions such as high temperature, high pressure and high speed. Meanwhile, the method for preparing the turbine rotor by the material is simple in steps, convenient to operate and is beneficial for industrialized production in a large scale.

Description

Technical field [0001] The invention belongs to the technical field of manufacturing turbocharger turbine rotors, and specifically relates to a preparation of ceramic turbine rotors for superchargers [0002] Sub-materials and methods for preparing turbine rotors using the materials. Background technique [0003] The use of exhaust gas turbocharging has become one of the most important methods for improving power, economy and emission characteristics of gasoline engines and diesel engines in the world. The turbocharger uses the energy of high-temperature exhaust gas discharged from the engine to drive the exhaust gas turbine in the turbine chamber to rotate at a high speed, thereby driving a compressor coaxial with the turbine to achieve supercharging, thereby improving the performance of the engine. Traditional turbine rotor materials generally use nickel-based alloys. However, under high temperature, high pressure, and high-speed environmental conditions, nickel-based turbine ro...

AI Technical Summary

Problems solved by technology

However, the intrinsic brittleness of silicon nitride ceramics faces the problem of thermal shock damage under extremely harsh service conditions, as well as the problem of structural evolution damage and sharp attenuation of performance of the formed thermal shock damage under long-term high temperature and complex loads. The reliability of ceramic turbine rotors is severely challenged

[0005] The inherent brittleness and harsh service environment of silicon nitride ceramic turbine rotors lead to unstable performance, flying blades, and low service life

In the past, the raw material formula of silicon nitride ceramic turbine rotors was only a mixture of different ceramic components. Such ceramic turbine rotors were extremely unstable due to their brittleness.

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