Cobalt base alloy powder for laser repair of moving turbocharger blade of internal combustion engine

Abstract

The invention discloses cobalt base alloy powder for laser repair of a moving turbocharger blade of an internal combustion engine. The cobalt base alloy powder comprises Co, Ni, Cr and Si and is characterized by also comprising Nb, Y, W and B, wherein all the components are shown as follows (in percentage by mass): 8-15% of Cr, 5-10% of Ni, 0.1-0.5% of Si, 0.3-0.5% of Nb, 0.1-0.3% of Y, 0.8-1.2% of W, 0.5-1% of B and the balance of Co. The cobalt base alloy powder is moderate in hardness and strength, favorable in toughness and high-temperature oxidation resistance, extremely low in crack tendency and capable of forming a compact metallurgical bonding layer together with a blade matrix and meeting the requirement for laser cladding of the moving turbocharger blade.

Description

technical field [0001] The invention relates to an alloy powder material suitable for laser cladding, in particular to a cobalt-based alloy powder with crack resistance and high temperature oxidation resistance for laser repair of internal combustion engine supercharger moving blades, which belongs to the international patent classification C23C24 / 10(2006.01) I technical field in the table. Background technique [0002] The supercharger is an important equipment for diesel locomotives to increase power and reduce energy consumption. In the supercharger, the moving blade is the core component. Since it works at a high temperature of 650-700°C, the working speed is as high as 10000-20000rpm. At such high temperatures and rotational speeds, the blades often wear out. Solid particles in the working medium of the supercharger can also cause damage to the blades. Once the blade is damaged, the dynamic balance of the rotor will be damaged and cause mechanical vibration, which wi...

AI Technical Summary

Problems solved by technology

[0006] Since the moving blade is made of superalloy, the weldability of the material is very poor. The conventional repair method is welding. The material used is generally cast iron welding rod, but these materials have problems during repair and use, such as cracking. , whitening, porosity, desoldering, etc.

The laser cladding repair method can solve some of the above welding problems very well, but laser cladding also requires corresponding powder materials. At present, there is no corresponding material for laser cladding of heat-resistant cast iron.

In the past, some materials with good cladding effect on other ferrous metals would have defects such as cracks and pores when cladding this kind of cast iron. Therefore, in order to repair the moving blades of the internal combustion engine supercharger, we specially invented it through theoretical analysis and experimental tests. A special powder for laser repair of internal combustion engine supercharger rotor blades