A cobalt-based alloy powder for laser repair of internal combustion engine supercharger rotor blades

Abstract

A cobalt-based alloy powder used for laser repair of internal combustion engine supercharger moving blades, its composition includes Co, Ni, Cr, Si; its feature is that it also includes Nb, Y, W, B, and each component (mass Percentage) is: Cr: 8~15%; Ni: 5~10%; Si: 0.1~0.5%; Nb: 0.3~0.5%; Y: 0.1~0.3%; W: 0.8~1.2%; B; 0.5~ 1%; Co: balance. The invention realizes that the alloy has moderate hardness and strength, has good toughness and high temperature oxidation resistance, forms a dense metallurgical bonding layer with the blade base material, and has a very small crack tendency, which meets the dynamic requirements of laser cladding turbochargers. blade requirements.

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