Method for preparing reinforced nickel-based superalloy composite material single crystal blade

A technology of nickel-based superalloy and single crystal blade, which is applied in the field of aerospace materials, can solve the problems of low mechanical properties, short fatigue life at high temperature, etc., and achieve the effects of improving thermal conductivity, strong sintering driving force, and easy diffusion

Active Publication Date: 2020-03-17
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the shortcomings of the nickel-based superalloy single crystal blades produced in the prior art without adding graphene reinforcement materials, low mechanical properties, and short high-temperature fatigue life. An electromagnetic field based on ultra-fine single crystal nickel powder is proposed. The method of inducing the preparation of reinforced single crystal blades of nickel-based superalloy composite materials, by making full use of the excellent mechanical properties and high thermal conductivity of graphene reinforced materials, inhibits the generation and development of internal stress cracks during the operation of single crystal blades, and improves the performance of single crystal blades. Thermal conductivity, in order to quickly dissipate the heat of the blade itself during high temperature use, thereby improving the mechanical properties of the turbine blade at high temperature, especially improving the high temperature fatigue life and working temperature of the turbine blade

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] 2 micron spherical ultra-fine single crystal nickel powder is used, and 0.3wt% graphene powder is added. The added graphene is a single layer with a carbon content greater than 99% and a specific surface area greater than 80m 2 / g, the conductivity is greater than 1000S / m, and according to the material formula, add spherical ultrafine metal powders less than 5 microns in proportion, such as tungsten, molybdenum, chromium, cobalt, rhenium, ruthenium, aluminum, tantalum, etc., and mix them by ball milling in ethanol solvent Uniform, use the 3D printing process to form the blank of the blade, and then carry out regional melting and alloying on the blank, and at the same time form a large temperature gradient in the melting area for directional solidification, and apply an external electromagnetic field before and after the melting area to force the disordered tiny Orientation of magnetic domains of nickel powder single crystals, confinement induces directional growth of nic...

Embodiment 2

[0039] Apply 2 micron spherical ultrafine polycrystalline nickel powder, add 0.3wt% carbon nanotube powder, the added carbon nanotube is a single-walled carbon nanotube, the diameter is less than 4 μm, the length is less than 30 μm, and the purity is greater than 95%. Surface area greater than 400m 2 / g, the conductivity is greater than 150S / m, and according to the material formula, add spherical ultrafine metal powders such as tungsten, molybdenum, chromium, cobalt, rhenium, ruthenium, aluminum, tantalum, etc. in proportion, and mix them by ball milling in ethanol solvent Uniform, use the powder molding process to form the blank of the blade, and then carry out regional melting and alloying on the blank, and at the same time form a large temperature gradient in the melting area for directional solidification, and apply an external electromagnetic field before and after the melting area to force the disordered The orientation of the magnetic domains of the micro-nickel powder ...

Embodiment 3

[0041] Apply 2 micron spherical ultrafine polycrystalline nickel powder, add 0.3wt% carbon fiber powder, the added carbon fiber is carbon fiber powder with high thermal conductivity, the diameter is less than 50 μm, the length is less than 500 μm, the carbon content is greater than 99%, and the specific surface area is greater than 0.4m 2 / g, the electrical conductivity is greater than 1000S / m, and the thermal conductivity is greater than 400W / mK. At the same time, according to the material formula, tungsten, molybdenum, chromium, cobalt, rhenium, ruthenium, aluminum, tantalum and other spherical ultrafine metal powders are added in proportion , mixed evenly by ball milling in an ethanol solvent, using the powder molding process to form blade blanks, and then carry out regional melting and alloying on the blanks, and at the same time form a large temperature gradient in the melting area for directional solidification, and apply it before and after close to the melting area The...

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Abstract

The invention relates to a method for preparing a reinforced nickel base high-temperature alloy composite material single crystal blade. Ultrafine single crystal nickel powder is used as main raw materials; a reinforcing material is added; other ultrafine refractory metal powder is added according to the formula requirements of high-temperature alloy materials; and an aircraft engine graphene reinforced nickel base high-temperature alloy composite material single crystal turbine blade is prepared through an electromagnetic field constraint induction zone smelting directional solidification recrystallization method after molding. Compared with the prior art, excellent mechanical performance and high heat conductivity of the reinforcing material are fully used for inhibiting generation and development of internal stress cracks during working of the single crystal blade, so that the heat conducting coefficients and the quick heat dissipating performance of the single crystal blade are improved, the high-temperature mechanical performance, the working temperature and the high-temperature fatigue service life of a traditional single crystal blade are prominently improved, and the thrust-weight ratio of an aircraft engine is prominently increased.

Description

technical field [0001] The invention belongs to the technical field of aerospace materials, and in particular relates to a method for preparing single-crystal blades of reinforced nickel-based superalloy composite materials based on electromagnetic field induction of ultrafine nickel powder. Background technique [0002] Monocrystalline blades are cast blades with only one grain. The directionally solidified crystal blades eliminate the transverse grain boundaries that are sensitive to voids and cracks, and make all grain boundaries parallel to the stress axis, thereby improving the high-temperature performance of the alloy. At present, the turbine blades of aero-engines generally adopt the single-crystal hollow structure of composite air-film cooling, but due to its complex structure, low forming precision, and high scrap rate, the industrialization of single-crystal blade casting has not been realized, let alone passed. The addition of a second phase reinforcement enhance...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D27/02B22D27/04C30B29/52C22C19/03C22C47/08C22C49/02C22C49/14C22C101/10
CPCB22D27/02B22D27/045C22C19/03C22C47/08C22C49/02C22C49/14C22C2200/00C30B29/52
Inventor 胡晓斌胡庭鹏
Owner SHANGHAI JIAO TONG UNIV
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