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Alloy for impeller of aircraft gas compressor

A compressor and aircraft technology, applied in the field of alloys, can solve problems such as fracture toughness, stress corrosion resistance that cannot meet high strength, high toughness, high corrosion resistance, unstable working status of compressors, and restrictions on the development of the aircraft industry. Achieve the effect of excellent surface quality and crystalline structure, good hardness, and prevent cracking

Inactive Publication Date: 2017-12-01
NANJING LVZHICHENG PATENT TECH DEV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At a certain speed, when the boost ratio of the compressor increases to a certain value, the compressor will enter an unstable working state, and surge is likely to occur, causing the entire system to generate low-frequency and large-amplitude airflow axial pulsations. There may even be a momentary backflow of airflow
Compressor surge can lead to blade breakage, structural damage, combustion chamber overheating and engine stalling
[0003] The existing alloy and raw material selection and production process make the material high in strength, but its fracture toughness and stress corrosion resistance cannot meet the market demand for high strength, high toughness, and high corrosion resistance materials. The main structural materials still rely on imports, which is extremely The earth restricts the development of my country's aircraft industry

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] An alloy used for an aircraft compressor impeller is made of the following raw materials in parts by weight: 86.0 parts of Al, 3.4 parts of Ni, 0.7 parts of Si, 1.0 part of Fe, 1.8 parts of Cu, 0.8 parts of Mn, and 0.4 parts of Mg.

[0030] A kind of described production technique for the alloy of aircraft compressor impeller, concrete steps are:

[0031] (1) Dry pot preparation: blast the vacuum furnace crucible, heat it to 700°C, and keep it for 4 hours; then, when the crucible is cooled to 200°C, spray the crucible with liquid spray; then preheat the crucible to 600°C , keep warm for 2h; wherein, the liquid spray material is silicon nitride solution;

[0032] (2) Vacuum melting treatment: place the 1060 Al plate on the bottom of the vacuum furnace crucible, then add Ni, Si, Fe, Cu, Mn, Mg into the vacuum furnace crucible; then vacuum the vacuum furnace crucible to 1Mpa , heated up to 1100°C for high-temperature refining; then maintained at 930°C for low-temperature ...

Embodiment 2

[0039] An alloy used for an aircraft compressor impeller is made of the following raw materials in parts by weight: 95.0 parts of Al, 2.0 parts of Ni, 1.2 parts of Si, 0.7 parts of Fe, 2.6 parts of Cu, 0.4 parts of Mn, and 0.8 parts of Mg.

[0040] A kind of described production technique for the alloy of aircraft compressor impeller, concrete steps are:

[0041] (1) Dry pot preparation: blast the vacuum furnace crucible and heat it to 800°C for 2 hours; then when the crucible is cooled to 300°C, spray the crucible with liquid spray material; then preheat the crucible to 500°C , keep warm for 3h; wherein, the liquid spray material is silicon nitride solution;

[0042] (2) Vacuum melting treatment: place the 1060 Al plate on the bottom of the vacuum furnace crucible, then add Ni, Si, Fe, Cu, Mn, Mg into the vacuum furnace crucible; then vacuum the vacuum furnace crucible to 1Mpa , heat up to 1250°C for high-temperature refining; then maintain the temperature at 890°C for low-t...

Embodiment 3

[0049] An alloy used for an aircraft compressor impeller is made of the following raw materials in parts by weight: 89.2 parts of Al, 3.1 parts of Ni, 0.9 parts of Si, 0.8 parts of Fe, 2.2 parts of Cu, 0.6 parts of Mn, and 0.6 parts of Mg.

[0050] A kind of described production technique for the alloy of aircraft compressor impeller, concrete steps are:

[0051] (1) Dry pot preparation: blast the vacuum furnace crucible and heat it to 750°C for 3 hours; then when the crucible is cooled to 250°C, spray the crucible with liquid spray material; then preheat the crucible to 530°C , heat preservation for 2.5h; wherein, the liquid spray material is a silicon nitride solution;

[0052] (2) Vacuum melting treatment: place the 1060 Al plate on the bottom of the vacuum furnace crucible, then add Ni, Si, Fe, Cu, Mn, Mg into the vacuum furnace crucible; then vacuum the vacuum furnace crucible to 1Mpa , heat up to 1170°C for high-temperature refining; then maintain the temperature at 910...

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PUM

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Abstract

The invention provides alloy for an impeller of an aircraft gas compressor. The alloy is prepared from the following raw materials in parts by weight: 86.0-95.0 parts of Al, 2.0-3.4 parts of Ni, 0.7-1.2 parts of Si, 0.7-1.0 part of Fe, 1.8-2.6 parts of Cu, 0.4-0.8 part of Mn and 0.4-0.8 part of Mg. The alloy has the following advantages: silicon nitride spraying material is adopted to spray a crucible before smelting to prevent the crucible from crack at a high temperature; vacuum fusion treatment is adopted to enable sufficient degassing of fused alloy, remove impurities and avoid pollution; an electron beam is adopted to smelt alloy so as to ensure high strength, high tenacity and high corrosion resistance of alloy; solution treatment, salt bath quenching and twice aging treatment are adopted to enable the alloy to have higher hardness, yield strength, tensile strength, impact toughness and fatigue strength in the complicated aircraft flight environment; hot isostatic pressure treatment is adopted to improve the overall mechanical property of alloy ingot; sampling analysis, an alloy meter and an ultrasonic harmless flaw detector are adopted to detect the alloy ingot so as to ensure quality of the alloy ingot.

Description

technical field [0001] The invention relates to the technical field of alloys, in particular to an alloy used for an aircraft compressor impeller. Background technique [0002] The compressor is a component in a gas turbine engine that uses high-speed rotating blades to do work on the air to increase the air pressure. Compressors are designed according to given intake conditions, speed, boost ratio and air flow, but their working conditions (temperature, pressure, speed and air flow of the working environment, etc.) actually change. The performance under various working conditions is called the compressor characteristic. At a certain speed, when the boost ratio of the compressor increases to a certain value, the compressor will enter an unstable working state, and surge is likely to occur, causing the entire system to generate low-frequency and large-amplitude airflow axial pulsations. There may even be a momentary backflow of airflow. Compressor surge can cause blade bre...

Claims

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Application Information

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IPC IPC(8): C22C21/00C22C21/16C22C21/14C22C1/02C22B9/22C22F1/04C22F1/057
CPCC22B9/228C22C1/026C22C21/00C22C21/14C22C21/16C22F1/04C22F1/057
Inventor 张桂芳
Owner NANJING LVZHICHENG PATENT TECH DEV CO LTD
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