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Method for preparing nickel-aluminum-chromium-molybdenum eutectic alloy with outstanding structure heat stability

A thermally stable, eutectic alloy technology, applied in the field of nickel-aluminum-based eutectic alloy and its preparation, can solve the problems of unstable performance, reduced high temperature strength, shortened service life of the alloy, etc., and achieve the effect of excellent thermal stability

Inactive Publication Date: 2017-03-08
XIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patented technology allows for precise control over how layers are formed when making an ingot made from this material. By allowing certain dimensions between different materials within each phase, it becomes stronger due to better heat dissipation properties compared with traditional methods like castings or powders.

Problems solved by technology

This patents discusses intermetal metal compositions with unique characteristics like strong mechanical properties, corrosion resistances, electrical insulation ability, and extreme temperatures. These technical effects include improved durable life span compared to existing metals while maintaining superior physical properties over time.

Method used

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  • Method for preparing nickel-aluminum-chromium-molybdenum eutectic alloy with outstanding structure heat stability
  • Method for preparing nickel-aluminum-chromium-molybdenum eutectic alloy with outstanding structure heat stability
  • Method for preparing nickel-aluminum-chromium-molybdenum eutectic alloy with outstanding structure heat stability

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] A nickel-aluminum-chromium-molybdenum eutectic alloy with excellent thermal stability is prepared by the following method:

[0040] Step 1, raw material ratio: select Ni block with a purity of 99.96wt%, high-purity Al rod with 99.99wt%, Cr sheet with 99.9wt%, and Mo wire with 99.95wt%, according to the atom of 33Ni-33Al-28Cr-6Mo Percentage ingredients are proportioned.

[0041] In step 2, the metal raw materials are pretreated, the Mo wire and the Ni blocks are polished, and the Al rods are pickled to remove the scale on the surface of the raw materials.

[0042] In step 3, mass compensation is performed on Al and Cr before smelting. Specifically, 2.9 wt% of Al and 0.45 wt% of Cr need to be compensated.

[0043] Step 4, put the metal raw material to be smelted into the smelting equipment, and pump the vacuum of the furnace chamber to 5.9×10 -3 Pa and filled with high-purity argon; then smelted and cast into a master alloy; the smelting equipment is a high-vacuum non-c...

Embodiment 2

[0048] A nickel-aluminum-chromium-molybdenum eutectic alloy with excellent thermal stability is prepared by the following method:

[0049] Step 1, raw material ratio: select Ni block with a purity of 99.96wt%, high-purity Al rod with 99.99wt%, Cr sheet with 99.9wt%, and Mo wire with 99.95wt%, according to the atom of 33Ni-33Al-32Cr-2Mo Percentage ingredients are proportioned.

[0050] In step 2, the metal raw materials are pretreated, the Mo wire and the Ni blocks are polished, and the Al rods are pickled to remove the scale on the surface of the raw materials.

[0051] Step 3, performing mass compensation on Al and Cr before smelting, specifically, 3.0 wt% of Al mass compensation and 0.5 wt% of Cr mass compensation are required.

[0052] Step 4, put the metal raw material to be smelted into the smelting equipment, and pump the vacuum of the furnace chamber to 5.8×10 -3 Pa and filled with high-purity argon; then smelted and cast into a master alloy; the smelting equipment is...

Embodiment 3

[0057] A nickel-aluminum-chromium-molybdenum eutectic alloy with excellent thermal stability is prepared by the following method:

[0058] Step 1, raw material ratio: select Ni block with a purity of 99.96wt%, high-purity Al rod with 99.99wt%, Cr sheet with 99.9wt%, and Mo wire with 99.95wt%, according to the atom of 33Ni-33Al-26Cr-8Mo Percentage ingredients are proportioned.

[0059] In step 2, the metal raw materials are pretreated, the Mo wire and the Ni blocks are polished, and the Al rods are pickled to remove the scale on the surface of the raw materials.

[0060] In step 3, mass compensation is performed on Al and Cr before smelting. Specifically, 3.1 wt% of Al mass compensation is required, and 0.55 wt% of Cr mass compensation is required.

[0061] Step 4, put the metal raw material to be smelted into the smelting equipment, and pump the vacuum of the furnace chamber to 5.7×10 -3 Pa and filled with high-purity argon; then smelted and cast into a master alloy; the sme...

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Abstract

The invention discloses a method for preparing an NiAl-Cr(Mo) (nickel-aluminum-chromium-molybdenum) eutectic alloy with outstanding structure heat stability. The method specifically comprises the following steps: step 1, preparing raw materials based on ratio; step 2, preprocessing raw metal; step 3, performing mass compensation on Al and Cr before smelting; step 4, smelting; and step 5, performing directional solidification (controlling drawing pulling rate V to be more than 0 micron per second and not greater than 3.5 microns per second). With the adoption of the method, the problem that poor structure heat stability of the NiAl-Cr(Mo) prepared in the prior art leads to unstable performance, obviously-reduced high-temperature strength and short service life of the alloy can be solved; the structure heat stability of the alloy prepared by the method can be obviously improved, so that the comprehensive performance of the alloy can be improved, and as a result, the alloy is applicable to a heat end part of an aircraft engine.

Description

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Claims

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Application Information

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Owner XIAN UNIV OF TECH
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