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NiAl-Cr(Mo) biphase eutectic crystal intermetallic compound modified by Nb

A technology of intermetallic compounds and eutectic metals, which is applied in the field of NiAl-Cr dual-phase eutectic intermetallic compounds, can solve the problems of little improvement in high-temperature strength and failure to meet the use requirements, and achieve the effect of improving high-temperature strength

Inactive Publication Date: 2008-03-26
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the high-temperature strength of NiAl-Cr(Mo) dual-phase eutectic intermetallic compounds has not been greatly improved, and it still cannot meet the requirements of the new generation of gas turbine engines at 1150 °C. An effective approach to the comprehensive properties of NiAl intermetallic compounds

Method used

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  • NiAl-Cr(Mo) biphase eutectic crystal intermetallic compound modified by Nb
  • NiAl-Cr(Mo) biphase eutectic crystal intermetallic compound modified by Nb
  • NiAl-Cr(Mo) biphase eutectic crystal intermetallic compound modified by Nb

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Example 1: Preparation of 33Ni-28Al-30Cr-4Mo-5Nb intermetallic compound

[0034] The ingredients are formulated according to the composition of 33Ni-28Al-30Cr-4Mo-5Nb (atomic percentage), and the purity of the raw materials is 99.999%.

[0035] Melting 33Ni-28Al-30Cr-4Mo-5Nb alloy ingots in a non-consumable vacuum electric arc furnace with a vacuum degree of 5×10 -3 Pa, smelting temperature 3000°C, smelting 4 times, the raw materials are smelted evenly.

[0036] The obtained intermetallic compound rod was kept at 1200° C. for 12 hours in a high-temperature heat treatment furnace, and then cooled to room temperature with the furnace.

[0037] A cylinder sample with a diameter of 6mm and a height of 9mm and a square cylinder with a diameter of 6mm×6mm×30mm were cut from the heat-treated 33Ni-28Al-30Cr-4Mo-5Nb ingot by the wire cutting method for mechanical property testing.

[0038] Accurate to 10 with Model 1111 -4 The mass M of the sample is measured by an electroni...

Embodiment 2

[0040] Example 2: Preparation of 33Ni-23Al-30Cr-4Mo-10Nb intermetallic compound

[0041] The ingredients are 33Ni-23Al-30Cr-4Mo-10Nb (atomic percentage), and the purity of the raw materials is 99.999%.

[0042] Melting 33Ni-23Al-30Cr-4Mo-10Nb alloy ingots in a non-consumable vacuum electric arc furnace with a vacuum degree of 4×10 -3 Pa, the melting temperature is 2700°C, smelting 6 times, and the raw materials are smelted evenly.

[0043] The obtained intermetallic compound rod was kept at 1200° C. for 12 hours in a high-temperature heat treatment furnace, and then cooled to room temperature with the furnace.

[0044] The mechanical property testing conditions of 33Ni-23Al-30Cr-4Mo-10Nb intermetallic compound are the same as in Example 1, and its density is 6.44g / cm 3 See Figure 2. In the figure, the yield strength at 25°C is 1600MPa, and the compressive plasticity is greater than 15%; the yield strength at 800°C is 1100MPa, and the compressive plasticity is greater than ...

Embodiment 3

[0045] Example 3: Preparation of 33Ni-30Al-30Cr-4Mo-3Nb intermetallic compound

[0046] The ingredients are 33Ni-30Al-30Cr-4Mo-3Nb (atomic percentage), and the purity of the raw materials is 99.999%.

[0047] Melting 33Ni-30Al-30Cr-4Mo-3Nb alloy ingots in a non-consumable vacuum electric arc furnace with a vacuum degree of 5×10 -3 Pa, smelting temperature 2500°C, smelting 4 times, the raw materials are smelted evenly.

[0048] The obtained intermetallic compound rod was kept at 1200° C. for 12 hours in a high-temperature heat treatment furnace, and then cooled to room temperature with the furnace.

[0049] The mechanical property test condition of 33Ni-30Al-30Cr-4Mo-3Nb intermetallic compound is identical with embodiment 1, and its density is 6.16g / cm 3 See Figure 3. In the figure, the yield strength at 25°C is 1700MPa, and the compression plasticity is greater than 17%; the yield strength at 800°C is 750MPa, and the compression plasticity is greater than 35%; the yield st...

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Abstract

The present invention discloses one kind of Nb modified two-phase eutectic intermetallic NiAl-Cr(Mo) compound comprising Ni in 33 at.%, Cr in 30 at.%, Mo in 4 at.%, Nb in 1-13 at.% and Al for the rest. By means of lowering Al content in the two-phase eutectic intermetallic NiAl-Cr(Mo) alloy, and adding Nb element to modify and form one strong Laves(Cr2Nb) phase with Cr, the Nb modified two-phase eutectic intermetallic NiAl-Cr(Mo) compound has effectively raised high temperature strength. The Nb modified two-phase eutectic intermetallic NiAl-Cr(Mo) compound has yield strength at 1150 deg.c of 150-400 MPa and density of 6.1-6.7 g / cu cm.

Description

technical field [0001] The invention relates to a Nb-modified NiAl-Cr(Mo) double-phase eutectic intermetallic compound. The NiAl-Cr(Mo) double-phase eutectic intermetallic compound modified by Nb contains NiAl phase, Cr( Mo) phase and Cr 2 Nb phase. Background technique [0002] At present, in the industrial fields of power, petrochemical, transportation, especially aviation and aerospace, the metal structural materials used above 600 °C are usually nickel-based, iron-based and cobalt-based superalloys. These materials have a higher density (generally at 8.0g / cm 3 above), the components and equipment made are heavy. In order to reduce structural weight, improve efficiency, and reduce energy consumption, new superalloys with low density and high specific strength must be developed to meet the needs of future development in related industrial fields. What is more urgent is that currently the superalloys represented by Ni base and Co base are close to the limit temperature ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C30/00C22C1/02
Inventor 宫声凯汤林志张志刚刘先斌徐惠彬
Owner BEIHANG UNIV
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