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A high-temperature oxidation-resistant heat-resistant copper-nickel-based alloy

A high-temperature oxidation-resistant, nickel-based alloy technology, applied in the field of high-temperature oxidation-resistant heat-resistant copper-nickel-based alloys, can solve the problems of thermal conductivity, casting and hot forming process performance, poor machinability, and easy oxidation, etc., to achieve excellent high temperature resistance Oxidation properties, the effect of overcoming poor thermal conductivity, and good high-temperature thermal conductivity

Active Publication Date: 2017-04-12
HUNAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the thermal conductivity, casting and hot forming process performance and machinability of the above-mentioned alloys are poor; the copper-nickel alloy has medium or higher strength, good thermal conductivity, heat resistance, corrosion resistance and processing and forming performance, but it is in high temperature atmosphere. The surface of the alloy is prone to oxidation in the environment, forming CuO, Cu 2 O, NiO oxidation products

Method used

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  • A high-temperature oxidation-resistant heat-resistant copper-nickel-based alloy
  • A high-temperature oxidation-resistant heat-resistant copper-nickel-based alloy
  • A high-temperature oxidation-resistant heat-resistant copper-nickel-based alloy

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Embodiment 1

[0047] The raw materials are mixed according to mass percentage: Ni 28%, Al 8%, Cr 3%, Zr 2%, Si 1%, Ce 0.4%, and the balance is Cu, and are melted in a vacuum induction furnace. The melting temperature is 1320° C., and the temperature is kept for 10 minutes. Then, the alloy liquid with a pouring temperature of 1250° C. was poured into a steel mold with a diameter of 30 mm, and cooled naturally to obtain a circular ingot with a diameter of 30 mm. The microstructure of the alloy casting is composed of a large amount of α-Cu solid solution phase, a certain amount of β-Cr-rich phase and NiAl phase. The size is relatively large. The microhardness, tensile strength and elongation values ​​are shown in Table 2. The high temperature oxidation gain is shown in Table 3.

Embodiment 2

[0049] The raw materials are mixed according to mass percentage: Ni 29%, Al 8.5%, Cr 3.5%, Zr 2%, Si 1%, Ce 0.5%, and the balance is Cu, and are melted in a vacuum induction furnace. The melting temperature is 1325° C., and the temperature is kept for 10 minutes. Then, the alloy liquid with a pouring temperature of 1255° C. was poured into a steel mold with a diameter of 30 mm, and cooled naturally to obtain a circular ingot with a diameter of 30 mm. The microstructure of the alloy casting is composed of a large amount of α-Cu solid solution phase, a certain amount of β-Cr-rich phase and NiAl phase. The size is relatively large. See Table 2 for its microhardness, tensile strength and elongation; see Table 3 for its high-temperature oxidation gain.

Embodiment 3

[0051] The raw materials are mixed according to mass percentage: Ni 30%, Al 9%, Cr 4%, Zr 2.5%, Si 1.5%, Ce 0.6%, and the balance is Cu, and are melted in a vacuum induction furnace. The melting temperature is 1325°C and the temperature is kept for 12 minutes. Then, the alloy liquid with a pouring temperature of 1260° C. was poured into a steel mold with a diameter of 30 mm, and cooled naturally to obtain a circular ingot with a diameter of 30 mm. The microstructure of the alloy casting is composed of fine α-Cu solid solution phase, a small amount of β-Cr-rich phase and NiAl phase. See Table 2 for its microhardness, tensile strength and elongation; see Table 3 for its high-temperature oxidation gain.

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Abstract

A high temperature oxidation and heat resistant copper-nickel-based alloy is composed of 28-35mass% of Ni, 8-10mass% of Al, 3-5mass% of Cr, 1-2mass% of Si, 2-3.5mass% of Zr, 0.4-0.8mass% of Ce, and the balance of Cu, and is prepared through fusion casting and uniform annealing. The microstructure of the alloy is composed of an alpha-Cu solid solution phase, a NiAl phase and a beta Cr-rich phase. The alloy has good conduction performance, good corrosion resistance, good mechanical performances, excellent oxidation resistance and excellent heat fatigue resistance, can stably work at below 800DEG C for a long term, and is suitable for being used as an ideal material to make die casting dies of aluminum alloy, zinc alloy and other low melting point alloys, glass and plastic forming dies, and steam pipelines and other components working in cold and hot alternation environment.

Description

technical field [0001] The invention relates to a high-temperature oxidation-resistant heat-resistant copper-nickel-based alloy. Background technique [0002] In metallurgy, thermal energy, chemical industry, material processing and other industrial fields, there are many parts working in high temperature environment, especially in the conditions of cold and heat cycle changes. These parts often fail due to high temperature oxidation and thermal fatigue. The high-temperature performance of the material puts forward higher requirements; nickel-based alloy is a commonly used high-temperature alloy material, the heat-resistant temperature is as high as 950 ° C, and it has excellent high-temperature mechanical properties, oxidation resistance, corrosion resistance and high temperature alternating resistance. Stress characteristics, the material is mainly used for hot-end parts on aero-engines; the oxidation resistance, thermal fatigue performance, and high-temperature creep resi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C9/06C22C30/02C22F1/08C22F1/16
Inventor 彭成章曹获熊伟向浪左思
Owner HUNAN UNIV OF SCI & TECH
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