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An electron beam melting device and a method for preparing a niobium-based super high temperature alloy using the device

An electron beam smelting and ultra-high temperature alloy technology is applied in the field of electron beam smelting device and the preparation of niobium-based ultra-high temperature alloy by using the device, which can solve the problems of rapid oxidation and unusability, and achieve the improvement of tensile strength and oxidation resistance. Effect

Inactive Publication Date: 2017-04-12
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, niobium-based alloys will be violently oxidized in air above 600°C, so although the niobium-based alloys used at 1100-1500°C have high strength, they oxidize so rapidly that they cannot be used without protection. Use in oxygen containing environment

Method used

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  • An electron beam melting device and a method for preparing a niobium-based super high temperature alloy using the device

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Effect test

Embodiment 1

[0029] A method for preparing a niobium-based super high temperature alloy, comprising the following process steps:

[0030] The ratio of Nb-1Zr niobium-based super high temperature alloy in this embodiment is as follows: Zr: 1.0%; Nb: balance.

[0031] ①Material preparation: According to the alloy ratio, add the alloying element metal raw material Zr into the feeding funnel, put the metal raw material Nb in the water-cooled copper crucible 8 of the electron beam melting furnace, and keep the temperature of the water-cooled copper crucible 8 during the whole preparation process is 200°C.

[0032] ② Preheating: Close the door of the electron beam melting furnace, turn on the electron gun mechanical pump 7, electron gun diffusion pump 6, melting chamber mechanical pump 11, melting chamber Roots pump 10, melting chamber diffusion pump 9, so that the electron beam melting furnace melts The vacuum degree of chamber 1 is less than 5×10 -2 Pa, the vacuum degree of the electron gun ...

Embodiment 2

[0038] The proportion of PWC-11 niobium-based super high temperature alloy in this embodiment is as follows: W: 10%; Zr: 1.0%; C: 0.1; Nb: balance.

[0039] ①Material preparation: According to the alloy ratio, add the alloying element metal raw materials W and Zr into the feeding funnel, and place the rest of the elemental metal raw materials in the water-cooled copper crucible 8 of the electron beam melting furnace according to the ratio. During the whole preparation process, keep water-cooled The temperature of the copper crucible 8 was 200°C.

[0040] ② Preheating: Close the door of the electron beam melting furnace, turn on the electron gun mechanical pump 7, electron gun diffusion pump 6, melting chamber mechanical pump 11, melting chamber Roots pump 10, melting chamber diffusion pump 9, so that the electron beam melting furnace melts The vacuum degree of chamber 1 is less than 5×10 -2 Pa, the vacuum degree of the electron gun chamber is less than 5×10 -3 Pa; set the hi...

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Abstract

The invention relates to an electron beam melting apparatus and a method for preparing a niobium-based superhigh temperature alloy by using the electron beam melting apparatus, which belongs to the alloy preparation field. The invention relates to an electron beam melting apparatus, which comprises a melting chamber, a directional solidification ingot pulling apparatus is arranged in the melting chamber; a bottomless water cooling copper crucible is arranged in the melting chamber, the internal size at the bottom of the water cooling copper crucible is cooperated to the size of a pallet of the directional solidification ingot pulling apparatus positioned at the lower part of the water cooling copper crucible, so that the pallet and the bottomless water cooling copper crucible can form a complete crucible. According to the niobium-based superhigh temperature alloy, S and P content can be reduced to less than 0.1ppmw, and oxygen content can be reduced to less than 0.1ppmw, carbon content can be reduced to less than 10ppmw, yielding rate of an alloy element is greater than 95%, high temperature tensile strength is increased to 50-80%, room temperature fracture toughness is increased to 5-30%, and antioxidation performance is increased to 5-15%.

Description

technical field [0001] The invention relates to an electron beam smelting device and a method for preparing a niobium-based super high temperature alloy by using the device, belonging to the field of alloy preparation. Background technique [0002] Superalloys are important materials for manufacturing heat-resistant parts in industries such as aviation, aerospace, nuclear power systems, and civil gas turbines. The highest temperature that the currently used nickel-based superalloys can withstand is 1039°C. With the rapid development of industrial construction and science and technology, there is an urgent need for metal materials that can be used in the temperature range of 1093-1370 °C. Due to the high melting point of metal niobium (2468°C), good ductility and thermal conductivity, high strength and specific strength, it is the lightest refractory metal (density 8.6), so niobium-based alloys are best hoped as ultra-high temperature structural materials in the 21st century...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B4/06C22C27/02B22D11/14
Inventor 姜大川王登科谭毅石爽
Owner DALIAN UNIV OF TECH
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