A method of preparing nb-si based super high temperature alloy by laser selective melting technology

A laser selective melting and ultra-high temperature alloy technology, applied in the direction of improving energy efficiency and process efficiency, can solve the difficulty in meeting the requirements of Nb-Si-based alloy investment casting molding, multi-machining and post-processing, and limit alloy properties and other problems, to achieve the effect of eliminating the design and manufacturing process of molds, avoiding machining and post-processing, and improving comprehensive performance

Inactive Publication Date: 2016-08-17
BEIHANG UNIV
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Problems solved by technology

However, the disadvantages of traditional directional solidification mainly include: the cooling rate is low during the solidification process, which leads to the coarsening and growth of the alloy structure, which limits the improvement of the alloy performance. Elements, so it is very easy to have interface reaction with the contacting crucible at high temperature, causing alloy pollution, increased oxygen content, increased casting inclusions, and decreased mechanical properties
For investment casting of Nb-Si based alloys, the shell temperature capacity will exceed 2000°C. However, the shell temperature capacity currently used for investment casting of high-temperature structural materials does not exceed 1700°C. The base alloy reacts, and it is difficult to meet the requirements of Nb-Si based alloy investment casting
[0004] Not only that, the preparation of NbSi alloys by the above methods requires crucibles or molds, and it is difficult to directly prepare alloy parts with specific dimensions and complex structures (variable cross-sections, inner cavities or cooling channels), often requiring more machining and post-processing , the process is cumbersome, the production efficiency is low and it is easy to cause waste of alloy materials

Method used

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  • A method of preparing nb-si based super high temperature alloy by laser selective melting technology
  • A method of preparing nb-si based super high temperature alloy by laser selective melting technology
  • A method of preparing nb-si based super high temperature alloy by laser selective melting technology

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Embodiment 1

[0027]Using SLM technology to prepare Nb-18Si-24Ti-2Cr-2Al-2Hf (at.%, atomic percentage) super high temperature alloy: the SLM laser selective melting system used mainly includes: Nd-YAG laser, computer system for forming control, Powder feeding system and argon atmosphere protection device;

[0028] 1. Select Nb-18Si-24Ti-2Cr-2Al-2Hf pre-alloyed powder prepared by argon atomization method, the powder is spherical or nearly spherical, and the diameter is between 10 and 60 μm;

[0029] 2. According to the shape of the alloy parts to be processed, use the computer to establish a three-dimensional CAD model, and use the slicing software to perform layered slice discretization in the height direction of the model. Section profile information and scanning processing path, save multi-layer slice information as STL file, and transfer to SLM laser melting system;

[0030] 3. Put the powder into the forming cavity, and fix the Ti6Al4V forming substrate with a thickness of 10mm on the ...

Embodiment 2

[0037] Using SLM technology to prepare Nb-16Si-22Ti-4Cr-2Al-2Hf (at.%, atomic percentage) super high temperature alloy: the SLM laser selective melting system used mainly includes: Nd-YAG laser, computer system for forming control, Powder feeding system and argon atmosphere protection device;

[0038] 1. Select Nb-16Si-22Ti-4Cr-2Al-2Hf pre-alloyed powder prepared by argon atomization method, the powder is spherical or nearly spherical, and the diameter is between 10 and 60 μm;

[0039] 2. According to the shape of the alloy parts to be processed, use the computer to establish a three-dimensional CAD model, and use the slicing software to perform layered slice discretization in the height direction of the model. Section profile information and scanning processing path, save multi-layer slice information as STL file, and transfer to SLM laser melting system;

[0040] 3. Put the powder into the forming cavity, and fix the Ti6Al4V forming substrate with a thickness of 10mm on the...

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Abstract

The invention belongs to the technical field of preparation of high-temperature alloy, and particularly relates to a method for preparing NbSi superhigh-temperature alloy by SLM (selective laser melting) technology. SLM equipment is utilized, the process parameters are reasonably set, and an NbSi alloy forming piece is directly prepared by a CAD (computer-aided design) model in a one-step way. The prepared NbSi alloy has the characteristics of high density, fewer defects, fine phase size and uniform distribution, and mainly consists of Nbss solid solution and Nb5Si3 strengthening phase. The NbSi alloy prepared by the method has the advantages that a die is not needed, the interface reaction is avoided, the alloy pollution is reduced, the content of impurities is reduced, the utilization rate of material is high, and the comprehensive yield and production efficiency of the NbSi alloy can be improved.

Description

technical field [0001] The invention belongs to the technical field of high-temperature alloy preparation, and in particular relates to a method for preparing NbSi super high-temperature alloy by using laser selective melting technology. Background technique [0002] With the development of high-performance aero-engines and gas turbines in the direction of high flow ratio, high thrust-to-weight ratio, and high inlet temperature, the operating temperature of hot-end components such as turbine blades continues to increase, and the turbine inlet temperature also continues to increase. At present, the maximum service temperature of the third-generation nickel-based single crystal superalloy used in jet engines has reached 1100-1150 °C, which is close to 85% of the melting point of the alloy, and there is little potential for further improvement. Therefore, it is urgent to develop new structures. Material. At present, refractory silicides have become a hot spot in the research f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F3/105C22C27/02
CPCY02P10/25
Inventor 张虎孙少波贾丽娜李震徐惠彬
Owner BEIHANG UNIV
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