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Preparation technology for monocrystal turbine guide vane

A turbine guide vane and preparation technology, which is applied in the field of superalloys, can solve the problems of difficult blade growth, serious composition segregation, and increased cost of single crystal blades, so as to avoid miscellaneous crystals and surface porosity, simple process method, and improve production efficiency Effect

Active Publication Date: 2016-01-27
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The complex composition of single crystal superalloy materials makes the solidification temperature range wider and the composition segregation is more serious, which also makes the growth of single crystal turbine guide blades more difficult, especially at the edge of the blade, it is easy to form defects such as miscellaneous crystals and surface porosity. In turn, the overall integrity of the single crystal blades is destroyed, the yield of single crystal turbine blades is also significantly reduced, and the cost of single crystal blades is greatly increased, which seriously limits the large-scale use of single crystal superalloy turbine blades

Method used

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  • Preparation technology for monocrystal turbine guide vane
  • Preparation technology for monocrystal turbine guide vane
  • Preparation technology for monocrystal turbine guide vane

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Effect test

Embodiment 1

[0028] Firstly, the turbine blade wax mold, seed wafer wax mold 3 and single crystal crystal selector transition section wax mold 2 were prepared by injection molding, the injection temperature was 65°C, the pressure was 0.5MPa, the injection time was 10 seconds, and the pressure holding time was In 10 seconds, the thickness of seeding wafer wax mold 3 is 0.3 millimeters, the height of feeding segment 4 is 10 millimeters, and the length and width of its cross section are 5 millimeters; Then these three parts are pressed figure 1 Combine as shown, and then combine with the spiral crystal selector; the coating is powder (320 mesh) and silica sol solution, the powder is corundum powder, and the powder-to-liquid ratio is 3.5:1; the sanding material is corundum sand, the first layer of sanding 80-mesh sand, the second layer is 60-mesh sand, the third layer is 32-mesh sand, the fourth-seventh layer is 24-mesh sand, and the final sealing layer is made of surface coating; the wax mold ...

Embodiment 2

[0030] Firstly, the turbine blade wax mold, seed wafer wax mold 3 and single crystal crystal selector transition section wax mold 2 were prepared by injection molding. The injection temperature was 63°C, the pressure was 0.3MPa, the injection time was 30 seconds, and the pressure holding time was In 30 seconds, the thickness of seeding wafer wax mold 3 is 0.5 millimeters, the height of feeding segment 4 is 30 millimeters, and the length and width of its cross section are 20 millimeters; Then these three parts are pressed figure 1 Combine as shown, and then combine with the spiral crystal selector; the coating is powder (320 mesh) and silica sol solution, the powder is Shangdian powder, and the powder-to-liquid ratio is 3.2:1; the sanding material is Shangdian sand, and the sanding second The first layer is 80-mesh sand, the second layer is 60-mesh sand, the third layer is 32-mesh sand, the fourth-seventh layer is 24-mesh sand, and the final sealant layer is made of surface coat...

Embodiment 3

[0032] Firstly, the turbine blade wax mold, seed wafer wax mold 3 and single crystal crystal selector transition section wax mold 2 were prepared by injection molding, the injection temperature was 65°C, the pressure was 0.5MPa, the injection time was 10 seconds, and the holding time was 10 seconds; the thickness of seeding wafer wax mold 3 is 0.8 millimeter, the height of feeding section 4 is 20 millimeters, and the length and width of its cross section are 10 millimeters; Then these three parts are pressed figure 1Combine as shown, and then combine with the spiral crystal selector; the coating is made of powder (320 mesh) and silica sol solution, the powder is made of zircon powder, and the powder-to-liquid ratio is 3.5:1; the sanding material is zircon sand, and the sanding second The first layer is 80-mesh sand, the second layer is 60-mesh sand, the third layer is 32-mesh sand, the fourth-seventh layer is 24-mesh sand, and the final sealant layer is made of surface coating;...

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Abstract

The invention aims at providing a preparation technology for a monocrystal turbine guide vane. The preparation technology is characterized by employing a longitudinal monocrystal growing technology for preparing the monocrystal turbine guide vane. The preparation steps comprise firstly preparing a wax mold, combining the wax mold and a spiral crystal selector, making a shell by using a coating, removing wax, performing directional solidification, shelling and cleaning, removing the core, and removing a seeding thin sheet and a pouring system, so as to finally obtain a complete monocrystal turbine guide vane. The wax mold is composed of a turbine vane wax mold, a seeding-thin-sheet wax mold and a monocrystal-selector transition-segment wax mold; the turbine vane wax mold comprises a vane body, an upper margin plate, a lower margin plate and a feeding segment, the feeding segment is at the upper end faces of the margin plates, the monocrystal-selector transition-segment wax mold is connected with the lower end faces of the upper margin plate and the lower margin plate, and the seeding-thin-sheet wax mold is arranged in the space formed by the vane body, the upper margin plate, the lower margin plate and the monocrystal-selector transition-segment wax mold. The method is simple, low in cost and high in efficiency, and is suitable for large-scale production.

Description

technical field [0001] The invention belongs to the technical field of high-temperature alloys, and in particular provides a preparation process of a single-crystal turbine guide vane. Background technique [0002] The development of technical fields such as high thrust-to-weight ratio aero-engines requires materials with higher temperature bearing capacity. Nickel-based superalloys have excellent high-temperature properties. Therefore, nickel-based superalloys are mainly used as blade materials for advanced aero-engines and gas turbines. [0003] Nickel-based superalloys, also known as superalloys, are extremely complex in composition and usually contain more than ten elements, such as Ni, Al, Ti, Ta, W, Mo, Cr, Co, C, B, etc. Added Re, Ru, etc., for example, the second-generation nickel-based single-crystal superalloy contains 3wt% Re, and the third-generation nickel-based single-crystal superalloy contains 6wt% Re. Since the 1980s, a series of single crystal superalloy...

Claims

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Application Information

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IPC IPC(8): B22C9/04B22C9/28C30B11/00C30B29/52
Inventor 姜卫国肖久寒楼琅洪张功王莉郑伟
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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