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Tool for vacuum heat treatment of directional/single-crystal high-temperature alloy blades and preparation process of tool

A technology of vacuum heat treatment and superalloy, applied in heat treatment equipment, heat treatment furnace, metal processing equipment, etc., can solve problems such as short circuit of heating body, conduction between blade and furnace body, damage to blade surface, etc.

Inactive Publication Date: 2021-02-12
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

If metal molybdenum is used to make tooling to place blades, it is easy to cause a diffusion reaction between the blade and the tooling and damage the surface of the blade.
In addition, if the molybdenum tooling is used for a long time, it may cause conduction between the blade and the furnace body, and short-circuit the heating body.

Method used

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  • Tool for vacuum heat treatment of directional/single-crystal high-temperature alloy blades and preparation process of tool
  • Tool for vacuum heat treatment of directional/single-crystal high-temperature alloy blades and preparation process of tool
  • Tool for vacuum heat treatment of directional/single-crystal high-temperature alloy blades and preparation process of tool

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] According to the outer contour size of the blade tenon, design the shape of the wax mold of the base to be similar to the blade tenon and be 5mm larger than its outer contour; make the tooling wax mold, the size is: a=100mm, b=30mm, c=250mm, m=50mm, n= 20mm, k=15mm. The wax mold is prepared by injection molding. The injection pressure of the wax mold is 0.8MPa, the injection time is 30s, and the pressure holding time is 40s. After the wax mold is prepared, the mold shell is prepared by precision casting. The coating used in the shell making process is a mixture of alumina powder and silica sol, the particle size of the powder is 300-400 mesh, the mass ratio of powder to liquid is (3.0-3.5):1, the pH value is 8-11, and the sand material is Al 2 o 3 Granules, the sand material particle size is 24-80 mesh, the drying time is 24h, and the shell thickness is 7mm. After the formwork is prepared, the sealing treatment is carried out, and the sealing treatment material is a c...

Embodiment 2

[0029] Make the tooling wax mold, the size is: a=120mm, b=30mm, c=250mm, m=50mm, n=20mm, k=30mm, the wax mold is prepared by injection molding, the wax mold injection pressure is 0.8MPa, and the injection time is 40s , The pressure holding time is 50s. After the wax pattern is prepared, the mold shell is prepared by the precision casting process. The coating used in the shell making process is a mixture of alumina powder and silica sol, the particle size of the powder is 300-400 mesh, the mass ratio of powder to liquid is (3.0-3.5):1, the pH value is 8-11, and the sand material is Al 2 o 3 Granules, the sand material particle size is 24-80 mesh, the drying time is 24h, and the shell thickness is 6mm. After the formwork is prepared, the sealing treatment is carried out, and the sealing treatment material is a coating formed by uniformly mixing alumina powder and silica sol in a weight ratio of 1:2.8. After the formwork is completely dry, grind off one end of the pre-loaded bl...

Embodiment 3

[0031] Make the tooling wax mold, the size is: a=200mm, b=30mm, c=250mm, m=50mm, n=30mm, k=30mm, the wax mold is prepared by injection molding, the wax mold injection pressure is 0.8MPa, and the injection time is 50s , The pressure holding time is 60s. After the wax pattern is prepared, the mold shell is prepared by precision casting process. The coating used in the shell making process is a mixture of alumina powder and silica sol, the particle size of the powder is 300-400 mesh, the mass ratio of powder to liquid is (3.0-3.5):1, the pH value is 8-11, and the sand material is Al 2 o 3 Granules, the sand material particle size is 24-80 mesh, the drying time is 24h, and the shell thickness is 9mm. After the formwork is prepared, the sealing treatment is carried out, and the sealing treatment material is a coating formed by uniformly mixing alumina powder and silica sol in a weight ratio of 1:2.8. After the formwork is completely dry, grind off one end of the pre-loaded blade ...

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Abstract

The invention discloses a tool for vacuum heat treatment of directional / single-crystal high-temperature alloy blades and a preparation process of the tool, and belongs to the technical field of heat treatment of high-temperature alloy castings. The tool is a base on which a plurality of directional / single-crystal high-temperature alloy blade tenons can be placed. The preparation process comprisesthe following steps of (1) designing wax molds with corresponding sizes according to the geometric sizes of the outer contours of the blade tenons; (2) preparing a mold shell by adopting a precision casting process, wherein the mold shell is made of an aluminum oxide material; and (3) sintering and strengthening the mold shell, and thus obtaining the tool for vacuum heat treatment of the blades after sintering. The tool can meet the requirements for fixing and placing the blades, the blades are prevented from being bonded or recrystallized due to mutual overlapping and collision in the vacuumheat treatment process, and then the heat treatment quality of the high-temperature alloy blades is guaranteed.

Description

technical field [0001] The invention relates to the technical field of heat treatment of superalloy castings, in particular to a tooling for vacuum heat treatment of directional / single crystal superalloy blades and a preparation process thereof. Background technique [0002] Superalloy blades are the key hot-end parts of aero-engines and gas turbines. In recent years, with the continuous development of aviation, ships, and industrial power generation, superalloy blades such as single crystal and directional alloys have been widely used in the fields of aeroengines and gas turbines. Usually, single crystal and directional alloy blades require high temperature and long-term vacuum heat treatment. In the process of vacuum heat treatment, the blades are prone to collide and overlap. After vacuum heat treatment, the blades are prone to bonding or recrystallization on the surface. Therefore, special tooling must be used to isolate the blades from each other to ensure that the bl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/00C21D1/773C30B33/02C30B29/52B22C9/04B22C3/00
CPCB22C3/00B22C9/04C21D1/773C21D9/0068C30B29/52C30B33/02
Inventor 胡北楼琅洪姜卫国董加胜王栋郑伟王迪
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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