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Method for manufacturing inert coating layer on surface of ceramic core

A technology for ceramic cores and manufacturing methods, which is applied in cores, manufacturing tools, casting molds, etc., and can solve the problem of poor high-temperature chemical stability of silicon oxide ceramic cores, absence of alumina-based ceramic cores, and alumina-based ceramic cores. Get rid of problems such as difficulties, achieve huge economic value and social value, not easy to crack, and eliminate the effect of reaction

Inactive Publication Date: 2019-06-25
SHENYANG LIMING AERO-ENGINE GROUP CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them: the removal of alumina-based ceramic cores is difficult, and high-temperature and high-pressure equipment is required. There is no efficient and environmentally friendly removal method and removal equipment for alumina-based ceramic cores in China.
Silica-based ceramic cores have the advantages of small thermal expansion coefficient, easy core removal, and wide range of high-temperature adaptability. They are widely used in the precision casting industry. C, Mg, Y, Ti, Al, Hf and other elements react

Method used

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  • Method for manufacturing inert coating layer on surface of ceramic core
  • Method for manufacturing inert coating layer on surface of ceramic core
  • Method for manufacturing inert coating layer on surface of ceramic core

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] A method for manufacturing an inert coating layer on the surface of a ceramic core, which coats the surface of a silicon-based ceramic core with an inert layer, avoids direct contact between the core and a high-temperature alloy to cause thermochemical reactions, and solves the problem of the reaction between the core and the alloy.

[0051] The inert layer coated on the surface of the silicon-based ceramic core meets the following requirements: aluminum sol and zirconium sol are selected as the coating agent. The models and performance indicators of aluminum sol and zirconium sol meet the requirements of Table 1:

[0052] Table 1 Models and performance indicators of aluminum sol and zirconium sol

[0053]

[0054] Specifically, a combination of aluminum sol A1, aluminum sol A2, aluminum sol A3, zirconium sol G1, and zirconium sol G2 is selected.

[0055] The typical application scheme of the manufacturing method of the inert coating layer on the surface of the cera...

Embodiment 2

[0069] The content of this embodiment is basically the same as that of Embodiment 1, and its difference mainly lies in:

[0070] The baking process curve requirements are as follows (such as figure 1 shown):

[0071] First raise the temperature to 40-70°C, bake for 0.2-1h, then raise the temperature to 70-120°C, and dry for 0.5-2h; then cool down to below 50°C with the furnace and leave the oven.

Embodiment 3

[0073] A method for manufacturing an inert coating layer on the surface of a ceramic core, which coats the surface of a silicon-based ceramic core with an inert layer, avoids direct contact between the core and a high-temperature alloy to cause thermochemical reactions, and solves the problem of the reaction between the core and the alloy.

[0074] The inert layer coated on the surface of the silicon-based ceramic core meets the following requirements: aluminum sol and zirconium sol are selected as the coating agent. The models and performance indicators of aluminum sol and zirconium sol meet the requirements of Table 1:

[0075] Table 1 Models and performance indicators of aluminum sol and zirconium sol

[0076]

[0077] Specifically, a combination of aluminum sol A1, aluminum sol A2, aluminum sol A3, zirconium sol G1, and zirconium sol G2 is selected.

[0078] The typical application scheme of the manufacturing method of the inert coating layer on the surface of the cera...

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Abstract

A method for manufacturing an inert coating layer on the surface of a ceramic core is characterized in that the surface of the silicon-based ceramic core is coated with the inert layer to avoid directcontact and a thermochemical reaction of the core and a high-temperature alloy, so the reaction problem of the core and the alloy is solved. A silicon-based ceramic core having an excellent thermochemical stability at a high temperature and easily removed is produced. The method for manufacturing the inert coating layer on the surface of the ceramic core is suitable for the production of heavy-duty gas turbine blades easily reacted with the core, and is also suitable for the production of aeroengine guide vanes; and the produced core has large expected economic and social values, and has a broad application prospect.

Description

Technical field: [0001] The invention relates to the application field of ceramic core precision casting technology, and in particular provides a method for manufacturing an inert coating layer on the surface of a ceramic core. Background technique: [0002] Modern aero-engines are developing toward high thrust-to-weight ratios. The most effective way to increase the thrust-to-weight ratio of the engine is to increase the temperature of the front inlet of the turbine, and the use of hollow air-cooled cast blades is the most effective means to increase the working temperature of the turbine blades. [0003] With the development of high-temperature alloy technology and the increasingly complex shape of the inner cavity of the blade, the chemical stability and high-temperature performance of the ceramic core forming the inner cavity structure of the blade are increasingly required. At present, ceramic cores for hollow blades are mainly divided into silica-based ceramic cores a...

Claims

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Application Information

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IPC IPC(8): C04B41/89B22C9/12B22C9/10
Inventor 张玲刘建平杜洪强黄静王石磊
Owner SHENYANG LIMING AERO-ENGINE GROUP CORPORATION
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