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Mold case for producing high-temperature alloy single crystal blades

A high-temperature alloy and single-crystal blade technology, which is applied in the field of a heat-conducting formwork for the manufacture of high-temperature alloy single-crystal blades, can solve problems such as high production costs, cumbersome operations, and difficult production, and achieve improved thermal conductivity, faster cooling speed, Improving the effect of heat and temperature conditions

Inactive Publication Date: 2013-07-10
DONGFANG TURBINE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, this method only improves the heat dissipation from the surface of the mold shell to the surrounding environment, and does not reduce the thermal resistance of the mold shell itself. It is still difficult for the heat of the metal casting to pass from the inner surface of the mold shell to the outer surface, and the liquid metal bath is cold. The additional equipment of the method is huge, the operation is cumbersome, and tons of tin or Al need to be melted and overheated as a liquid coolant, and the production cost is very high, so it is difficult to apply it to production

Method used

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  • Mold case for producing high-temperature alloy single crystal blades
  • Mold case for producing high-temperature alloy single crystal blades

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Embodiment 1, the method of using silicon carbide as a whole to make a heat-conducting formwork

[0022] Preparation: use silicon carbide powder as powder, silica sol as binder, add other auxiliary materials (such as wetting agent and defoamer) to mix slurry, and use silicon carbide particles as sand material.

[0023] Production Method:

[0024] 1) Assemble the blade wax mold 1 according to the usual method to form the inner cavity of the mold shell.

[0025] 2) The surface layer and the back layer of the silicon carbide mold shell 2 are made by using the ordinary investment casting method on the outer surface of the blade wax mold 1 by using the method of sanding with slurry.

[0026] 3) After the silicon carbide mold shell 2 is dried, dewaxing and burning of residual wax are carried out by the usual method, and the calcination strengthening is carried out in an air atmosphere.

[0027] 4) The silicon carbide mold shell 2 is preheated and kept warm in a vacuum furna...

Embodiment 2

[0029] Embodiment two, use graphite and pottery to make the method for heat conduction formwork

[0030] Use ceramics to make the surface layer of the thermally conductive formwork:

[0031] 1) Assemble the blade wax mold 1 according to the usual method to form the inner cavity of the mold shell.

[0032] 2) The ceramic surface layer 4 is made on the outer surface of the blade wax mold 1 by using a common precision casting method, using corundum powder slurry and sand material, and adopting the method of sticking slurry and pouring sand.

[0033] Use graphite to make the back layer of the thermally conductive formwork:

[0034] 3) Use graphite as powder, silica sol as binder, add other auxiliary materials (such as wetting agent and defoamer) to mix slurry, and use graphite particles as sand material.

[0035] 4) Use the ordinary precision casting method on the outer surface of the ceramic surface layer 4, use the slurry and sand material in step 3), and use the method of sti...

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Abstract

The invention provides a mold case for producing high-temperature alloy single crystal blades in the directional solidification process. The surface layer of the mold case corresponds to a high-temperature alloy melt in the mold case, and the back layer of the mold case is made of a good heat conductor material which is silicon carbide or graphite. Then the back layer is made of silicon carbide, the surface layer of the mold case is made of silicon carbide or ceramic. When the back layer is made of graphite, the surface layer of the mold case is made of ceramic. According to the mold case which is made of the heat conduction material and used for producing high temperature alloy single crystal blades, the graphite and the silicon carbide serve as good heat conductors, the heat conducting properties of the graphite and the silicon carbide are much higher than those of ceramic materials and even obviously better than those of high-temperature alloys, so that the heat conducting property of the mold case is improved by more than one magnitude order, the cooling rate of a casting is greatly accelerated, the temperature condition of directional solidification is improved obviously, and the yield of single crystal or directional column crystal blades is improved.

Description

technical field [0001] The invention relates to precision casting of high-temperature alloy components, in particular to a heat-conducting mold shell used for manufacturing high-temperature alloy single-crystal blades. Background technique [0002] At present, the mold shell material for manufacturing high-temperature alloy blades is ceramics, mainly Al2O3, and its thermal conductivity is very poor. Especially, the mold shells of large blades for heavy-duty gas turbines are very thick, resulting in too slow cooling during the solidification process of the blades, and it is impossible to build high The temperature gradient ensures the formation of single crystal structure. The world is actively developing new processes to improve the heat dissipation during the blade solidification process, the most famous of which is liquid metal cooling, that is, a heated liquid metal molten pool is set under the bottom of the furnace, and the mold shell is lowered into the pool to dissipat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D27/04
Inventor 马德新杨功显巩秀芳
Owner DONGFANG TURBINE CO LTD
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