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Self-reacting alumina-base composite ceramic mold core for fine casting and preparation method thereof

A composite ceramic and alumina-based technology, applied in the field of refractory ceramic materials, can solve the problems of complex core manufacturing process, high performance requirements, small size, etc., achieve good thermal shock resistance, improve thermal shock resistance, shrinkage small effect

Inactive Publication Date: 2009-03-18
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This will make the manufacturing process of the core more complex, smaller in size and higher in performance requirements

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The in-situ synthetic alumina-based composite ceramic core for precision casting of the present invention is composed of raw material ingredients in weight percent:

[0020] 85% of corundum powder, 6% of kyanite powder, 1% of magnesium oxide powder, 8% of titanium dioxide powder, plus 2% carbon powder by the mass of the aforementioned raw materials as a collapsible agent.

[0021] Among them, the corundum powder is composed of powders with different particle size ratios: coarse grain: medium grain: fine grain = 1:2:1.

[0022] Mix corundum powder with different particle size ratios evenly, and then mix them evenly with magnesium oxide powder, titanium dioxide powder, kyanite powder and carbon powder. After pressing and forming, keep it at a temperature of 1350-1550°C for 5-10 hours, and get this product after cooling in the furnace. Invented ceramic core blanks.

[0023] Boil the saturated NaOH solution, put the ceramic core in it and cook for 1 to 3 hours, supplemente...

Embodiment 2

[0025] The in-situ synthetic alumina-based composite ceramic core for precision casting of the present invention is composed of raw material ingredients in weight percent:

[0026] 70% of corundum powder, 10% of kyanite powder, 0% of magnesium oxide powder, 20% of titanium dioxide powder, plus 2% carbon powder by the mass of the aforementioned raw materials as a collapsible agent.

[0027] Among them, the corundum powder is composed of powders with different particle size ratios: coarse grain: medium grain: fine grain = 1:2:1.

[0028] Mix corundum powder with different particle size ratios evenly, and then mix them evenly with magnesium oxide powder, titanium dioxide powder, kyanite powder and carbon powder. After pressing and forming, keep it at a temperature of 1350-1550°C for 5-10 hours, and get this product after cooling in the furnace. Invented ceramic core blanks.

[0029] Boil the saturated NaOH solution, put the ceramic core in it and cook for 1 to 3 hours, supplemen...

Embodiment 3

[0031] The in-situ synthetic alumina-based composite ceramic core for precision casting of the present invention is composed of raw material ingredients in weight percent:

[0032] 75% of corundum powder, 8% of kyanite powder, 2% of magnesium oxide powder, 15% of titanium dioxide powder, and 2% of the mass of the aforementioned raw materials plus carbon powder as a collapsible agent.

[0033] Among them, the corundum powder is composed of powders with different particle size ratios: coarse grain: medium grain: fine grain = 1:2:1.

[0034] Mix corundum powder with different particle size ratios evenly, and then mix them evenly with magnesium oxide powder, titanium dioxide powder, kyanite powder and carbon powder. After pressing and forming, keep it at a temperature of 1350-1550°C for 5-10 hours, and get this product after cooling in the furnace. Invented ceramic core blanks.

[0035] Boil the saturated NaOH solution, put the ceramic core in it and cook for 1 to 3 hours, supple...

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Abstract

The invention provides a self-reaction alumina-based composite ceramic core for precision casting, and a preparation method thereof. The composite ceramic core consists of alundum powder, in-situ synthesized aluminum titanate, MgTi2O5 and mullite. The composite ceramic core is prepared from the following raw materials in weight percentage: 70 to 85 percent of alundum powder with different particle sizes, 0 to 2 percent of magnesium oxide powder, 8 to 20 percent of titanium dioxide powder and 6 to 10 percent of kyanite powder, and carbon powder accounting for 1 to 3 percent of the gross mass of the four raw materials is added as an easy-breakdown agent. The method prepares the composite ceramic core through the following steps of mixing, dry-pressing, shaping and firing the raw materials at high temperature. As other raw materials are added to an alumina matrix of the invention, the prepared composite ceramic core has the advantages of good high-temperature chemical stability and thermal stability, low thermal expansion coefficient and small shrinkage factor after sintering, and meets the requirements of a ceramic core for precision casting on room temperature and high temperature strength.

Description

technical field [0001] The invention relates to the field of refractory ceramic materials, in particular to a ceramic core for precision casting, which is mainly used to form a hollow inner cavity for efficiently cooling hollow blades of a new generation of gas turbines. Background technique [0002] Modern aero-engines urgently need to improve the working performance of gas turbine engines. The first is to increase the gas temperature of the turbine, which determines the actual increase of the effective power of the power plant. For example, if the gas temperature is increased from 1200°C to 1350°C, the fuel consumption rate can be reduced by 8%. . The new generation of high-efficiency gas turbines has continuously developed hollow blades for high-efficiency cooling. The cooling structure of the blades has evolved from traditional convection, backflow, impingement holes, and film cooling to the current high-efficiency divergent air cooling method. At present, the temperatur...

Claims

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Application Information

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IPC IPC(8): C04B35/66B22C1/00C04B35/10
Inventor 覃业霞邓飞其
Owner SOUTH CHINA UNIV OF TECH
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