Silicon-based ceramic core preparation method

A ceramic core and silicon-based technology, applied in the field of ceramic cores, can solve the problems of softening and denaturation, reducing the dimensional accuracy of the inner cavity of the blade, and increasing the deflection at high temperature.

Active Publication Date: 2016-07-06
兴化市兴东铸钢有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the content of cristobalite is low, the creep resistance of the ceramic core will be poor, and the ceramic core will soften and denature under the action of molten metal
Increasing the sintering temperature can increase the cristobalite content of the ceramic core after firing. If the final firing temperature is too low, the cristobalite conversion content of silica is too low, which will cause the core's room temperature strength and high temperature strength to be low.
[0027] Second: During the sintering process, if the temperature rises too fast, the conversion rate of cristobalite will be low, which will lead to th

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0059] Example 1: A method for preparing a silicon-based ceramic core includes powder configuration and mixing steps, slurry preparation steps, compression molding steps, and sintering steps.

[0060] The steps of powder configuration and mixing include weighing and mixing a certain proportion of quartz glass powder, zircon powder, and cristobalite powder according to the mass to obtain a mixture of quartz glass powder, zircon powder, and cristobalite powder;

[0061] The steps of preparing the slurry include adding a plasticizer composed of paraffin wax, beeswax, and high-pressure polyethylene in a certain mass ratio, heating and melting the plasticizer, adding the quartz glass powder and zirconium prepared in the steps of powder configuration and mixing The mixture of powder and cristobalite powder is stirred to obtain slurry;

[0062] The compression molding step includes injection molding the slurry prepared in the slurry preparation step to form a silicon-based ceramic core emb...

Example Embodiment

[0083] Example 2: The difference from Example 1 is that the ceramic core powder formula is formulated and the weight percentage is: 93% fused silica glass powder; 5% zircon powder; 2% cristobalite powder. According to the weight percentage of 10kg ceramic core powder as an example, the ratio of the ceramic core powder is 9.3kg quartz glass powder, 0.5kg zircon powder and 0.2kg cristobalite powder.

Example Embodiment

[0084] Example 3: The difference from Example 1 is that the ceramic core powder formula is formulated, and the weight percentage is: 93% fused silica glass powder, 4% zircon powder, and 3% cristobalite powder. According to the weight percentage of the ceramic core powder prepared by 10kg, the ratio of the prepared ceramic core powder is 9.3kg quartz glass powder, 0.4kg zircon powder, and 0.3kg cristobalite powder.

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PUM

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Abstract

The invention discloses a silicon-based ceramic core preparation method. The method comprises the following steps: powder configuration and mixing, slurry preparation, compression moulding and sintering, wherein the sintering step comprises the following processes: wax melting, gasification, intensified gasification, cristobalite transitional change, cristobalite change and final sintering. The silicon-based ceramic core prepared by using the preparation method is good in creep resistance, low in high temperature deflection, low in shrinking percentage, high in strength, high in porosity, and easy for core leach.

Description

technical field [0001] The invention relates to a ceramic core, in particular to a method for preparing a silicon-based ceramic core. Background technique [0002] The ceramic core is the abbreviation of a ceramic core used in the investment casting process. As an adapter to form the cavity of the casting, its function is to form the inner cavity structure of the casting, and together with the external mold and the mold shell, ensure the casting Dimensional accuracy requirements for the cavity. Ceramic cores are usually used to form the cavity of castings with complex shapes or difficult to form, as a special process method to simplify process difficulty, reduce cost and improve product qualification rate. [0003] Silicon-based ceramic cores have the advantages of small expansion coefficient, excellent resistance to rapid cooling and rapid heating, high mechanical strength, good chemical stability and easy core removal, etc., and are widely used in hollow turbine blades, a...

Claims

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Application Information

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IPC IPC(8): C04B35/14C04B35/622C04B35/64C04B35/632C04B35/634
CPCC04B35/14C04B35/622C04B35/632C04B35/63408C04B35/63496C04B35/64C04B2235/3244C04B2235/656C04B2235/661
Inventor 周长军孙革唐荣俊唐荣彪
Owner 兴化市兴东铸钢有限公司
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