Preparation method of ceramic core easy to release

A technology of ceramic core and graphite core, applied in the direction of core, casting molding equipment, casting mold, etc., can solve the problems of increasing the production cost of castings, long core core removal time, casting failure, etc., to reduce core core removal difficulty and simple method. , the effect of reducing production costs

Inactive Publication Date: 2018-07-27
辽宁航安型芯科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the core removal time is too long and the difficulty is too high, the production cost of castings will be greatly increased, and it may even lead to casting failure

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) Preparation of graphite core

[0024] a. Slurry preparation

[0025] Weighing by weight: spherical graphite 325 mesh 20%, spherical graphite 500 mesh 70%, spherical graphite 800 mesh 10%. The above-mentioned spherical graphite powder was mixed evenly and then put into an oven and dried at 120° C. for 12 hours. Weighing by weight: 70% of the dried spherical graphite powder, 2% of quartz glass fiber, and 28% of ceramic core plasticizer. Raise the temperature of the mixer to 100°C, add ceramic core plasticizer, and after it is completely melted, add the dried graphite into the mixer in proportion, stir for 4 hours, and take it out to obtain the graphite core slurry.

[0026] b. Forming

[0027] Put the prepared graphite core slurry into a ceramic core injection molding machine to prepare a graphite core green body.

[0028] c. Graphite core firing

[0029] The graphite core green body was embedded in 200-mesh alumina powder and fired at a firing temperature of 450...

Embodiment 2

[0038] (1) Preparation of graphite core

[0039] a. Slurry preparation

[0040] Weighing by weight: spherical graphite 325 mesh 10%, spherical graphite 500 mesh 80%, spherical graphite 800 mesh 10%. The above-mentioned spherical graphite powder was mixed evenly and then put into an oven and dried at 120° C. for 12 hours. Weighing by weight: 60% of the dried spherical graphite powder, 1% of quartz glass fiber, 1% of mullite fiber, and 38% of ceramic core plasticizer. Raise the temperature of the mixer to 100°C, add ceramic core plasticizer, and after it is completely melted, add the dried graphite into the mixer in proportion, stir for 4 hours, and take it out to obtain the graphite core slurry.

[0041] b. Forming

[0042] Put the prepared graphite core slurry into a ceramic core injection molding machine to prepare a graphite core green body.

[0043] c. Graphite core firing

[0044] The graphite core green body was embedded in 200-mesh alumina powder and fired at a firi...

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PUM

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Abstract

The invention relates to a preparation method of a ceramic core easy to release. The preparation method is mainly applied to the technical field of investment casting precision casting. The method comprises the following steps of (1) preparation of a graphite core; (2) external coating preparation and coating; and (3) sintering. In the step (1), preparation of the graphite core comprises the following steps of a, sizing agent preparation; b, forming; and c, sintering of the graphite core; in the step (2), an external coating comprises a first external coating and a second external coating. Thepreparation process of the first external coating and the second external coating comprises the following steps of putting raw materials into a planetary mill for treatment for 30 minutes, and uniformly mixing for later use; and in the step (3), the graphite core in the sintering process can be oxidized and removed, and meanwhile, the external slurry is sintered to form a compact shell, so that the structure of the ceramic core has the characteristics of being loose and multi-hole inside, and compact in appearance. The method is simple and easy to realize, and wide in application prospect, and can effectively reduce the production cost of castings.

Description

technical field [0001] The invention relates to a method for preparing an easy-to-remove ceramic core, which is mainly used in the technical field of investment precision casting. Background technique [0002] Ceramic cores are mainly used to form complex and precise inner cavities of castings in the investment precision casting process. After the casting is finished, it is generally necessary to remove the ceramic core from the casting by mechanical or chemical dissolution, so as to obtain a hollow precision casting. This process is called core removal. If the core removal time is too long and the difficulty is too high, the production cost of the casting will be greatly increased, and it may even lead to casting failure. The performance of core removal is mainly determined by the internal structure of the ceramic core and the material of the matrix material. Contents of the invention [0003] In view of this, the present invention provides a novel method for preparing ...

Claims

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Application Information

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IPC IPC(8): B22C9/10B22C1/00
CPCB22C9/10B22C1/00
Inventor 程涛李建华张立健
Owner 辽宁航安型芯科技股份有限公司
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