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Ceramic core for hollow casting

A ceramic core and casting technology, which is applied in the field of precision casting, can solve problems such as core collapse, and achieve the effects of low core breaking rate, good dimensional accuracy, and high temperature thermal stability

Inactive Publication Date: 2014-10-01
WUHU ZHEXIN NEW ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The cores prepared by the above patents undergo a hydration reaction when exposed to water, causing the cores to collapse. Therefore, the above cores are difficult to be practically applied in the field of titanium alloy precision casting

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A hollow casting ceramic core is characterized in that it is made up of the raw materials in the following weight percentages:

[0031] 21wt% mineralizer, 20wt% plasticizer, 0.3wt% cerium oxide, 0.2wt% oleic acid, and the rest is rare earth coated composite powder;

[0032] The mineralizer is titanium dioxide with a fineness of 50-200 μm;

[0033] Described plasticizer is made up of the raw material of following weight part:

[0034] Paraffin wax 90, propolis 3, terpene resin 4, polyethylene oxide 1, silane coupling agent KH550 0.2;

[0035] Heat the above-mentioned terpene resin to soften, add polyethylene oxide, stir evenly, add the remaining raw materials, stir and disperse at 800 rpm for 4 minutes, cool and discharge to obtain the plasticizer;

[0036] The preparation method of the rare earth coating composite comprises the following steps:

[0037] (1) Select silica with a fineness of 70-100 μm, polyethylene powder with a fineness of 150-200 μm, and alumina with...

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PUM

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Abstract

The invention discloses a ceramic core for a hollow casting. The ceramic core is characterized by comprising the following raw materials by weight percent: 16%-21% of a mineralizer, 15%-20% of a plasticizer, 0.2%-0.3% of cerium oxide, 0.1%-0.2% of oleic acid and the balance of rare earth-coated composite powder. The ceramic core is low in core breaking rate, free of cracks, low in shrinkage rate, high in high-temperature strength, good in high-temperature thermal stability and high in size precision, is capable of manufacturing thin-wall castings with complicated cavities, and is especially suitable for manufacturing high-pressure turbine blades.

Description

technical field [0001] The invention mainly relates to the field of precision casting, in particular to a hollow casting ceramic core. Background technique [0002] The complex inner cavity of the alloy casting is mainly formed by using a prefabricated ceramic core, and it is removed after the casting is cast. The technological process is as follows: preparation of pottery core, preparation of wax mold containing pottery core, shell making, shell dewaxing and roasting, alloy casting, and core removal. As we all know, with the development of large aircraft projects and various new engine development projects in my country, higher requirements are put forward for the shape, structure and performance of titanium alloy precision castings. [0003] At present, silicon oxide and silicon oxide-based ceramic cores, which have been widely studied, are difficult to apply to the field of titanium alloy precision casting because the core materials do not have good chemical reaction...

Claims

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Application Information

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IPC IPC(8): C04B35/14C04B35/10C04B35/628
Inventor 高博王伟姜银珠赵夫涛
Owner WUHU ZHEXIN NEW ENERGY
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