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Rare earth coated and magnesium oxide based ceramic core

A magnesia-based ceramic and rare earth coating technology, applied in the direction of core, casting mold, casting mold composition, etc., can solve problems such as core collapse, avoid thermal cracking, simple core removal equipment, and reduce costs.

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
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Effect test

Embodiment 1

[0027] A rare earth-coated magnesia-based ceramic core, which is composed of the following raw materials in weight percentage:

[0028] 10wt% mineralizer, 17wt% plasticizer, 1.5wt% polyethylene powder, and the rest is rare earth-coated magnesium oxide powder;

[0029] The mineralizer is composed of silicon dioxide, magnesium oxide and titanium dioxide in a mass ratio of 1:1:1;

[0030] Described plasticizer is made up of the raw material of following weight part:

[0031] Paraffin wax 90, propolis 3, terpene resin 4, polyethylene oxide 2, silane coupling agent KH550 0.2;

[0032] Heat and soften the above terpene resin, 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;

[0033] The preparation method of described rare earth coated magnesium oxide comprises the following steps:

[0034] (1) Add magnesium oxide and kh570 silane coupling agent to glycerin, and ball mil...

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Abstract

The invention discloses a rare earth coated and magnesium oxide based ceramic core which is characterized by comprising the following raw materials by weight percent: 5% to 10% of mineralizer, 10% to 17% of plasticizer, 1% to 1.5% of polyethylene powder and the balance being rare earth coated magnesium oxide powder. The ceramic core disclosed by the invention can be preferably dissolved in acid and has the advantages of short stripping time, simple stripping equipment, no pollution in a stripping process, safety, reliability and good high-heat resistant performance, the precision casting cost is reduced, and the phenomenon of heat cracks generated in the process of casting hollow thin-wall castings is avoided.

Description

technical field [0001] The invention mainly relates to the field of precision casting, in particular to a rare earth-coated magnesium oxide-based 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, magnesium 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 ...

Claims

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Application Information

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IPC IPC(8): B22C9/10C04B35/04C04B35/63C04B35/622
Inventor 姜银珠高博王伟赵夫涛
Owner WUHU ZHEXIN NEW ENERGY
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