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A modified magnesia-based ceramic core

A magnesium oxide-based ceramic and magnesium oxide technology, applied in the field of precision casting, can solve problems such as core collapse, and achieve the effects of small size, reduced use cost, and easy control

Active Publication Date: 2016-01-27
浙江振兴阿祥集团有限公司
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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

[0029] A modified magnesia-based ceramic core, which is made up of the following raw materials in percentage by weight:

[0030] Mullite 10wt%, titanium dioxide 3wt%, sodium polyacrylate 0.4, alumina 6wt%, plasticizer 20wt%, and the balance is rare earth coated modified magnesium oxide powder;

[0031] Described plasticizer is made up of the raw material of following weight part:

[0032] Paraffin wax 90, propolis 4, silica-alumina gel 6, propylene glycol sebacate polyester 1, aluminum hydroxide powder 3, silane coupling agent KH5500.2;

[0033] Heat and melt the above paraffin, add propolis, aluminum hydroxide powder, silane coupling agent KH550, stir and disperse at 400 rpm for 12 minutes, add the rest of the raw materials, stir evenly, keep the temperature at 90°C for 35 minutes, cool and discharge , to obtain the plasticizer;

[0034] Described modified magnesium oxide powder is made up of the raw material of following weight part:

[0035] Magnesium oxide 90, aluminum ...

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PUM

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Abstract

The invention discloses a modified magnesium oxide based ceramic core. The modified magnesium oxide based ceramic core is characterized by comprising the following raw material by weight percent: 7-10wt% of mullite, 2-3wt% of titanium dioxide, 0.2-0.4 of sodium polyacrylate, 4-6wt% of aluminum oxide, 15-20wt% of plasticizer, and the balance of rare earth-coated modified magnesium oxide powder. The forming process of the ceramic core disclosed by the invention is simple and easy to control, the ceramic core with complete shape and fine size can be obtained, the thermal deformation temperature and the heat resistance are high; the added sodium polyacrylate is conductive to depoling, and the use cost is reduced.

Description

technical field [0001] The invention mainly relates to the field of precision casting, in particular to a modified 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 have good che...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/01C04B35/628
Inventor 高博王伟姜银珠赵夫涛
Owner 浙江振兴阿祥集团有限公司