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Rare earth coated calcium oxide based ceramic core

A calcium oxide-coated, ceramic core technology, applied in the field of precision casting, can solve problems such as core collapse, achieve good core removal ability, reduce use cost, and good chemical stability

Active Publication Date: 2014-11-05
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

[0027] A rare earth-coated calcium oxide-based ceramic core is characterized in that it is composed of the following raw materials in weight percentage:

[0028] Mineralizer 12wt%, plasticizer 17wt%, oleic acid 1.4wt%, the rest is rare earth coated calcium oxide powder;

[0029] Described mineralizer is silicon dioxide;

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

[0031] Paraffin wax 90, propolis 34, terpene resin 4, polyethylene oxide 2, silane coupling agent KH550 0.1;

[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 calcium oxide comprises the following steps:

[0034] (1) Mix calcium oxide and titanium dioxide, ball mill and sieve to obtain a particle size of 70 μm to obtain a basic powder;

[0035] (2) A...

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Abstract

The invention discloses a rare earth coated calcium oxide based ceramic core, which is characterized by being composed of the following raw materials by weight: 6-12wt% a mineralization agent, 10-17wt% of a plasticizer, 1-1.4wt% of oleic acid, and the balance rare earth coated calcium oxide powder. The product has enough room temperature, high temperature strength, good chemical stability, low firing shrinkage and linear expansion rate, adopts rare earth coated calcium oxide as aggregate and has very good core removal ability, thus reducing the use cost.

Description

technical field [0001] The invention mainly relates to the field of precision casting, in particular to a rare earth-coated calcium 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, calcium 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 material does not hav...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/01C04B35/46C04B35/628
Inventor 姜银珠高博王伟赵夫涛
Owner WUHU ZHEXIN NEW ENERGY
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