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Preparation method of calcium-oxide-based ceramic core

A ceramic core and calcium oxide-based technology, applied in the field of calcium oxide-based core and its preparation, can solve the problems of long production cycle, complex titanium alloy precision casting process, hydration and the like, and achieve low cost and good hydration resistance. The effect of simple performance and preparation process

Active Publication Date: 2013-02-13
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The content of zirconia in the above-mentioned core is relatively large, and zirconia is a stable compound, which is insoluble in acid-base solution. Therefore, it is difficult to remove the core of the core, and because the core contains a certain amount of calcium oxide, the core Also facing the problem of hydration during use
[0004] The titanium alloy precision casting process is complex and the production cycle is long. In the process of shell making and other processes, the core needs to be in contact with the water-containing paint, and the calcium oxide ceramic core will generate powdered calcium hydroxide after absorbing water, which will cause the core to collapse and cannot continue to be used.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Embodiment 1: adopt the preparation method provided by the present invention to prepare calcium oxide-based ceramic core, specifically comprise the following steps:

[0026] Step 1. Prepare calcium oxide suspension: add 0.1 kg of polyethylene glycol to 10 L of absolute ethanol to form the first mixed solution, add 1 kg of calcium oxide powder to the first mixed solution, and stir to prepare the calcium oxide suspension;

[0027] Step 2. Prepare the rare earth oxide precursor solution: take a certain amount of zirconium oxychloride and put it into a container filled with absolute ethanol for heating, add a hydrogen peroxide solution with a mass percentage concentration of 25%, and stir to prepare the molar mass percentage Concentration is the zirconia precursor solution of 22mol / L;

[0028] Step 3, adding the zirconia precursor solution to the prepared calcium oxide suspension, stirring to obtain the second mixed solution, wherein the ratio of the amount of the rare eart...

Embodiment 2

[0038] Step 1. Prepare calcium oxide suspension: add 1 kg of polyoxyethylene amine to 10 L of absolute ethanol to form a first mixed solution, add 20 kg of calcium oxide powder to the first mixed solution, and stir to prepare a calcium oxide suspension;

[0039] Step 2, preparing the rare earth oxide precursor solution: take a certain amount of yttrium chloride and put it into a container filled with absolute ethanol for heating, add a hydrogen peroxide solution with a mass percentage concentration of 20%, and stir to prepare a molar mass percentage concentration of 0.01 The yttrium oxide precursor solution of mol / L;

[0040] Step 3: Add the yttrium oxide precursor solution to the prepared calcium oxide suspension, and stir to obtain the second mixed solution, wherein the ratio of yttrium chloride to calcium oxide powder is 0.005:1

[0041] Step 4, adding ammonia water to the second mixed solution and adjusting the pH value of the solution to 11 to obtain the third mixed solut...

Embodiment 3

[0050] Step 1. Preparation of calcium oxide suspension: Add 0.5kg fatty acid polyoxyethylene ester to 10L absolute ethanol to form the first mixed solution, add 7kg calcium oxide powder to the first mixed solution, and stir to prepare calcium oxide suspension ;

[0051] Step 2, prepare the rare earth oxide precursor solution: take the mixture of zirconium oxychloride and yttrium nitrate, put it into a container filled with absolute ethanol and heat it in a water bath, add a hydrogen peroxide solution with a mass percentage concentration of 20%, and stir to prepare molar The zirconium oxide / yttrium oxide precursor solution that mass percent concentration is 5mol / L;

[0052] Step 3, adding the zirconia / yttrium oxide precursor solution to the prepared calcium oxide suspension, stirring to obtain the second mixed solution, wherein the ratio of the amount of zirconium oxychloride, yttrium nitrate and calcium oxide powder is 0.5:1;

[0053] Step 4, adding ammonia water to the seco...

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Abstract

The invention discloses a preparation method of a calcium-oxide-based ceramic core, and belongs to the technical field of precision casting of titanium alloy. The preparation method of the calcium-oxide-based ceramic core comprises the following steps of firstly preparing rare-earth-oxide-coated calcium oxide powder; secondly modeling and sintering the rare-earth-oxide-coated calcium oxide powder; and finally obtaining the calcium-oxide-based ceramic core, wherein the calcium-oxide-based ceramic core is prepared from the following raw materials in percentage by weight: 5-15% of plasticizer, 0.001-20% of mineralizer, and the balance of rare-earth-oxide-coated calcium oxide powder bodies, and the sum of the raw materials is 100% in percentage by weight. The calcium-oxide-based ceramic core prepared by the method disclosed by the invention has excellent mechanical properties and can effectively prevent the defect that calcium oxide is easy to hydrate when meeting water.

Description

technical field [0001] The invention relates to a calcium oxide-based core and a preparation method thereof, belonging to the technical field of titanium alloy precision casting. 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. With the development of large-scale aircraft projects and various new engine development projects in my country, the shape and structure of titanium alloy precision castings are becoming more and more complex, often with complex inner cavities. higher requirement. [0003] At present, alumina and silica-based ceramic cores, which have been widely studied, are not suitable for the field of titanium alloy precision casting because the ...

Claims

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Application Information

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IPC IPC(8): C04B35/057C04B35/622C04B35/628C04B35/632
Inventor 吴国清周朋朋赵嘉琪南海
Owner BEIHANG UNIV
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