Easy-to-remove ceramic core, and preparation method and application thereof

A ceramic core and removal technology, applied in cores, casting molding equipment, casting molds, etc., can solve problems such as poor performance of ceramic substrates, and achieve the effects of small dimensional changes, improved thermal shock resistance, and low prices.

Active Publication Date: 2020-08-25
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] As a rare earth metal oxide, lanthanum oxide has a melting point of 2315°C. Because of its good physical and chemical properties, it has been widely used in civil, military and high-tech fields, and it is expected to become a raw material for the preparation of ceramic cores. However, Lanthanum oxide powder exposed to the air easily absorbs carbon dioxide and water, and gradually turns into lanthanum carbonate, resulting in poor performance of the ceramic matrix

Method used

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  • Easy-to-remove ceramic core, and preparation method and application thereof

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preparation example Construction

[0022] The invention provides a method for preparing an easy-to-remove ceramic core, comprising the following steps:

[0023] (1) mixing lanthanum oxide powder, calcium oxide powder and zirconium oxide powder to obtain a mixed material;

[0024] (2) Dry pressing the mixed material to obtain a biscuit;

[0025] (3) Sintering the green compact to obtain an easy-to-remove ceramic core.

[0026] The invention mixes lanthanum oxide powder, calcium oxide powder and zirconium oxide powder to obtain a mixed material. In the present invention, the mass ratio of the lanthanum oxide powder, calcium oxide powder and zirconium oxide powder is preferably (60-80): (5-10): (10-30), more preferably (65-75): (6~8): (20~25).

[0027] In the present invention, the particle size of the lanthanum oxide powder is preferably 100-325 mesh, more preferably 200 mesh. In the present invention, before the mixing, it is also preferred to pre-calcine the lanthanum oxide powder, the temperature of the pr...

Embodiment 1

[0044] The lanthanum oxide powder of 200 meshes pre-fired, the calcium oxide powder of 200 meshes, the zirconia powder of 2000 meshes and the PVB ethanol liquid are mixed by ball milling to make a mixed material; in the mixed material, the addition amount of the lanthanum oxide powder is 80wt %, the addition of calcium oxide powder is 5wt.%, the addition of zirconia powder is 10wt.%, the addition of PVB ethanol liquid is 5wt.%; the balls used for mixing in the ball mill are zirconia balls, The ball-to-material ratio is 2:1, and the ball-milling mixing time is 12 hours; when the ball-milling mixing is completed, the obtained powder is sieved to get zirconia balls, and then the under-sieve is dried at 120°C to obtain mixed materials;

[0045] Prepare the ceramic core by dry pressing, put the mixed material into a stainless steel mold, obtain the required ceramic core blank on a mechanical press, control the pressure of dry pressing to 20MPa, and keep the pressure for 2min, get ...

Embodiment 2

[0048] The 200 mesh lanthanum oxide powder, the 200 mesh calcium oxide powder, the 2000 mesh zirconium oxide powder and the PVB ethanol liquid that have been pre-fired are ball milled and mixed to make a mixed material; in the mixed material, the added amount of the lanthanum oxide powder is 75wt %, the addition of calcium oxide powder is 5wt.%, the addition of zirconia powder is 15wt.%, the addition of PVB ethanol liquid is 5wt.%; the balls used for mixing in the ball mill are zirconia balls, The ball-to-material ratio is 2:1, and the ball-milling mixing time is 12 hours; when the ball-milling mixing is completed, the obtained powder is sieved to get zirconia balls, and then the under-sieve is dried at 120°C to obtain mixed materials;

[0049] Prepare the ceramic core by dry pressing, put the mixed material into a stainless steel mold, obtain the required ceramic core blank on a mechanical press, control the pressure of dry pressing to 20MPa, and keep the pressure for 2min, ...

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Abstract

The invention relates to the technical field of ceramic cores, in particular to an easy-to-remove ceramic core, and a preparation method and application thereof. The preparation method of the easy-to-remove ceramic core comprises the following steps: mixing lanthanum oxide powder, calcium oxide powder and zirconium oxide powder to obtain a mixed material; carrying out dry pressing molding on the mixed material to obtain a biscuit; and sintering the biscuit to obtain the easy-to-remove ceramic core. According to the invention, lanthanum oxide is used as matrix powder, and calcium oxide and zirconium oxide react with lanthanum oxide in the sintering process, so it is guaranteed that the ceramic core is stored for a longer time, and removal of the ceramic core is facilitated. The prepared ceramic core is small in size change, easy to remove, high in refractoriness and good in thermal shock resistance.

Description

technical field [0001] The invention relates to the technical field of ceramic cores, in particular to an easy-to-remove ceramic core and its preparation method and application. Background technique [0002] With the development of high-temperature alloy hollow blade manufacturing technology for aero turbine engines, in order to effectively improve the air cooling efficiency of the blade, the design of the cooling channel of the hollow blade is extremely complicated. The formation of such a complex inner cavity structure must not only ensure its dimensional accuracy, but also It is necessary to ensure that the ceramic core forming the inner cavity is easily removed without damaging the hollow blade. Therefore, it is urgent to develop an easy-to-remove ceramic core with near zero shrinkage that is suitable for working in multiple environments and multiple conditions. [0003] As a rare earth metal oxide, lanthanum oxide has a melting point of 2315°C. Because of its good phys...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/50C04B35/64B22C9/10B22C1/00B22C9/24
CPCB22C1/00B22C9/10B22C9/24C04B35/50C04B35/64C04B2235/3208C04B2235/3244C04B2235/6562C04B2235/6567C04B2235/96C04B2235/9615
Inventor 余建波张振强张家斌李霞王江
Owner SHANGHAI UNIV
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