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Fast manufacturing method for powder-coated and calcium-oxide-based ceramic mould

A powder-coated calcium oxide-based and coated calcium-oxide technology is applied in the field of rapid manufacturing of powder-coated calcium oxide-based ceramic casting molds, which can solve the problems affecting the preparation and use of calcium oxide ceramics, calcium oxide is easy to absorb moisture and is not suitable for Handling and storage problems, to achieve the effect of improving hydration resistance or oxidation resistance, easy storage and preservation, and close thermal expansion coefficient

Active Publication Date: 2016-11-09
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, calcium oxide is easy to absorb moisture and hydrate in the air, so it is not suitable for transportation and storage, which seriously affects the preparation and use of calcium oxide ceramics.

Method used

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  • Fast manufacturing method for powder-coated and calcium-oxide-based ceramic mould

Examples

Experimental program
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Effect test

Embodiment 1

[0055] A method for rapidly manufacturing nylon-coated calcium oxide-based ceramic molds, comprising the following steps:

[0056] 1) Preparation of resin mold

[0057] Using light-curing rapid prototyping technology, a resin mold for a certain type of hollow turbine blade ceramic casting was prepared;

[0058] 2) Mix the coarse and fine calcium oxide powder

[0059] Coarse (40 μm) and fine (2 μm) calcium oxide powders are uniformly mixed in a mass ratio of 1:1;

[0060] 3) Preparation of powder organic solution

[0061] Uniformly mixing the silane coupling agent with absolute ethanol to prepare an organic solution, the mass fraction of the silane coupling agent in the organic solution is 5%, and the mass fraction of absolute ethanol is 95%;

[0062] 4) Organic calcium oxide powder

[0063] Add the well-mixed calcium oxide powder into the organic solution and mix evenly, then place the mixed material at room temperature for 3 hours, and then dry it in an oven at 60°C until...

Embodiment 2

[0082] A method for rapidly manufacturing polytetrafluoroethylene-coated calcium oxide-based ceramic molds, comprising the following steps:

[0083] 1) Preparation of resin mold

[0084] Using light-curing rapid prototyping technology, a resin mold for a certain type of hollow turbine blade ceramic casting was prepared;

[0085] 2) Mix the coarse and fine calcium oxide powder

[0086] Coarse (40 μm) and fine (2 μm) calcium oxide powders are uniformly mixed in a mass ratio of 1:1;

[0087] 3) Preparation of powder organic solution

[0088] Uniformly mixing the silane coupling agent with absolute ethanol to prepare an organic solution, the mass fraction of the silane coupling agent in the organic solution is 5%, and the mass fraction of absolute ethanol is 95%;

[0089] 4) Organic calcium oxide powder

[0090] Add the uniformly mixed calcium oxide powder into the organic solution and mix evenly, then place the mixed material at room temperature for 4 hours, and then dry it i...

Embodiment 3

[0107] A method for rapidly manufacturing a nylon-coated calcium oxide-based core-shell integrated ceramic mold, comprising the following steps:

[0108] 1) Preparation of resin mold

[0109] Using light-curing rapid prototyping technology, a resin mold for a certain type of hollow turbine blade ceramic casting was prepared;

[0110] 2) Mix the coarse and fine calcium oxide powder

[0111] Coarse (40 μm) and fine (2 μm) calcium oxide powders are uniformly mixed in a mass ratio of 1:1;

[0112] 3) Preparation of powder organic solution

[0113] Uniformly mixing the silane coupling agent with absolute ethanol to prepare an organic solution, the mass fraction of the silane coupling agent in the organic solution is 5%, and the mass fraction of absolute ethanol is 95%;

[0114] 4) Organic calcium oxide powder

[0115] Add the well-mixed calcium oxide powder into the organic solution and mix evenly, then place the mixed material at room temperature for 5 hours, and then dry it i...

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Abstract

The invention discloses a fast manufacturing method for a powder-coated and calcium-oxide-based ceramic mould, and belongs to the technical field of fast precision casting. According to the method, the photocuring 3D printing technology is applied to manufacturing of the required mould; meanwhile the surface of calcium oxide powder is subjected to hydration-resisting material coating by applying the powder coating technology; the hydration problem of the calcium oxide powder in the water-based gel casting process is effectively solved; and the method can be successfully used for preparing the calcium-oxide-based ceramic mould of a complex internal structure. The sintering performance and the hydration-resisting capability of the calcium-oxide-based ceramic mould are improved by adding a moderate amount of a mineralizer. The powder-coated and calcium-oxide-based ceramic mould prepared by means of the method is good in overall performance, casting requirements for a new generation of niobium silicon based high-temperature alloy blades or titanium-aluminum alloy blades can be met, a mould core is easy to remove, and the technical problems that monox-based mould cores and aluminum-oxide-based mould cores are hard to remove and high in rejection rate are solved.

Description

technical field [0001] The invention belongs to the technical field of rapid precision casting, and in particular relates to a rapid manufacturing method of a powder-coated calcium oxide-based ceramic mold. Background technique [0002] With the development of high-performance aerospace vehicles, the operating temperature of the hot-end parts of aero-engines has been continuously increasing, and has gradually exceeded the limit temperature of the existing nickel-based and cobalt-based superalloys. New ultra-high-temperature alloy materials such as niobium-silicon-based alloys, Titanium-aluminum intermetallic compounds are expected to become materials for the next generation of turbine blades. However, the melting point of the niobium-silicon-based alloy will exceed 1800°C, which has exceeded the maximum service temperature of the commonly used silicon oxide-based and alumina-based ceramic cores and molds. Titanium-aluminum intermetallic compounds have high chemical activity...

Claims

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Application Information

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IPC IPC(8): B28B1/08B28B1/087C04B35/628C04B35/057C04B35/64
CPCC04B35/057C04B35/628C04B35/64B28B1/082B28B1/087C04B2235/6023
Inventor 李涤尘杨强鲁中良黄福享陈义张航
Owner XI AN JIAOTONG UNIV
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