Anti-interface reaction composite ceramic shell

A composite ceramic and interfacial reaction technology, applied in the directions of molds, cores, mold components, etc., can solve the problems of short slurry life, difficult process control, and inability to use steam to dewax, and achieve excellent coating and hanging performance. High shell strength and stable performance

Inactive Publication Date: 2013-03-06
SHENYANG RES INST OF FOUNDRY
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  • Claims
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AI Technical Summary

Problems solved by technology

However, the wet strength of this kind of shell is only 50% of that of the conventional shell. The binder expands with water vapor and cannot be dewaxed with steam. The life of the slurry is short. The pH value of the slurry must be strictly controlled. gelled

Method used

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Embodiment Construction

[0036] A composite ceramic shell of anti-interface reaction, including a surface layer and a reinforcement layer.

[0037] The surface layer is composed of inner surface layer 1 and outer layer 2. The inner surface layer is made of yttrium oxide powder with a particle size of ≤320 mesh as refractory powder and 100 mesh yttrium oxide sand as refractory aggregate. The thickness of the inner surface layer is 0.10-0.55mm .

[0038] The particle size of yttrium oxide powder in the outer layer is ≤320 mesh, the particle size of yttrium oxide sand is 80 mesh, and the thickness of the outer layer is 0.35-0.85mm.

[0039] The reinforcement layer consists of five sub-reinforcement layers and a sealing layer.

[0040] The first reinforcement layer 3 has a particle size of fused mullite ≤ 320 mesh, a particle size of fused corundum sand of 46 mesh, and a thickness of 0.75-1.20 mm.

[0041] The second reinforcement layer 4 has a particle size of fused mullite ≤ 320 mesh, a particle size of...

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Abstract

The invention relates to an anti-interface reaction composite ceramic shell. The shell consists of a surface layer and a reinforcing layer, the surface layer is made of yttria powder as refractory powder, yttria sand as refractory aggregate and silica sol as binder by adopting a multi-coating method, the reinforcing layer is made of electro-fused mullite powder as refractory powder, electro-fused corundum sand as refractory aggregate and silica sol as binder by adopting the multi-coating method, the reinforcing layer is fixed on the top surface of the surface layer, and the reinforcing layer and the surface layer are of an integrated structure; the total thickness of the shell is 5mm to 13mm, wherein the thickness of the surface layer is 0.15mm to 1.4mm. After the shell produced by the method is roasted, the surface of the cavity of the shell is smooth and does not have cracks, the surface does not have floating sand and floating powder, and the shape of a blade wax pattern is completely and clearly copied.

Description

technical field [0001] The invention relates to an anti-mold shell interface reaction composite ceramic mold shell. Specifically, it is a composite ceramic shell that increases the inertness of the surface layer of the ceramic shell, eliminates the interface physical and chemical reactions between the shell and the superalloy, and ensures the excellent surface quality and dimensional accuracy of the casting. Background technique [0002] With the development of aviation, aerospace, marine and ground gas turbine power generation industries, the power plant gas turbines used in these fields are also continuously developed and improved to increase their thrust or efficiency, which is the core hot end of aeroengines and heavy gas turbines. Components ─ directional or single crystal blades have put forward higher requirements. In order to ensure dimensional accuracy, reduce casting post-processing procedures, and save costs, most of these parts are formed by precision casting, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C9/04B22C1/18B22C3/00
Inventor 娄延春于波苏贵桥刘孝福李长春郭新力
Owner SHENYANG RES INST OF FOUNDRY
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