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Preparation method of yttrium oxide moulding shell used for casting

A technology of yttrium oxide and precision casting, which is applied in the direction of casting molding equipment, casting molds, and casting mold components, etc. It can solve the problems that the yttrium oxide shell cannot be dewaxed by steam, can not be dewaxed by steam, and the material remelts when it encounters water. Improve dimensional stability and high temperature strength, facilitate preparation and storage, and reduce the effect of reaction

Active Publication Date: 2017-03-15
SHANGHAI SPACE PRECISION MACHINERY RES INST
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Problems solved by technology

[0010] The purpose of the present invention is to solve the technical problem that the yttrium oxide shell prepared by yttrium sol and zirconium acetate binder cannot be dewaxed by steam, and propose a new type of yttrium oxide shell and its preparation method, which can effectively improve the yttrium oxide shell The disadvantage of not being able to steam dewax is solved, which solves the shortcomings of the existing mold shell preparation and dewaxing process, which exist in the process of re-dissolving in water and poor air permeability of the mold shell.

Method used

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  • Preparation method of yttrium oxide moulding shell used for casting
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preparation example Construction

[0037] A preparation method for an yttrium oxide mold shell for titanium alloy precision casting, comprising the following steps:

[0038](1) Preparation of surface coating: Weigh refractory powder, binder, wetting agent and defoamer, wherein the mass ratio of refractory powder to binder (powder-liquid ratio) is 2~5, wetting The volume of the agent is 0.05%~0.5% of the volume of the binder, and the volume of the defoamer is 0.1%~0.6% of the volume of the binder. The refractory powder is yttrium oxide powder less than 325 meshes obtained after crushing and screening, the binder is ammonium zirconium carbonate, the wetting agent is JFC, and the defoaming agent is n-octanol. Add the weighed refractory powder into the binder and stir for 3h~8h, then add the weighed wetting agent and defoamer into the surface coating, and continue stirring for 12h~48h to obtain titanium alloy precision casting Topcoat with yttrium oxide type shells.

[0039] (2) Preparation of transition layer co...

Embodiment 1

[0045] A preparation method for an yttrium oxide mold shell for titanium alloy precision casting, comprising the following steps:

[0046] (1) Preparation of surface coating: weigh 3Kg of refractory powder, measure 1L of binder, 1mL of wetting agent and 2mL of defoamer. The refractory powder is fused yttrium oxide less than 325 meshes, the binder is ammonium zirconium carbonate, the wetting agent is JFC, and the defoaming agent is n-octanol. Add the weighed refractory powder into the binder and stir for 8 hours, then add the weighed wetting agent and defoamer into the surface coating, and continue stirring for 16 hours to obtain the yttrium oxide type for titanium alloy precision casting. Shell topcoat. The temperature of the working environment for the preparation of the surface coating is controlled at 20°C, the relative humidity is controlled at 50%, the temperature of the surface coating is controlled at 15°C, and the flow cup viscosity of the top coating is controlled at...

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Abstract

The invention discloses a preparation method of an yttrium oxide moulding shell used for titanium alloy precision casting. A moulding shell surface layer coating comprises yttrium oxide refractory powder, ammonium zirconium carbonate binder, a wetting agent and a defoaming agent. The preparation method includes the steps of preparation of the surface layer coating, preparation of a back layer coating, preparation of the moulding shell, dewaxing, calcinations and the like. By means of the yttrium oxide moulding shell used for titanium alloy precision casting and the preparation method thereof, the problems that an existing moulding shell is prone to redissolution under the influence of water in the preparation and dewaxing processes, and steam dewaxing cannot be achieved are solved. The binder used for the coating is made of ammonium zirconium carbonate and is low in price, and the prepared coating is stable and reliable and cannot generate redissolution after being dried under the influence of water. The prepared surface layer coating is good in smearing performance and high in refractoriness, steam dewaxing is adopted, no pollution is caused to the environment, and the prepared surface layer moulding shell has no influence on the human health. The prepared yttrium oxide moulding shell is wide in application range, an interface reaction layer is small, titanium alloy casts are high in precision, performance is excellent, and later-period finishing is conducted easily.

Description

technical field [0001] The invention relates to a mold shell for precision casting and a preparation method thereof, in particular to a yttrium oxide mold shell for titanium alloy precision casting and a preparation method thereof, and belongs to the technical field of investment precision casting mold shell preparation. Background technique [0002] Titanium and its alloys have a series of excellent properties, such as high specific strength, high heat resistance, excellent corrosion resistance and shape memory, hydrogen storage, weldability, superconductivity, non-magnetic, etc., are high-quality light metal structural materials And important functional materials, known as "the third rising metal". [0003] Precision casting is an advanced manufacturing technology for titanium alloy parts. It is a near-net shape technology. It has the advantages of high dimensional accuracy, good surface quality, little or no machining allowance, and high production efficiency. It can gr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C3/00B22C9/04B22C7/02
CPCB22C3/00B22C7/02B22C9/04
Inventor 范李鹏王宝兵李宝辉余国康何凯陆丰玮张娜谢剑锋顾辉旺杨剑
Owner SHANGHAI SPACE PRECISION MACHINERY RES INST
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