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Method for preparing zirconium and zirconium alloy investment precision casting oxide ceramic molding shell

A technology of investment precision casting and oxide ceramics, which is applied in casting molding equipment, casting molds, casting mold components, etc., to achieve the effects of simple shell-making process, high-temperature chemical stability, high-temperature strength, and high quality.

Active Publication Date: 2011-01-19
西安泵阀总厂有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the biggest technical difficulty of zirconium alloy investment casting is to make investment casting shells with high temperature resistance, high chemical stability, high strength and high surface finish.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0009] Embodiment 1: The production material grade is 702C, the impeller casting of model XCA100-125-400 centrifugal pump, and the process is as follows:

[0010] (1) Preparation of surface coating: Add fused Y2O3 powder with a finely graded particle size into the binder, stir while adding, and stir for 1 hour after adding all the Y2O3 powder, and control the viscosity of the slurry at 70-100s ; After the slurry is prepared, immerse the wax mold of the casting in the slurry for 10-15 minutes and take it out. When the remaining slurry on the wax mold flows evenly and no longer drips continuously, the fused Y 2 o 3 The powder is evenly sprinkled on the wax mold coated with the slurry, and the sanding should be uniform and comprehensive. After drying, the above-mentioned coating and sanding processes are carried out on this basis, and repeated 1 to 2 times. Among them, electrofusion Y 2 o 3 The particle size of powder and coarse powder is 200-300 mesh, the particle size of fin...

Embodiment 2

[0016] Embodiment 2: Take the production of 705C pump body castings as an example. The process is as follows:

[0017] (1) Preparation of surface coating: Add fused Y2O3 powder with a finely graded particle size into the binder, stir while adding, and stir for 1 hour after adding all the Y2O3 powder, and control the viscosity of the slurry at 70-100s ; After the slurry is prepared, immerse the wax mold of the casting in the slurry for 10-15 minutes and take it out. When the remaining slurry on the wax mold flows evenly and no longer drips continuously, the fused Y 2 o 3 The powder is evenly sprinkled on the wax mold coated with the slurry, and the sanding should be uniform and comprehensive. After drying, the above-mentioned coating and sanding processes are carried out on this basis, and repeated 1 to 2 times. Among them, electrofusion Y 2 o 3 The particle size of powder and coarse powder is 200-300 mesh, the particle size of fine powder is <300 mesh, the weight ratio of ...

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Abstract

The invention relates to a method for preparing a zirconium and zirconium alloy investment precision casting oxide ceramic molding shell. At present, the most common methods for casting of active organic metal and alloy comprise machining graphite mold casting and investment precision casting. The most serious technological difficulty of the zirconium alloy investment precision casting is to manufacture an investment precision casting molding shell which has the advantages of high-temperature resistance, high chemical stability, high strength and high surface finish. The process of the invention comprises the following steps of: (1) preparing a coating, immersing a wax mould into paste, coating the paste, and coating a back layer; (2) removing wax by drying; and (3) roasting the coating in an electric furnace. The molding shell has the advantages of superior high-temperature chemical stability and high-temperature strength and can bear the high temperature of over 2,000 DEG C. A zirconium and zirconium alloy casting produced by using the shell manufacturing process has high surface quality, surface roughness Ra of less than or equal to 3.2mu m and surface pollution layer thickness of less than 100mu m. The complex zirconium and zirconium alloy casting with wall thickness of less than 3mm can be produced.

Description

technical field [0001] The invention relates to a preparation process for an oxide ceramic mold shell used in zirconium and zirconium alloy investment casting precision casting. Background technique [0002] Zirconium and zirconium alloys are relatively expensive metal materials, which have excellent corrosion resistance in many strong corrosive media and good mechanical properties. At present, zirconium material has been widely used as a special corrosion-resistant material, especially in reducing acidic medium with high concentration and high temperature, zirconium material is the first choice material for chemical equipment manufacturing. Zirconium material has high melting point, low thermal conductivity and small linear expansion coefficient. Zirconium material is very active at high temperature, and can react with almost all refractory materials to varying degrees, and at high temperature, zirconium material is very easy to react with CO 2 , O 2 , N 2 and H 2 The ...

Claims

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Application Information

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IPC IPC(8): B22C9/04B22D21/02B22D21/06
Inventor 黄湘云朱广
Owner 西安泵阀总厂有限公司
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