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Metal-mold precision casting method for zirconium and zirconium alloy

A technology of precision casting and zirconium alloy, which is applied in the direction of casting molding equipment, metal processing equipment, cores, etc., can solve the problems of rough surface processing of casting molds, rough surface of castings, deformation of mold shells, etc., and achieve surface roughness improvement, surface Smooth and flat, the effect of reducing the chilling effect

Active Publication Date: 2013-09-25
SHENYANG RES INST OF FOUNDRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Graphite type has high thermal conductivity, has a chilling effect, and has poor yield. The cast zirconium castings have fine internal grains, uniform structure, and good performance.
In addition, graphite itself has a certain porosity, and the surface processing of the casting mold is relatively rough, which leads to the rough surface of the casting. At the same time, a layer of C contamination layer with a thickness of about tens of microns will be formed on the surface.
The above surface quality problems lead to poor overall surface quality of machined graphite cast zirconium castings, so it is necessary to reserve more machining allowances, resulting in waste of materials
The ceramic type investment casting process is made of inert high temperature resistant ceramic materials as the casting material and prepared by investment casting technology. It is characterized by high casting surface quality, especially suitable for complex thin-walled zirconium castings. It is more complicated and cumbersome, and the molding cycle is longer. In addition, due to the limited thickness of the shell coating and the limited strength of the shell, it is easy to deform or even break the shell during the preparation of larger zirconium alloy castings, making molding more difficult.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A metal mold precision casting method for zirconium and zirconium alloys, taking the production of a zirconium alloy plug valve with a material grade of 702C as an example, the process steps are as follows:

[0021] (1) The cast steel material is used as the casting mold material, and the cast steel block is processed into a mold by mechanical processing according to the casting process drawing. After the mold processing is completed, sandblasting is used to remove surface rust and other residues, and then the surface is cleaned with alcohol or acetone to remove oil and other dirt. Finally, the metal mold is preheated to 120°C and cooled to room temperature.

[0022] (2) Using the vacuum consumable shell melting method, first put the consumable electrode with the brand name R60702 into the vacuum consumable electrode shell solidification furnace, the gap between the consumable electrode and the inner wall of the crucible is 40-120 mm, start Vacuum pump, pumped to a vac...

Embodiment 2

[0024] A metal mold precision casting method for zirconium and zirconium alloys, taking the zirconium alloy check valve whose material grade is 702C as an example, the process steps are as follows:

[0025] (1) The cast copper material is used as the casting mold material, and the cast copper block is processed into a mold by mechanical processing according to the casting process drawing. After the mold processing is completed, sandblasting is used to remove surface rust and other residues, and then the surface is cleaned with alcohol or acetone to remove oil and other dirt. Finally, the metal mold is preheated to 120°C and cooled to room temperature.

[0026] (2) The metal type coating is composed of 50 wt% yttrium oxide, 9 wt% zirconia, 40% wt% zirconium acetate solution (concentration is 40 wt%), 0.5 wt% surfactant JFC and 0.5 wt% defoamer n-butanol % prepared. The particle size of the powder is less than 270 mesh, and it is stirred for 4 hours. The ambient temperature i...

Embodiment 3

[0030] A metal mold precision casting method for zirconium and zirconium alloys, taking the zirconium alloy pump body whose material grade is 705C as an example, the process steps are as follows:

[0031] (1) Cast iron material is used as the casting material, and the cast iron block is processed into a casting mold by mechanical processing according to the casting process drawing. After the mold processing is completed, sandblasting is used to remove surface rust and other residues, and then the surface is cleaned with alcohol or acetone to remove oil and other dirt. Finally, the metal mold is preheated to 120°C and cooled to room temperature.

[0032](2) The metal type coating is prepared from 68wt% yttrium oxide, 30wt% zirconium acetate solution (concentration: 40wt%), 1wt% surfactant JFC and 1wt% defoamer n-butanol. The particle size of the powder is less than 270 mesh, and it is stirred for 4 hours. The ambient temperature is controlled at 16~28°C, the humidity is contr...

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Abstract

The invention provides a metal-mold precision casting method for zirconium and zirconium alloy. The metal-mold precision casting method includes processing a metal mold, painting a high-temperature resistant coating on the inner surface of a mold cavity of the metal mold, and pouring zirconium alloy liquid into the metal mold by a vacuum-arc-remelting kish smelting method. The high-temperature resistant coating comprises, by weight, 55-70% of fire-proof powder, 30-45% of binder, 0.1-1% of surface active agent and 0.1-1% of antifoaming agent. The fire-proof powder is composed of one of Y2O3 (yttrium oxide) powder and ZrO2 (zirconium oxide) powder. The metal mold is simple in technique and convenient to process, and has wide material sources and service life of 10-50 times; for small-batch zirconium and zirconium alloy, production cycle is short and production efficiency is high.

Description

technical field [0001] The invention relates to a metal mold precision casting process method for zirconium and zirconium alloys. Background technique [0002] Zirconium and zirconium alloys have excellent corrosion resistance, good water and steam corrosion resistance, most strong acid and alkali corrosion resistance, low thermal neutron absorption cross section, good compatibility with nuclear fuel, and high specific strength , good processing performance, so it is widely used in chemical equipment and nuclear reactor facilities and other fields. Zirconium and zirconium alloys have strong activity in the molten state, and can chemically react with almost all refractory materials to varying degrees, and can also react with O 2 , N 2 、H 2 and CO 2 Such gases undergo chemical reactions, reducing the surface and internal quality of zirconium castings. Therefore, zirconium and zirconium alloy casting technology has high requirements for casting materials and casting eq...

Claims

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Application Information

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IPC IPC(8): B22D13/00B22D13/10B22C3/00
Inventor 谢华生赵军刘时兵刘宏宇史昆刘鸿宇
Owner SHENYANG RES INST OF FOUNDRY
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