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Preparation method of oxide surface layer shell for titanium alloy precision casting

A technology of precision casting and titanium alloy, which is applied in casting molding equipment, molds, mold components, etc., can solve the problem of high cost of mold shell manufacturing, and achieve the effect of good compactness, good coating and hangability, and no impact on human health.

Active Publication Date: 2014-07-23
QINGDAO RUNQIAN HI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the large amount of high-valent oxides used in the existing process, the manufacturing cost of the shell is high, which is an important bottleneck that limits the large-scale application of titanium alloy precision castings

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A preparation method for an oxide surface layer shell for titanium alloy precision casting, comprising the following steps:

[0031] (1) Preparation of binder: Weigh 12.8g of zirconium acetate, 18.5g of zirconia, 5g of polyvinyl alcohol and 1g of silica sol, mix well, and add 0.1g of defoamer n-octanol under stirring condition of 30rmp, Stir at a constant speed for 5 minutes to obtain the adhesive;

[0032] (2) Preparation of surface layer powder: weigh 3g of zirconia, 1g of calcium oxide, and 0.5g of yttrium oxide respectively, mix them evenly, and after crushing, vibrating, and sieving, obtain a uniform powder of 150 meshes, which is the surface layer powder. Pay attention to avoid doping iron oxide during processing;

[0033] (3) Preparation of surface coating: Mix the binder and surface powder according to the mass ratio of 1.5:1, stir evenly at 15rmp for 40min, control the viscosity of the coating at 50S, and merge it for 60min to obtain the surface coating;

[0...

Embodiment 2

[0041] A preparation method for an oxide surface layer shell for titanium alloy precision casting, comprising the following steps:

[0042] (1) Preparation of binder: Weigh 25g of zirconium acetate, 25.5g of zirconia, 25g of polyvinyl alcohol and 5g of silica sol, mix well, add 1g of defoamer n-octanol under the stirring condition of 40rmp, and stir at a constant speed for 10min , to obtain the adhesive;

[0043] (2) Preparation of surface layer powder: Weigh 10g of zirconia, 5g of calcium oxide, and 1g of yttrium oxide respectively, mix them evenly, and after crushing, vibrating, and sieving, obtain a uniform powder of 170 meshes, which is the surface layer powder. Avoid doping with iron oxide during processing;

[0044] (3) Preparation of the surface coating: mix the binder and the surface powder according to the mass ratio of 2:1, stir evenly at 25rmp for 50min, control the viscosity of the coating at 60S, and merge it for 60min to obtain the surface coating;

[0045] (4)...

Embodiment 3

[0052] A preparation method for an oxide surface layer shell for titanium alloy precision casting, comprising the following steps:

[0053] (1) Preparation of binder: Weigh 45g of zirconium acetate, 30.5g of zirconia, 35g of polyvinyl alcohol and 10g of silica sol, mix well, add 5g of defoamer n-octanol under stirring condition of 50rmp, and stir at a constant speed 15min, the adhesive is obtained;

[0054] (2) Preparation of surface layer powder: Weigh 20g of zirconia, 15g of calcium oxide, and 2g of yttrium oxide respectively, mix them evenly, and after crushing, vibrating, and sieving, obtain a uniform powder of 200 meshes, which is the surface layer powder. Avoid doping with iron oxide during processing;

[0055](3) Preparation of surface coating: Mix the binder and surface powder according to the mass ratio of 2.5:1, stir evenly at 35rmp for 65min, control the viscosity of the coating at 70S, and merge it for 60min to obtain the surface coating;

[0056] (4) Preparation...

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Abstract

The invention discloses a preparation method of an oxide surface layer shell for titanium alloy precision casting. The preparation method comprises the steps of preparation of binders, preparation of surface layer powdery material, preparation of surface layer coating, preparation of a surface layer shell, shell dewaxing, shell roasting and the like; the preparation method has the beneficial effects that: the used raw material has low price and is easily available, the traditional process is improved, the using amounts of zirconium oxide and yttrium oxide are greatly reduced, the process is simplified, the preparation flow is shortened, and the labor and raw material costs are reduced; adhesive adopts silicon sol and zirconium acetate as main raw materials and is added with n-caprylic alcohol and polyvinyl alcohol, so that the surface layer coating has good coating property, can be uniformly coated on a wax mold and has good compactness; the adhesive is added with zirconium oxide fireproofing ingredient, therefore, the surface layer shell is capable of resisting high temperature; steam dewaxing is adopted to achieve the effect of no environment pollution; the prepared surface layer shell has no influence on human health, has wide application range, small interface reaction layer with thickness 0.018-0.02mm, high precision and excellent performance and is easy to realize post-finishing.

Description

technical field [0001] The invention relates to a method for preparing a surface shell, in particular to a method for preparing an oxide surface shell for titanium alloy precision casting. Background technique [0002] Titanium alloy investment casting technology was developed to meet the needs of the aerospace industry. This technology has become the most effective one in the nearly no margin forming process. For reducing production costs and mass production of large and complex parts, has great significance. The key to titanium alloy investment precision casting technology is the selection of inert oxides and the preparation of the surface shell. At present, zirconia and yttrium oxide processes are mostly used. Zirconia-based processes are mainly used in the production of civilian parts, but the surface of the titanium castings produced is thick and has a tendency to generate surface pores, while yttrium oxide processes are mainly used in aviation. The production of aero...

Claims

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Application Information

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IPC IPC(8): B22C3/00B22C1/16B22C9/04
Inventor 解宏伟
Owner QINGDAO RUNQIAN HI TECH CO LTD
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