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Paint for casting titanium and titanium alloy as well as preparation method thereof

A titanium alloy and coating technology, which is applied in casting molding equipment, metal processing equipment, coating, etc., can solve the problems of high manufacturing cost, long production cycle, easy gelation, etc., and achieve long service life, simple method and low price Effect

Inactive Publication Date: 2014-08-06
WENZHOU HONGDIAN TITANIUM PROD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the biggest problem it has is: firstly, the coating slurry is unstable, especially the zirconium acetate-yttrium oxide slurry is very easy to gel, and gelation often occurs during the configuration process. Even if gelation does not occur, the slurry is well prepared. It must be used up immediately after use. If it does not gel, it must be frozen and stored immediately. Even so, it can only be stored for 2 to 3 days. Secondly, zirconium acetate is not water-resistant. It is mixed with yttrium oxide or zirconia powder. The slurry coating is not as stable and strong as the coating of ethyl silicate and silica sol. When it meets water after drying, it will dissolve back, causing the coating to fall off and bulge.
In 2010, the supplier of ammonium zirconium carbonate in Taiwan, in order to promote the binder, took it to Hebei Hengshui Wuyi Kimet Precision Casting Co., Ltd. for testing. The result ended in failure. It was impossible to cast qualified castings at all, and the casting rate was very low. Only 5%-10%, the surface of the casting is dark brown, and it is necessary to continuously add ammonia water to adjust and stabilize the coating slurry during use, and the working environment is extremely harsh
[0003] At present, domestic enterprises that mainly produce chemical valves and pump bodies mostly use machining graphite type production, which has high manufacturing cost, long production cycle, and it is difficult to guarantee the quality and performance of castings, polluting the environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0015] Preparation of coating: a first weigh 195g ammonium zirconium carbonate, 700g zirconium dioxide, 97g hafnium dioxide, 4g sodium oxide, 0.5g ferric oxide and 3g silicon dioxide;

[0016] b then pour 195g ammonium zirconium carbonate into the paint bucket, while stirring, add 700g zirconium dioxide and 97g hafnium dioxide;

[0017] c After stirring evenly, add 4g of sodium oxide, 0.5g of ferric oxide and 3g of silicon dioxide, and continue to stir for 2 hours. Measure the viscosity of the paint at 25°C to 12.7cPs, and the paint is prepared.

[0018] Form shell preparation: After the coating is prepared, the wax mold after cleaning is coated with the fine coating. After the paint is fully dried and hardened, the back layer is painted and hung. The back layer is usually painted and hung 8-12 times, and the last time only sticks the paint slurry without sanding. When the back layer is dried to 80%-90%, use the electric heating method to dewax. During the dewaxing process, t...

Embodiment 2

[0028] Preparation of coating: a first weigh 180g ammonium zirconium carbonate, 600g zirconium dioxide, 150g hafnium dioxide, 3g sodium oxide, 0.6g ferric oxide and 3g silicon dioxide;

[0029] b then pour 180g ammonium zirconium carbonate into the paint bucket, while stirring, add 600g zirconium dioxide and 150g hafnium dioxide;

[0030] c After stirring evenly, add 3g of sodium oxide, 0.6g of ferric oxide and 3g of silicon dioxide, and continue to stir for 4 hours. Measure the viscosity of the paint at 25°C to 13cPs, and the paint is prepared. The service life of the obtained paint is the same as the test result of the paint life obtained in Example 1, which is greater than or equal to 20 days. Physical properties of the coating: at 25°C, the viscosity is 13cPs and the density is 3.5g / cm 3 , the appearance is colorless or light yellow transparent liquid.

Embodiment 3

[0032] Preparation of coating: a first weigh 220g ammonium zirconium carbonate, 800g zirconium dioxide, 2.7g sodium dioxide, 0.6g ferric oxide and 2.7g silicon dioxide;

[0033] B then 220g ammonium zirconium carbonate is poured in the paint bucket, while stirring, add 800g zirconium dioxide;

[0034] c After stirring evenly, add 2.7g of sodium oxide, 0.6g of ferric oxide and 2.7g of silicon dioxide, and continue to stir for 3 hours. Measure the viscosity of the paint at 25°C to 11.9cPs, and the paint is prepared. The service life of the obtained paint is the same as the test result of the paint life obtained in Example 1, which is greater than or equal to 20 days. Physical properties of the coating: at 25°C, the viscosity is 11.9cPs and the density is 2.8g / cm 3 , the appearance is colorless or light yellow transparent liquid.

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Abstract

The invention relates to paint for casting titanium and titanium alloy as well as a preparation method thereof. The paint for casting the titanium and the titanium alloy comprises the following components, and the relative mass proportional relation of the components is as follows: the mass ratio of zirconium carbonate to refractory aggregate powder to surface active agent is 18-22: 75-80: 0.6-0.8; the refractory aggregate powder is zirconium dioxide or a mixture of zirconium dioxide and hafnium oxide; the surface active agent consists of sodium oxide, iron trioxide and silicon dioxide; the mass ratio of sodium oxide to iron trioxide to silicon dioxide in the surface active agent is 8-10: 1-2: 6-10. The paint has the advantages of simple components, stable performance, difficult gel appearance, long service life and low production cost.

Description

technical field [0001] The invention relates to a coating, in particular to a coating for titanium and titanium alloy casting and a preparation method thereof. Background technique [0002] At present, there are three kinds of binders that can be used in the titanium alloy investment casting process in the world: zirconium acetate, ammonium zirconium carbonate and yttrium sol. Among them, zirconium acetate has been used for casting titanium and titanium alloy castings since the 1960s. It has been nearly 70 years so far, and the technology is relatively mature. But the biggest problem it has is: firstly, the coating slurry is unstable, especially the zirconium acetate-yttrium oxide slurry is very easy to gel, and gelation often occurs during the configuration process. Even if gelation does not occur, the slurry is well prepared. It must be used up immediately after use. If it does not gel, it must be frozen and stored immediately. Even so, it can only be stored for 2 to 3 da...

Claims

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Application Information

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IPC IPC(8): B22C3/00
Inventor 王美聪谢成木张孝祥王小云王星张孝友
Owner WENZHOU HONGDIAN TITANIUM PROD
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