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A kind of coating for titanium and titanium alloy casting and preparation method thereof

A technology for titanium alloys and coatings, applied in casting and molding equipment, metal processing equipment, coatings, etc., can solve the problems of high manufacturing cost, coating peeling, long production cycle, etc., and achieve long service life, stable performance and simple method. Effect

Inactive Publication Date: 2016-04-13
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 paint: a. Firstly, weigh 195g ammonium zirconium carbonate, 700g zirconium dioxide, 97g hafnium dioxide, 4g sodium oxide, 0.5g ferric oxide and 3g silica;

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

[0017] c After stirring evenly, add 4g of sodium oxide, 0.5g of ferric oxide and 3g of silica, and continue to stir for 2 hours. The viscosity of the paint is measured at 25°C to be 12.7cPs, and the paint preparation is completed.

[0018] Shell preparation: After the coating is prepared, coat the cleaned wax mold with a surface coating. After the paint is fully dried and hardened, the back layer is coated. The back layer is usually coated 8-12 times. The last time, only the coating slurry is stuck, without sanding. When the back layer is dried to 80%-90%, the electrothermal method is used to dewax. During the dewaxing process, the wax in the cavity should...

Embodiment 2

[0028] Preparation of paint: 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 of ammonium zirconium carbonate into the paint bucket, while stirring, add 600g of zirconium dioxide and 150g of 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. The viscosity of the paint is measured at 25°C to be 13cPs, and the paint preparation is completed. The life of the obtained paint is the same as the result of the paint life test obtained in Example 1, and both are greater than or equal to 20 days. The physical properties of the coating: under 25℃, the viscosity is 13cPs and the density is 3.5g / cm 3 , Appearance is colorless or light yellow transparent liquid.

Embodiment 3

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

[0033] b Then pour 220g of ammonium zirconium carbonate into the paint bucket, add 800g of zirconium dioxide while stirring;

[0034] c After stirring evenly, add 2.7g sodium oxide, 0.6g ferric oxide and 2.7g silicon dioxide, and continue to stir for 3 hours. The viscosity of the paint is measured at 25°C to be 11.9cPs, and the paint preparation is completed. The life of the obtained paint is the same as the result of the paint life test obtained in Example 1, and both are greater than or equal to 20 days. The physical properties of the coating: at 25°C, the viscosity is 11.9cPs and the density is 2.8g / cm 3 , 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 adhesives that can be used as 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 and the process is relatively mature. But its biggest problem is: First, 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 configured well. After that, it must be used up immediately. If you want to prevent it from gelling, it must be frozen and stored immediately. Even so, it can only be stored for 2 to 3 days;...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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