Water-based high-temperature-resistant titanium-steel anti-bonding coating and use thereof

Abstract

The invention relates to a coating for preventing intermetallic bonding, in particular to a water-based high-temperature-resistant titanium-steel anti-bonding coating and its use in the preparation process of titanium ingot. The water-based high-temperature-resistant titanium-steel anti-bonding coating of the invention includes the following components in parts by weight: 50-150 parts of water-based film-forming agent, 0-50 parts of Zn powder, 400-450 parts of Al.sub.2O.sub.3 powder, and 250-350 parts of talcum powder. The coating of the invention can avoid the bonding reaction with a roller or a winch of the steel equipment in the rolling or perforation process of a titanium tube at 900 C., so as to improve the yield and the production efficiency of titanium material processing. Moreover, the process is simple and easy to operate, the coating is environment-friendly and pollution-free, and easy to prepare.

Claims

1. A water-based high-temperature-resistant titanium-steel anti-bonding coating, comprising the following components in parts by weight: 50-150 parts of a water-based film-forming agent, 0-50 parts of a Zn powder, 400-450 parts of an Al.sub.2O.sub.3 powder, 250-350 parts of a talcum powder, 1-2 parts of a curing agent, 0.5-1 part of a dispersant, and 1-5 parts of water.

2. The water-based high-temperature-resistant titanium-steel anti-bonding coating according to claim 1, comprising the following components in parts by weight: 50-150 parts of the water-based film-forming agent, 10-50 parts of the Zn powder, 400-450 parts of the Al.sub.2O.sub.3 powder, 250-350 parts of the talcum powder, 1-2 parts of the curing agent, 0.5-1 part of the dispersant, and 1-5 parts of water.

3. The water-based high-temperature-resistant titanium-steel anti-bonding coating according to claim 1 consisting of the following components in parts by weight: 50-150 parts of the water-based film forming agent, 10-50 parts of the Zn powder, 400-450 parts of the Al.sub.2O.sub.3 powder, 250-350 parts of the talcum powder, 1-2 parts of the curing agent, 0.5-1 part of the dispersant and 1-5 parts of water.

4. The water-based high-temperature-resistant titanium-steel anti-bonding coating according to claim 1, wherein the water-based film-forming agent is at least one of epoxy resin, water-based polyurethane paint, water-based acrylic latex paint or water-based alkyd paint.

5. The water-based high-temperature-resistant titanium-steel anti-bonding coating according to claim 1, wherein the curing agent is at least one of SiO.sub.2, water glass or Al.sub.2 (HPO.sub.4).sub.3, and the dispersant is at least one of polyvinyl alcohol, hydrolyzed maleic anhydride or barium stearate, and preferably polyvinyl alcohol.

6. The water-based high-temperature-resistant titanium-steel anti-bonding coating according to claim 1, wherein a pH value of the water-based high-temperature-resistant titanium-steel anti-bonding coating is 7.5-9.5; and the solid content is 85-90%.

7. The water-based high-temperature-resistant titanium-steel anti-bonding coating according to claim 1, comprising the following components in parts by weight: 50-150 parts of the water-based film-forming agent, 0-50 parts of the Zn powder, 400-450 parts of the Al.sub.2O.sub.3 powder, 250-350 parts of the talcum powder, 1 part of the curing agent, 0.5 part of the dispersant, and 5 parts of water.

8. The water-based high-temperature-resistant titanium-steel anti-bonding coating according to claim 1 comprising the following components in parts by weight: 50-150 parts of the water-based film-forming agent, 10-50 parts of the Zn powder, 400-450 parts of the Al.sub.2O.sub.3 powder, 250-350 parts of the talcum powder, 1 part of the curing agent, 0.5 part of the dispersant, and 5 parts of water.

9. The water-based high-temperature-resistant titanium-steel anti-bonding coating according to claim 1 comprising the following components in parts by weight: 100 parts of the water-based film-forming agent, 50 parts of the Zn powder, 450 parts of the Al.sub.2O.sub.3 powder, 350 parts of the talcum powder, 1-2 parts of the curing agent, 0.5-1 part of the dispersant, and 1-5 parts of water.

10. The water-based high-temperature-resistant titanium-steel anti-bonding coating according to claim 1 comprising the following components in parts by weight: 100 parts of the water-based film-forming agent, 50 parts of the Zn powder, 450 parts of the Al.sub.2O.sub.3 powder, 350 parts of the talcum powder, 1 part of the curing agent, 0.5 part of the dispersant, and 5 parts of water.

11. A method of titanium tube rolling, said method comprising coating the water-based high-temperature-resistant titanium-steel anti-bonding coating according to claim 1 on a surface of steel equipment, roller or winch to form a film layer with a thickness of 0.2-0.4 mm.

12. The method according to claim 11, wherein the coating is applied by air pressure spraying, vacuum spraying or manual brushing.

Description

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

(1) The water-based high-temperature-resistant titanium-steel anti-bonding coating of the invention comprises the following components in parts by weight: 50-150 parts of water-based film-forming agent, 0-50 parts of Zn powder, 400-450 parts of Al.sub.2O.sub.3 powder, and 250-350 parts of talcum powder.

(2) Further, as a preferred technical solution, the water-based high-temperature-resistant titanium-steel anti-bonding coating comprises the following components in parts by weight: 50-150 parts of water-based film-forming agent, 10-50 parts of Zn powder, 400-450 parts of Al.sub.2O.sub.3 powder, and 250-350 parts of talcum powder, and preferably comprising the following components in parts by weight: 100 parts of water-based film-forming agent, 50 parts of Zn powder, 450 parts of Al.sub.2O.sub.3 powder, and 350 parts of talcum powder.

(3) Further, the water-based high-temperature-resistant titanium-steel anti-bonding coating comprises the following components in parts by weight: 1-2 parts of curing agent, 0.5-1 part of dispersant and 1-5 parts of water; and preferably 1 part of curing agent, 0.5 part of dispersant and 5 parts of water.

(4) Further, as a preferred technical solution, the water-based high-temperature-resistant titanium-steel anti-bonding coating consists of the following components in parts by weight: 50-150 parts of water-based film forming agent, 10-50 parts of Zn powder, 400-450 parts of Al.sub.2O.sub.3 powder, 250-350 parts of talcum powder, 1-2 parts of curing agent, 0.5-1 part of dispersant and 1-5 parts of water; and preferably, 100 parts of water-based film-forming agent, 50 parts of Zn powder, 450 parts of Al.sub.2O.sub.3 powder, 350 parts of talcum powder, 1 part of curing agent, 0.5 part of dispersant and 5 parts of water.

(5) For the water-based high-temperature-resistant titanium-steel anti-bonding coating, the water-based film-forming agent is at least one of epoxy resin, water-based polyurethane paint, water-based acrylic latex paint and water-based alkyd paint.

(6) For the water-based high-temperature-resistant titanium-steel anti-bonding coating, the curing agent is at least one of SiO.sub.2, water glass and Al.sub.2(HPO.sub.4).sub.3, and preferably SiO.sub.2; and the dispersant is at least one of polyvinyl alcohol, hydrolyzed maleic anhydride and barium stearate, and preferably polyvinyl alcohol.

(7) Further, as a preferred technical solution, the pH value of the water-based high-temperature-resistant titanium-steel anti-bonding coating is 7.5-9.5; and the solid content is 85-90%, and preferably 87%. In this way, a uniform high-temperature anti-bonding protective film layer can be formed on the surface of rolling equipment.

(8) The invention further provides a use of the water-based high-temperature-resistant titanium-steel anti-bonding coating in titanium tube rolling.

(9) For the use of the water-based high-temperature-resistant titanium-steel anti-bonding coating in titanium tube rolling, at room temperature, the water-based high-temperature-resistant titanium-steel anti-bonding coating is coated on the surface of steel equipment, roller or winch to form a film layer with a thickness of 0.2-0.4 mm, and preferably 0.3 mm. If the film layer attached to titanium tubes is less than 0.20 mm, the coating layer will be gradually reduced in thickness due to the rotation and adhesion of titanium ingot during rolling or perforation process. Therefore, in order to ensure sufficient coating thickness and prevent the coating layer from being completely adhered to titanium tubes, titanium tubes will not be fully protected against high-temperature oxidation. If the film layer attached to titanium tubes is more than 0.40 mm, the cost will increase.

(10) For the application of the water-based high-temperature-resistant titanium-steel anti-bonding coating in titanium tube rolling, after the coating is coated on the surface of steel equipment, roller or winch by air pressure spraying, vacuum spraying or manual brushing, a formed film layer will be rapidly cured within 5-10 min at room temperature. No film layer flowing or sagging occurs because of high solid content. The coating adhesion of both wet film and dry film can meet the friction requirements of the vibrator with a titanium ingot roller way, without coating peeling or picking. There are no particular restrictions on coating method, drying method, etc. and coating method can be selected according to the actual situation on site.

(11) The water-based high-temperature-resistant titanium-steel anti-bonding coating of the invention may be prepared by common methods in the art, as long as the components are uniformly mixed. The coating may be immediately prepared before use. However, the inventors of the invention found in their research that the components could be mixed more uniformly if the water-based high-temperature-resistant titanium-steel anti-bonding coating was preferably prepared by the following method: firstly, diluting the water-based film-forming agent with water, and slowly adding Zn powder, talcum powder and Al.sub.2O.sub.3 powder while stirring; adding curing agent, and uniformly stirring; then adding dispersant while stirring until a uniform and stable phase was obtained.

(12) In the curing process, only the moisture attached to the surface of the coating should be removed, so no any accelerator is required. The coating is cured mainly by a natural curing method, and the hot air drying or induction heating can also be used to save curing time. The cured coating will not have any picking and cracking.

(13) The high-temperature-resistant principle of the coating prepared by the invention is as follows: the organic coating is to burn off slowly and Fe is to get melted and soft slowly at the temperature of 900 C.; at this time, the Al.sub.2O.sub.3 powder in the coating can be fixed on the surface of roller or winch for heat insulation; and a TiAl.sub.3 alloy layer is formed through the alloying reaction of Al and Ti in the coating. The alloy layer is so dense as to isolate the bonding reaction of the body titanium with external elements (Fe, etc.), thus achieving the effect of preventing titanium-steel bonding.

(14) There is no special restrict on the temperature for using the high-temperature-resistant titanium-steel anti-bonding coating. However, since water is taken as the solvent of the treating agent of the invention, thus the high-temperature-resistant titanium-steel anti-bonding coating could be used at room temperature as long as water does not freeze and vaporize.

(15) The invention provides a high-temperature-resistant titanium-steel anti-bonding coating that can be directly spraying on the surface of rolling winch on line and be quickly solidified to form a self-drying coating. By means of the coating, the surface of titanium tube will not bond with the surface of steel so as not to generate TiFe phase at the high temperature of 900 C. Thus, the production cost is effectively reduced, the production benefit is effectively improved, and particularly the precision size and the surface quality of the product are improved. The corresponding coating technology provided by the invention has good economic benefits, social benefits and wide application prospects.

(16) The specific embodiments of the invention will be described in detail in combination with examples, and the invention is not limited to the scope of the described examples.

Example 1

(17) The water-based high-temperature-resistant titanium-steel anti-bonding coating is prepared according to the raw materials and their weight ratios in Table 1:

(18) TABLE-US-00001 TABLE 1 Raw materials and weight ratios of water-based high-temperature- resistant titanium-steel anti-bonding coating Water-based film Raw forming Zn Al.sub.2O.sub.3 Talcum Curing materials agent/g powder/g powder/g powder/g agent/g Dispersant/g Water/g K1 100 50 450 350 1 0.5 5 K2 150 10 400 250 2 1 1 K3 50 30 450 250 1 0.5 5 K4 100 0 450 300 1 0.5 5 K5 100 50 400 250 1 0.5 5 D1 100 0 450 0 1 0.5 5 D2 100 50 0 300 1 0.5 5

(19) Among them, K1-K5 are the experimental groups, D1-D2 are the control groups, and a blank control group D3 (i.e. direct rolling without coating) is also arranged. The water-based film-forming agent is epoxy resin (solid content: 50%), the curing agent is SiO.sub.2, and the dispersant is polyvinyl alcohol. The pH value of the water-based high-temperature-resistant titanium-steel anti-bonding coating prepared by the invention is 7.5-9.5, and the solid content is 85-90%.

(20) The preparation method comprises the following steps: adding the water-based film-forming agent, Zn powder, talcum powder and Al.sub.2O.sub.3 powder to a container at normal temperature and pressure while continuously and uniformly stirring; then adding a curing agent, a dispersant and water until the solution presents a uniform stable phase, i.e. the water-based high-temperature-resistant titanium-steel anti-bonding coating.

(21) The water-based high-temperature-resistant titanium-steel anti-bonding coating prepared in the above groups is coated on the surface of steel equipment, roller or winch by air pressure spraying, vacuum spraying or manual brushing, and is naturally dried and cured at room temperature for 10-15 min to obtain a film layer with a thickness of 0.2-0.4 mm. The titanium tube is rolled at 900 C. The surface quality of the rolled titanium tube is good, and the titanium tube is not attached to the roller and winch. The specific comparison is as follows:

(22) TABLE-US-00002 TABLE 2 Test performance of water-based high-temperature-resistant titanium-steel anti-bonding coating and control groups Surface defect rate Thickness Titanium of titanium of TiFe bonding tube due to layer on rate on titanium titanium equipment bonding tube surface surface No. (%) (m) (%) K1 1 9 1 K2 2 10 2 K3 3 11 3 K4 5 13 4 K5 9 22 11 D1 12 23 13 D2 24 46 26 D3 35 249 54

(23) As can be seen from Table 2, the titanium tubes produced by the equipment sprayed with the coating of groups K1 to K5 indicate good surface quality and hardly adhere to the roller, winch and etc.; the titanium tubes produced by the equipment without any coating (i.e. the blank control group D3) have serous surface defects and the equipment must be grinded before use due to a certain degree of titanium bonding; and the titanium tubes produced by the equipment with the coating of groups D1 and D2 have high surface detect rate and cannot effectively prevent titanium-steel bonding.

(24) In case an annual production capacity of 10,000 ton is designed, about 6,300 titanium ingots will be produced each year as per the standard of 1.5 ton per titanium ingot (blank); and 100 to 200 kg will be cut from each titanium ingot as per the titanium-steel bonding depth of 5 mm to 20 mm; and the cutting part of each titanium ingot due to titanium bonding will cause a loss of 8,000-1,6000 yuan as per the price of 80,000 yuan/ton of titanium ingot. In addition, the cutting work will consume a great deal of manpower and material resources, and increase additional production cost and production time. The technology may save a large amount of production cost for titanium tubes and other titanium alloy products. Given that 2-5 kg of coating are used in the rolling process of each titanium ingot and the price of each coating is 200,000 yuan/ton, the new benefits of this technology are shown in the following formula:

(25) WProduction of titanium ingots per year: about 6,300 titanium ingots per year are produced on the basis of 10,000 tons;

(26) AAmount of each titanium ingot cut due to titanium-steel layer bonding: based on 50 kg/titanium ingot;

(27) P1Cost of titanium ingot: 80 yuan/Kg;

(28) W1Consumption of sprayed high-temperature-resistant anti-bonding coating, 3 Kg/ingot;

(29) P2Price per ton of high-temperature-resistant anti-bonding coating: based on 200 yuan/kg;

(30) YNew benefits from this technology every year:

(31) Then

(32) $\begin{array}{c}Y=\left(P1A-W1P2\right)W\\ =\left(4000-600\right)6300\\ =2142\left(10,000\mathrm{yuan}\right)\end{array}$

(33) Therefore, the coating of the invention has good economic benefits, social benefits and wide application prospects.