Process for protecting surface of high temp. titanium alloy

A high-temperature titanium alloy, high-temperature anti-oxidation technology, applied in the surface protection of high-temperature titanium alloy, enamel powder for electrophoretic coating, can solve the problems of easy hypertrophy edges, preset enamel layer thickness, etc.

Inactive Publication Date: 2006-01-25
SHENYANG POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the glazing method of enamel coating generally adopts the method of spraying paint slurry a

Method used

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  • Process for protecting surface of high temp. titanium alloy
  • Process for protecting surface of high temp. titanium alloy
  • Process for protecting surface of high temp. titanium alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0092] Powder ratio: Al 2 o 3 6.5, ZrO 2 4.2, ZnO 5.3, B 2 o 3 4.3, CaO 3.8, Na 2 O 1.9, CeO 2 -2.0, Mg(NO 3 ) 2 5.6, ZrSiO 4 15.8, Na 2 B 4 o 7 8.0, SiO 2 and other impurities.

[0093] The powder of the described ratio is wet-milled in anhydrous ethanol in a planetary ball mill, and the rare earth oxide is added by grinding, with a concentration of 485g / L and a rotating speed of 325r / min. 50% Wt, mass ratio of large balls: small balls: medium balls = 1:3:5 during ball milling, ball milling for 200 hours.

[0094] Electrophoresis pre-coating enamel coating, electrophoresis voltage 23V; deposition time 4s; electrode spacing 2.5cm, no stirring;

[0095] Sintering: temperature 850°C, holding time 25min.

[0096] Effect of powder particle size on the quality of electrophoresis preset enamel layer.

[0097] Under the conditions of the above powder ratio, the electrophoretic deposition process has strict requirements on the particle size of the powder. The par...

Embodiment 2

[0099] Powder ratio: CeO 2 The addition of the compound is 1.0~2.0%, and others are identical with embodiment 1.

[0100] The powder of the described ratio is wet-milled in anhydrous ethanol in a planetary ball mill, and the rare earth oxide is added by grinding, with a concentration of 485g / L and a rotating speed of 325r / min. 50% Wt, large balls: small balls: medium balls = 1:3:5 mass ratio during ball milling, ball milling for 300 hours.

[0101] Electrophoresis pre-coating enamel coating, electrophoresis voltage 23V; deposition time 4s; electrode spacing 2.5cm, no stirring;

[0102] Sintering: temperature 850°C, holding time 25min.

[0103]Effect of milling addition of rare earth oxides on surface roughness of enamel coatings.

[0104] This invention relates to rare earth oxide CeO 2 Effect on surface roughness of sintered enamel coatings. Image 6 Add CeO to mill 2 content on the surface roughness of the enamel coating, it can be seen that CeO 2 The addition amount ...

Embodiment 3

[0106] Powder ratio: Al 2 o 3 8.0, ZrO 2 3.0, ZnO 6.0, B 2 o 3 3.5, CaO 2.8, Na 2 O 2.0, CeO 2 1.5, Mg(NO 3 ) 2 4.1, ZrSiO 4 14.0, Na 2 B 4 o 7 6.3, SiO 2 and other impurities.

[0107] The powder of the proportion is wet-milled in anhydrous ethanol in a planetary ball mill, and the rare earth oxide is added by grinding, with a concentration of 500g / L and a rotating speed of 300r / min. 50%wt%, large balls: small balls: medium balls = 1: 2.8: 5.2 mass ratio during ball milling, ball milling for 200 hours.

[0108] Electrophoresis pre-coating enamel coating, electrophoresis voltage 23V; deposition time 4s; electrode spacing 2.5cm, no stirring;

[0109] Sintering: temperature 850°C, holding time 25min.

[0110] Different from ordinary enamel coatings, various metal salt additives are added in the powder of the present invention, such as Mg(NO 3 ) 2 、Na 2 B 4 o 7 , ZrSiO 4 These substances play a great role in improving the bonding strength of the enamel...

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Abstract

A surface protecting method for refractory Ti-alloy includes such steps as preparing a refractory enamel proportionally containing Al, Si, Ca, Zn, Zr, Na, Mg, Ce and O, coating it on the surface of Ti-alloy by electrophoresis, and sintering.

Description

Technical field: [0001] The invention relates to the high-temperature protection technology of titanium and its alloys, and particularly provides an enamel powder for electrophoretic coating, a preparation method thereof, and a high-temperature protective coating prepared by using the enamel powder for surface protection of high-temperature titanium alloys. Background technique: [0002] Due to the high activity of titanium and its alloys, it is very easy to oxidize at high temperatures, so one of the important factors affecting the service life of high-temperature titanium alloys is that as the use temperature increases, faster oxidation reactions occur in the air environment, and the surface of the alloy cannot form The protective oxide makes a large number of oxygen atoms solid-dissolve in the matrix under the oxide, thus forming a brittle oxygen-rich layer, which seriously damages the mechanical properties of the alloy. Therefore, research on the oxidation resistance of ...

Claims

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Application Information

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IPC IPC(8): C03C8/00C23D5/00
Inventor 张春华张松杨洪刚张希川
Owner SHENYANG POLYTECHNIC UNIV
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