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Water heat electrophoresis deposition method of gradient iridium silicate coating layer

A technology of electrophoretic deposition and yttrium silicate, which is applied in the field of preparation of yttrium silicate coating, can solve the problems of difficult to meet the requirements of compactness, substrate damage, difficult control of coating uniformity, etc., and achieve thermal damage and oxidation weight loss less than , Excellent anti-oxidation performance

Inactive Publication Date: 2007-01-31
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage is that the uniformity of the coating is not easy to control, and the compactness is difficult to meet the requirements
The common feature of the above methods is that they all need high temperature to prepare a relatively ideal yttrium silicate coating, and the higher preparation temperature may cause certain damage to the substrate.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Embodiment 1: step one: the synthesis of yttrium silicate superfine powder

[0039] 1. Y 4 Si 3 o 12 Synthesis of Ultrafine Powder

[0040] 1.1 According to the molar ratio of Y:Si=2:3, mix 1.25mol / L yttrium nitrate aqueous solution and 1.87mol / L sodium silicate aqueous solution in the same container; mechanically stir at 1000r / min for 10min and place in 100W Oscillate in an ultrasonic container for 10 minutes;

[0041] 1.2 Take the same amount of 1.25mol / L yttrium nitrate aqueous solution and 3.75mol / L sodium hydroxide aqueous solution as in 1.1 and mix them in the same container at a molar ratio of 1:3, and then mechanically stir at 1000r / min for 10min. Place in a 100W ultrasonic container and vibrate for 10 minutes;

[0042] 1.3 Mix the above 1.1 and 1.2 liquid with precipitation in the same container, mechanically stir at 1000r / min for 10 minutes, then place in a 100W ultrasonic container for 10 minutes, filter after shaking, wash the precipitate with distilled...

Embodiment 2

[0071] Step 1: Synthesis of Yttrium Silicate Ultrafine Powder

[0072] 1. Y 4 Si 3 o 12 Synthesis of Ultrafine Powder

[0073] 1.1 According to the molar ratio of Y:Si=2:3, mix 1.25mol / L yttrium nitrate aqueous solution and 1.87mol / L sodium silicate aqueous solution in the same container; mechanically stir at 2000r / min for 30min and place in a 500W Oscillate in an ultrasonic container for 60 minutes;

[0074] 1.2 Take the same amount of 1.25mol / L yttrium nitrate aqueous solution and 3.75mol / L sodium hydroxide aqueous solution as in 1.1 and mix them in the same container at a molar ratio of 1:3, and then mechanically stir at 2000r / min for 30min. Place in a 500W ultrasonic container and vibrate for 60 minutes;

[0075] 1.3 Mix the above 1.1 and 1.2 liquid with precipitation in the same container, mechanically stir at 2000r / min for 90 minutes, then place in a 500W ultrasonic container for 60 minutes, filter after shaking, wash the precipitate with distilled water for 5 times...

Embodiment 3

[0104] Step 1: Synthesis of Yttrium Silicate Ultrafine Powder

[0105] 1. Y 4 Si 3 o 12 Synthesis of Ultrafine Powder

[0106] 1.1 According to the molar ratio of Y:Si=2:3, mix 1.25mol / L yttrium nitrate aqueous solution and 1.87mol / L sodium silicate aqueous solution in the same container; mechanically stir at 1500r / min for 20min and place in a 300W Oscillate in an ultrasonic container for 40 minutes;

[0107] 1.2 Take the same amount of 1.25 mol / L yttrium nitrate aqueous solution and 3.75 mol / L sodium hydroxide aqueous solution as in 1.1 and mix them in the same container at a molar ratio of 1:3, and stir mechanically at 1500r / min for 20min. Place in a 300W ultrasonic container and vibrate for 40 minutes;

[0108] 1.3 Mix the above 1.1 and 1.2 liquid with precipitation in the same container, mechanically stir at 1500r / min for 50 minutes, then place in a 300W ultrasonic container for 30 minutes, filter after shaking, wash the precipitate with distilled water for 4 times P...

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Abstract

This invention relates to a kind of water-thermo electrophoresis deposition process which use gradient silicic acid yttrium smear layer. This process applies wet chemistry method to synthesize gradient component and three kinds of expected crystal phase structure silicic acid yttrium micropower, then dispersing them in liquid medium, applying water-thermo electrophoresis deposition process in low temperature to gain satisfactory gradient silicic acid yttrium smear layer, solving the problem of heat injury of basis body in the process. The feature is: cohering strength of smear layer and basis body exceed 28MPa; excellent antioxygen performance; valid protection to carbon material at 1600 DEG C can last 260hours; oxidizing weight loss is below 2%.

Description

technical field [0001] The invention relates to a preparation method of yttrium silicate coating, in particular to a hydrothermal electrophoretic deposition method of gradient yttrium silicate coating. Background technique [0002] Yttrium silicate material has excellent physical and chemical properties such as high melting point, low Young's modulus, low thermal expansion coefficient, low high temperature volatilization rate, low high temperature oxygen permeability and chemical corrosion resistance, making it a graphite, C / C and C / C -One of the ideal materials for high-temperature oxidation-resistant coatings of high-performance materials such as SiC composite materials and SiC structural ceramics. The in-depth study of yttrium silicate high-temperature anti-oxidation coating materials provides the premise and guarantee for the wider application of structural materials in many fields such as aerospace, military and civil. [0003] The preparation techniques of yttrium sil...

Claims

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Application Information

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IPC IPC(8): C25D13/02
Inventor 黄剑锋邓飞曹丽云李贺军
Owner SHAANXI UNIV OF SCI & TECH
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