Preparation method for ZrB2-SiO2 composite high-temperature oxidation resistant coating

A high-temperature anti-oxidation and coating technology, which is applied in the preparation of ZrB2–SiO2 composite high-temperature anti-oxidation coatings and the preparation of high-temperature anti-oxidation coatings on the surface of materials, can solve the problem of poor bonding ability between coatings and base materials and long preparation cycles , high sintering temperature and other problems, to achieve the effect of improving anti-oxidation performance, short preparation cycle and good combination

Active Publication Date: 2014-11-19
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, the method described in this patent exists in the ZrB prepared 2 Problems such as poor bonding ability between the coating and the base material, high sintering temperature, long preparation cycle, and high cost

Method used

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  • Preparation method for ZrB2-SiO2 composite high-temperature oxidation resistant coating
  • Preparation method for ZrB2-SiO2 composite high-temperature oxidation resistant coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] a ZrB 2 – SiO 2 A method for preparing a composite high-temperature anti-oxidation coating, comprising the following steps:

[0027] 1) Use commercially available chemically pure ZrB 2 The powder is subjected to dry ball milling for 6 hours to obtain a powder with an average particle size of 4-5 μm, which is set aside. Select commercially available elemental iodine (purity ≥ 99.7%) and isopropanol (purity ≥ 99.8%) as raw materials.

[0028] 2) Weigh ZrB 2 Powder 1g, pour it into a Erlenmeyer flask, add 45mL isopropanol and stir on a magnetic stirrer for 2h to obtain ZrB 2 Suspension, then add 0.3g of iodine to the suspension, and then put it on a magnetic stirrer and stir for 1h to obtain Suspension A.

[0029] 3) Pour the suspension A into the hydrothermal kettle with a filling degree of 60%; place the SiC–C / C sample on the cathode clamp in the hydrothermal kettle with graphite as the anode, and seal the hydrothermal kettle; The cathode and anode of the hydrother...

Embodiment 2

[0033] a ZrB 2 – SiO 2 A method for preparing a composite high-temperature anti-oxidation coating, comprising the following steps:

[0034] 1) Use commercially available chemically pure ZrB 2 The powder is subjected to dry ball milling for 8 hours to obtain a powder with an average particle size of 3.5-4.5 μm, which is set aside. Select commercially available elemental iodine (purity ≥ 99.7%) and isopropanol (purity ≥ 99.8%) as raw materials.

[0035] 2) Weigh ZrB 2 Powder 2g, pour it into a Erlenmeyer flask, add 300mL isopropanol and stir on a magnetic stirrer for 3h to obtain ZrB 2 Suspension, then add 1g of iodine to the suspension, and then stir on a magnetic stirrer for 2h to obtain suspension A.

[0036] 3) Pour the suspension A into the hydrothermal kettle with a filling degree of 60%; place the SiC–C / C sample on the cathode clamp in the hydrothermal kettle with graphite as the anode, and seal the hydrothermal kettle; The cathode and anode of the hydrothermal kett...

Embodiment 3

[0040] a ZrB 2 – SiO 2 A method for preparing a composite high-temperature anti-oxidation coating, comprising the following steps:

[0041] 1) Use commercially available chemically pure ZrB 2 The powder is subjected to dry ball milling for 10 hours to obtain a powder with an average particle size of 2.5-3.5 μm, which is set aside. Select commercially available elemental iodine (purity ≥ 99.7%) and isopropanol (purity ≥ 99.8%) as raw materials.

[0042] 2) Weigh ZrB 2 Pour 3g of powder into a conical flask, add 190mL of isopropanol and stir on a magnetic stirrer for 4h to obtain ZrB 2 Suspension, then add 2g of iodine to the suspension, and then put it on a magnetic stirrer and stir for 3h to obtain Suspension A.

[0043] 3) Pour the suspension A into the hydrothermal kettle with a filling degree of 60%; place the SiC–C / C sample on the cathode clamp in the hydrothermal kettle with graphite as the anode, and seal the hydrothermal kettle; The cathode and anode of the hydrot...

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Abstract

The invention discloses a ZrB2-SiO2 composite high-temperature oxidation resistant coating, and belongs to the technical field of a ceramic coating. The adopted technical scheme is that ZrB2 powder is added into isopropanol, an iodine is added, and a suspension liquid is obtained through uniformly stirring; the suspension liquid is poured into a hydrothermal kettle, a SiC-C / C sample is placed on a cathode clamp in the hydrothermal kettle to be subjected to the pulsed arc discharge deposition, and a ZrB2 porous skeleton layer is prepared on the surface of the SiC-C / C sample; the SiC-C / C sample with the ZrB2 porous skeleton layer is infiltrated in a silica sol solution and is placed in a drying oven to be dried, so that the ZrB2-SiO2 composite high-temperature oxidation resistant coating is prepared on the surface of the SiC-C / C sample. The preparation method has the advantages that the cost is low, the operation is simple, the preparation cycle is short; in addition, the ZrB2-SiO2 composite coating prepared by the invention has good thermal shock resistance, is compact, can be well bonded with a base body, and is not needed to be sintered.

Description

technical field [0001] The invention belongs to the technical field of preparation of ceramic coatings, and relates to a preparation method of a high-temperature anti-oxidation coating on the surface of a material, in particular to a ZrB 2 – SiO 2 A method for preparing a composite high-temperature anti-oxidation coating. Background technique [0002] Zirconium diboride (ZrB 2 ) has the characteristics of high melting point, high hardness, excellent thermal conductivity and electrical conductivity, good thermal shock resistance, etc., and has been successfully used as a high-temperature oxidation-resistant ablation coating on the surface of carbon / carbon composite materials. Studies have shown that single-phase ZrB 2 A protective film will be formed in a high-temperature oxidizing environment, and the liquid B formed at 1100°C 2 o 3 Glass has played a good anti-oxidation effect. However, above 1200°C, B 2 o 3 Rapid evaporation, gaseous substances in the product (B 2...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B41/85
Inventor 李翠艳欧阳海波黄剑锋曹丽云费杰孔新刚卢靖
Owner SHAANXI UNIV OF SCI & TECH
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