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Preparation method of high-temperature oxidation resistant thermal barrier coating on Cf/SiC composite surface

A high-temperature anti-oxidation and thermal barrier coating technology, applied in the field of composite materials, can solve the problems of complex process, high temperature resistance of the coating and poor performance of oxygen permeation and diffusion

Inactive Publication Date: 2016-11-16
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the existing f / SiC composite material surface preparation coating process process is complicated, the obtained coating has poor performance of high temperature resistance and oxygen permeation and diffusion, and provides a C f Preparation method of high-temperature oxidation-resistant thermal barrier coating on the surface of / SiC composite material

Method used

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  • Preparation method of high-temperature oxidation resistant thermal barrier coating on Cf/SiC composite surface
  • Preparation method of high-temperature oxidation resistant thermal barrier coating on Cf/SiC composite surface
  • Preparation method of high-temperature oxidation resistant thermal barrier coating on Cf/SiC composite surface

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preparation example Construction

[0030] The present invention provides a C f A preparation method of a high temperature anti-oxidation thermal barrier coating on the surface of a / SiC composite material, the method comprising:

[0031] Step 1: Prepare Re separately 2 Si 2 O 7 Powder and LaMgAl 11 O 19 powder, Re is a rare earth element, selected from one of Y, Er or Yb;

[0032] Step 2: Convert the Re obtained in Step 1 2 Si 2 O 7 Powder and LaMgAl 11 O 19 The powders were mixed with deionized water, ammonium citrate, and gum arabic, respectively, to obtain Re 2 Si 2 O 7 Slurry and LaMgAl 11 O 19 slurry, the Re 2 Si 2 O 7 Slurry and LaMgAl 11 O 19 The slurry was ball milled, screened and granulated, respectively, to obtain Re 2 Si 2 O 7 Spray powder and LaMgAl 11 O 19 spray powder;

[0033] Step 3: Put C f / SiC matrix is ​​pretreated to obtain pretreated C f / SiC matrix;

[0034] Step 4: The coating is prepared by APS technology, and the Re obtained in the above step 2 is 2 Si 2 ...

Embodiment 1

[0046] Take yttrium oxide (Y 2 O 3 ) powder and silicon dioxide (SiO 2 ) powder mix, take La in a molar ratio of 1:11:2 2 O 3 powder, Al 2 O 3 Powder and MgO powder are mixed. Deionized water and zirconia pellets were added to the two mixed powders, followed by rolling ball milling for 8 hours. After ball milling, the pellets were taken out, and the slurry was dried in an oven at 100 °C. The powder obtained after drying was subjected to rapid centrifugal ball milling for 10 minutes. Pass through a 60 μm sieve. The resulting mixed Y 2 O 3 and SiO 2The raw material powder is subjected to solid-phase reaction at a high temperature of 1400 ° C for 6 hours to synthesize high-purity Y 2 Si 2 O 7 Powder; mix the resulting La 2 O 3 , Al 2 O 3 The high-purity LaMgAl was synthesized by solid-phase reaction with MgO raw material powder at a high temperature of 1550 °C for 6 hours. 11 O 19 powder.

[0047] Y prepared above 2 Si 2 O 7 Powder and LaMgAl 11 O 19 The p...

Embodiment 2

[0056] Take erbium oxide (Er 2 O 3 ) powder and silicon dioxide (SiO 2 ) powder mix; take La in a molar ratio of 1:11:2 2 O 3 powder, Al 2 O 3 The powder and MgO powder were mixed; both mixed powders were added with deionized water and zirconia pellets, and then ball milled for 10 hours. Perform rapid centrifugal ball milling for 15 min and pass through a 60 μm sieve. The obtained preparation Er 2 Si 2 O 7 The raw material powder was subjected to solid-phase reaction at a high temperature of 1425 ° C for 6.5 h; the obtained LaMgAl was prepared 11 O 19 The raw material powder was subjected to solid-phase reaction at a high temperature of 1575 °C for 6.5 h.

[0057] The Er obtained above was 2 Si 2 O 7 Powder and LaMgAl 11 O 19 The powders were mixed according to the mass ratio: powder: deionized water: ammonium citrate: gum arabic = 100:110:0.6:1, ball-milled for 50 hours, and then passed through a 120 μm sieve; the sieved slurry was heated at 105 °C Spray gran...

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Abstract

The present invention provides a C f The invention discloses a method for preparing a high-temperature oxidation-resistant thermal barrier coating on the surface of a SiC composite material, belonging to the field of composite materials. resolve existing in C f The process for preparing coatings on the surface of / SiC composite materials is complicated, and the obtained coatings have poor performance in high temperature resistance and oxygen permeation and diffusion resistance. The method is to first synthesize Re by solid-state reaction method. 2 Si 2 o 7 and LaMgAl 11 o 19 Powder, synthetic powder prepared by APS technology after spray granulation in pretreated C f / Sequentially spray Re on the SiC substrate 2 Si 2 o 7 Ceramic layer and LaMgAl 11 o 19 ceramic layer, get C f / SiC composite surface high temperature oxidation resistance thermal barrier coating. The double-ceramic layer thermal barrier coating prepared by the invention has good high-temperature thermal stability, low thermal conductivity, and good sintering resistance, and is suitable for use as a high-temperature thermal protection thermal barrier coating for hot-end components.

Description

technical field [0001] The invention belongs to the field of composite materials, in particular to a C f Preparation method of high temperature oxidation resistant thermal barrier coating on the surface of / SiC composite material. Background technique [0002] Carbon fiber reinforced silicon carbide ceramic matrix composites (C f / SiC) has the advantages of high strength, high hardness, high thermal conductivity and low density, and is one of the most promising candidates for the hot end components of aviation, aerospace, and weaponry. However, C f / SiC is easily oxidized in high temperature oxidizing environment, which greatly limits its application in high temperature oxidizing environment. in C f The preparation of anti-oxidation coating on the surface of / SiC can effectively improve its high-temperature anti-oxidation performance. [0003] Patent CN 101353269A discloses a method for preparing Zr-Si-C high temperature resistant coating on the surface of C / SiC composi...

Claims

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Application Information

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IPC IPC(8): C04B41/89C04B35/16C04B35/44C04B35/622C04B35/626
CPCC04B41/89C04B35/16C04B35/44C04B35/62222C04B35/62695C04B41/009C04B41/52C04B2235/3224C04B2235/3225C04B2235/3227
Inventor 邹兵林王盈蔡晓龙
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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