High-temperature-resistant environmental barrier coating and preparation method thereof

An environmental barrier coating and high temperature resistant technology, which can be used in coatings, metal material coating processes, melt spraying, etc. less, low thermal expansion coefficient, good high temperature stability

Active Publication Date: 2019-03-15
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantages of these EBC systems are: (1) The material of the bonding layer is Si, and its melting point is about 1410°C, so the l

Method used

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  • High-temperature-resistant environmental barrier coating and preparation method thereof
  • High-temperature-resistant environmental barrier coating and preparation method thereof
  • High-temperature-resistant environmental barrier coating and preparation method thereof

Examples

Experimental program
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Effect test

preparation example Construction

[0045] Preparation of the middle layer. By plasma spraying method, the Yb 2 Si 2 o 7 The powder is sprayed onto a substrate with a SiC bond coat. Wherein, the thickness of the intermediate layer in the high-temperature-resistant environment barrier coating may be 5-200 μm, preferably 30-200 μm. The parameters of the plasma spraying process include: plasma gas Ar: 35-55 slpm; powder carrier gas Ar: 2-7 slpm; plasma gas H 2 : 5~15slpm; Spraying distance: 90~200mm; Spraying power: 30~50kw; Powder feeding rate: 10~35r / min.

[0046] Preparation of toppings. Rare earth monosilicate ((Re 2 SiO 5 , for example: Y 2 SiO 5 、Sc 2 SiO 5 、Gd 2 SiO 5 、Er 2 SiO 5 、Tm 2 SiO 5 , Yb 2 SiO 5 、Lu 2 SiO 5 At least one of the) powder spraying on the surface with SiC bonding layer and Yb 2 Si 2 o 7 On the substrate of the intermediate layer, the high temperature resistant environment barrier coating is prepared. Wherein the surface layer in the environmental barrier coating ...

Embodiment 1

[0050] Preparation of SiC / Yb on C / SiC Composite Matrix 2 Si 2 o 7 / Yb 2 SiO 5 Coating, the coating is composed of 3 layers, from the inner layer to the outer layer, its composition is: bonding layer: SiC; middle layer: Yb 2 Si 2 o 7 ; Surface layer: Yb 2 SiO 5 .

[0051] The steps of coating preparation are as follows:

[0052] Step 1: Sandblasting the surface of the C / SiC composite material substrate with a sandblasting pressure of 0.3MPa;

[0053] Step 2: Prepare a Si coating on the surface pretreated C / SiC composite material substrate by plasma spraying method; the spraying process parameters are shown in Table 1, and the thickness of the silicon coating is 150 μm;

[0054] Table 1 is the process parameters of plasma spraying Si coating

[0055] Plasma gas Ar

34 slpm

Powder carrier gas Ar

4slpm

Plasma gas H2

10slpm

Spray distance

130mm

Spraying power

37kw

Powder feeding rate

20rpm

[0056] *slpm: st...

Embodiment 2

[0067] The difference between this embodiment and the coating described in Embodiment 1 is that the base material used is a C / C composite material, and the rest are the same as in Embodiment 1. The resulting high-temperature-resistant environment barrier coating is shown in the physical picture Figure 7 Shown in (a).

[0068] After 10 and 20 thermal shock experiments (T=1500°C), the coating remained intact, and no peeling occurred on the surface of the sample ( Figure 7 (b) and (c)). It shows that the coating structure prepared in this example maintains good high temperature stability and thermal shock resistance in an environment of 1500°C.

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Abstract

The invention relates to a high-temperature-resistant environmental barrier coating and a preparation method thereof. The high-temperature-resistant environmental barrier coating sequentially comprises a substrate, and a bonding layer and a surface layer which are positioned on the surface of the substrate, as well as an intermediate layer which is positioned between the bonding layer and the surface layer, wherein the bonding layer is SiC, the intermediate layer is Yb2Si2O7, and the surface layer is rare earth monosilicate Re2SiO5. Compared with an existing environmental barrier coating taking Si as a bonding layer, the coating provided by the invention has the advantages that SiC has a higher melting point (SiC: 2700 DEG C, Si: 1410 DEG C), thus ensuring that the environmental barrier coating has a higher environmental applicable temperature; and meanwhile, compared with Si, SiC has better oxidation resistance and corrosion resistance.

Description

technical field [0001] The invention relates to a high-temperature-resistant environmental barrier coating and a preparation method thereof, belonging to the field of high-temperature coatings. Background technique [0002] Fiber-reinforced composites, including C / C, C / SiC, etc., are considered ideal candidates for high thrust-to-weight ratio aeroengine hot-end components due to their low density, good high-temperature mechanical properties, and high reliability. However, in the aerobic environment of the aero-engine combustion chamber, the surface stability of the composite material will deteriorate sharply, and the material performance will decrease, which restricts the application of the material in the high-temperature environment. The use of environmental barrier coating (Environmental Barrier Coating, EBC) to protect composite materials, thereby reducing the corrosion of composite materials by corrosive media in the service environment of aeroengines, has become the co...

Claims

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Application Information

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IPC IPC(8): C23C4/134C23C4/11C23C4/04C23C4/18
CPCC23C4/04C23C4/18C23C4/11C23C4/134
Inventor 牛亚然钟鑫周海军李红董绍明郑学斌孙晋良丁传贤
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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