One-step preparation method of multi-layer environmental barrier coatings through spark plasma sintering (SPS)

An environmental barrier coating and discharge plasma technology, which is applied in the field of ion sintering to prepare multi-layer environmental barrier coatings and multi-layer composite environmental barrier coatings. and other problems, to achieve the effect of low heat preservation temperature, short preparation cycle and high density

Inactive Publication Date: 2015-04-22
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, the methods for preparing multilayer environmental barrier coatings include plasma spraying, chemical vapor deposition (CVD), electron beam physical vapor deposition (PVD), sol-gel method, slurry method, sintering method, etc., plasma spraying method The obtained multilayer environmental barrier coating has low density and porosity, and because the spraying temperature is too high, there will be a melting zone on the surface of the coating, and the cost is very high. The vapor deposition method has a lo

Method used

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  • One-step preparation method of multi-layer environmental barrier coatings through spark plasma sintering (SPS)
  • One-step preparation method of multi-layer environmental barrier coatings through spark plasma sintering (SPS)
  • One-step preparation method of multi-layer environmental barrier coatings through spark plasma sintering (SPS)

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Embodiment 1 steps are as follows:

[0020] Step 1: Weigh 0.52g of Si powder, press it into tablets with a tablet machine, and weigh 3Al 2 o 3 -2SiO2 2 Powder mass is 0.42g, pressed into tablets, weighed Yb 2 SiO 5 Powder 0.31g, compressed into tablets.

[0021] Step 2: SiC / SiC, pressed into sheets of Si, 3Al 2 o 3 -2SiO2 2 , Yb 2 SiO 5 , from bottom to top according to SiC / SiC, Si, 3Al 2 o 3 -2SiO2 2 , Yb 2 SiO 5 , put in the order of figure 1 In the membrane cavity shown, turn on the SPS device.

[0022] Step 3: Keep the heating rate in the SPS device at 50°C / min, the pressure at 48MPa, and set the holding temperature at 1050°C.

[0023] Step 4: When the temperature rises to 1050°C, keep it warm for 2 minutes, then cool, and control the cooling rate at 50°C / min.

[0024]Step 5: After cooling to room temperature, take out the sample to get Si——3Al 2 o 3 -2SiO2 2 ——Yb 2 SiO 5 Substrate samples for system environmental barrier coatings.

[0025] ...

Embodiment 2

[0027] The water-oxygen corrosion resistance of the coating prepared in Example 1 was tested in the water-oxygen corrosion device. The conditions of the whole water-oxygen corrosion test were as follows: the temperature in the furnace was 1000°C. The atmosphere is: a mixture of water vapor and oxygen, and the saturated vapor pressure of water vapor is 0.5 atmospheres. The gas flow rate is 150ml / min, which is controlled by a gas flow meter. The pressure is 1 atmosphere. The entire water-oxygen corrosion time is 144 hours. The result is as Figure 4 As shown, it can be seen from the figure that the mass change fluctuation is very large for the substrate sample without the environmental barrier coating within the experimental time, while the substrate sample with the multilayer environmental barrier coating prepared in Example 1 The fluctuation of mass change is very small. When the experiment time reaches about 130 hours, the sample without environmental barrier coating has a...

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Abstract

The invention relates to a one-step preparation method of multi-layer environmental barrier coatings through spark plasma sintering (SPS). The implementation method disclosed by the invention comprises the following steps of directly preparing an environmental barrier coating material on the surface by taking a silicon carbide fibre reinforced silicon carbide ceramic based composite material (SiC/SiC) as a basal body, carrying out SPS at 1050 DEG C according to different surface materials of the coatings, wherein the heat preservation time is set to 2 min; the pressure in a mould is set to 48 MPa; the temperature increasing rate is set to 50 DEG C/min; and putting the sheeted coating material together with the basal body into the mould so as to directly obtain the SiC/SiC composite material having the multi-layer environmental barrier coatings. The multi-layer environmental barrier coatings are prepared on the basal body material by using the method disclosed by the invention; compared with chemical vapour deposition (CVD), a plasma spraying method, a sol-gel method and the like, the method disclosed by the invention is more convenient; the cost is greatly reduced; the preparation period is shortened; furthermore, the quality of the coatings is controllable; and the prepared coatings are higher in density and excellent in property.

Description

Technical field [0001] This article belongs to the field of coating preparation, and specifically relates to a method for preparing a multilayer environmental barrier coating by spark plasma sintering in one step. The required multilayer composite environmental barrier coating can be prepared in one step by spark plasma sintering. Background technique [0002] With the rapid development of the aviation industry, high thrust-to-weight ratio engines have become the focus of aero-engine development. In order to achieve a major breakthrough in high thrust-to-weight ratio and high efficiency of aero-engines, it is necessary to increase the temperature of the gas in the engine and reduce the structural mass, and the increase in gas temperature will correspondingly increase the surface temperature of the hot end parts of the high-pressure turbine. The surface temperature of the hot-end parts of the high-pressure turbine of the high-thrust-to-weight ratio aero-engine will reach abov...

Claims

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Application Information

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IPC IPC(8): C04B35/80C04B35/515C04B35/185C04B35/622
Inventor 宋金融马文金喜龙毛军逵沈凯屠泽灿江华
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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