High-temperature ceramic coating YSZ-RETAO 4 SIC base composite materials and their preparation methods

A technology of high-temperature ceramics and composite materials, applied in the field of composite materials, can solve the problems of limiting the development of silicon carbide in the field of aero-engines and being corroded by the environment, and achieve the effects of reducing thermal mismatch stress, prolonging service life and good matching.

Active Publication Date: 2022-02-01
KUNMING UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, silicon carbide composites are constantly oxidized and corroded by the environment during the long-term service, which limits the further development of silicon carbide in the field of aero-engines

Method used

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  • High-temperature ceramic coating YSZ-RETAO <sub>4</sub> SIC base composite materials and their preparation methods
  • High-temperature ceramic coating YSZ-RETAO <sub>4</sub> SIC base composite materials and their preparation methods
  • High-temperature ceramic coating YSZ-RETAO <sub>4</sub> SIC base composite materials and their preparation methods

Examples

Experimental program
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Effect test

Embodiment 1

[0034] With high temperature ceramic coating YSZ-RETaO 4 The SiC-based composite material, including the SiC matrix, is equipped with a transition layer and a ceramic coating outside the SiC matrix, where the composition of the transition layer includes alumina, aluminum hydroxide, aluminum dihydrogen phosphate and aluminosilicate, and the ceramic coating The composition is YSZ (3 / 6) -(YTaO4) (3 / 6) .

[0035] The concrete preparation method of above-mentioned material comprises the following steps:

[0036] Step 1: Take by weighing 58g aluminum oxide, 158g aluminum hydroxide, 155g aluminum dihydrogen phosphate and 62g calcium oxide, and place them together with absolute ethanol in a ball mill jar to seal and carry out ball milling. The rotating speed of the ball mill is 400r / min, and the ball milling time is After 300 minutes, the various powders were mixed evenly, and then dried at 80°C for 48 hours, and passed through a 300-mesh sieve for later use.

[0037] Step 2: Embed ...

Embodiment 2～7、 comparative example 1～4

[0043] The difference from Example 1 is that the process parameters in the preparation process are different, as shown in Table 1 for details.

[0044] Table 1 is the preparation process parameter table of embodiment 2~7 and comparative example 1~4

[0045]

Embodiment 8

[0047] The difference from Example 1 is that the ceramic coating in this example is YSZ (3 / 6) -(GdTaO4) (3 / 6) , where GdTaO 4 The preparation method of the powder is the same as in Example 1.

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Abstract

The invention relates to the technical field of composite materials, and specifically discloses a high-temperature ceramic coating YSZ-RETaO 4 The SiC-based composite material and its preparation method, weigh aluminum oxide, aluminum hydroxide, aluminum dihydrogen phosphate and calcium oxide, ball mill with absolute ethanol, mix evenly, dry and then sieve; pass the sieved powder SiC The substrate is embedded in an alumina ceramic boat and calcined at a high temperature to form a transition layer on the surface of the SiC substrate; YSZ and RETaO are coated by atmospheric plasma spraying 4 The powder is sprayed onto the surface of the transition layer to form a SiC composite material sprayed with a ceramic coating on the surface. The thermal conductivity of the silicon carbide-based composite material prepared in this patent is 0.67-0.82W·m ‑1 ·K ‑1 Between, to meet the use environment of ultra-high temperature 2200 ~ 2500 ℃.

Description

technical field [0001] The invention relates to the technical field of composite materials, in particular to YSZ-RETaO with high-temperature ceramic coating 4 SiC-based composite material and its preparation method. Background technique [0002] Environmental barrier coating (Environment barrier coating, EBC) can solve the problem of long-term corrosion and oxidation of components in the gas environment, and is currently a hotspot in the research of aero-engine materials. The engine has become the focus of aero-engine development. The core technology of a high thrust-to-weight ratio engine is to increase the temperature at the front inlet of the turbine and reduce the structural mass. However, traditional superalloy materials are not only heavy in mass, but also have limited temperature resistance limits, making it increasingly difficult to meet higher requirements for aeroengines. Silicon carbide ceramic matrix composites not only have low density, but also have excellent...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B41/89C04B35/565
CPCC04B41/009C04B41/89C04B41/52C04B35/565C04B41/5031C04B41/0072C04B41/5042C04B41/5045C04B41/4527
Inventor 冯晶汪俊荣菊杨凯龙陈琳李振军王峰
Owner KUNMING UNIV OF SCI & TECH
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