Preparation method of high-temperature-resistant coating for ceramic-based composite material

A composite material and ceramic-based technology, applied in the field of preparation of high-temperature resistant coatings for ceramic-based composite materials, can solve problems such as poor high temperature resistance and oxidation resistance, achieve excellent high temperature resistance, improve ceramic productivity, and simple molding tools Effect

Inactive Publication Date: 2020-09-29
HUNAN UNIV OF HUMANITIES SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The purpose of the present invention is to provide a method for preparing a high-temperature resistant coating for ceramic matrix composites, to prepare ultra-high temperature ceramic coatings on the surface of ceramic matrix composites through a low-temperature and rapid process, so that ceramic matrix composites can overcome high-temperature resistance and oxidation resistance. Poor performance and other disadvantages

Method used

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  • Preparation method of high-temperature-resistant coating for ceramic-based composite material
  • Preparation method of high-temperature-resistant coating for ceramic-based composite material
  • Preparation method of high-temperature-resistant coating for ceramic-based composite material

Examples

Experimental program
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Effect test

Embodiment 1

[0047] A molding tool, the structure of which is as figure 2 As shown, including upper and lower templates with matching dimensions; as figure 2 As shown in (a), the lower formwork is a plate with a groove in the center, and the upper formwork is a plate with a protrusion in the center. The height of the protrusion is smaller than the depth of the groove to place the prefabricated parts to be compressed; the edges of the upper template and the lower template are respectively provided with corresponding connection holes, such as figure 2 As shown in (b), the upper formwork and the lower formwork are connected and pressed by bolts through connecting holes.

[0048] Preferably, the material of the upper template and the lower template is stainless steel, and the thickness of the upper template and the lower template are each 20 mm; the material of the bolts is high temperature resistant stainless steel.

[0049] The design of the molding tool in this embodiment can well cont...

Embodiment 2

[0051] A kind of ceramic matrix composite material uses ZrO 2 -SiO 2 The preparation method of the coating, the technological process is shown as figure 1 shown, including the following steps:

[0052] S1: Weigh silica sol and ZrO according to mass ratio 2 powder, adding tetraethyl orthosilicate and N,N-dimethylformamide, among them, ZrO 2 Powder size is 200 mesh, silica sol and ZrO 2 The mass ratio of powder is 1:5, and the mass ratio of silicone resin, tetraethylorthosilicate and N,N-dimethylformyl is 1:0.1:0.1; magnetically stir at room temperature to form silica sol containing ceramic powder Suspension, wherein the rate of magnetic stirring is 1000rpm, and the time is 2h;

[0053] S2: Use SiC sandpaper on C f / The surface of the SiC composite material substrate is polished to remove residual grease and other pollutants on the surface of the substrate, and then ultrasonically cleaned with deionized water for 30 minutes and placed in a 70°C oven to dry for use;

[005...

Embodiment 4

[0071] A kind of ZrC-SiO for ceramic matrix composite material 2 The preparation method of the coating, the technological process is shown as figure 1 shown, including the following steps:

[0072] S1: Take silica sol and ZrC powder by mass ratio, add tetraethyl orthosilicate and N,N-dimethylformamide, wherein, ZrC powder size is 150 orders, the mass ratio of silica sol and ZrC powder is 1: 1. The mass ratio of silicone resin, tetraethyl orthosilicate to N,N-dimethylformyl is 1:0.2:0.2; stir magnetically at room temperature, the stirring rate is 1500rpm, and the time is 1h to form ceramic powder silica sol suspension.

[0073] S2: Use SiC sandpaper on C f / SiOC composite substrate surface is polished to remove residual grease and other pollutants on the substrate surface, and then ultrasonically cleaned with deionized water for 30 minutes and placed in an oven at 80°C for drying before use;

[0074] S3: C that will pass through S2 under vacuum f / SiOC composite material i...

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Abstract

The invention belongs to the technical field of coating materials, and provides a preparation method of a high-temperature-resistant coating for a ceramic-based composite material. According to the invention, tetraethoxysilane and N,N-dimethylformamide are respectively used as an anti-gelling agent and a dispersing agent, and the coating is obtained on the surface of the ceramic-based composite material by adopting a process consisting of dipping, mould pressing low-temperature gelatinization and high-temperature cracking. The preparation method is short in preparation period and low in cost;the temperature of mold pressing low-temperature gelatinization and high-temperature cracking is lower than 1000 DEG C, so influence on the ceramic-based composite material is small; the strength retention rate of the material obtained after the obtained coating is oxidized at 1500 DEG C for 1 h is larger than or equal to 60%, so good high-temperature resistance is achieved; the coating is good inconsistency, has high binding force (larger than or equal to 10 MPa) with a matrix, presents good compactness and integrity and can be applied to the field of aerospace.

Description

technical field [0001] The invention relates to the technical field of coating materials, in particular to a method for preparing a high-temperature-resistant coating for ceramic matrix composite materials. Background technique [0002] In recent years, with the rapid development of the aerospace industry, the beautiful dream of human beings to explore outer space is becoming a reality step by step. Among the many sciences and technologies supporting the development of aerospace technology, the material system is an important foundation. All industrialized countries in the world are concentrating on finding materials that can replace metals and metal alloys that can no longer meet the new requirements. [0003] Ceramic materials are favored by material workers for their outstanding high temperature resistance, but they have fatal problems of high brittleness in practical use as structural materials, including low fracture toughness, small fracture strain, poor resistance to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B41/87C04B35/80C04B35/48C04B35/56C04B35/58B29C51/30B29C51/42B29C51/46
CPCC04B41/5042C04B41/87C04B41/009C04B35/48C04B41/507C04B41/5059C04B35/80C04B35/58078C04B35/5622B29C51/30B29C51/42B29C51/46C04B35/806C04B41/4554C04B41/5035
Inventor 文瑾罗飞田修营钟洪彬严之颢陈兵易璐
Owner HUNAN UNIV OF HUMANITIES SCI & TECH
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