Carbon/carbon composite material surface mullite whisker-mullite/yttrium alumina silicate compound anti-oxidation coating and preparation method

A mullite whisker and carbon composite material technology, which is applied in the field of anti-oxidation coating preparation, can solve the problems of high porosity and low interface bonding strength, etc.

Inactive Publication Date: 2019-06-28
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the prepared coatings can extend the service life of C / C composites to a certain extent, the coatings prepared by the above method usually have high porosity and low interfacial bonding strength

Method used

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  • Carbon/carbon composite material surface mullite whisker-mullite/yttrium alumina silicate compound anti-oxidation coating and preparation method
  • Carbon/carbon composite material surface mullite whisker-mullite/yttrium alumina silicate compound anti-oxidation coating and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] (1) Press Al 2 (SO 4 ) 3 18H 2 O: Na 2 SO 4 9H 2 O=1:1, take Al 2 (SO 4 ) 3 18H 2 O and Na 2 SO 4 9H 2 0, dry ball milling and mixing for 1h to prepare mixed salt A;

[0035] (2) Clean the SiC-C / C matrix sample ultrasonically, after drying, according to the mass ratio of SiC-C / C matrix sample: mixed salt A=1:10, the SiC-C / C composite material sample The samples were embedded in mixed salt A, and heat-treated in a muffle furnace at a temperature of 950°C for 20 minutes;

[0036] (3) Wash the sample treated in step (2) with boiling water, then dry the sample in an electric blast drying oven at 80°C for 4 hours to obtain a sample with a mullite whisker layer;

[0037] (4) With a concentration of 1wt% polyvinyl alcohol solution as a binder, mix in a ball mill according to the mass ratio of commercially available mullite powder: distilled water: absolute ethanol: polyvinyl alcohol = 4:4:1:1 Uniform, and then use spray granulation method to granulate. During sp...

Embodiment 2

[0045] (1) Press Al 2 (SO 4 ) 3 18H 2 O: Na 2 SO 4 9H 2 O=9:10, take Al 2 (SO 4 ) 3 18H 2 O and Na 2 SO 4 9H 2 O, dry ball milling and mixing for 2h to prepare mixed salt A;

[0046] (2) Clean the SiC-C / C matrix sample ultrasonically, after drying, according to the mass ratio of SiC-C / C matrix sample: mixed salt A=1:15, the SiC-C / C composite material sample The sample was embedded in mixed salt A, and heat-treated in a muffle furnace at a temperature of 900°C for 30 minutes;

[0047] (3) Wash the sample treated in step (2) with boiling water, then dry the sample in an electric blast drying oven at 100°C for 3 hours to obtain a sample with a mullite whisker layer;

[0048] (4) With a concentration of 3wt% polyvinyl alcohol solution as a binder, mix in a ball mill according to the mass ratio of commercially available mullite powder: distilled water: absolute ethanol: polyvinyl alcohol = 4:4:1:1 Uniform, and then use spray granulation method to granulate. During sp...

Embodiment 3

[0056] (1) Press Al 2 (SO 4 ) 3 18H 2 O: Na 2 SO 4 9H 2 O=4:5, take Al 2 (SO 4 ) 3 18H 2 O and Na 2 SO 4 9H 2 O, dry ball milling and mixing for 3h to prepare mixed salt A;

[0057] (2) Clean the SiC-C / C matrix sample ultrasonically, and after drying, according to the mass ratio of SiC-C / C matrix sample: mixed salt A=1:20, the SiC-C / C composite material sample The sample was embedded in mixed salt A, and heat-treated in a muffle furnace at a temperature of 1000°C for 15 minutes;

[0058] (3) Wash the sample treated in step (2) with boiling water, then dry the sample in an electric blast drying oven at 120°C for 2 hours to obtain a sample with a mullite whisker layer;

[0059](4) With a concentration of 2wt% polyvinyl alcohol solution as a binder, mix in a ball mill according to the mass ratio of commercially available mullite powder: distilled water: absolute ethanol: polyvinyl alcohol = 4:4:1:1 Uniform, and then granulated by spray granulation method. During sp...

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Abstract

The invention relates to a carbon / carbon composite material surface mullite whisker-mullite / yttrium alumina silicate compound anti-oxidation coating and a preparation method. According to the preparation method, firstly, an in-situ molten-salt growth method is adopted for preparing a porous mullite whisker layer on the surface of a SiC coating. On one hand, the mullite whisker layer can improve the wettability of SiC and a middle mullite layer; on the other hand, the mullite whisker can improve the inherent brittleness of a mullite ceramic coating. A yttrium alumina silicate glass ceramic coating with good wettability in the presence of the mullite, good inoxidizability and chemical durability at the high temperature is selected for conducting hole sealing treatment on the mullite coatingprepared through supersonic plasma spraying to reduce the porosity of the carbon / carbon composite material surface mullite whisker-mullite / yttrium alumina silicate compound anti-oxidation coating.

Description

technical field [0001] The invention belongs to the technical field of anti-oxidation coating preparation, and relates to a mullite whisker-mullite / yttrium aluminum silicate composite anti-oxidation coating on the surface of a carbon / carbon composite material and a preparation method thereof, in particular to a molten salt method, supersonic plasma spraying method and hot dipping method to prepare mullite whisker-mullite / yttrium aluminum silicate composite anti-oxidation coating. Background technique [0002] With the increasing demand for high-performance composite materials, carbon fiber reinforced composites, especially carbon / carbon (C / C) composites, have excellent high-temperature mechanical properties and stability, low density and low thermal expansion coefficient, these properties in It can still be maintained at high temperatures above 2000°C, and more importantly, its strength does not decrease but rises with the increase of temperature in a high temperature enviro...

Claims

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Application Information

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IPC IPC(8): C04B41/89
Inventor 付前刚周磊李贺军童明德魏亚龙
Owner NORTHWESTERN POLYTECHNICAL UNIV
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