RU2189368C2 - High-temperature coating - Google Patents

High-temperature coating Download PDF

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Publication number
RU2189368C2
RU2189368C2 RU2000130626A RU2000130626A RU2189368C2 RU 2189368 C2 RU2189368 C2 RU 2189368C2 RU 2000130626 A RU2000130626 A RU 2000130626A RU 2000130626 A RU2000130626 A RU 2000130626A RU 2189368 C2 RU2189368 C2 RU 2189368C2
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RU
Russia
Prior art keywords
temperature
coating
silicon
temperature coating
boron
Prior art date
Application number
RU2000130626A
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Russian (ru)
Inventor
С.С. Солнцев
Н.В. Исаева
Г.В. Ермакова
Original Assignee
Государственное предприятие "Всероссийский научно-исследовательский институт авиационных материалов"
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Priority to RU2000130626A priority Critical patent/RU2189368C2/en
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    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B41/00After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
    • C04B41/009After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone characterised by the material treated
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B41/00After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
    • C04B41/45Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements
    • C04B41/50Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with inorganic materials
    • C04B41/5025Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with inorganic materials with ceramic materials
    • C04B41/5042Zirconium oxides or zirconates; Hafnium oxides or hafnates
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/00474Uses not provided for elsewhere in C04B2111/00
    • C04B2111/00982Uses not provided for elsewhere in C04B2111/00 as construction elements for space vehicles or aeroplanes

Abstract

FIELD: aircraft industry. SUBSTANCE: high- temperature coating contains, wt.%: silicon, 6-9; boron, 2-5; haffnium oxide, 63- 68; haffnium boride, 8-12; tantalum pentoxide, 12-17. Invention can be applied for oxidation protection of silicon carbide matrix-based nonmetallic materials with carbon fiber filler. EFFECT: increased antioxidant activity of carbon ceramic composites at temperature 1800 C. 2 tbl

Description

 The invention relates to the aviation industry and can be used to protect against oxidation of non-metallic materials based on a silicon carbide matrix and a carbon fiber filler.

Known high-temperature coating of the following composition, wt.%:
Silicon - 5-40
Silicon Carbide - 50-70
Boron - 1-15 [1]
A disadvantage of the known coating is the low antioxidant effect at temperatures above 1300 o C.

The closest analogue, taken as a prototype, is a high-temperature coating composition, wt.%:
Molybdenum Disilicide - 63-75
Silicon - 10-25
Chrome - 5-10
Boron - 3-5 [2]
The disadvantage of the coating of the prototype is the low angio-oxidative effect at temperatures above 1350 o C.

An object of the invention is to increase the antioxidant effect of carbon-ceramic composite materials at a temperature of 1800 o C.

The stated technical problem is achieved by the fact that the proposed high-temperature coating containing silicon and boron, which additionally contains hafnium oxide, hafnium boride and tantalum pentoxide in the following ratio of components. wt.%:
Silicon - 6-9
Boron - 2-5
Hafnium oxide - 63-68
Borid hafnium - 8-12
Tantalum Pentoxide - 12-17
The combined introduction of hafnium oxide, hafnium boride and tantalum pentoxide in the proposed high-temperature coating allows to increase its antioxidant effect at a temperature of 1800 o C in connection with the formation of solid solutions of the introduction of variable composition in the system HfO 2 - HfSiO 4 - Ta 2 O 5 .

An analysis of the patent and technical literature showed that the formation of solid solutions in the HfO 2 - HfSiO 4 - Ta 2 O 5 system and their use to increase the antioxidant effect of protective coatings at high temperatures is not currently known.

Examples of implementation
To obtain coatings were prepared 4 compositions, the ratio of components in which are given in table. 1.

 The coating components in the form of powders of the corresponding chemical compounds were placed in a china drum with alundum balls. The mixture was loaded in the indicated ratios by no more than 3/4 of the volume of the drum in which it was mixed for 48 hours.

A high-temperature coating on the samples of the carbon-ceramic composite material was applied by spraying. The samples were dried in an oven at a temperature of 80 o C. The coating was formed in a furnace with silicone heaters at a temperature of 1350-1370 o С for 20-30 minutes.

Samples of carbon-ceramic material with protective coatings were tested for heat resistance at a temperature of 1800 o C for 10 cycles of 10 min each according to 1800 <--> 20 o C. . The research results are presented in table. 2.

As can be seen from the table. 2, the antioxidant effect of the proposed coating on samples of carbon-ceramic composite material when used is significantly increased, the prototype coating is destroyed at a temperature of 1400 o C.

 Detected microcracks on the surface and ends and a slight decrease in the mass of the samples (less than 1 wt.%) Confirm the appearance of an internal effect of self-healing of the proposed protective coating compositions, which prevents the diffusion of air oxygen deep into the sample.

The application of the proposed high-temperature coating will ensure the performance of nodes and parts made of carbon-ceramic composite materials and increase the reliability and resource of aircraft products by 1.5-2 times,
The proposed high-temperature coating is environmentally friendly, fire and explosion safe.

Literature
1. US patent 453930, CL 501-88, publ. 12/28/82

 2. A.c. CCCP 464568.

Claims (1)

  1. High-temperature coating containing silicon and boron, characterized in that it further comprises hafnium oxide, hafnium boride and tantalum pentoxide in the following ratio of components, wt. %:
    Silicon - 6-9
    Boron - 2-5
    Hafnium oxide - 63-68
    Borid hafnium - 8-12
    Tantalum Pentoxide - 12-17
RU2000130626A 2000-12-07 2000-12-07 High-temperature coating RU2189368C2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
RU2000130626A RU2189368C2 (en) 2000-12-07 2000-12-07 High-temperature coating

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
RU2000130626A RU2189368C2 (en) 2000-12-07 2000-12-07 High-temperature coating

Publications (1)

Publication Number Publication Date
RU2189368C2 true RU2189368C2 (en) 2002-09-20

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Family Applications (1)

Application Number Title Priority Date Filing Date
RU2000130626A RU2189368C2 (en) 2000-12-07 2000-12-07 High-temperature coating

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RU (1) RU2189368C2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1479659A3 (en) * 2003-05-22 2006-02-08 United Technologies Corporation Bond coating for silicon based substrates such as silicon nitride

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
МОСКОВСКАЯ МЕЖДУНАРОДНАЯ КОНФЕРЕНЦИЯ ПО КОМПОЗИТАМ. ТЕЗИСЫ ДОКЛАДОВ, 4.2, МОСКВА. 1990, c. 153-154. *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1479659A3 (en) * 2003-05-22 2006-02-08 United Technologies Corporation Bond coating for silicon based substrates such as silicon nitride

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