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Preparation of corundum-mullite multiple phase ceramic coating

A technology of composite ceramics and mullite, which is applied in the direction of coating, metal material coating process, gaseous chemical plating, etc., can solve the problems of weak bonding strength between mullite coating and SiC matrix, high preparation temperature and hydrolysis rate. Quick and other problems, to achieve the effect of superior erosion resistance, high bonding strength

Inactive Publication Date: 2006-05-24
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the high preparation temperature, AlCl 3 、SiCl 4 The hydrolysis rate is fast and gas phase nucleation is easy to occur, so the bonding strength between the prepared mullite coating and the SiC substrate is weak

Method used

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  • Preparation of corundum-mullite multiple phase ceramic coating
  • Preparation of corundum-mullite multiple phase ceramic coating
  • Preparation of corundum-mullite multiple phase ceramic coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0011] specific implementation plan

[0012] The corundum-bonded mullite coating was prepared by chemical vapor deposition on graphite paper, and the process parameters were:

[0013] AlCl 3 Temperature: 130°C

[0014] AlCl 3 Carrier gas flow (H 2 ): 200ml / min

[0015] SiCl 4 Carrier gas flow (H 2 ): Adjust according to Table 1 as the room temperature changes

[0016] AlCl 3 Flow / SiCl 4 Flow: 2 / 1

[0017] CO 2 Flow: 75ml / min

[0018] Diluent H 2 Flow rate: 200~400ml / min

[0019] Deposition temperature: 550°C

[0020] Deposition time: 30 hours

[0021] room temperature

/ °C

SiCl 4 / (kpa)

Saturated vapor pressure

AlCl 3 / SiCl 4 = 2 / 1 *

AlCl 3 / SiCl 4 = 3 / 1

AlCl 3 / SiCl 4 = 4 / 1

AlCl 3 / SiCl 4 =5 / 1

20

26.0848

7.417424

4.944949

3.708712

2.96697

21

27.2724

7.118639

4.745759

3.55932

2.847456

22

28.4992

...

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Abstract

The invention discloses a method for preparing a corundum-mullite composite ceramic coating by chemical vapor deposition combined with post-treatment, which is characterized in that the temperature of the chemical vapor deposition process is 450-650°C, and the gas phase system is AlCl 3 -SiCl 4 -H 2 -CO 2 , the post-treatment condition is 1250°C for 2 hours. Corundum content in corundum-mullite composite ceramics by AlCl 3 Flow / SiCl 4 flow control. h 2 Flow / CO 2 The flow ratio can be adjusted to 5 / 1 or 2 / 1, H 2 Flow / CO 2 When the flow ratio is 5 / 1, the microstructure of the composite oxide coating is columnar, H 2 Flow / CO 2 When the flow ratio is 2 / 1, the microstructure of the composite oxide coating is equiaxed. The composite oxide coating prepared by the present invention has high bonding strength with the matrix and has excellent erosion resistance; the composite oxide coating is converted into corundum (α-Al 2 o 3 )-mullite composite coating. Through X-ray diffraction semi-quantitative analysis, in the corundum-mullite composite ceramics prepared by the method, the corundum content is 32wt%, and the mullite content is 68wt%.

Description

technical field [0001] The invention relates to a method for manufacturing a corundum-mullite composite ceramic coating material by chemical vapor deposition (Chemical Vapor Deposition, CVD for short), which is suitable for preparing carbon fiber toughened carbon-based composite materials, carbon fiber or silicon carbide fiber reinforced The anti-oxidation coating of non-oxide ceramic matrix composite materials such as tough silicon carbide is also suitable for the preparation of wear-resistant and heat-insulating coatings such as metal knives. Background technique [0002] Mullite or corundum-mullite composite ceramics are considered to be ideal high-temperature anti-oxidation and anti-scour coating materials for non-oxide composite materials such as C / C and C / SiC. They are generally prepared by sol-gel method, but sol -The coating prepared by the gel method has more pores, and the bonding strength with the composite material is low, and it is easy to fall off. [0003] In...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C16/40
Inventor 陈照峰张立同成来飞徐永东
Owner NORTHWESTERN POLYTECHNICAL UNIV