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A kind of ultra-high temperature sealing coating material, coating and preparation method thereof

A sealing coating, ultra-high temperature technology, applied in coating, metal material coating process, welding equipment, etc., to achieve good matching, improve efficiency and service performance.

Active Publication Date: 2020-04-14
BEIJING MINING & METALLURGICAL TECH GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are no public reports of high-temperature sealing coating materials with a service temperature of 1350 °C at home and abroad

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Add 2kg of BN powder with particle size into the mixing equipment, stir at a speed of 15r / min for 10-15min, and add 60-100g of binder at the same time. The binder is a mixture of polyvinyl alcohol and water, and the mixing ratio is 1:5; after the binder and BN powder are fully wetted, first add 5kg of SiC powder with a particle size of less than 50μm, and stir evenly at a speed of 8-15r / min 20-30min; after stirring into granules, add 60-100g of binder and stir evenly at a speed of 8-15r / min for 10-20min to fully wet the binder and the material, then add 500g of Si powder with a particle size of less than 50μm, Stir evenly at a speed of 8-15r / min for 20-30min, stop the machine and discharge, and dry at room temperature for 12-24h.

Embodiment 2

[0030] Add 5kg of SiC powder with a particle size of 25-48μm into the stirring equipment, stir at a speed of 12r / min for 20-30min, and add 30-60g of binder at the same time. The binder is a mixture of polyvinyl alcohol and water, and the mixing ratio is 1:5; after the binder and BN powder are fully wetted, first add 500g of Si powder with a particle size of less than 10μm, and stir evenly at a speed of 8-15r / min 20 to 30 minutes; after stirring into granules, add 60 to 100g of binder and stir evenly at a speed of 8 to 15r / min for 10 to 20 minutes to fully wet the binder and the material, then add 2kg of BN powder, and then add 8 Stir evenly at a speed of ~15r / min for 20~30min, stop the machine and discharge, and dry at room temperature for 12~24h.

Embodiment 3

[0032] Dry the final powder material prepared in Example 1 at 80° C. for 1 hour for use. Use 165-mesh diamond sandpaper to roughen the CMC substrate. After cleaning and drying with a solvent, install it on the spraying tool and place it in the low-pressure plasma spraying cabin. The spray cabin is evacuated to 30mbar and backfilled with argon to 50mbar to reach the spray state. Spray according to the following parameters: power 130kw, current 800A, argon flow 100lpm, hydrogen flow 30lpm, helium flow 20lpm, spraying distance 450mm, powder feeding rate 30g / min, coating thickness 1.5-2.0mm. After the temperature of the substrate drops below 300°C, it is backfilled with argon and cooled to below 100°C, and the workpiece coated with the ultra-high temperature sealing coating is taken out.

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Abstract

The invention provides an ultra-high-temperature sealing coating powder material capable of being used at a temperature of 1200 DEG C and above, a coating and a preparation method thereof, and belongsto the technical field of thermal spraying. The material is composed of the three main components of SiC, Si and BN; the raw materials in the form of a powder separately are prepared into composite powder with different granular structures through a plurality of agglomeration processes; the sealing coating is prepared through thermal spraying, pressing sintering-brazing and other processes; the highest use temperature can reach 1350 DEG C, and is increased by more than 150 DEG C compared with the use temperature of the existing high-temperature sealing coating; and the coating is high in matching performance with CMC and other ceramic matrix composite materials, capable of adequately exerting the advantage of high-temperature resistance of the ceramic matrix composite materials, and widein application in a new generation of aero-engines and gas turbines.

Description

technical field [0001] The invention belongs to the technical field of thermal spraying, relates to the technical field of sealing coating material and its preparation, and aims to provide an ultra-high temperature sealing coating material with a service temperature up to 1350°C and suitable for ultra-high temperature ceramic-based composite material substrates such as CMC , coating and preparation method thereof. Background technique [0002] CMC ceramic matrix composite material has the advantages of light weight, high strength and good high temperature resistance, and has broad application prospects in the hot end parts of gas turbines, and its service temperature can reach 1500 °C. However, turbine components made of CMC are prone to scratches, scratches and material adhesion under high-temperature and high-speed conditions, and then the material performance drops sharply, so a sealing coating is required to protect the CMC substrate. At present, the highest application...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C4/10C23C4/129C23C4/134B23K31/02B23K37/00
CPCB23K31/02B23K37/00C23C4/10C23C4/129C23C4/134
Inventor 于月光刘建明章德铭程旭莹刘通黄凌峰孙建刚梅雪珍
Owner BEIJING MINING & METALLURGICAL TECH GRP CO LTD
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