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Aggregation-type composite powder for high-temperature abradable seal coating layer and preparing method of aggregation-type composite powder

A sealing coating and composite powder technology, which is applied in the field of agglomerated composite powder for high-temperature abradable sealing coating and its preparation method, and can solve the problems of poor thermal matching, shedding, and high-temperature oxidation resistance of superalloy substrates Insufficiency and other problems, to achieve the effect of improving the uniformity of tissue performance, increasing the service life, and good thermal matching

Inactive Publication Date: 2014-04-09
BEIJING GENERAL RES INST OF MINING & METALLURGY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the high-temperature sealing coating materials used in gas turbines mainly include NiCrAl / bentonite, NiCrAl / diatomaceous earth, NiCrFeAl / hBN, CoNiCrAlY / hBN, etc. Due to the lack of high-temperature oxidation resistance of such coating materials, the prepared coating The maximum operating temperature of the layer is lower than 850°C, which cannot meet the operating requirements of the high-pressure turbine at around 1000°C
[0004] In addition, the high-temperature abradable sealing coating material for plasma spraying with the publication number CN101659800B is a ceramic sealing coating prepared by using zirconia ceramic powder and polyphenylester. Although the heat-resistant temperature can reach above 1000 ° C, due to the The thermal matching between the coating and the superalloy substrate of the gas turbine is poor, and the thermal fatigue resistance of the coating is insufficient, and it will fall off after a short-term cold and heat cycle, which cannot meet the service life requirements

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Raw material composition: structural component: β-NiAl intermetallic compound; abradable component: polyphenylene; adhesive: polyvinylpyrrolidone.

[0029] Raw material ratio: 5wt% of abradable components, 1wt% of adhesives, and the balance of structural components.

[0030] Preparation method: Mix the structural component and the wearable component by ball milling for more than 12 hours. After the components are evenly mixed, take out the powder for use. The binder is then added while stirring. When stirring, use a "one-shaped" stirring paddle with a length of 30-50 cm, and a flat-bottomed mixing tank with an inner diameter of 40-80 cm. The thickness of the material must not exceed one-third of the height of the inner diameter of the mixing tank. min. The binder is added at one time. Continue to stir the material until the raw material powder is agglomerated into granules. Use a 30-mesh screen to sieve the granulated powder, and put the sieved material back into the...

Embodiment 2

[0032] Raw material composition: structural component: mixture of β-NiAl intermetallic compound and MCrAlY alloy powder, the weight ratio of β-NiAl intermetallic compound and MCrAlY alloy powder is 1:1; abradable component: polyamide and hexagonal boron nitride A mixture of polyamide and hexagonal boron nitride in a weight ratio of 10:1; adhesive: A-B glue.

[0033] Raw material ratio: 10wt% of abradable components, 2wt% of adhesives, and the balance of structural components.

[0034] Preparation method: Mechanically stir and mix the structural component and the wearable component for more than 12 hours. After the components are evenly mixed, take out the powder for use. binder. When stirring, use a "one-shaped" stirring paddle with a length of 30-50 cm, and a flat-bottomed mixing tank with an inner diameter of 40-80 cm. The thickness of the material must not exceed one-third of the height of the inner diameter of the mixing tank. min. The binder is added at one time. Stir...

Embodiment 3

[0036] Raw material composition: structural component: mixture of β-NiAl intermetallic compound and MCrAlY alloy powder, the weight ratio of β-NiAl intermetallic compound and MCrAlY alloy powder is 3:1; abradable component: polyamide and hexagonal boron nitride A mixture of polyamide and hexagonal boron nitride in a weight ratio of 3:1; adhesive: alkyd varnish.

[0037] Raw material ratio: 15wt% of abradable components, 3wt% of adhesives, and the balance of structural components.

[0038] Preparation method: Mix the structural component and the wearable component by ball milling for more than 12 hours. After the components are evenly mixed, take out the powder for use. binder. When stirring, use a "one-shaped" stirring paddle with a length of 30-50 cm, and a flat-bottomed mixing tank with an inner diameter of 40-80 cm. The thickness of the material must not exceed one-third of the height of the inner diameter of the mixing tank. min. The binder is added in two times, the fi...

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Abstract

The invention relates to aggregation-type composite powder for a high-temperature abradable seal coating layer and a preparing method of the aggregation-type composite powder. The aggregation-type composite powder which has good spraying technology adaptability is prepared through the method of mechanical milling, room-temperature binding and aggregation. The powder comprises MCrAlY alloy powder, alloy powder with beta-NiAl intermetallic compounds as a main phase, polybenzoate powder, boron nitride, binding agents and the like. Raw materials can be the combination of the materials, and the binding agents can be inorganic matter or organic matter. The powder comprises beta-NiAl intermetallic compound high-temperature-resisting components, heat-resisting temperature of an existing metal-based seal coating layer can be raised, and compared with a ceramic seal coating layer, the coating layer has great thermal shock resistance and can be used under the working condition of the high temperature of 1000 DEG C for a long time. The powder has wide application in gas channel sealing of a combustion gas turbine high-temperature part, especially of a high-pressure turbine.

Description

technical field [0001] The invention relates to the field of thermal spraying materials, in particular to an agglomerated composite powder for a high-temperature abradable sealing coating and a preparation method thereof. Background technique [0002] In order to improve the efficiency of gas turbines and reduce fuel consumption, gas path sealing technology is an important means. As an important gas path sealing technology, abradable sealing coating has been widely used in gas turbines. At present, there are nearly 20 kinds of abradable sealing coating materials. In the low-to-medium temperature section of gas turbines, the existing abradable sealing coating materials can meet the requirements of use, but in the high-temperature parts of gas turbines, especially the parts of high-pressure turbines, The working temperature reaches or even exceeds 1000°C. Due to the harsh working conditions of high temperature and high pressure, the coating will quickly fail due to corrosion,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/00B22F9/04
Inventor 于月光任先京章德铭刘建明沈婕杨永琦程旭莹刘通
Owner BEIJING GENERAL RES INST OF MINING & METALLURGY
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