CN100587102C - Atmosphere plasma spraying method for manufacturing hyperthermia sealing coating - Google Patents

Atmosphere plasma spraying method for manufacturing hyperthermia sealing coating Download PDF

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CN100587102C
CN100587102C CN200710120617A CN200710120617A CN100587102C CN 100587102 C CN100587102 C CN 100587102C CN 200710120617 A CN200710120617 A CN 200710120617A CN 200710120617 A CN200710120617 A CN 200710120617A CN 100587102 C CN100587102 C CN 100587102C
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matrix
plasma spraying
seal coating
binding agent
coating
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CN101109062A (en
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徐惠彬
马国辉
宫声凯
郭洪波
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Beihang University
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Abstract

The invention discloses a BaLn2Ti3 plus XO10 plus Y seal coating spray preparation technological method by adopting atmospheric plasma. Due to the low melting point of the BaLn2Ti3 plus XO10 plus Y, the inventor proposes that: first, the power of the plasma spray gun is lowered to melt the material and keep the structure from decomposing; second, the distance between the powder feeding port of thespray gun and the plasma spray nozzle is widened, and the distance between the powder feeding port and the base plate is reduced, thus increasing the temperature of the base plate; third, the combination of the first one and the second one prevents the problems of seal coating decomposition and lower bonding strength of the coating interface due to the super-high flame temperature of the plasma or fast cooling speed of the base plate.

Description

The air plasma spraying method of preparation high temperature seal coating
Technical field
The present invention relates to a kind of preparation method who is applicable to the high temperature seal coating, more particularly say, be meant that a kind of employing air plasma spraying prepared goes out BaLn 2Ti 3+XO 10+Y(Ln=Pr, La, Nd or Sm, the value of X is 0.1～1, the value of Y is 0.1～2) the high temperature seal coating.
Background technology
Along with the direction of aero-turbine to high flow capacity ratio, high thrust-weight ratio and high inlet temperature develops, the heat-resisting ability of high-temperature component is also had higher requirement.The hot-end component of engine need turn round under higher temperature, thereby improves the efficient of aircraft engine, reduces oil consumption, improves its thrust-weight ratio.As high-performance aircraft engine of new generation, its turbine inlet design temperature has reached more than 1800 ℃, through advanced air film cooling, the surface Working Temperature that arrives the elevated temperature heat end pieces will be more than 1400 ℃, be higher than the warm ability of holding of hot-end component superalloy far away, apply thermal barrier coating high temperature resistant and that have good heat-proof quality, can reduce the working temperature of alloy surface at the superalloy matrix surface, prolong the work-ing life of hot-end component, improve efficiency of engine.The turbine outer shroud is the key member of aircraft engine, and its effect is to form dynamic seal with the engine turbine blade, improves the efficiency of combustion of combustion gas.The Working environment very severe of turbine outer shroud requires the high temperature resistant combustion gas of turbine outer shroud to ablate on the one hand, on the other hand, but requires outer ring surface to possess certain rigidity and wear hardness.In order to satisfy above requirement, usually at turbine outer shroud surface-coated high temperature seal coating (a kind of special thermal barrier coating).For aircraft engine of new generation, its turbine outer shroud working temperature will be more than 1200 ℃.
The sealing coating material of aircraft engine is selected matrix material mostly for use at present.By metallographic phase, self-lubricating is nonmetal and many apertures are formed.As the compound seal coating of nickel/graphite.Its preparation method is generally plasma spraying tack coat and flame plating matrix material seal coating, forms porous, loose coating microtexture, makes it have low thermal conductance simultaneously, but performances such as higher abradability, antiscour.Yet the use temperature of the seal coating of spraying preparation is lower than 900 ℃ mostly at present, and obviously this does not conform to the high temperature development trend of engine.Therefore be starved of and explore the new more sealing coating material of elevated operating temperature that tolerates, and adapt with it be coated with the stratification preparation method.
The method for preparing at present the high temperature seal coating is mainly air plasma spraying.This kind method power height, the flame temperature height can melt all metals and oxide compound, in the spraying process, melts the particle temperature height, speed is fast, can obtain typical laminate structure coating.Yet, for low-melting heat barrier coat material, as adopting conventional spraying coating process, will in spraying process, decompose, be difficult to the composition of control coating, influence coating performance.
Summary of the invention
The object of the present invention is to provide a kind of employing air plasma spraying to prepare BaLn 2Ti 3+XO 10+YThe processing method of (Ln=Pr, La, Nd or Sm, the value of X is 0.1～1, the value of Y is 0.1～2) seal coating is at BaLn 2Ti 3+XO 10+YThe fusing point of compound lower (1820 ℃), the technical barrier that is difficult to adopt conventional spray paint technology to carry out the seal coating preparation proposes.The inventor proposes: (A) reduce the power of plasma gun, make material melts and material keep its structure and do not decompose; (B) increase the powder feeding mouth of spray gun and the distance of plasma nozzle, reduce the distance of powder feeding mouth and substrate, thereby improved substrate temperature; (C) preparation method of the present invention has prevented from combination (A) and (B) to decompose and the low problem of coating interface bonding strength because of plasma flame temperature sealing coating material too high or that cause occurs when the substrate speed of cooling is too fast.
Preparation BaLn provided by the invention 2Ti 3+XO 10+YThe plasma spray coating process of (Ln=Pr, La, Nd or Sm, the value of X is 0.1～1, the value of Y is 0.1～2) high temperature seal coating makes BaLn after the spraying 2Ti 3+XO 10+YKeep the laminated perovskite structure of original block materials, kept soft, and high thermal expansivity (1500 ℃, 10.5～13.5 * 10 -6K -1), lower thermal conductivity (1500 ℃, 0.51～0.91Wm -1K -1), (material behaviors such as 200～400MPa), coating has the structure of porosity and looseness to soft simultaneously, can form excellent interface with matrix and combine that (the test bonding force under the mechanical stretching is 25～35MPa), makes BaLn 2Ti 3+XO 10+YSeal coating had better high temperature resistant (1500 ℃) but excellent specific properties such as wear hardness, heat shock resistance, long lifetime.
Description of drawings
Fig. 1 adopts the BaLa from spraying such as atmosphere 2Ti 3O 10Scanning electronic microscope (SEM) image.Matrix is a nickel base superalloy, and tack coat is NiCrAlY.
Fig. 2 adopts the BaLa from spraying such as atmosphere 2Ti 3O 10Surperficial X-ray diffraction (XRD) result.Find that the material after the spraying is also undecomposed.
Fig. 3 adopts the BaPr from spraying such as atmosphere 2Ti 3O 10The thermal expansivity of seal coating
Fig. 4 adopts the BaPr from spraying such as atmosphere 2Ti 3O 10Scanning electronic microscope (SEM) image.Matrix is a nickel base superalloy, and tack coat is NiCrAlY.
Embodiment
The present invention is a kind of air plasma spraying method for preparing the high temperature seal coating, and this spraying method reduces the power of plasma gun by (A), makes material melts and material keep its structure and does not decompose; (B) increase the powder feeding mouth of spray gun and the distance of plasma nozzle, reduce the distance of powder feeding mouth and substrate, thereby improved substrate temperature; (C) preparation method of the present invention has prevented from combination (A) and (B) to decompose because of plasma flame temperature sealing coating material too high or that cause occurs when the substrate speed of cooling is too high.Concrete preparation process has:
The first step: on matrix, prepare tack coat
(A) with the matrix chosen after No. 150, No. 300, No. 400, No. 800 sand paperings are smooth, put into dehydrated alcohol and carry out ultrasonic cleaning 2～8min, obtain first matrix;
Matrix surface roughness Ra＜0.8 after sand papering;
(B) adopt low-voltage plasma spraying technology that first matrix is prepared tack coat, obtain second matrix;
The low-voltage plasma spraying processing parameter:
Figure C20071012061700061
Second step: the preparation of seal coating
(A) choose sealing coating material, and put into binding agent and stir and make mixed solution; The consumption of sealing coating material and binding agent is to add 30～40g sealing coating material in every 100g binding agent;
Described binding agent is stirred in 80～100 ℃ by Sudan Gum-arabic and deionized water and makes, and the consumption of Sudan Gum-arabic and deionized water is to add 0.1～1g Sudan Gum-arabic in every 200ml deionized water;
(B) mixed solution is put into sponging granulator and carried out mist projection granulating, obtaining particle diameter is the spheroidal particle of 20～50 μ m;
(C) make seal coating on second matrix that spheroidal particle is adopted air plasma spraying technology (B) step in the first step obtain;
The air plasma spraying processing parameter:
Figure C20071012061700071
In above-mentioned preparation process, matrix is the Ni based high-temperature alloy of trade mark K3, and the tack coat composition that is sprayed on the matrix is NiCrAlY, and the Chemical Composition of sealing coating material is BaLn 2Ti 3+XO 10+Y(Ln=Pr, La, Nd or Sm, the value of X is 0.1～1, the value of Y is 0.1～2), when actual fabrication is operated, obtain target component according to the atom number proportioning in the chemical formula after, use the sponging granulator granulation again.BaLn in the present invention 2Ti 3+XO 10+YSealing coating material is the material of a class laminated perovskite structure, and a little less than layer and the interlayer bonding force, it is soft to have matter, characteristics such as good toughness.
Through the above-mentioned BaLn for preparing 2Ti 3+XO 10+YSeal coating have high thermal expansivity (1500 ℃, 10.5～13.5 * 10 -6K -1), low thermal conductivity (1500 ℃, 0.51～0.91Wm -1K -1), (material behaviors such as 200～400MPa), the coating that makes through air plasma spraying simultaneously has vesicular structure to soft, can form excellent interface with matrix and combine that (the test bonding force under the mechanical stretching is 25～35MPa).
Embodiment 1:System BaLa 2Ti 3O 10The high temperature seal coating
The first step: on matrix, prepare tack coat
(A) with the matrix (the Ni based high-temperature alloy of trade mark K3) chosen after No. 150, No. 300, No. 400, No. 800 sand paperings are smooth, put into dehydrated alcohol and acetone and carry out ultrasonic cleaning 5min, obtain first matrix; Matrix surface roughness Ra＜0.8 after sand papering;
(B) adopt low-voltage plasma spraying technology that first matrix is prepared the NiCrAlY tack coat, obtain second matrix;
Low-voltage plasma spraying equipment is the low-voltage plasma spraying system of Beijing Aeronautics Research Inst's development;
The low-voltage plasma spraying processing parameter:
Figure C20071012061700081
Second step: the preparation of seal coating
(A) choosing sealing coating material is BaLa 2Ti 3O 10, and put into binding agent and stir and make mixed solution; The consumption of sealing coating material and binding agent is to add the 30g sealing coating material in every 100g binding agent;
Described binding agent is stirred in 100 ℃ by Sudan Gum-arabic and deionized water and makes, and the consumption of Sudan Gum-arabic and deionized water is to add the 0.5g Sudan Gum-arabic in every 200ml deionized water;
(B) mixed solution is put into sponging granulator and carried out mist projection granulating, obtaining particle diameter is the spheroidal particle of 25～35 μ m;
(C) make seal coating on second matrix that spheroidal particle is adopted air plasma spraying technology (B) step in the first step obtain; Air plasma spraying equipment is the METCO 7MC type air plasma spraying equipment that U.S. GE company produces;
The air plasma spraying processing parameter:
Figure C20071012061700082
Figure C20071012061700091
Through the above-mentioned BaLa for preparing 2Ti 3O 10It is 11.5 * 10 that seal coating adopts German Netzsch DIL 402E type high temperature dilatometer to record thermal expansivity -6K -1(1500 ℃); (TPS 2500 system, Sweden), the thermal conductivity that obtains is 0.91Wm to adopt the transient state plane heat source method to measure thermal conductivity -1K -1(1500 ℃); It is 220MPa that the HXS-1000Z type microhardness tester that adopt Shanghai ten thousand to weigh precision instrument company limiteds record hardness; With scanning electronic microscope to BaLa 2Ti 3O 10Sealing coating material carries out morphology observation, the coating that makes through air plasma spraying has vesicular structure (referring to shown in Figure 1), and the bonding force that the WDW-20 type microcomputer control electronics universal testing machine machine that adopts Changchun trier factory to produce is tested seal coating and matrix is 28MPa.As seen interfacial combined function excellence.Simultaneously, analyze to adopt the BaLa from spraying such as atmosphere 2Ti 3O 10Seal coating surface X-ray diffraction (XRD) collection of illustrative plates shows the sealing coating material after the spraying and undecomposed (as shown in Figure 2).
Embodiment 2:System BaLa 2Ti 4O 12The high temperature seal coating
The first step, second goes on foot identical with embodiment 1, and difference is the material difference that seal coating is selected.
The BaLa that makes 2Ti 4O 12The thermal expansivity of high temperature seal coating is 12.1 * 10 -6K -1(1500 ℃), thermal conductivity are 0.85Wm -1K -1(1500 ℃), hardness are that the bonding force of 240MPa, coating and matrix is 30MPa.
Embodiment 3:System BaPr 2Ti 3O 10The high temperature seal coating
First step is identical with embodiment 1;
Second step: the preparation of seal coating
(A) choosing sealing coating material is BaPr 2Ti 3O 10, and put into binding agent and stir and make mixed solution; The consumption of sealing coating material and binding agent is to add the 35g sealing coating material in every 100g binding agent;
Described binding agent is stirred in 100 ℃ by Sudan Gum-arabic and deionized water and makes, and the consumption of Sudan Gum-arabic and deionized water is to add the 1g Sudan Gum-arabic in every 200ml deionized water;
(B) mixed solution is put into sponging granulator and carried out mist projection granulating, obtaining particle diameter is the spheroidal particle of 30～50 μ m;
(C) make seal coating on second matrix that spheroidal particle is adopted air plasma spraying technology (B) step in the first step obtain;
The air plasma spraying processing parameter:
Figure C20071012061700101
The BaPr that makes through aforesaid method 2Ti 3O 10The thermal expansivity of high temperature seal coating is 11.4 * 10 -6K -1(1500 ℃) (as shown in Figure 3), thermal conductivity are 0.62Wm -1K -1(1500 ℃), hardness are 240MPa.Has loose and porous structure.(as shown in Figure 4) bonding force of coating and matrix is for being 25.6MPa.
Adopt the method system BaPr identical with embodiment 3 2Ti 4O 12High temperature seal coating, the thermal expansivity of this coating are 10.9 * 10 -6K -1(1500 ℃), thermal conductivity are 0.79Wm -1K -1(1500 ℃), hardness are 289MPa.Has loose and porous structure.The bonding force of coating and matrix is 26.3MPa.
Embodiment 4System BaSm 2Ti 3.5O 11The high temperature seal coating
First step is identical with embodiment 1;
Second step: the preparation of seal coating
(A) choosing sealing coating material is BaSm 2Ti 3.5O 11, and put into binding agent and stir and make mixed solution; The consumption of sealing coating material and binding agent is to add the 35g sealing coating material in every 100g binding agent;
Described binding agent is stirred in 100 ℃ by Sudan Gum-arabic and deionized water and makes, and the consumption of Sudan Gum-arabic and deionized water is to add the 1g Sudan Gum-arabic in every 200ml deionized water;
(B) mixed solution is put into sponging granulator and carried out mist projection granulating, obtaining particle diameter is the spheroidal particle of 30～50 μ m;
(C) make seal coating on second matrix that spheroidal particle is adopted air plasma spraying technology (B) step in the first step obtain;
The air plasma spraying processing parameter:
Figure C20071012061700111
The BaSm that makes through aforesaid method 2Ti 3.5O 11The thermal expansivity of high temperature seal coating is 12.7 * 10 -6K -1(1500 ℃), thermal conductivity are 0.57Wm -1K -1(1500 ℃), hardness are 318MPa.Has loose and porous structure.The bonding force of coating and matrix is 33.5MPa.
Embodiment 5System BaNd 2Ti 3O 10The high temperature seal coating
First step is identical with embodiment 1;
Second step: the preparation of seal coating
(A) choosing sealing coating material is BaNd 2Ti 3O 10, and put into binding agent and stir and make mixed solution; The consumption of sealing coating material and binding agent is to add the 35g sealing coating material in every 100g binding agent;
Described binding agent is stirred in 100 ℃ by Sudan Gum-arabic and deionized water and makes, and the consumption of Sudan Gum-arabic and deionized water is to add the 1g Sudan Gum-arabic in every 200ml deionized water;
(B) mixed solution is put into sponging granulator and carried out mist projection granulating, obtaining particle diameter is the spheroidal particle of 30～50 μ m;
(C) make seal coating on second matrix that spheroidal particle is adopted air plasma spraying technology (B) step in the first step obtain;
The air plasma spraying processing parameter:
Figure C20071012061700121
The BaNd that makes through aforesaid method 2Ti 3O 10The thermal expansivity of high temperature seal coating is 12.5 * 10 -6K -1(1500 ℃), thermal conductivity are 0.87Wm -1K -1(1500 ℃), hardness are 325MPa.Has loose and porous structure.The bonding force of coating and matrix is 27.9MPa.

Claims (2)

1, a kind of air plasma spraying method for preparing the high temperature seal coating is characterized in that following preparation steps is arranged:
The first step: on matrix, prepare tack coat
(A) with the matrix chosen after No. 150, No. 300, No. 400 and No. 800 sand paperings are smooth, put into dehydrated alcohol and carry out ultrasonic cleaning 2～8min, obtain first matrix;
Matrix surface roughness Ra＜0.8 after sand papering;
(B) adopt low-voltage plasma spraying technology that first matrix is prepared tack coat, obtain second matrix;
The low-voltage plasma spraying processing parameter:
Figure C2007101206170002C1
Second step: the preparation of seal coating
(A) choose sealing coating material, and put into binding agent and stir and make mixed solution; The consumption of sealing coating material and binding agent is to add 30～40g sealing coating material in every 100g binding agent;
Described binding agent is stirred in 80～100 ℃ by Sudan Gum-arabic and deionized water and makes, and the consumption of Sudan Gum-arabic and deionized water is to add 0.1～1g Sudan Gum-arabic in every 200ml deionized water;
The Chemical Composition of described sealing coating material is BaLn 2Ti 3+XO 10+Y, Ln=Pr, La, Nd or Sm, the value of X is 0.1～1, the value of Y is 0.1～2;
(B) mixed solution is put into sponging granulator and carried out mist projection granulating, obtaining particle diameter is the spheroidal particle of 20～50 μ m;
(C) spheroidal particle is adopted preparing high-temp seal coating on air plasma spraying technology second matrix that (B) step obtains in the first step;
The air plasma spraying processing parameter:
Figure C2007101206170002C2
Figure C2007101206170003C1
2, air plasma spraying method according to claim 1 is characterized in that: the BaLn for preparing 2Ti 3+XO 10+YThe thermal expansivity of seal coating in the time of 1500 ℃ is 10.5 * 10 -6K -1～13.5 * 10 -6K -1, the thermal conductivity in the time of 1500 ℃ is 0.51～0.91Wm -1K -1, soft is 200～400MPa.
CN200710120617A 2007-08-22 2007-08-22 Atmosphere plasma spraying method for manufacturing hyperthermia sealing coating Expired - Fee Related CN100587102C (en)

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Publication number Priority date Publication date Assignee Title
CN101921979B (en) * 2009-06-10 2012-12-12 沈阳黎明航空发动机(集团)有限责任公司 Method for preparing seal coating by plasma spraying
CN102242333A (en) * 2011-06-23 2011-11-16 江苏宇天港玻新材料有限公司 Process for manufacturing coated glass by utilizing rotary ceramic target
CN108411242B (en) * 2018-01-31 2020-12-18 广东省新材料研究所 Thermal barrier coating with particle erosion resistant surface layer and preparation method thereof
CN108950454B (en) * 2018-08-24 2020-07-07 中国航空制造技术研究院 High-temperature ceramic-based abradable seal coating structure and preparation method thereof
CN114588835A (en) * 2022-03-21 2022-06-07 江苏拜富科技股份有限公司 Spray granulation process for producing low-temperature electronic packaging material

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