A kind of preparation method of ysz-lsm composite thermal barrier coating material

A technology of thermal barrier coating and composite powder is applied in the field of preparation of YSZ-LSM composite thermal barrier coating materials, which can solve the problems of sintering and high thermal conductivity, and achieve good sintering resistance and coating thermal conductivity. Low, even compounding effect

Active Publication Date: 2015-12-09
BGRIMM ADVANCED MATERIALS SCI & TECH +1
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Problems solved by technology

[0004] The present invention proposes a preparation method of a YSZ-LSM composite thermal barrier coating material to solve the problems that existing thermal barrier coating materials have high thermal conductivity and sintering will occur after long-term operation in a high-temperature environment

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  • A kind of preparation method of ysz-lsm composite thermal barrier coating material

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[0011] The specific embodiment of the present invention proposes a preparation method of YSZ-LSM composite thermal barrier coating material with low thermal conductivity and high sintering resistance. The composite powder synthesis steps mainly include: preparation of raw material solution, synthesis of precursor powder and heat treatment process. Preparation of YSZ-LSM Thermal Barrier Coating Composite Powder With LSM powder as the core of the composite powder, YSZ as the coating layer, and urea as the combustion agent, the YSZ-LSM composite powder was prepared by a low-temperature self-combustion in-situ synthesis method. YSZ is Y 2 O 3 Stable ZrO 2 The abbreviation of LSM is La 1-x Sr x MnO 3 The specific steps are as follows:

[0012] Step 1, using Zr (NO 3 ) 4 and Y(NO 3 ) 3 The solution was used as a metal ion source to synthesize YSZ, and the molar ratio was 97:3 to 90:10 to prepare Zr (NO 3 ) 4 and Y(NO 3 ) 3 Mix the solution, and then make the mixture ac...

Embodiment 1

[0018] Formulated Zr(NO 3 ) 4 and Y(NO 3 ) 3 solution, the reagent is Zr (NO 3 ) 4 ·6H 2 O and Y (NO 3 ) 3 ·6H 2 O, the experimental water was deionized water. Weigh 22gZr(NO 3 ) 4 ·6H 2 O and 20gY (NO 3 ) 3 ·6H 2 O, added to 2L deionized water and fully stirred to dissolve, after mixing evenly, add LSM powder to form a mixture, the ratio of LSM mass to the theoretical mass of YSZ to be generated is 4:6, and then ultrasonically treated for 30 minutes. According to urea and solution metal ion Zr 4+ and Y 3+ The molar ratio of the total amount is 6:1. The urea is weighed and added to the above mixed solution, and then the mixture is transferred to an evaporating dish and heated and evaporated at 400 ° C to make the mixed solution gelatinized until it forms a colloidal shape with LSM as the dispersed phase. Continue to heat until burning to obtain primary powder. The primary powder was calcined at 1000° C. for 2 hours to obtain YSZ-LSM composite powder.

[0019...

Embodiment 2

[0021] The YSZ-LSM composite powder obtained by the combustion method was mixed with 2 times the mass of deionized water to prepare a slurry, and the YSZ-LSM composite powder mass 10wt.% binder K30 glue and appropriate amount of other auxiliary agents were added to the slurry. Including polyethylene glycol, n-octanol, and tackifier, after 12 hours of ball milling, it is sent to a centrifugal atomization dryer for spray granulation. The feed rate was 500 mL / h, the centrifugal speed was 10500 rpm / min, the inlet and outlet temperatures were 350°C and 150°C, respectively, and the drying gas was N 2 . The collected powder was heat-treated in a muffle furnace at 1000° C. for 2 hours to obtain spherical YSZ-LSM granulated powder material. Then the YSZ-LSM granulated powder was sprayed onto the metal substrate by GTV atmospheric plasma spraying equipment to obtain the YSZ-LSM thermal barrier coating.

[0022] Using the technical solution provided by this specific embodiment, YSZ-LSM...

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Abstract

The invention discloses a method for preparing a YSZ-LSM composite heat-barrier coating material. The method comprises the steps of synthesizing YSZ from a 5-60wt% Zr(NO3)4 solution and a 5-60wt% Y(NO3)3 solution, which serve as metal ion sources, preparing a mixed solution of Zr(NO3)4 and Y(NO3)3 according to the mole ratio of 97: 3 to 90: 10, preparing a mixture according to the LSM / YSZ mass ratio of 1: 9 to 7: 3, and then, carrying out ultrasonic treatment; adding an incendiary agent into the mixture in a manner that the total mole ratio of the incendiary agent to metal ions (Zr<4+> and Y<3+>) in a solution is 1: 1 to 8: 1, then, heating the incendiary agent added mixed solution, and gelling the incendiary agent added mixed solution until jelly which takes LSM as a dispersion phase is formed; continuing to heat the jelly until low-temperature self-propagating combustion occurs, so as to obtain initial powder, and then, carrying out phase-forming roasting treatment on the initial powder, thereby preparing YSZ-LSM heat-barrier coating composite powder. The YSZ-LSM composite heat-barrier coating material has the advantages that the compounding of YSZ and LSM is uniform, the coating heat conductivity is low, the sintering resistance is good, and the like.

Description

technical field [0001] The invention relates to a preparation method of a YSZ-LSM composite thermal barrier coating material, belonging to the technical field of thermal barrier coatings. Background technique [0002] Thermal barrier coating, also known as thermal barrier coating, refers to a metal-ceramic composite coating system composed of a ceramic layer with good thermal insulation and a metal bonding layer. In the aviation field, it is mainly used to provide thermal protection for hot end components such as turbine engine blades, combustion chambers, and heat shields that work under high temperature hot air flow conditions. In addition, the thermal barrier coating can also isolate the substrate from the high temperature gas, so that the metal or alloy substrate is protected from high temperature oxidation, gas corrosion and erosion. Under the existing technical conditions, a thermal barrier coating with a thickness of 250 μm can reduce the surface temperature of the b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/48C04B35/50C04B35/622
Inventor 于月光梁明德沈婕张鑫张淑婷冀晓鹃王辉吴琼
Owner BGRIMM ADVANCED MATERIALS SCI & TECH
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