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Lanthanum zirconate-based ceramic granulated powder for atmospheric plasma spraying and preparation method thereof

A lanthanum zirconate-based, granulated powder technology, which is applied in the field of ceramic powder, can solve the problems of difficult granulation, hinder spherical granulation, and high cost, and achieve the effect of facilitating further refinement, reducing pore content, and improving densification

Active Publication Date: 2018-05-11
INNER MONGOLIA UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0007] However, the precipitation method and the sol-gel method use the liquid phase method to prepare ultra-fine powder. During the preparation process, due to the large specific surface area of ​​the nano-powder, agglomeration will occur between the nanoparticles, which is random and difficult. Dispersed, resulting in large powder particles, hindering the subsequent spherical granulation, and it is difficult to obtain powders that meet the requirements of APS
In addition, the production cycle of these liquid-phase methods for preparing ultrafine powders is long and the cost is high, which is not suitable for producing large quantities of lanthanum zirconate powders.
The solid-phase method mainly uses the ball milling method combined with high-temperature firing to obtain lanthanum zirconate powder. The shape of the prepared powder is irregular, and it is difficult to granulate. It is difficult to obtain a powder that meets the requirements of APS.

Method used

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  • Lanthanum zirconate-based ceramic granulated powder for atmospheric plasma spraying and preparation method thereof
  • Lanthanum zirconate-based ceramic granulated powder for atmospheric plasma spraying and preparation method thereof
  • Lanthanum zirconate-based ceramic granulated powder for atmospheric plasma spraying and preparation method thereof

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preparation example Construction

[0046] The invention provides a method for preparing lanthanum zirconate-based ceramic granulated powder for atmospheric plasma spraying, comprising the following steps:

[0047] (1) Provide a mixture comprising zirconia and lanthanide oxide; the particle size of the mixture is below 60nm; the lanthanide oxide includes one or more of lanthanum oxide, cerium oxide, erbium oxide and ytterbium oxide various;

[0048] (2) sintering after pressing the mixture obtained in the step (1) to obtain a sintered body;

[0049] (3) performing primary crushing on the sintered body obtained in the step (2) to obtain primary powder;

[0050] (4) Sand mill the primary powder obtained in the step (3) by using segmental sand milling to obtain sand mill powder; the segmental sand mill comprises low-speed sand mill and high-speed sand mill in turn, and The speed of grinding is 2350~2450r / min, and the speed of the high-speed sand mill is 2550~2650r / min;

[0051] (5) Spray drying and granulating the...

Embodiment 1

[0084] (1) According to the stoichiometric ratio, La with a chemical purity ≥ 99.99% 2 o 3 and ZrO 2 The powder is placed in a polyurethane ball mill tank with a molar ratio of 1:2, using zirconia balls as the grinding body, deionized water as the dispersion medium, and wet milling at a speed of 70r / min for 20min, the mass ratio of the material ball is 1:2, and the material water The ratio is 1:1, the amount of dispersant polymethacrylic acid amine is 0.7% of the powder, and the slurry is passed through a 80-mesh sieve after ball milling.

[0085] (2) The above-mentioned slurry is pumped into a sand mill, with zirconia beads of 0.3-0.4mm particle size as the grinding body and deionized water as the dispersion medium. Min and 2700r / min were ground for 1 hour each, and after sand milling, the slurry was dried at 85°C for 20 hours to obtain nanopowders below 50nm. The prepared nano-powder was tested by TEM, and the results were as follows: figure 1 shown.

[0086] (3) In ord...

Embodiment 2

[0091] (1) According to the stoichiometric ratio, La with a chemical purity ≥ 99.99% 2 o 3 , CeO 2 and ZrO 2 The powder is placed in a polyurethane ball mill tank according to the stoichiometric molar ratio of 5:3:7, with zirconia balls as the grinding body, deionized water as the dispersion medium, and wet milling at a speed of 70r / min for 15 minutes, and the mass ratio of the ball to material is 1: 2. The ratio of material to water is 1:1, the amount of dispersant polymethacrylic acid amine is 0.7% of the powder, and the slurry is passed through an 80-mesh sieve after ball milling.

[0092] (2) The above slurry is pumped into a sand mill, with zirconia beads with a particle size of 0.3-0.4 mm as the grinding body and deionized water as the dispersion medium. After pre-grinding at 2000r / min for 15 minutes, it will gradually increase to 2250r / min, 2550r / min Min and 2750r / min were ground for 1 hour each, and after sand milling, the slurry was dried at 85°C for 20 hours to ob...

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Abstract

The invention provides lanthanum zirconate-based ceramic granulated powder for atmospheric plasma spraying and a preparation method thereof. The preparation method comprises the steps that mixed materials with the particle size of 60 nm or below are pressed into blocks, the material point distance among powder particles is reduced, the content of pores is reduced, and the densification is improved; mixed oxide blocks are obtained, and a solid phase reaction in the following sintering process is conducted smoothly and conveniently. In combination of the sintering process, the solid phase reaction of different oxides in the mixed materials is achieved, a lanthanum zirconate-based material is obtained and further crushed, low-speed sanding with low energy consumption is conducted at first, the loss of grinding bodies is reduced, the preliminary refinement of the larger sintered particles after sintering is achieved, and further refinement is facilitated; in combination with high-speed sanding at the second stage, nano-powder is obtained, the dispersion is good, the particle size is even, and the granulation requirements are met. Subsequently, in strict accordance with a defined granulation mode, the ceramic granulated powder meeting APS requirements is obtained.

Description

technical field [0001] The invention relates to the technical field of ceramic powders, in particular to a lanthanum zirconate-based ceramic granulated powder for atmospheric plasma spraying and a preparation method thereof. Background technique [0002] Lanthanum zirconate (La 2 Zr 2 o 7 ) is a material with low thermal conductivity, good high temperature stability and sintering resistance above 1200 ° C. On this basis, other rare earth elements can be used to dope La and Zr sites, which can further improve thermal physical properties. Therefore, lanthanum zirconate-based ceramic materials have gradually become a new type of thermal barrier coating material, which can be used to protect high-temperature working parts of aero turbine engines. [0003] Atmospheric plasma spraying (APS) uses plasma to form a heating zone to heat the passing powder particles to a molten or semi-molten state, and deposit them on the surface of the substrate to obtain a layered coating. [00...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/48C04B35/626
CPCC04B35/48C04B35/62695C04B2235/3224C04B2235/3227C04B2235/3229C04B2235/5436C04B2235/5463
Inventor 谢敏宋希文包金小周芬安胜利郜建全张永和郭文荣
Owner INNER MONGOLIA UNIV OF SCI & TECH
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