Yttria stabilized zirconia powder, its preparation method and formed coating

A technology of zirconia powder and yttrium oxide, which is applied in the field of thermal spraying technology and ceramic materials, can solve the problems of coating quality degradation, coating peeling failure, difficult phase structure transformation, etc.

Inactive Publication Date: 2012-11-07
CHINESE ACAD OF AGRI MECHANIZATION SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them, the microemulsion method is a kind of powder making method developed in recent years. The powder obtained is spherical and has the same particle size. The disadvantage is that the production cost is high and it is difficult to realize large-scale production.
At present, the advantage of the preparation method of nano-YPSZ agglomerated powder is that it can obtain powder with fine nanocrystals and good sphericity. Particle breakage, gasification and other losses in powder and plasma, excessive unmelted particles leading to coating quality degradation,

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  • Yttria stabilized zirconia powder, its preparation method and formed coating
  • Yttria stabilized zirconia powder, its preparation method and formed coating
  • Yttria stabilized zirconia powder, its preparation method and formed coating

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preparation example Construction

[0039] The preparation method of the yttria-stabilized zirconia powder of the present invention may comprise:

[0040] Step 1: Choose continuous co-precipitation method or other chemical synthesis methods to obtain YPSZ powder wet material (the precursor has been reacted or precipitated). At this time, the selected YPSZ nano powder wet material has been washed many times, and the powder purity reaches 99.9%. The density is 10~80nm, Y in the powder 2 o 3 The content is 6-8wt.%. At this time, the powder has not been calcined at a high temperature and remains amorphous; in addition, the content of Na, K, Ca, Mg, Al, Si, Ti, Fe and other elemental impurities in the original powder is controlled to be lower than 100ppm;

[0041] Step 2: Dry the obtained wet material quickly at low temperature, the drying temperature is controlled at 100-400 ° C, and the drying time is controlled at 1-3 hours; at this time, a part of the nano-YPSZ powder mixed with crystalline and amorphous states...

Embodiment 1

[0051] Amorphous (non-crystalline) nanoparticles synthesized by continuous co-precipitation method form a slurry, the composition of which is 7YSZ, in which the content of different impurities is lower than 100ppm, and the purity is greater than 99.9%; use high-purity water to adjust the solid content of the slurry to 50 %, use a stirring ball mill to mill for 2 hours, and after the dispersion is uniform, the slurry is granulated using a centrifugal spray drying equipment. Dry at 150°C for 1 hour, sieve the powder to 53-90 μm, and calcine the powder. The calcination temperature is 800°C, the holding time is 24 hours, and the heating rate is 1°C / min. The grain size is 36nm. After calcination, the powder is sieved again. The sieving particle size ranges from 45 to 75 μm. The calcination powder is subjected to plasma densification treatment, using DC plasma spraying equipment, using high-purity water as the water quenching medium, and the plasma densification power It is 18KW, an...

Embodiment 2

[0055] Amorphous (non-crystalline) nanoparticles synthesized by continuous co-precipitation method constitute slurry, wherein YSZ material Y 2 o 3 The content is 6.83%, and the content of each impurity is lower than 100ppm. Use high-purity water to adjust the solid content of the slurry to 45%, and use a stirring ball mill to mill for 2 hours. After the slurry is evenly dispersed, use a centrifugal spray drying equipment for granulation treatment. The main parameters are as follows: The inlet temperature is 250°C, the outlet temperature is 120°C, and the rotation speed of the atomizing disc is 9000rpm. The collected granulated material is sieved to a powder size of 60-115μm, and the powder is calcined. The calcining temperature is 1100°C, the holding time is 12h, and the heating rate is The average single crystal size of the nanoparticles in the spherical powder after calcination is 2°C / min. The average single crystal size of the nanoparticles in the spherical powder after cal...

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Abstract

The invention discloses a yttria stabilized zirconia powder with low impurity content and a preparation method thereof. The yttria stabilized zirconia powder is a composite powder with a nanostructured shell cladding nanometer particles. The preparation method comprises the following steps of: carrying out low temperature drying by the use of a nanometer YPSZ amorphous powder synthesized by a continuous coprecipitation method; carrying out ball milling dispersion on parts of the nanometer YPSZ powder which has undergone crystalline conversion, and carrying out spray drying granulation, screening and calcining on dispersed slurry; and carrying out plasma densification treatment, drying and screening on the calcined powder so as to finally obtain the spherical powder with the nanostructured shell cladding nanometer particles. The YPSZ powder for thermal spraying has very low impurity content, and the content of a single impurity is lower than 100 ppm. A compact shell is formed outside the nanometer YPSZ agglomerate particles, thus raising apparent density and fluidity of the agglomerate powder and increasing the melting effect of the powder in plasma.

Description

technical field [0001] The invention belongs to the technical fields of thermal spraying technology and ceramic materials, and in particular relates to a partially stabilized zirconia spherical powder with low impurity content for thermal spraying and a preparation method thereof. Background technique [0002] Zirconia-based thermal barrier coatings have been successfully applied to protect aero-engine combustors and other high-temperature components since the 1970s. After years of material improvement and optimization, yttria partially stabilized zirconia material (YPSZ) with yttrium oxide as a stabilizer has many excellent characteristics, such as high toughness, high strength, good thermal shock resistance, large thermal expansion coefficient, heat resistance Corrosion, etc., have important application value in many high-tech fields. YPSZ is by far the most classic thermal barrier coating material and has been widely used in gas turbines. [0003] Although yttrium oxide...

Claims

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Application Information

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IPC IPC(8): C04B35/48C04B35/626
Inventor 武铁军何箐汪瑞军王伟平吕玉芬
Owner CHINESE ACAD OF AGRI MECHANIZATION SCI
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