Yttrium-stabilized zirconium oxide hafnium powder for thermal spraying and preparation method thereof

A technology of yttrium-stabilized zirconia and thermal spraying, which is applied in the field of thermal spraying material preparation technology, can solve the problems of high cost, low output, and high production cost of hafnium oxide-based thermal barrier coatings, so as to reduce raw material costs, reduce hard agglomeration, The effect of increasing the service temperature of the coating

Pending Publication Date: 2021-05-28
QUANNAN JINGXIN ENVIRONMENTAL PROTECTION MATERIALCO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The content of hafnium in the earth's crust is 0.00045%, and it is often associated with zirconium in nature. There is no hafnium raw material that exists alone. Hafnium-based thermal barrier coatings have high production costs and are expensive

Method used

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  • Yttrium-stabilized zirconium oxide hafnium powder for thermal spraying and preparation method thereof
  • Yttrium-stabilized zirconium oxide hafnium powder for thermal spraying and preparation method thereof
  • Yttrium-stabilized zirconium oxide hafnium powder for thermal spraying and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Embodiment 1: a kind of yttrium-stabilized zirconium hafnium oxide powder and its preparation method for thermal spraying, its steps are as follows:

[0028] 1) Preparation of yttrium-stabilized zirconium hafnium oxide precursor: according to the addition of yttrium source, Y 2 o 3 Metering and addition of hafnium source are based on HfO 2 Metering, zirconium source addition amount is ZrO 2 Metering, according to the weight ratio Y 2 o 3 :Zr(Hf)O 2 =7.8:92.2 and weight ratio HfO 2 :ZrO 2 =1:4 Put zirconium sulfate, hafnium tetrachloride and yttrium sulfate (50 Kg in total as oxides) into a batching tank with 750 L of pure water and stir evenly, then add pure water to 900 L to obtain yttrium , zirconium, hafnium mixed material liquid, the mixed material liquid is transferred to the charging tank after being filtered by filter cloth; the yttrium, zirconium and hafnium mixed material liquid in the charging tank is put into 25 wt% ammonium bicarbonate solution under ...

Embodiment 2

[0031] Embodiment 2: a kind of yttrium-stabilized zirconium hafnium oxide powder and its preparation method for thermal spraying, its steps are as follows:

[0032]1) Preparation of yttrium-stabilized zirconium hafnium oxide precursor: according to the addition of yttrium source, Y 2 o 3 Metering and addition of hafnium source are based on HfO 2 Metering, zirconium source addition amount is ZrO 2 Metering, according to the weight ratio Y 2 o 3 :Zr(Hf)O 2 =7.5:92.5 and weight ratio HfO 2 :ZrO 2 =1:5 Put zirconium oxychloride, hafnium oxychloride and yttrium chloride (50 Kg in total as oxides) into a batching tank with 750 L of pure water and stir evenly, then add pure water to 900 L obtains yttrium, zirconium, hafnium mixed material liquid, and the mixed material liquid is transferred to the charging barrel after being filtered by filter cloth; The yttrium, zirconium, hafnium mixed material liquid in the charging barrel is dropped into 25 wt% carbonic acid under stirring...

Embodiment 3

[0035] Embodiment 3: a kind of yttrium-stabilized zirconium hafnium oxide powder and its preparation method for thermal spraying, its steps are as follows:

[0036] 1) Preparation of yttrium-stabilized zirconium hafnium oxide precursor: according to the addition of yttrium source, Y 2 o 3 Metering and addition of hafnium source are based on HfO 2 Metering, zirconium source addition amount is ZrO 2 Metering, take the weight ratio HfO 2 :ZrO 2 =1:3.5 Adjust the extraction conditions of the zirconium and hafnium extraction and separation production line. 2 o 3 :Zr(Hf)O 2 =8:92 Put the yttrium feed liquid obtained from the rare earth yttrium production line into the batching tank and stir evenly, then add pure water to 900 L to obtain the mixed feed liquid of yttrium, zirconium, and hafnium (the three are converted into oxides to measure a total of 50 kg), the mixture After the liquid is filtered through the filter cloth, it is transferred to the charging tank; the mixed li...

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Abstract

The invention discloses yttrium-stabilized zirconium oxide hafnium powder for thermal spraying and a preparation method of the yttrium-stabilized zirconium oxide hafnium powder. The preparation method comprises the following steps: firstly, preparing a yttrium-stabilized zirconium oxide hafnium precursor, then carrying out primary calcination, ball milling, sanding and spray granulation to prepare yttrium-stabilized zirconium oxide hafnium granulated powder, and finally, carrying out secondary calcination and screening to prepare the yttrium-stabilized zirconium oxide hafnium powder for thermal spraying. The yttrium-stabilized zirconium oxide hafnium powder is prepared by using ammonium bicarbonate as a precipitator, so that hard agglomeration during calcination is reduced; the yttrium-stabilized zirconium oxide hafnium powder is used as a thermal barrier coating material, and compared with traditional yttrium-stabilized zirconium oxide powder, the service temperature of the coating is increased; the content proportion of zirconium and hafnium in the yttrium-stabilized zirconium oxide hafnium powder for thermal spraying is controllable, and compared with yttrium-stabilized hafnium oxide powder, the raw material cost is reduced.

Description

technical field [0001] The invention relates to a technology for preparing a thermal spraying material for a thermal barrier coating, in particular to a yttrium-stabilized zirconium hafnium oxide powder for thermal spraying and a preparation method thereof. Background technique [0002] The application of thermal barrier coatings (TBCs) to aero-engines can significantly reduce the surface temperature of the engine turbine blade alloy, prolong its service life and improve the working efficiency of the engine. At present, the most widely used thermal barrier coatings (TBCs) are yttria-stabilized zirconia materials, that is, 6-8 wt% YSZ. However, the yttrium-stabilized zirconia coating material has essential deficiencies. Its service temperature cannot exceed 1250°C. When this temperature exceeds this temperature, irreversible phase transformation at high temperature will occur, and serious sintering will occur, which will accelerate the peeling off of the coating. In this reg...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/48C04B35/626
CPCC04B35/48C04B35/62605C04B35/62695C04B2235/3246
Inventor 邬元旭邹志鹏郭树军徐欣陈其森邱日安钟明龙曾侃何德华
Owner QUANNAN JINGXIN ENVIRONMENTAL PROTECTION MATERIALCO LTD
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