Y0.5Dy0.5Ta0.5Nb0.5O4 tantalum ceramic material and preparation method thereof

Abstract

The invention discloses a Y0.5Dy0.5Ta0.5Nb0.5O4 tantalum ceramic material and a preparation method thereof. The preparation method of the Y0.5Dy0.5Ta0.5Nb0.5O4 tantalum ceramic comprises the steps ofmixing the raw materials of Ta2O5, Y2O3, Nb2O5 and Dy2O3 in a preset ratio to obtain a mixed material; stirring and drying the mixed material under a first preset condition to form a blank; and carrying out grinding, plasma sintering and heat treatment on the blank to form the tantalum ceramic. The method is simple in preparation process, short in production time and low in cost; the prepared tantalum ceramic material has good stability, high purity and low impurity content; and the tantalum ceramic material is a stable M-phase single phase, has good compactness and uniform element content, and is free of composition segregation problem.

Description

technical field

[0001] The invention relates to the technical field of new materials, in particular to a Y 0.5 Dy 0.5 Ta 0.5 Nb 0.5 o 4 Tantalum series ceramic material and preparation method thereof. Background technique

[0002] Ceramic materials are widely and important used in the fields of aerospace, transportation, and large-scale thermal power plants. A lot of research work has been carried out at home and abroad in order to obtain ceramic materials with excellent performance.

[0003] The survey shows that the current rare earth tantalate ceramic material (RETaO4) has good high temperature chemical stability, low thermal conductivity and iron elastic toughening and other characteristics. With the continuous deepening of research on new ceramics, high-entropy ceramics stand out among many new ceramics with the design idea of ​​"multivariate and high chaos". The present invention combines the advantages of high-entropy ceramics and yttrium tantalate ceramics. By ...

Examples

preparation example Construction

[0045] like figure 1 As shown, in the first aspect of the embodiments of the present invention, there is provided a Y 0.5 Dy 0.5 Ta 0.5 Nb 0.5 o 4 A method for preparing tantalum-based ceramics, including:

[0046] S1: put raw material Ta 2 o 5 , Y 2 o 3 , Nb 2 o 5 and Dy 2 o 3 Mixing at a preset ratio to obtain a mixture;

[0047] S2: stirring and drying the mixed material under the first preset condition to form a billet;

[0048] S3: Grinding, plasma sintering and heat treatment are performed on the blank to form tantalum-based ceramics.

[0049] The service temperature of the tantalum-based ceramic material prepared by the above method can reach 1600°C, the thermal conductivity is also greatly reduced compared with YSZ (zirconia ceramic material), and the performance of various aspects is improved to varying degrees. Using Dy element to replace Y element and Nb element to replace Ta element can undoubtedly further reduce the thermal conductivity of the mater...

Embodiment 1

[0076] Weigh tantalum oxide (Ta 2 o 5 )6.7642g, yttrium oxide (Y 2 o 3 )3.4562g, dysprosium oxide (Dy 2 o 3 )5.7081g, niobium oxide (Nb 2 o 5 )4.0602g;

[0077] After mixing in absolute ethanol, place in a planetary ball mill for ball milling (the speed of the ball mill is 300r / min, and the ball milling time is 3h);

[0078] Put the ball-milled suspension in a glass, and stir it at a constant temperature on a heating magnetic stirrer until it becomes viscous;

[0079] Put it into a constant temperature drying oven and set the temperature at 50°C to dry for 9 hours and then take it out;

[0080] Use an agate bowl to grind the dried powder material to obtain the powder required for the experiment;

[0081] Weighed 3.5g of the powder to be sintered on an electronic balance, poured it into a cylindrical hollow graphite mold with a diameter of 20mm, and placed a layer of graphite paper between the powder to be sintered and the graphite mold to prevent powder leakage and st...

Embodiment 2

[0083] Weigh tantalum oxide (Ta 2 o 5 )6.7642g, yttrium oxide (Y 2 o 3 )3.4562g, dysprosium oxide (Dy 2 o 3 )5.7081g, niobium oxide (Nb 2 o 5 )4.0602g;

[0084] After mixing in absolute ethanol, place in a planetary ball mill for ball milling (the speed of the ball mill is 300r / min, and the ball milling time is 3h);

[0085] Put the ball-milled suspension in a glass, and stir it at a constant temperature on a heating magnetic stirrer until it becomes viscous;

[0086] Put it into a constant temperature drying box and dry it for 10 hours at a temperature set at 60°C, then take it out;

[0087] Use an agate bowl to grind the dried powder material to obtain the powder required for the experiment;

[0088]Weighed 3.5g of the powder to be sintered on an electronic balance, poured it into a cylindrical hollow graphite mold with a diameter of 20mm, and placed a layer of graphite paper between the powder to be sintered and the graphite mold to prevent powder leakage and stren...

technical field

[0001] The invention relates to the technical field of new materials, in particular to a Y 0.5 Dy 0.5 Ta 0.5 Nb 0.5 o 4 Tantalum series ceramic material and preparation method thereof. Background technique

[0002] Ceramic materials are widely and important used in the fields of aerospace, transportation, and large-scale thermal power plants. A lot of research work has been carried out at home and abroad in order to obtain ceramic materials with excellent performance.

[0003] The survey shows that the current rare earth tantalate ceramic material (RETaO4) has good high temperature chemical stability, low thermal conductivity and iron elastic toughening and other characteristics. With the continuous deepening of research on new ceramics, high-entropy ceramics stand out among many new ceramics with the design idea of ​​"multivariate and high chaos". The present invention combines the advantages of high-entropy ceramics and yttrium tantalate ceramics. By ...

Examples

preparation example Construction

[0045] like figure 1 As shown, in the first aspect of the embodiments of the present invention, there is provided a Y 0.5 Dy 0.5 Ta 0.5 Nb 0.5 o 4 A method for preparing tantalum-based ceramics, including:

[0046] S1: put raw material Ta 2 o 5 , Y 2 o 3 , Nb 2 o 5 and Dy 2 o 3 Mixing at a preset ratio to obtain a mixture;

[0047] S2: stirring and drying the mixed material under the first preset condition to form a billet;

[0048] S3: Grinding, plasma sintering and heat treatment are performed on the blank to form tantalum-based ceramics.

[0049] The service temperature of the tantalum-based ceramic material prepared by the above method can reach 1600°C, the thermal conductivity is also greatly reduced compared with YSZ (zirconia ceramic material), and the performance of various aspects is improved to varying degrees. Using Dy element to replace Y element and Nb element to replace Ta element can undoubtedly further reduce the thermal conductivity of the mater...

Embodiment 1

[0076] Weigh tantalum oxide (Ta 2 o 5 )6.7642g, yttrium oxide (Y 2 o 3 )3.4562g, dysprosium oxide (Dy 2 o 3 )5.7081g, niobium oxide (Nb 2 o 5 )4.0602g;

[0077] After mixing in absolute ethanol, place in a planetary ball mill for ball milling (the speed of the ball mill is 300r / min, and the ball milling time is 3h);

[0078] Put the ball-milled suspension in a glass, and stir it at a constant temperature on a heating magnetic stirrer until it becomes viscous;

[0079] Put it into a constant temperature drying oven and set the temperature at 50°C to dry for 9 hours and then take it out;

[0080] Use an agate bowl to grind the dried powder material to obtain the powder required for the experiment;

[0081] Weighed 3.5g of the powder to be sintered on an electronic balance, poured it into a cylindrical hollow graphite mold with a diameter of 20mm, and placed a layer of graphite paper between the powder to be sintered and the graphite mold to prevent powder leakage and st...

Embodiment 2

[0083] Weigh tantalum oxide (Ta 2 o 5 )6.7642g, yttrium oxide (Y 2 o 3 )3.4562g, dysprosium oxide (Dy 2 o 3 )5.7081g, niobium oxide (Nb 2 o 5 )4.0602g;

[0084] After mixing in absolute ethanol, place in a planetary ball mill for ball milling (the speed of the ball mill is 300r / min, and the ball milling time is 3h);

[0085] Put the ball-milled suspension in a glass, and stir it at a constant temperature on a heating magnetic stirrer until it becomes viscous;

[0086] Put it into a constant temperature drying box and dry it for 10 hours at a temperature set at 60°C, then take it out;

[0087] Use an agate bowl to grind the dried powder material to obtain the powder required for the experiment;

[0088]Weighed 3.5g of the powder to be sintered on an electronic balance, poured it into a cylindrical hollow graphite mold with a diameter of 20mm, and placed a layer of graphite paper between the powder to be sintered and the graphite mold to prevent powder leakage and stren...

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