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Preparation method of superfine yttrium oxide doped tungsten composite precursor powder

A technology of precursor powder and yttrium oxide, applied in chemical instruments and methods, rare earth metal compounds, rare earth metal oxides/hydroxides, etc., can solve the problem of weakening, uneven particle size of the second phase, and inability to disperse well Distribution and other issues, to achieve the effect of uniformity improvement, grain size refinement, and good uniformity

Active Publication Date: 2017-04-19
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Currently W-Y 2 o 3 The preparation of composite nano-precursor powder mostly uses tungsten powder and Y 2 o 3 Alloying route by powder ball milling, this method will lead to Y 2 o 3 The particle size of the second phase is not uniform and is mainly segregated at the grain boundary of the tungsten matrix, which cannot be well dispersed into the tungsten crystal, which greatly weakens the Y 2 o 3 The improvement effect on the performance of tungsten alloy, especially the ductile-brittle transition temperature, recrystallization temperature and microstructure uniformity and other indicators

Method used

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  • Preparation method of superfine yttrium oxide doped tungsten composite precursor powder
  • Preparation method of superfine yttrium oxide doped tungsten composite precursor powder
  • Preparation method of superfine yttrium oxide doped tungsten composite precursor powder

Examples

Experimental program
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Effect test

Embodiment 1

[0031] (1) Dissolve 1.29g of yttrium nitrate hexahydrate in 120mL of distilled water, use mechanical stirring and ultrasonic treatment (the speed of mechanical stirring is 1000rpm, and the power of ultrasonic treatment is 120W). After fully dissolving and dispersing, add 10gAPT and 0.25gPEG to it (The concentration of APT is 0.08g / mL, the quality of yttrium nitrate hexahydrate is 12.9% of the quality of ammonium paratungstate; the quality of surfactant is 2.5% of the quality of ammonium paratungstate), and the solution is prepared.

[0032] (2) Add 10 mL of concentrated nitric acid (the volume ratio of which to distilled water is 1 / 12) into the above solution for chemical precipitation reaction, and the reaction lasts for 30 min to form a suspension.

[0033] (3) 130 mL of absolute ethanol (1 time of the total volume of the suspension) was added to the suspension and continued to react for 4 h under the conditions of mechanical stirring and ultrasonic treatment. The suspension...

Embodiment 2

[0037] (1) Dissolve 2.57g of yttrium nitrate hexahydrate in 120mL of distilled water, mechanically stir and sonicate (the rotational speed of mechanical stirring is 2000rpm, and the power of sonication is 120W). After fully dissolving and dispersing, add 20gAPT and 2gSDS into it ( The concentration of APT is 0.25g / mL, the quality of yttrium nitrate hexahydrate is 12.9% of the ammonium paratungstate quality; The quality of surfactant is 10% of the ammonium paratungstate quality), makes solution.

[0038] (2) Add 20 mL of concentrated nitric acid (volume ratio of 1 / 6 to distilled water) into the above solution for chemical precipitation reaction, and the reaction lasts for 30 min to form a suspension.

[0039] (3) 140 mL of absolute ethanol (1 time of the total volume of the suspension) was added to the suspension and continued to react for 3 h under the conditions of mechanical stirring and ultrasonic treatment. The suspension was then vacuum filtered and the obtained precipitate...

Embodiment 3

[0042] (1) Dissolve 2.57g of yttrium nitrate hexahydrate in 120mL of distilled water, and use mechanical stirring and ultrasonic treatment (the rotating speed of mechanical stirring is 2000rpm, and the power of ultrasonic treatment is 100W). After fully dissolving and dispersing, add 20gAPT and 3gPVP into it ( The concentration of APT is 0.17g / mL, the quality of yttrium nitrate hexahydrate is 12.9% of ammonium paratungstate quality; The quality of surfactant is 15% of ammonium paratungstate quality), makes solution.

[0043] (2) Add 20 mL of concentrated nitric acid (volume ratio of 1 / 6 to distilled water) into the above solution for chemical precipitation reaction, and the reaction lasts for 30 min to form a suspension.

[0044] (3) 140 mL of absolute ethanol (1 time of the total volume of the suspension) was added to the suspension and continued to react for 3 h under the conditions of mechanical stirring and ultrasonic treatment. The suspension was then vacuum filtered and ...

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Abstract

The invention relates to a preparation method of superfine yttrium oxide doped tungsten composite precursor powder. The preparation method comprises the steps: dissolving ammonium paratungstate, yttrium nitrate hexahydrate and a surfactant into water, and carrying out sufficient dispersion and dissolution through mechanical stirring and ultrasonic treatment to prepare a solution; adding concentrated HNO3 into the solution under stirring and ultrasonics to carry out precipitation reaction to form a suspension liquid; adding absolute ethyl alcohol into the suspension liquid to further react, filtering the reacted suspension liquid, and cleaning a precipitate by using absolute ethyl alcohol or distilled water; after drying the precipitate, grinding the precipitate to obtain composite powder, then, placing the composite powder into a tube furnace, and calcining the composite powder in a nitrogen or argon flow to obtain W-Y2O3 composite oxide powder; and carrying out two-step reduction in the tube furnace by using pure hydrogen to obtain the superfine yttrium oxide doped tungsten composite precursor powder. The average grain size of the powder reaches about 10nm, and the uniformity of the grain size is good. Meanwhile, Y2O3 is also uniformly doped, which provides a good basis for subsequent calcination for obtaining fine-grain compact tungsten-based alloy.

Description

technical field [0001] The present invention proposes a method of applying surfactant and ultrasonic treatment in wet chemical method to prepare ultrafine W-Y 2 o 3 The technology of composite precursor powder belongs to the technical field of powder preparation engineering. Background technique [0002] Tungsten-based materials are widely used in information, energy, Metallurgy, aerospace, national defense and nuclear industry and other fields. Meanwhile, tungsten-based materials are also considered to be the most promising plasmonic facing materials (PFMs). However, the brittleness of tungsten-based materials has been a problem that limits its application in the field of nuclear fusion, including low-temperature brittleness, recrystallization brittleness, and neutron irradiation brittleness. [0003] Studies have shown that an effective way to improve the performance of tungsten-based alloys is to reduce the grain size of the alloy to ultra-fine size, even to nano-scal...

Claims

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Application Information

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IPC IPC(8): C01F17/00B82Y40/00
CPCB82Y40/00C01F17/206C01P2004/03C01P2004/04C01P2004/64C01P2004/80C01P2006/80
Inventor 马宗青董智柳楠刘永长刘晨曦余黎明
Owner TIANJIN UNIV
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