A method for refining the size of yttrium oxide at grain boundaries in yttrium oxide dispersion-strengthened tungsten-based alloys

A technology of dispersion strengthening and yttrium oxide, applied in the field of powder metallurgy, can solve the problems of weakening of the second phase interface, cracking of the second phase particles, deterioration of the mechanical properties of the alloy, etc., so as to improve the comprehensive mechanical properties, processing performance and distribution uniformity. improved effect

Active Publication Date: 2021-06-08
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Under the action of external loads, due to the incongruity of deformation, the large-sized Y at these grain boundaries 2 o 3 The second phase particles are often the place of stress concentration, which leads to W matrix and Y 2 o 3 The interfacial bonding of the second phase is weakened and the particles of the second phase are broken, thus losing its proper strengthening effect, which eventually leads to the deterioration of the mechanical properties of the alloy

Method used

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  • A method for refining the size of yttrium oxide at grain boundaries in yttrium oxide dispersion-strengthened tungsten-based alloys
  • A method for refining the size of yttrium oxide at grain boundaries in yttrium oxide dispersion-strengthened tungsten-based alloys

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Dissolve 0.257g of yttrium nitrate hexahydrate and 0.04g of lanthanum nitrate hexahydrate in 120mL of deionized water, stir them with mechanical stirring to fully disperse and dissolve them, and then add 20g of ammonium paratungstate (APT) into it (concentration of ammonium paratungstate in the solution is 0.17g / mL; the quality of yttrium nitrate hexahydrate is 0.0129 times of the quality of ammonium paratungstate; the quality of lanthanum nitrate hexahydrate is 0.154 times of the quality of yttrium nitrate hexahydrate);

[0028] (2) Add 15 mL of concentrated HNO with a concentration of 65% to 68% 3 Add it to the above solution, and under the action of mechanical stirring, the chemical precipitation reaction is uniformly carried out for 30 minutes until a suspension is formed (the volume ratio of nitric acid to deionized water is 1 / 8);

[0029] (3) Add 135 mL of absolute ethanol to the suspension and continue to react for 3 hours. During the entire reaction, the mec...

Embodiment 2

[0034] (1) Dissolve 0.741g of yttrium nitrate hexahydrate and 0.148g of hafnium oxychloride in 120mL of deionized water, stir them with mechanical stirring to fully disperse and dissolve them, and then add 30g of ammonium paratungstate (APT) into it (the concentration of ammonium paratungstate in the solution is 0.25g / mL; the quality of yttrium nitrate hexahydrate is 0.0247 times of the quality of ammonium paratungstate; the quality of hafnium oxychloride is 0.2 times of the quality of yttrium nitrate hexahydrate);

[0035] (2) 10 mL of concentrated HNO with a concentration of 65% to 68% 3 Add it into the above solution, and under the action of mechanical stirring, the chemical precipitation reaction is uniformly carried out for 20 minutes until a suspension is formed (the volume ratio of nitric acid to deionized water is 1 / 12);

[0036] (3) Add 260 mL of absolute ethanol to the suspension and continue to react for 2 hours. During the entire reaction, the mechanical stirring i...

Embodiment 3

[0041] (1) Dissolve 0.2g of yttrium nitrate hexahydrate and 0.06g of lanthanum nitrate hexahydrate in 120mL of deionized water, stir them with mechanical stirring to fully disperse and dissolve them, and then add 10g of ammonium paratungstate (APT) into it (concentration of ammonium paratungstate in the solution is 0.08g / mL; the quality of yttrium nitrate hexahydrate is 0.02 times of the quality of ammonium paratungstate; the quality of lanthanum nitrate hexahydrate is 0.3 times of the quality of yttrium nitrate hexahydrate);

[0042] (2) Add 30 mL of concentrated HNO with a concentration of 65% to 68% 3 Add it to the above solution, and carry out the chemical precipitation reaction under mechanical stirring for 60 minutes until a suspension is formed (the volume ratio of nitric acid to deionized water is 1 / 4);

[0043] (3) Add 150 mL of absolute ethanol to the suspension to continue the reaction for 5 hours. During the entire reaction process, the mechanical stirring is in wo...

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Abstract

The invention relates to a method for refining the size of yttrium oxide at the grain boundary in yttrium oxide dispersion-strengthened tungsten alloy. Dissolving yttrium nitrate hexahydrate, lanthanum nitrate hexahydrate or hafnium oxychloride in deionized water, stirring them mechanically to make them fully dispersed, Dissolve, and then add ammonium paratungstate; HNO 3 Add it into the above solution under mechanical stirring to make the chemical precipitation reaction uniformly form a white suspension; add absolute ethanol to the suspension to continue the reaction, filter the reacted suspension and wash the obtained precipitate with absolute ethanol; The precipitate is dried, ground to obtain a composite powder, and then calcined; the obtained composite is oxidized to a powder and subjected to two-step reduction with pure hydrogen in a tube furnace to obtain W‑Y 2 o 3 Composite precursor powder; then sintered under a hydrogen atmosphere to obtain W‑Y with significantly refined yttrium oxide at grain boundaries 2 o 3 alloy. The size of yttrium oxide at the grain boundary of yttrium oxide dispersion strengthened tungsten alloy is obviously refined, and the distribution uniformity is improved.

Description

technical field [0001] The invention provides a method for refining the size of yttrium oxide at grain boundaries in yttrium oxide dispersion-strengthened tungsten alloys by adding oxides, which belongs to the technical field of powder metallurgy. Background technique [0002] Metal tungsten is a body-centered cubic refractory metal. It has ultra-high melting point, high stability, high strength and hardness, and low thermal expansion coefficient. These excellent properties make tungsten widely used in high-temperature fields. Such as solid targets for spallation neutron sources and key components of rockets and missiles. However, considering the synergistic effect of multi-field coupling such as high-energy particle irradiation, high stress field, and hydrogen and its isotope retention in thermonuclear fusion devices, the first wall facing the plasma is required to maintain its own microstructure and mechanical properties. Stable, especially to maintain its high temperatur...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C27/04C22C1/04C22C1/10B22F9/16B22F9/20
CPCB22F9/16B22F9/22B22F2009/165C22C1/10C22C27/04
Inventor 马宗青董智李冲刘永长刘晨曦余黎明
Owner TIANJIN UNIV
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