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A kind of nano-oxide dispersion reinforced heat-resistant zirconium alloy and preparation method thereof

A nano-oxide and dispersion-enhanced technology, which is applied in the field of alloy materials, can solve the problems of poor thermal stability of intermetallic compounds, coarse grains, rapid coarsening of phases and grains, etc., and achieve macro-segregation without components, uniform and fine grains Effect

Active Publication Date: 2022-07-29
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There are serious ingot segregation, uneven microstructure, and coarse grains. In addition, the thermal stability of intermetallic compounds is poor, and the precipitated phases and grains are prone to rapid coarsening under high temperature service conditions, which seriously limits the quality of zirconium. Alloy service temperature and strength and other issues

Method used

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  • A kind of nano-oxide dispersion reinforced heat-resistant zirconium alloy and preparation method thereof
  • A kind of nano-oxide dispersion reinforced heat-resistant zirconium alloy and preparation method thereof
  • A kind of nano-oxide dispersion reinforced heat-resistant zirconium alloy and preparation method thereof

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preparation example Construction

[0035] A preparation method of nano-oxide dispersion reinforced heat-resistant zirconium alloy, comprising the following steps:

[0036] Step S1, the zirconium alloy block is subjected to hydrodehydrogenation treatment to obtain pre-alloyed powder;

[0037] Specifically, the zirconium alloy block includes the following components by weight percentage:

[0038] Sn 1.2-1.6%, Fe 0.2-0.5%, Cr 0.1-0.3%, the balance is Zr and inevitable impurities;

[0039] The hydrogenation adopts a gas tube furnace, and the hydrogenation temperature is 300-500 ℃. After the hydrogenation, it is crushed by ball milling for 5-10 hours and the rotation speed is 300 rpm to obtain the hydrogenated alloy powder; 20µm pre-alloyed powder with hydrogen content not exceeding 100ppm.

[0040] In step S2, the powder material and pre-alloyed powder containing Y, Ti, O elements are put into a high-speed pendulum ball mill, and fully mixed under the protection of an inert gas to obtain a mixed powder;

[0041]...

Embodiment 1

[0052] A preparation method of nano-oxide dispersion reinforced heat-resistant zirconium alloy, comprising the following steps:

[0053] Step S1, preparation of pre-alloyed powder: put the zirconium alloy block into a gas tube furnace, hydrogenate it at 500°C to obtain a zirconium hydride alloy block, put the hydride zirconium alloy block into a ball mill, the speed is 300rpm, and the ball milling time is 5h to quickly break it to obtain hydrogenation Alloy powder, the hydrogenated alloy powder is dehydrogenated at 500°C to obtain pre-alloyed powder, the average particle size of the pre-alloyed powder is 5-20 μm, and the hydrogen content does not exceed 100 ppm;

[0054] The zirconium alloy block includes the following components by weight:

[0055] Sn 1.3%, Fe 0.2%, Cr 0.1%, the balance is Zr and inevitable impurities;

[0056] Step S2, powder premixing: the pre-alloyed powder is 0.4wt% TiO 2 Powder, 0.4wt% YH 2 The powder and the pre-alloyed powder are put into a high-spe...

Embodiment 2

[0065] Step S1, preparation of pre-alloyed powder: put the zirconium alloy block into a gas tube furnace, hydrogenate it at 500°C to obtain a zirconium hydride alloy block, put the hydride zirconium alloy block into a ball mill, the speed is 300rpm, and the ball milling time is 5h to quickly break it to obtain hydrogenation Alloy powder, hydrogenated alloy powder is dehydrogenated at 500 ℃ to obtain pre-alloyed powder;

[0066] The zirconium alloy block includes the following components by weight:

[0067] Sn 1.3%, Fe 0.2%, Cr 0.1%, the balance is Zr and inevitable impurities;

[0068] Step S2, powder pre-mixing: the pre-alloyed powder is 0.4wt% Y by weight 2 O 3 Powder, 0.4wt% TiH 2 The powder and the pre-alloyed powder are put into a high-speed pendulum ball mill for pre-mixing, the vibration time is 1h, and the frequency is 1400rpm to obtain the mixed powder;

[0069] Step S3, mechanical alloying: the mixed powder is put into a zirconia ball milling jar, and ball millin...

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Abstract

The invention discloses a nano-oxide dispersion-reinforced heat-resistant zirconium alloy, which comprises a zirconium alloy matrix, Y-Ti-O and Y-Zr-O nano-oxide precipitation phases dispersed and distributed in the zirconium alloy matrix, wherein Y- The particle size of Ti‑O and Y‑Zr‑O nano-oxide precipitates is 2‑10 nm and the number density is 1‑3×10 15 Pieces / m 2 . The nano-oxide dispersion-enhanced heat-resistant zirconium alloy provided by the invention realizes the re-dissolution and re-precipitation mechanism of the solute through mechanical alloying and thermal densification, and obtains high number density, low nanometer scale, high thermal stability, The dispersed Y-Ti-O and Y-Zr-O nano-oxide phases can greatly improve the strength and heat resistance of zirconium alloys. The invention also provides a preparation method of nano-oxide dispersion-reinforced heat-resistant zirconium alloy.

Description

technical field [0001] The invention relates to the technical field of alloy materials, in particular to a nano-oxide dispersion-reinforced heat-resistant zirconium alloy and a preparation method thereof. Background technique [0002] Zirconium alloys have the advantages of low neutron absorption cross section, corrosion resistance, easy processing and forming, and good radiation stability. They are widely used in the manufacture of nuclear reactor fuel cladding tubes and other core structural components. At present, zirconium alloys for nuclear use are prepared by melting and casting methods. After heat treatment, intermetallic compound-type precipitation phases are formed to achieve dispersion strengthening of the zirconium alloy matrix. There are serious segregation of ingots, uneven structure and composition, and coarse grains. In addition, the thermal stability of intermetallic compounds is poor, and the precipitates and grains are prone to rapid coarsening under high t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C16/00B22F9/04B22F3/02B22F3/15C22C1/05C22C1/10
CPCC22C16/00C22C32/001B22F9/04B22F3/02B22F3/15C22C1/058B22F2009/043B22F2009/041
Inventor 江勇吴华建商佳程
Owner CENT SOUTH UNIV
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