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Method for improving sintering compactness of W-Y2O3 composite material

A technology of W-Y2O3 and composite materials, which is applied in the field of improving the sintering compactness of W-Y2O3 composite materials, can solve problems such as cracks, and achieve the effects of uniform powder particle size distribution, increasing relative density, and refining grain size.

Inactive Publication Date: 2019-05-10
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, tungsten has a series of brittle problems, and it is easy to generate cracks at the grain boundary when it is subjected to thermal shock or He particle irradiation.

Method used

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  • Method for improving sintering compactness of W-Y2O3 composite material
  • Method for improving sintering compactness of W-Y2O3 composite material
  • Method for improving sintering compactness of W-Y2O3 composite material

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Embodiment 1

[0025] In this embodiment, improve W-Y 2 o 3 A method for sintering compactness of composite materials, comprising the steps of:

[0026] Step 1: Preparation of powder

[0027] Ammonium metatungstate (AMT, Aladdin, purity ≥ 99.95%), yttrium nitrate (Y(NO 3 ) 3 ·6H 2 O, Aladdin, purity ≥ 99.5%) and surfactant triethanolamine oleate (C 16 h 22 N 4 o 3 , purity 99%) were respectively dissolved in a certain amount of deionized water, and then mixed uniformly. Oxalic acid (C 2 h 2 o 4 2H 2 O, analytically pure) was added as a precipitant into the mixed solution and stirred evenly, ultrasonically oscillated at 120°C and stirred continuously until the precursor was obtained, the dried and ground powder was put into a tube furnace for reduction, and the reducing atmosphere was hydrogen, and finally get w-y 2 o 3 Composite powder, powder particle size is 200nm.

[0028] The addition amounts of triethanolamine oleate, yttrium nitrate and oxalic acid are respectively 1%, ...

Embodiment 2

[0035] In this embodiment, improve W-Y 2 o 3 A method for sintering compactness of composite materials, comprising the steps of:

[0036] Step 1: Preparation of powder

[0037] Ammonium metatungstate (AMT, Aladdin, purity ≥ 99.95%), yttrium nitrate (Y(NO 3 ) 3 ·6H 2 O, Aladdin, purity ≥ 99.5%) and surfactant triethanolamine oleate (C16 h 22 N 4 o 3 , purity 99%) were respectively dissolved in a certain amount of deionized water, and then mixed uniformly. Oxalic acid (C 2 h 2 o 4 2H 2 O, analytically pure) was added as a precipitating agent into the mixed solution and stirred evenly, ultrasonically oscillated at 130°C and stirred continuously until the precursor was obtained, the dried and ground powder was put into a tube furnace for reduction, and the reducing atmosphere was hydrogen, and finally get w-y 2 o 3 Composite powder, powder particle size is 300nm.

[0038] The addition amounts of triethanolamine oleate, yttrium nitrate and oxalic acid are respectivel...

Embodiment 3

[0045] In this embodiment, improve W-Y 2 o 3 A method for sintering compactness of composite materials, comprising the steps of:

[0046] Step 1: Preparation of powder

[0047] Ammonium metatungstate (AMT, Aladdin, purity ≥ 99.95%), yttrium nitrate (Y(NO 3 ) 3 ·6H 2 O, Aladdin, purity ≥ 99.5%) and surfactant triethanolamine oleate (C 16 h 22 N 4 o 3 , purity 99%) were respectively dissolved in a certain amount of deionized water, and then mixed uniformly. Oxalic acid (C 2 h 2 o 4 2H 2 O, analytically pure) was added into the mixed solution as a precipitant and stirred evenly, ultrasonically oscillated at 140°C and stirred continuously until the precursor was obtained, the dried and ground powder was put into a tube furnace for reduction, and the reducing atmosphere was hydrogen, and finally get w-y 2 o 3 Composite powder, powder particle size is 400nm.

[0048] The addition amounts of triethanolamine oleate, yttrium nitrate and oxalic acid are respectively 3%, ...

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Abstract

The invention discloses a method for improving the sintering compactness of a W-Y2O3 composite material. The method comprises the steps that a second phase Y2O3 is added into a tungsten-based materialby adopting a wet chemistry method, and meanwhile, a surfactant is added so as to obtain the W-Y2O3 composite material. According to the method, based on the actual situation that tungsten is taken as PFMs, based on the consideration that the grain boundary density needs to be improved, and the second phase Y2O3 is added into the tungsten-based material by using the wet chemical method, so that the grain boundary strength is improved, and the problem that crystal grain distribution is not uniform due to traditional mechanical alloying is solved; and in order to further improve the density ofa tungsten-based alloy, the surfactant is added in the process of preparing W-Y2O3 composite powder, the grain refinement is further promoted, the distribution is uniform, the sintering density and heat conduction performance of the W-Y2O3 composite material are improved, so that the brittleness problem is effectively relieved.

Description

technical field [0001] The invention relates to a tungsten-based composite material and a preparation method, in particular to improve W-Y 2 o 3 A method for sintering densification of composites. Background technique [0002] Human yearning and demand for clean energy are increasing day by day, prompting human beings to seek efficient clean energy. Due to its high energy density and no radioactivity, nuclear fusion energy has become one of the energy sources for human beings to achieve green and sustainable development. While nuclear fusion can bring opportunities, it also brings unprecedented challenges. When the nuclear fusion reactor is working, PFMs (Plasma Facing Materials) will be bombarded by high-energy particles, and the surface of the material will undergo changes such as melting, ablation, cracking, and fuzz structures. Therefore there are high demands on plasmonic materials. [0003] At present, tungsten is considered as the most promising PFMs, which has t...

Claims

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Application Information

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IPC IPC(8): C22C1/05C22C1/10C22C27/04C22C32/00B22F9/22
Inventor 罗来马周宇芬吴玉程谭晓月刘东光昝祥朱晓勇
Owner HEFEI UNIV OF TECH
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