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Method for preparing nano oxide dispersion reinforced superfine crystal tungsten-based composite material

A nano-oxide and dispersion-enhanced technology, which is applied in the field of high-melting point metals and metal-based heat sink materials, can solve the problems of difficult-to-obtain performance tungsten-based composite materials, and achieve good electron beam impact resistance, good mechanical properties, and crystal grains. The effect of fine and uniform tissue

Inactive Publication Date: 2010-11-10
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Even with new nanomaterial sintering technologies, such as hot isostatic pressing and spark plasma sintering, it is difficult to obtain tungsten-based composite materials with excellent performance if the growth process of tungsten grains is not inhibited during sintering.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Example 1: Ultrafine Grain W-Y 2 o 3 Preparation of composite materials.

[0020] press Y 2 o 3 The mass fraction is 0.5wt% mass ratio to take by weighing W powder and nanometer Y 2 o 3 The powder was put into a WC ball mill jar, and mechanically alloyed in a WC cemented carbide ball mill jar at a ball-to-material ratio of 5:1. The mill speed was 380r / min and the high-energy ball mill was milled for 30 hours. Then put the mechanically alloyed powder in a glove box filled with Ar gas, take out the tungsten powder and fill it in a graphite mold with a diameter of 20mm. The above-mentioned whole operation process is completed under the protective atmosphere of argon (99.99%). Discharge plasma sintering at 1700°C, 50MPa pressure, and 6Pa vacuum for 1min. After the obtained sample is ground and polished, the measured density is 18.38g / cm 3 , the micro-Vickers hardness is 476.5HV, the flexural strength is 994.5MPa, and the grain size is 3μm.

Embodiment 2

[0021] Example 2: ultrafine grain W-Y 2 o 3 - Preparation of Ti composites.

[0022] press Y 2 o 3 The mass fraction of Ti and Ti is 0.35wt%, and the mass proportion of 0.5wt% takes W powder, nanometer Y 2 o 3 Powder and Ti powder were put into a WC ball milling jar, and mechanically alloyed in a WC cemented carbide ball milling jar according to the ball-to-material ratio of 5:1. Then put the mechanically alloyed powder in a glove box filled with Ar gas, take out the tungsten powder and fill it in a graphite mold with a diameter of 20mm. The above-mentioned whole operation process is completed under the protective atmosphere of argon (99.99%). Discharge plasma sintering at 1700°C, 50MPa pressure, and 6Pa vacuum for 2min. After the obtained sample is ground and polished, the measured density is 18.25g / cm 3 , the micro-Vickers hardness is 1023.0HV, the flexural strength is 1054.9MPa, and the grain size is 0.2μm.

Embodiment 3

[0023] Example 3: Ultrafine Grain W-Y 2 o 3 - Preparation of Ti composites.

[0024] press Y 2 o 3 The mass fraction of Ti and Ti is 0.5wt%, and the mass proportion of 1.5wt% takes W powder, nanometer Y 2 o 3Powder and Ti powder were put into a WC ball milling jar, and mechanically alloyed in a WC cemented carbide ball milling jar at a ball-to-material ratio of 5:1. Then put the mechanically alloyed powder in a glove box filled with Ar gas, take out the tungsten powder and fill it in a graphite mold with a diameter of 20mm. The above-mentioned whole operation process is completed under the protective atmosphere of argon (99.99%). Discharge plasma sintering at 1700°C, 50MPa pressure, and 6Pa vacuum for 1min. After the obtained sample is ground and polished, the measured density is 18.2g / cm 3 , the micro-Vickers hardness is 794.9HV, the flexural strength is 892.9MPa, and the grain size is 0.4μm.

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Abstract

The invention provides a method for preparing a nano oxide dispersion reinforced superfine crystal tungsten-based composite material. The method comprises the following steps of: taking 0.1 to 1 weight percent of micro tungsten powder, nano yttrium oxide powder or yttrium metal powder and 0 to 2 weight percent of titanium metal powder or molybdenum powder or tantalum powder, blending the materials, mechanically alloying the materials, sintering discharge plasma and the like to prepare the superfine crystal tungsten composite material. The method has the following advantage that: the nearly full-densification superfine crystal tungsten-based composite material can be obtained by the method for preparing the nano oxide dispersion reinforced superfine crystal tungsten-based composite material. Complex phase doping of yttrium oxide or yttrium metal and titanium metal, molybdenum or tantalum powder not only realizes sintering densification of tungsten at a lower temperature, but also inhibits grain growth of tungsten crystals during sintering. The tungsten crystal grain size of the yttrium oxide reinforced superfine crystal tungsten-based composite material prepared by adopting the method is less than or equal to 3 microns, and the composite material has good mechanical property and thermal shock resistance.

Description

technical field [0001] The invention relates to the technical field of high-melting point metals and metal-based heat sink materials, belongs to powder metallurgy technology, and specifically proposes a preparation method of nano-oxide dispersion-reinforced ultrafine-crystalline tungsten-based composite materials. Background technique [0002] The tungsten-based composite material involved in the invention is a nano-yttrium oxide particle-reinforced ultra-fine-grained tungsten-based composite material. Tungsten and tungsten alloys have the advantages of high melting point, high density, high strength, high hardness, low thermal expansion coefficient, excellent corrosion resistance and good thermal conductivity, so they are widely used in aerospace, electronics, chemical industry, military weapons, etc. field. For example, it is used as cutting tools, welding electrodes, spraying raw materials, lamp filaments, electron tube cathodes, high temperature resistance furnace heati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C27/04C22C1/05
Inventor 周张健谈军屈丹丹
Owner UNIV OF SCI & TECH BEIJING
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