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Tungsten based composite material with granules of double carbide enhanced

A composite carbide and composite material technology, applied in the field of composite carbide particle reinforced tungsten-based composite materials, can solve the problems of low thermal conductivity, tungsten strength decline, etc.

Inactive Publication Date: 2003-10-01
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the strength of tungsten will decrease significantly with the increase of temperature, and in some special high-temperature environments, materials are required to have good high-temperature strength, ablation resistance, oxidation resistance and low thermal conductivity, so single metal tungsten components Difficult to apply in these environments

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Composite carbide 4TaC ZrC powder with a particle size of about 2 to 3 μm and a purity of more than 98% and tungsten powder with an average particle size of about 3.5 μm and a purity of more than 99% by volume: 4TaC HfC:W=30:70 Carry out dry mixing, add steel balls as ball milling medium. After mixing for 24 hours, the mixture was taken out, put into a graphite mold, and hot-pressed and sintered directly in a vacuum furnace to obtain a tungsten-based composite material with a volume fraction of composite carbide particles of 30%. The sintering process is: heat preservation at 2100°C for 1 hour, one-way hot pressing pressure of 20MPa, vacuum degree of 1.3×10 -2 Pa. The density of the composite material is 90-95%. The flexural strength tested by the three-point bending method at room temperature is about 700MPa, and the fracture toughness tested by the unilateral notched beam method is 9MPa m 1 / 2 , the three-point bending flexural strength of the composite at 1000 °C i...

Embodiment 2

[0013] Composite carbide 4TaC HfC with an average particle size of about 2-3 μm and a purity of 98% or more and tungsten powder with an average particle size of about 3.5 μm and a purity of 99% or more by volume: 4TaC HfC: W = 30:70 Carry out dry mixing, add steel balls as ball milling medium. After mixing for 24 hours, the mixture was taken out, put into a graphite mold, and hot-pressed and sintered directly in a vacuum furnace to obtain a tungsten-based composite material with a volume fraction of composite carbide particles of 30%. The sintering process is: heat preservation at 2100°C for 1 hour, one-way hot pressing pressure of 20MPa, vacuum degree of 1.3×10 -2 Pa. The density of the composite material is 90-95%. The flexural strength tested by the three-point bending method at room temperature is about 700MPa, and the fracture toughness tested by the unilateral notched beam method is 9MPa m 1 / 2 , the three-point bending flexural strength of the composite at 1000 °C is ...

Embodiment 3

[0015] Zirconium carbide and tantalum carbide powder with an average particle size of about 2-4 μm and a purity of more than 99% and tungsten powder with an average particle size of about 3.5 μm and a purity of more than 99% by volume: ZrC:TaC:W=20:10 :70 for wet mixing, adding zirconia balls as milling media, and ethanol as dispersant. After mixing for 10 hours, the mixture was taken out, put into graphite mold after drying, and directly hot-pressed and sintered in a vacuum furnace to obtain a tungsten-based composite material with a volume fraction of composite carbide particles of 30%. The sintering process is: heat preservation at 2000°C for 1.5 hours, one-way hot pressing pressure of 25MPa, vacuum degree of 1.3×10 -2 Pa. The density of the composite material is 90-95%. The flexural strength tested by the three-point bending method at room temperature is about 710MPa, and the fracture toughness tested by the unilateral notched beam method is 8MPa m 1 / 2 , the three-point...

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Abstract

A composite carbide particles reinforced W-base composition is prepared from composite carbide particles (10-60 vol.%) and W-base composition through sintering in H2, argon gas, N2, or vacuum at 1900-2300 deg.C. Said composite carbide may be chosen from 4Tac.Zrc, 4Tac.Hfc, TiC.NbC.TaC.HfC, and ZrC.NbC.TaC.HfC. Its advantages are high mechanical performance, and high resistance to oxidizing and ablation.

Description

Technical field: [0001] The invention proposes a composite carbide particle reinforced tungsten-based composite material. Background technique: [0002] More and more attention has been paid to metal matrix composites, and their reinforcements are generally particles, whiskers (or short fibers) and fibers. Metal matrix composites have higher specific strength, specific stiffness, and higher high temperature strength than their matrix alloys. Its preparation methods mainly include powder metallurgy sintering method (including pressureless sintering, hot pressing sintering and hot isostatic pressing sintering), casting method (including stirring casting, hot extrusion casting and injection molding, etc.). Metal matrix composites have been a hot research topic at home and abroad for more than 20 years. Their excellent mechanical properties and good thermophysical properties have prompted people to continuously develop new materials. For metal tungsten, it is widely used in hi...

Claims

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Application Information

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IPC IPC(8): C22C1/05C22C27/04C22C32/00
Inventor 周玉宋桂明王玉金
Owner HARBIN INST OF TECH
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