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Method of preparing high pruity block titanium aluminium carbon material using discharge plasma sintering

A technology of discharge plasma and titanium aluminum carbon, which is applied in the field of ceramic material preparation, can solve problems that have not been reported, and achieve the effects of avoiding the formation of TiC impurities, high purity, and short sintering time

Inactive Publication Date: 2004-03-03
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, on the preparation of high-purity bulk Ti by spark plasma sintering technology 3 AlC 2 The technology of the material has not been reported

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Select pre-synthesized Ti 3 AlC 2 Powder is the raw material, where Ti 3 AlC 2 The content is about 85%, Ti 2 The AlC content is about 9%, and the TiC content is about 6%. Pass the powder through a 100-mesh sieve, and then put it into a square graphite mold. The size of the graphite mold is 35mm x 35mm. Then put the graphite mold into the SPS equipment, evacuate, apply a pressure of 22MPa, and start sintering. The heating rate is 800°C / min, the sintering temperature is 1250°C, and the temperature is kept for 5 minutes. Then turn off the power and cool down naturally. After testing, the composition of the sample is: Ti 3 AlC 2 95%, Ti 2 AlC 4%, TiC 1%. The mechanical properties of the sample are: fracture toughness 9.2MPa m 1 / 2 , Bending strength 550MPa.

Embodiment 2

[0022] Select pre-synthesized Ti 3 AlC 2 Powder is the raw material, where Ti 3 AlC 2 The content is about 80%, Ti 2 The AlC content is about 13%, and the TiC content is about 7%. Pass the powder through a 100-mesh sieve, and then put it into a square graphite mold. The size of the graphite mold is 35mm x 35mm. Then put the graphite mold into the SPS equipment, evacuate, apply a pressure of 25MPa, and start sintering. The heating rate is 600°C / min, the sintering temperature is 1300°C, and the temperature is kept for 5 minutes. Then turn off the power and cool down naturally. After testing, the composition of the sample is: Ti 3 AlC 2 94%, Ti 2 AlC 3%, TiC 3%. The mechanical properties of the sample are: fracture toughness 9.9MPa m 1 / 2 , Bending strength 600MPa.

Embodiment 3

[0024] Choose Ti powder, Al 4 C 3 The mixture of powder and activated carbon powder is the raw material. Raw material composition: Ti powder 74%, Al 4 C 3 22. Activated carbon powder 4%. Put the raw materials into a ball mill jar, use agate balls as grinding balls, and use alcohol as the medium, and ball mill and mix the materials for 12 hours (material: ball: alcohol = 1:2:1). After discharge, vacuum filter, dry at about 80°C, pass through a 100-mesh sieve, and then put it into a square graphite mold. The size of the graphite mold is 35mm x 35mm. Then put the graphite mold into the SPS equipment, evacuate, apply a pressure of 20MPa, and start sintering. The heating rate is 700°C / min, the sintering temperature is 1250°C, and the temperature is kept for 5 minutes. Then turn off the power and cool down naturally. After testing, the composition of the sample is: Ti 3 AlC 2 91%, Ti 2 AlC 5%, TiC 4%. The mechanical properties of the sample are: fracture toughness 8.8M...

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Abstract

A process for preparing high-purity Ti-Al-C block by discharge plasma sintering includes such steps as proportionally mixing Ti3AlC2 powder or Ti powder, Al4C3 powder and active carbon powder, ball grinding, baking sieving, loading in graphite mould, discharging plasma sinter under protection of inertial gas, holding the temp for a certain time and cooling. Its advantages are high purity (90% or more) and high mechanical performance.

Description

technical field [0001] The invention relates to a method of preparing high-purity block titanium aluminum carbon (Ti 3 AlC 2 ) material, and belongs to the technical field of ceramic material preparation. Background technique [0002] Titanium Aluminum Carbon (Ti 3 AlC 2 ) is a new material with unique properties. This material combines the advantages of metal and ceramics, such as electrical conductivity, heat conduction, machinability, high temperature resistance, thermal shock resistance, self-lubrication and other very unique comprehensive properties. There are very broad application prospects in many fields. [0003] Currently preparing Ti 3 AlC 2 There are two main methods of materials: hot isostatic pressing sintering (document 1: J.Am.Ceram.Soc., 2000, 83:825-832) and in-situ hot pressing sintering (document 2: J.Mater.Chem. , 2002, 12: 455-460). These two methods are to use the method of reaction sintering directly from Ti, Al (or Al 4 C 3 ) and C as raw ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/515C04B35/622C04B35/64
Inventor 汪长安周爱国黄勇赵世柯
Owner TSINGHUA UNIV
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