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Method of thermo press preparing high purity aluminium titanium carbide block material

A block material, aluminum-titanium carbide technology, applied in the field of ceramic block preparation, can solve the problems of furnace body and heating element corrosion and environmental pollution, and achieve the effect of easy stability of sintering process parameters, high purity, and cost reduction

Inactive Publication Date: 2008-02-27
BEIJING JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Even with the addition of B 2 o 3 , NaF and other low-melting-point compounds to reduce the degree of thermal explosion reaction, but the volatilization of low-melting-point components leads to corrosion and environmental pollution of the furnace body and heating parts

Method used

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  • Method of thermo press preparing high purity aluminium titanium carbide block material

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Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0020] 1) According to the molar ratio of Ti:Al:TiC:Sn=1:1:1:0.1, weigh 14.68 grams of Ti powder, 8.29 grams of Al powder, 18.38 grams of TiC powder, and 3.64 grams of Sn powder. 2) Put the above-mentioned ingredients and agate balls into a ball mill jar according to the ball-to-material ratio of 2:1, and mix for 5 hours. 3) Put the uniformly mixed ingredients into the graphite mold, place the graphite mold in a hot-press furnace, and raise the temperature of the furnace to 1350°C at a heating rate of 30°C / min under an argon protective atmosphere. A pressure of 20 MPa is applied to the powder, and the holding time is 40 minutes to obtain high-purity Ti 3 AlC 2 Dense bulk material. The X-ray diffraction (XRD) pattern of this material is shown in accompanying drawing 1. It can be seen from the figure that the product has high purity, and there is no impurity phase such as TiC in the XRD spectrum.

Embodiment approach 2

[0022] 1) According to the molar ratio of Ti:Al:TiC:Sn=1:1:1:0.15, weigh 14.12 grams of Ti powder, 7.97 grams of Al powder, 17.66 grams of TiC powder, and 5.25 grams of Sn powder. 2) Put the above-mentioned ingredients and agate balls into a ball mill jar according to the ball-to-material ratio of 2:1, and mix for 5 hours. 3) Put the uniformly mixed ingredients into the graphite mold, place the graphite mold in a hot-press furnace, and raise the temperature of the furnace to 1400°C at a rate of 40°C / min under an argon protective atmosphere, and at the same time heat the powder in the mold A pressure of 20MPa was applied to the material, and the holding time was 30 minutes to obtain high-purity Ti 3 AlC 2 Dense bulk material. Its XRD result is the same as Embodiment 1.

Embodiment approach 3

[0024] 1) According to the molar ratio of Ti:Al:TiC=1:0.9:1, weigh 16.29 grams of Ti powder, 8.26 grams of Al powder and 20.37 grams of TiC powder. 2) Put the above-mentioned ingredients and agate balls into a ball mill jar according to the ball-to-material ratio of 2:1, and mix for 8 hours. 3) Put the uniformly mixed ingredients into a graphite mold, place the graphite mold in a hot-press furnace, and raise the temperature of the furnace to 1500°C at a rate of 40°C / min under an argon protective atmosphere, while the powder in the mold is A pressure of 30MPa was applied to the material, and the holding time was 60 minutes to obtain high-purity Ti 3 AlC2 Dense bulk material. Its XRD result is the same as Embodiment 1.

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Abstract

The present invention relates to a method for preparing high-purity aluminium titanium carbide block material by utilizing hot-pressing process. Said method includes the following steps: using Ti powder, Al powder and TiC powder as raw material, using proper quantity of Sn as reaction adjuvant, mixing materials according to the mole ratio of Ti:Al:TiC:Sn=1:(0.9-1):1:(0-0.2), placing the mixed material and agate ball into a ball-grinding tank according to the ball material ratio of 2:1, dry mixing them for 5-10 h in ball-grinding machine, placing the uniformly-mixed material into a graphite mould, placing said graphite mould into a hot-pressing furnace, heating to 1350-1550 deg.C under the protection of argon atmosphere, at the same time applying pressure of 10-30 MPa then heat-insulating for 30-60 min so as to obtain the invented high-purity large-size Ti3AlC2 block material.

Description

technical field [0001] The invention relates to a preparation method of a ceramic block, in particular to a highly conductive aluminum carbide titanium Ti 3 AlC 2 A ceramic block and its hot-pressing preparation method. Background technique [0002] Aluminum Carbide Titanium Ti 3 AlC 2 It belongs to a new type of ternary layered compound. It combines the advantages of metal and ceramics, and integrates structure and function, such as high electrical conductivity, oxidation resistance, corrosion resistance, self-lubrication, and easy processing. This new type of ceramic can be widely used as a structural and functional material in aerospace, petrochemical, transportation, new energy, electronic information and other fields. If it is the preferred material for high-temperature structural parts, it is a new generation of motor brush materials and heat exchange materials. High-speed train pantograph slide materials, various anti-friction and wear-resistant parts, corrosion-...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/56C04B35/65
Inventor 李世波贝国平向卫华翟洪祥周洋
Owner BEIJING JIAOTONG UNIV
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