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Method for preparing tantalum-aluminium-carbon ceramic by in-situ heat-pressing/solid-liquid phase reaction

A liquid phase reaction, solid-liquid phase technology, applied in the field of preparation of machinable layered ceramics, can solve the problems of no research performance, no bulk materials, etc.

Inactive Publication Date: 2009-07-29
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Document 1 (Z.Metallkd. (German Journal of Metals) 71, 341 (1980)) studied the phase equilibrium relationship of the Ta-Al-C system at 700°C and 1000°C. They found that Ta 2 AlC and Ta 5 al 3 C two kinds of ternary carbides, but could not get pure Ta 2 AlC, and its related properties have not been studied
To date, there are no reports on bulk materials

Method used

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  • Method for preparing tantalum-aluminium-carbon ceramic by in-situ heat-pressing/solid-liquid phase reaction
  • Method for preparing tantalum-aluminium-carbon ceramic by in-situ heat-pressing/solid-liquid phase reaction
  • Method for preparing tantalum-aluminium-carbon ceramic by in-situ heat-pressing/solid-liquid phase reaction

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] 180.95 grams of Ta powder, 13.49 grams of Al powder and 9.00 grams of C powder were ball-milled for 8 hours, cold-pressed into a cake under a pressure of 15 MPa, packed into a graphite mould, and passed through an inert gas (argon) as a heat shielding gas. In the press furnace, the temperature was raised to 1530°C at a rate of 10°C / min for in-situ hot pressing / solid-liquid phase reaction for 0.5 hours, and the hot pressing pressure was 30MPa. The main reaction product obtained was analyzed by X-ray diffraction as Ta 4 AlC 3 . The corresponding X-ray diffraction patterns, scanning electron micrographs, and transmission electron micrographs are listed in the attached Figure 1-3 superior.

Embodiment 2

[0024] 180.95 grams of Ta powder, 14.84 grams of Al powder and 6.00 grams of C powder were ball milled for 12 hours, cold-pressed into a cake under a pressure of 10 MPa, packed into a graphite mold, and heated in a hot-press furnace with argon as a protective gas. The heating rate of 20°C / min was increased to 1450°C in situ hot pressing / solid-liquid phase reaction for 1 hour, and the hot pressing pressure was 35MPa. The main reaction product obtained was analyzed by X-ray diffraction as Ta 4 AlC 3 and Ta 2 Two-phase composites of AlC. The corresponding X-ray diffraction patterns are listed in the attached Figure 4 superior.

Embodiment 3

[0026] 180.95 grams of Ta powder, 20.24 grams of Al powder and 6.00 grams of C powder were ball-milled for 12 hours, cold-pressed into a cake under a pressure of 20 MPa, packed into a graphite mould, and vacuumed (vacuum degree is 10 -2 Pa) in a hot-press furnace at a rate of 10°C / min to 1350°C in situ hot-pressing / solid-liquid phase reaction for 2 hours, and the hot-pressing pressure is 40MPa. The main reaction product obtained was analyzed by X-ray diffraction as Ta 2 AlC. The corresponding transmission electron microscope pictures are attached Figure 5 superior.

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Abstract

The invention relates to the preparation technology of machinable layered ceramics, and in particular provides a method for preparing tantalum-aluminum-carbon (Ta4AlC3, Ta2AlC and two-phase composite) ceramic block materials by in-situ hot pressing / solid-liquid phase reaction, which is characterized in that : Ta powder with a certain stoichiometric ratio, Al powder and C powder are used as raw materials, and the raw materials are cold-pressed into cakes with a pressure of 10-20MPa through ball milling for 5-15 hours, packed into a graphite mold, and passed through an inert gas ( Such as argon) as a protective gas (or under vacuum) in a hot-press furnace heated to 1100-1600°C at a heating rate of 2-50°C / min. In-situ hot pressing / solid-liquid phase reaction for 0.5-4 hours, heat The compression pressure is 20-40MPa. The present invention can synthesize high-purity, high-strength, and corrosion-resistant tantalum-aluminum-carbon block materials at relatively low temperatures in a short period of time; the ambient temperature of the materials obtained by the method of the present invention can range from room temperature to ultra-high temperatures greater than 1000°C. Use at high temperatures.

Description

technical field [0001] The invention relates to the preparation technology of machinable layered ceramics, and in particular provides an in-situ hot pressing / solid-liquid phase reaction for preparing tantalum aluminum carbon (Ta 4 AlC 3 , Ta 2 AlC and two-phase composite) methods for ceramic bulk materials. Background technique [0002] Tantalum aluminum carbon (Ta 4 AlC 3 , Ta 2 AlC and two-phase composite) bulk material is a new type of ternary layered material. It combines many advantages of ceramics and metals, and has high modulus of ceramics (such as Ta 4 AlC 3 259GPa), anti-oxidation, corrosion resistance, etc.; at the same time, it has the properties of metal materials, high electrical conductivity, thermal conductivity, strong damage tolerance, etc. It has potential wide application prospects in high-tech fields such as aviation, aerospace, nuclear industry, fuel cells, electronic information, and ultra-high temperature structural parts. Although tantalum a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/56C04B35/622C04B35/645
Inventor 周延春林志军李美栓王京阳胡春峰
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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