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Method of preparing compact Ti3AlC2 ceramic by low-temperature non-pressure sintering

A ceramic and low-temperature technology, which is applied in the field of preparation of special ceramic materials, can solve the problems of high sintering temperature, high preparation cost, and long sintering time, and achieve the effect of simple process, low price and low cost of products

Inactive Publication Date: 2007-09-12
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the invention is to overcome Ti in the prior art 3 AlC 2 Due to the shortcomings of ceramic materials such as high sintering temperature, long sintering time, complicated process and high preparation cost, Ti 3 AlC 2 Low temperature pressureless sintering of ceramic materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Weigh 6.9434g of Ti powder with a purity of 99.99%, 1.6954g of Al powder with a purity of 99.99%, and 1.1611g of C powder with a purity of 99.99% according to a molar ratio of 3:1.3:2; 0.3mol of sintering aid has been included in the Al powder; Carbide balls are used, and the ball-to-material ratio is 30:1; the balls and batch materials are put into a ball mill jar, and argon inert gas is filled after vacuumizing; the speed of the high-energy ball mill is 300rpm; ball milling at room temperature for 30 hours, to obtain Mix uniform nanometer ultrafine powder. The ultra-fine powder was ball-milled again in ethanol medium for 3 hours; then dried, and PVB binder was added for granulation treatment; the granulated powder was poured into a steel mold, and pre-compressed under a pressure of 50MPa. Then, under the pressure of 100MPa, it is pressed into a green body on a cold isostatic press. After debinding, the green body is put into a high-temperature furnace, and sintered un...

Embodiment 2

[0021] Weigh 6.9434g of Ti powder with a purity of 99.99%, 2.0822g of Al powder with a purity of 99.99%, and 1.1611g of C powder with a purity of 99.99% according to a molar ratio of 3:1.6:2; 0.6mol of sintering aid has been included in the Al powder; Carbide balls are used, and the ball-to-material ratio is 20:1; the balls and batch materials are put into the ball mill jar, and argon inert gas is filled after vacuumizing; the speed of the high-energy ball mill is 250rpm; ball milling at room temperature for 60 hours, to obtain Mix uniform nanometer ultrafine powder. The ultra-fine powder was ball-milled again in ethanol medium for 3 hours; then dried, and PVB binder was added for granulation treatment; the granulated powder was poured into a steel mold, and pre-compressed under a pressure of 50MPa. Then, under the pressure of 100MPa, it is pressed into a green body on a cold isostatic press. The green body is put into a high-temperature furnace after debinding, and sintered u...

Embodiment 3

[0023] Weigh 6.9434g of Ti powder with a purity of 99.99%, 1.3014g of Al powder with a purity of 99.99%, and 1.1611g of C powder with a purity of 99.99% in a molar ratio of 3:1:2; then add 0.4049g of Si powder with a purity of 99.99% as a sintering aid agent; use cemented carbide balls, the ball-to-material ratio is 30:1; put the balls and batch materials into the ball mill tank, and fill it with argon inert gas after vacuuming; the speed of the high-energy ball mill is 300rpm; ball mill at room temperature for 30 hours , to get uniformly mixed nanometer ultrafine powder. The ultra-fine powder was ball-milled again in ethanol medium for 3 hours; then dried, and PVB binder was added for granulation treatment; the granulated powder was poured into a steel mold, and pre-compressed under a pressure of 50MPa. Then, under the pressure of 100MPa, it is pressed into a green body on a cold isostatic press. After debinding, the green body is put into a high-temperature furnace, and sint...

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Abstract

This invention relates to a low temperature pressless sintering preparation method for TiAL carbide ceramic, which takes pure Ti, Al and C as the raw materials to weigh and mix them in the mol ration of 3:1:2, then takes the mol volume of Al as the primary standard to add Sn, Si or Al powder of 0.3-0.6mol as the sinter aids, putting the mixed material in a ball mill kettle to be milled for 10-60h, in which, stainless steel balls or horniness alloy balls are applied in the kettle, the weight ratio of the ball material is 10:1-30:1, Ar or N inert gas is filled to the vacuumed kettle and the rate of the ball mill is 200-350rpm to get nanometer level super fine powder then to be ball-milled in ethanol medium for 3h to be dried and added with suitable PVB adhesive to granulate the powder and put into a steel model and pressed to an ingot on a cold equal static press to be sintered in vacuum, Ar or N protection atmosphere for 2-6h under 1250-1500deg.C to get a densed Ti3AlC2 ceramic.

Description

technical field [0001] The invention relates to a low-temperature pressureless sintering preparation method of titanium-aluminum carbide ceramics, which belongs to the technical field of special ceramic material preparation technology. Background technique [0002] Titanium aluminum carbide ceramics is a new type of ternary carbide material, which combines the advantages of metal and ceramics, with high thermal conductivity, high electrical conductivity, thermal shock resistance, self-lubricating, machinable, excellent high temperature strength And toughness, excellent chemical stability and high temperature oxidation corrosion resistance and other properties. This new material has attracted great attention and great research interest from researchers, and it can be used as current-receiving friction parts, conductive ceramic parts, corrosion-resistant parts, etc. [0003] In 1994, Pietzka and Schuster (J.Phase Equilib, 1994[15]: 392) calcined Ti powder, TiAl powder, Al 4 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/64C04B35/626C04B35/634C04B35/56
Inventor 朱丽慧黄清伟
Owner SHANGHAI UNIV
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