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Pressureless sintering preparation method of Ti2SC ceramic

A ceramic and microwave sintering technology, which is applied in the field of preparation of ternary layered compound ceramics, can solve the problem of high synthesis temperature, and achieve the effects of short preparation time, convenient operation and improved efficiency

Inactive Publication Date: 2014-08-27
HENAN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be seen that the current synthesis of Ti 2 The method of SC bulk material is mainly the method of hot pressing sintering, the synthesis temperature of this method is high (high temperature of nearly 1600°C), and the synthesis time is very long and takes several hours
Moreover, there are certain limitations in size and shape

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Will Ti 2 SC ceramic powder and polyvinyl alcohol PVA are mixed uniformly at a mass ratio of 100:0.5, and then put into a mold to preform at 1 MPa, and hold the pressure for 2 minutes. Ti after preforming 2 The SC ceramic is loaded into the rubber mold and processed by cold isostatic pressing at a pressure of 100MPa. Ti after cold isostatic pressing 2 SC ceramic is heated to 800°C under the protection of inert gas and sintered for 20 minutes to obtain Ti 2 SC ceramic block.

[0016] Using the above process to finally obtain Ti with a density of 75% 2 SC ceramic block.

Embodiment 2

[0018] Will Ti 2 SC ceramic powder and polyvinyl alcohol PVA are mixed uniformly at a mass ratio of 100:2, and then put into a mold to preform at 5MPa, and hold the pressure for 5 minutes. Ti after preforming 2 The SC ceramic is loaded into the rubber mold and processed by cold isostatic pressing at a pressure of 150 MPa. Ti after cold isostatic pressing 2 SC ceramic is heated to 900°C under the protection of inert gas and sintered for 40 minutes to obtain Ti 2 SC ceramic block.

[0019] Using the above process to finally obtain 88% dense Ti 2 SC ceramic block.

Embodiment 3

[0021] Will Ti 2 SC ceramic powder and polyvinyl alcohol PVA are mixed uniformly at a mass ratio of 100:5, and then put into a mold to preform at 6MPa, and hold the pressure for 5 minutes. Ti after preforming 2 The SC ceramic is loaded into the rubber mold and processed by cold isostatic pressing at a pressure of 280MPa. Ti after cold isostatic pressing 2 SC ceramics are heated to 1100°C in microwave under the protection of inert gas and sintered for 60 minutes to obtain Ti 2 SC ceramic block.

[0022] Using the above process, Ti with a density of 98% is finally obtained 2 SC ceramic block.

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Abstract

A pressureless sintering preparation method of Ti2SC ceramic is characterized by comprising the following steps: (1) evenly mixing Ti2SC ceramic powder with polyvinyl alcohol PVA, and then filling into a die for preforming; (2) performing cold isostatic pressing treatment on the preformed Ti2SC ceramic; (3) putting the cold isostatic pressing treated Ti2SC ceramic into a microwave sintering furnace filled with inert gas protective atmosphere for sintering for 20-60 minutes at 800-1100 DEG C to obtain the Ti2SC bulk ceramic; the preparation method not only improves the density of the ceramic material, realizes the controllable density of the Ti2SC ceramic material, can prepare Ti2SC ceramic materials with complex shapes, and has the advantages of low sintering temperature, short time, saving energy and the like.

Description

technical field [0001] The invention provides a method for preparing ternary layered compound ceramics, in particular to a pressureless sintering process for preparing Ti 2 SC ceramic block material. Background technique [0002] Ti 2 SC is M n+1 AX n (n=1,2,3) A member of the "211" phase family in ternary layered compounds, it belongs to the hexagonal crystal system, it has excellent high thermal conductivity and high electrical conductivity similar to metals, and has better corrosion resistance performance. At the same time Ti 2 SC also has the high strength of ceramics and good high temperature oxidation resistance. Therefore, Ti 2 As a high-temperature anti-oxidation and corrosion-resistant ceramic component and protective coating, SC has broad application prospects in aerospace, nuclear industry, transportation, petrochemical and metallurgy and other fields. In the whole MAX phase family Ti 2 SC has the characteristic of the smallest lattice constant c, which m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/547C04B35/622
Inventor 关春龙卢新坡马秋花李金玲毕豫王海阔何伟春陈艳
Owner HENAN UNIVERSITY OF TECHNOLOGY
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