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Method for improving high-temperature mechanical property and high-temperature oxidation resistance of titanium silicon carbon

A technology of high temperature oxidation resistance and high temperature mechanics, applied in chemical instruments and methods, layered products, ceramic layered products, etc., can solve the problems of poor oxidation resistance, no improvement in high temperature mechanical properties, and reduced mechanical properties. , to achieve the effect of maintaining high temperature strength, increasing the temperature, improving high temperature mechanical properties and high temperature oxidation resistance, and the method is simple

Inactive Publication Date: 2012-07-11
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the decrease in mechanical properties and poor oxidation resistance above 1100 °C limit its wide application in high temperature fields.
Preparation of Ti 3 SiC 2 / SiC composites, or in Ti 3 SiC 2 Si or Al infiltration on the surface, or preparation of Ti 3 (Si 0.9 Al 0.1 )C 2 The solid solution material improves the Ti 3 SiC 2 Oxidation resistance, but its high temperature mechanical properties have not been improved

Method used

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  • Method for improving high-temperature mechanical property and high-temperature oxidation resistance of titanium silicon carbon
  • Method for improving high-temperature mechanical property and high-temperature oxidation resistance of titanium silicon carbon
  • Method for improving high-temperature mechanical property and high-temperature oxidation resistance of titanium silicon carbon

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Experimental program
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Effect test

Embodiment 1

[0031] Select ternary layered ceramic titanium silicon carbon solid solution material (Ti 0.98 Nb 0.02 ) 3 (Si 0.95 al 0.05 )C 2 As the experimental material, its preparation process is as follows:

[0032] Use Ti powder, Nb powder, Si powder, Al powder and graphite powder as synthetic materials, configure the raw material powder according to the stoichiometric ratio of the materials, put the prepared raw material powder into the mixing tank, ball mill for 15 hours, and then take it out and sieve Standby; after being cold-pressed in a graphite mold with a pressure of 5 MPa for 5 minutes into a cake shape, put it into a hot-press furnace for reaction and hot-press synthesis. The process used for hot-pressing synthesis is: under the pressure of 30MPa, the temperature is raised to the predetermined temperature at 15°C / min, and the temperature is kept at 1550°C for 60 minutes. The reaction is carried out under the flowing Ar gas as the protective gas.

[0033] figure 1 In o...

Embodiment 2

[0044] Select ternary layered ceramic titanium silicon carbon solid solution material (Ti 0.97 Nb 0.03 ) 3 (Si 0.95 al 0.05 )C 2 As the experimental material, its preparation process is as follows:

[0045]Ti powder, Nb powder, Si powder, Al powder and graphite powder are used as synthetic materials, and the raw powder is configured according to the stoichiometric ratio of the materials. The prepared raw material powder is put into the mixing tank, ball milled for 24 hours, and then taken out. Sieve for standby; after cold pressing in graphite mold with a pressure of 8 MPa for 5 minutes into a cake shape, put it into a hot-press furnace for reaction and hot-press synthesis. The process used for hot-pressing synthesis is: under the pressure of 30MPa, the temperature is raised to the predetermined temperature at 10°C / min, kept at 1580°C for 10 minutes, and then kept at 1400°C for 60 minutes. The reaction is carried out under the protective gas of flowing Ar gas of.

[004...

Embodiment 3

[0048] Select ternary layered ceramic titanium silicon carbon solid solution material (Ti 0.95 Nb 0.05 ) 3 (Si 0.95 Al 0.05 )C 2 As the experimental material, its preparation process is as follows:

[0049] Ti powder, Nb powder, Si powder, Al powder and graphite powder are used as synthetic materials, and the raw powder is configured according to the stoichiometric ratio of the materials. The prepared raw material powder is put into the mixing tank, ball milled for 30 hours, and then taken out. Sieve for standby; after cold pressing in a graphite mold with a pressure of 9 MPa for 5 minutes into a cake shape, put it into a hot-press furnace for reaction and hot-press synthesis. The process used for hot-pressing synthesis is: under the pressure of 30MPa, the temperature is raised to the predetermined temperature at 15°C / min, kept at 1600°C for 15 minutes, and then kept at 1400°C for 60 minutes. The reaction is carried out under the protective gas of flowing Ar gas of.

[...

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Abstract

The invention relates to the field of a ternary laminated ceramic titanium silicon carbon material, in particular to a method for improving high-temperature mechanical property and high-temperature oxidation resistance of titanium silicon carbon. The method improves high-temperature mechanical property and high-temperature oxidation resistance by preparing titanium silicon carbon material containing Nb solid solute produced by in situ reaction, wherein the titanium silicon carbon is a ternary laminated ceramic Ti3SiC2 or Ti3(SiAl)C2 containing solid solute Al; the titanium silicon carbon containing Nb solid solute is prepared by containing solid solutie Nb on Ti positions. 0-10at.% of solid solute Nb exists on the Ti position so as to form (Ti1-xNbx)3SiC2 or (Ti1-xNbx)3(SiAl)C2 solid solution material, wherein x is 0-0.1. is the experimental results show that compared with the titanium silicon carbon material, the maintaining temperature of the high-temperature strength of the Nb-doped titanium silicon carbon solid solution material is improved by about 150 DEG C; the oxidation kinetics of the solid solution material at 1000-1300 DEG C follows a parabola rule; under a same oxidization condition, the oxidization rate constant is reduced to 1-2 orders of magnitude, so that the using temperature range of the titanium silicon carbon material is enlarged.

Description

technical field [0001] The invention relates to the field of ternary layered ceramic titanium-silicon-carbon materials, in particular to a method for improving high-temperature structural ceramic-titanium-silicon-carbon high-temperature mechanical properties and high-temperature oxidation resistance. Background technique [0002] The ternary layered ceramic titanium silicon carbon material is a member of the family of MAX phase ceramics (M refers to transition group metals, A refers to A main group elements, and X refers to C or N elements). It has a layered structure and has both the advantages of metals and ceramics, such as low density, high modulus, high strength, high thermal conductivity, high electrical conductivity, easy processing, good oxidation resistance and thermal shock resistance below 1100 °C . However, the decrease in mechanical properties and poor oxidation resistance above 1100 °C limit its wide application in high temperature fields. Preparation of Ti ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/58C04B35/622B32B18/00
Inventor 李美栓郑莉莉周延春
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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