Ti2AlC/TiAl based composite material and low-temperature preparation method thereof

A composite material and low-temperature technology, which is applied in the field of material science and engineering, can solve the problems of high energy consumption required for production, increased production costs, and high equipment requirements, so as to improve bending strength and fracture toughness, and the effect of strengthening and toughening is obvious. low cost effect

Inactive Publication Date: 2014-04-30
SHAANXI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above method mainly produces Ti through the chemical synthesis reaction between the various components in the raw material. 2 AlC, and many processes often require follow-up high-temperature heat treatment and other processes, the cycle is long, the process is complex, the equipment requirements are high, the sintering temperature is high (>1100 ° C, if the temperature is low, there will be TiC impurity phase), the energy consumption required for production is large, and the increase preparation cost

Method used

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  • Ti2AlC/TiAl based composite material and low-temperature preparation method thereof
  • Ti2AlC/TiAl based composite material and low-temperature preparation method thereof
  • Ti2AlC/TiAl based composite material and low-temperature preparation method thereof

Examples

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Effect test

Embodiment 1

[0032] Step 1: Put 23.94% of Ti powder, 16.19% of Al and 59.87% of TiC powder into a stainless steel ball mill tank by mass fraction, add 400mL absolute ethanol as the ball mill medium, stainless steel balls as the ball mill, and the ball mill speed is 750 rpm, the ratio of ball to material is 7:1, after ball milling for 2 hours, obtain a uniform powder and dry it at a drying temperature of 50°C, then put the dried mixed powder into a corundum crucible for vacuum pressure-free Sintering, from room temperature to sintering temperature at a heating rate of 10 °C / min, the sintering temperature is 1350 °C, kept at 1350 °C for 2 hours, and then naturally cooled to room temperature with the furnace to obtain Ti 3 AlC 2 Powder.

[0033] Step 2, by mass fraction, the Ti powder prepared by 64.46% Ti powder, 33.54% Al powder and 2% step 1 3 AlC 2 The powder is put into a stainless steel ball mill tank, and ball milled on a planetary ball mill. Add 200mL of absolute ethanol as the bal...

Embodiment 2

[0040] Step 1: Put 23.94% of Ti powder, 16.19% of Al and 59.87% of TiC powder into a stainless steel ball mill tank by mass fraction, add 400mL absolute ethanol as the ball mill medium, stainless steel balls as the ball mill, and the ball mill speed is 750 rpm, the ratio of ball to material is 7:1, after ball milling for 2 hours, obtain a uniform powder and dry it at a drying temperature of 50°C, then put the dried mixed powder into a corundum crucible for vacuum pressure-free Sintering, from room temperature to sintering temperature at a heating rate of 10 °C / min, the sintering temperature is 1350 °C, kept at 1350 °C for 2 hours, and then naturally cooled to room temperature with the furnace to obtain Ti 3 AlC 2 Powder.

[0041] Step 2, by mass fraction, the Ti powder prepared by 62.49% Ti powder, 32.51% Al powder and 5% step 1 3 AlC 2 The powder is put into a stainless steel ball mill tank, and ball milled on a planetary ball mill. Add 200mL of absolute ethanol as the bal...

Embodiment 3

[0045] Step 1: Put 23.94% of Ti powder, 16.19% of Al and 59.87% of TiC powder into a stainless steel ball mill tank by mass fraction, add 400mL absolute ethanol as the ball mill medium, stainless steel balls as the ball mill, and the ball mill speed is 750 rpm, the ratio of ball to material is 7:1, after ball milling for 2 hours, obtain a uniform powder and dry it at a drying temperature of 50°C, then put the dried mixed powder into a corundum crucible for vacuum pressure-free Sintering, from room temperature to sintering temperature at a heating rate of 10 °C / min, the sintering temperature is 1350 °C, kept at 1350 °C for 2 hours, and then naturally cooled to room temperature with the furnace to obtain Ti 3 AlC 2 Powder.

[0046] Step 2, by mass fraction, the Ti powder prepared by 59.2% Ti powder, 30.8% Al powder and 10% step 13 AlC 2 The powder is put into a stainless steel ball mill tank, and ball milled on a planetary ball mill. Add 200mL of absolute ethanol as the ball m...

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Abstract

The invention discloses a Ti2AlC / TiAl based composite material and a low-temperature preparation method thereof. The Ti2AlC / TiAl based composite material is prepared by steps of uniformly ball-milling Ti powder, Al powder and Ti3AlC2 powder, then performing cold press molding firstly, and finally performing vacuum hot pressing and sintering at 950-1,050 DEG C. The material consists of two parts, namely, base phase TiAl, Ti3Al and enhancing phase Ti2AlC, without impurity phase TiC. The base phase is formed through in-situ exothermic reaction between Ti and Al, Ti3AlC2 has a self-decomposition reaction to obtain the Ti2AlC enhancing phase, the synthesis temperature of the Ti2AlC / TiAl based composite material is reduced, the material is simple in process, high in controllability, low in sintering temperature, low in preparation cost, high in product purity, low in impurity content and remarkable in toughening effect, the maximum bending strength of the prepared material is 651MPa, and the maximum breaking tenacity is 10.89MPa.m<1 / 2>.

Description

technical field [0001] The invention belongs to the field of material science and engineering, in particular to a Ti 2 AlC / TiAl-based composite material and its low-temperature preparation method. Background technique [0002] Due to the long-range ordered arrangement of TiAl atoms and the coexistence of metal bonds and covalent bonds between atoms, TiAl intermetallic compounds may take into account both the plasticity of metals and the high-temperature strength of ceramics. That is, it has high specific strength, specific stiffness, specific modulus, and good resistance to high temperature oxidation, creep resistance and hydrogen embrittlement, which are not found in general metals and alloys. The comprehensive performance index is better than cobalt-based, nickel-based and other high-temperature alloys, and the toughness is higher than that of ordinary ceramics. It is expected to be used in jet engines and turbines and other aerospace, high-temperature resistant parts of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/05C22C14/00C22C32/00
Inventor 艾桃桃冯小明阮苗苗徐峰
Owner SHAANXI UNIV OF TECH
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