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Ti2AlC/TiAl-based composite and preparation method thereof

A composite material and matrix phase technology, applied in the field of materials science and engineering, can solve the problems of difficult process control, high energy consumption required for production, and increased production cost, and achieve improved bending strength and fracture toughness, and small grain size. , the interface is clean

Inactive Publication Date: 2015-09-16
SHAANXI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above method and preparation system have strong heat release during the reaction process, difficult process control, and often require subsequent heat treatment and densification processes, which have a long cycle and require large energy consumption for production, which increases the production cost.

Method used

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  • Ti2AlC/TiAl-based composite and preparation method thereof
  • Ti2AlC/TiAl-based composite and preparation method thereof
  • Ti2AlC/TiAl-based composite and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Step 1. Put 65.78% of Ti powder and 34.22% of Al powder into a stainless steel ball milling tank by mass fraction, add 200mL of absolute ethanol as the ball milling medium, use stainless steel balls as the grinding balls, and the ball-to-material ratio is 7:1 , wet ball milling on a planetary ball mill for 2 hours at a speed of 750 rpm to mix the materials evenly to obtain a mixed powder;

[0033] Step 2. Place graphite paper inside the graphite mold, dry the mixed powder and put it into the graphite mold, then put it into the sintering furnace for sintering under normal pressure, and raise the temperature from room temperature to 900°C at a heating rate of 10°C / min The sintering temperature is kept at the sintering temperature for 30 minutes and then naturally cooled with the furnace to obtain Ti x Al y Material; for Ti x Al y The material was crushed, then put into a stainless steel ball mill jar, and 200mL of absolute ethanol was added as the ball mill medium, wit...

Embodiment 2

[0039] Step 1. Put 65.78% of Ti powder and 34.22% of Al powder into a stainless steel ball milling tank by mass fraction, add 200mL of absolute ethanol as the ball milling medium, use stainless steel balls as the grinding balls, and the ball-to-material ratio is 7:1 , wet ball milling on a planetary ball mill for 2 hours at a speed of 750 rpm to mix the materials evenly to obtain a mixed powder;

[0040] Step 2. Place graphite paper inside the graphite mold, dry the mixed powder and put it into the graphite mold, then put it into the sintering furnace for sintering under normal pressure, and raise the temperature from room temperature to 900°C at a heating rate of 10°C / min The sintering temperature is kept at the sintering temperature for 30 minutes and then naturally cooled with the furnace to obtain Ti x Al y Material; for Ti x Al y The material was crushed, then put into a stainless steel ball mill jar, and 200mL of absolute ethanol was added as the ball mill medium, wit...

Embodiment 3

[0046] Step 1. Put 65.78% of Ti powder and 34.22% of Al powder into a stainless steel ball milling tank by mass fraction, add 200mL of absolute ethanol as the ball milling medium, use stainless steel balls as the grinding balls, and the ball-to-material ratio is 7:1 , wet ball milling on a planetary ball mill for 2 hours at a speed of 750 rpm to mix the materials evenly to obtain a mixed powder;

[0047] Step 2. Place graphite paper inside the graphite mold, dry the mixed powder and put it into the graphite mold, then put it into the sintering furnace for sintering under normal pressure, and raise the temperature from room temperature to 900°C at a heating rate of 10°C / min The sintering temperature is kept at the sintering temperature for 30 minutes and then naturally cooled with the furnace to obtain Ti x Al y Material; for Ti x Al y The material was crushed, then put into a stainless steel ball mill jar, and 200mL of absolute ethanol was added as the ball mill medium, wit...

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Abstract

The present invention discloses a Ti2AlC / TiAl-based composite and a preparation method thereof, firstly TixAly powder is prepared by reaction of Ti / Al, the TixAly powder and Ti3AlC2 powder are mixed evenly by wet milling, then dried and filled into a mold for vacuum hot pressing curing to obtain the Ti2AlC / TiAl-based composite. The Ti2AlC / TiAl-based composite comprises matrix phase TiAl and reinforcing phase Ti2AlC, Ti3AlC2 is completely converted into the Ti2AlC, and the Ti2AlC / TiAl-based composite is free of impurity phase TiC and the like. The preparation process is simple, the sintering temperature is low, production cost is low, the obtained composite is fine in organization and remarkable in toughening effect, and can greatly improve the strength and toughness of the TiAl intermetallic compound. The preparation method is suitable for industrial production, the obtained Ti2AlC / TiAl-based composite is expected for using in the manufacture of aircraft engine components and ultra high-speed aircraft wings and housings.

Description

technical field [0001] The invention belongs to the field of material science and engineering, and relates to a method for preparing a particle-reinforced TiAl-based composite material, in particular to a Ti 2 AlC / TiAl-based composite material and its preparation method. Background technique [0002] Ti-Al intermetallic compounds have attracted extensive attention in aerospace and other fields because of their excellent high-temperature mechanical properties and low density. TiAl-based alloy has high specific strength and specific modulus, good oxidation resistance and high creep resistance, and is a new type of lightweight high-temperature structural material with great application potential. However, TiAl-based alloys have poor plasticity and toughness at room temperature, are difficult to form and process, and have serious insufficient oxidation resistance at temperatures above 800 °C, which limits their practical applications. Studies on improving its room temperature ...

Claims

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Application Information

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IPC IPC(8): C22C1/05C22C29/06C22C32/00C22C14/00
Inventor 艾桃桃于琦李文虎袁新强邹祥宇
Owner SHAANXI UNIV OF TECH
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