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A kind of in-situ self-generated titanium-aluminum-carbon toughened tial3 intermetallic compound and preparation method thereof

An intermetallic compound and in-situ self-generation technology, which is applied in the field of materials science and engineering, can solve the problems of high equipment requirements, many process influencing factors, and high production costs, and achieve low preparation costs, strong process controllability, and improved mechanical properties. Effect

Inactive Publication Date: 2016-04-13
SHAANXI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The above method uses Al with strong hygroscopicity 4 C 3 As raw material, and using spark plasma sintering system, the equipment requirements are high, the production cost is high, the process has many influencing factors, and it is easy to produce TiC impurity phase

Method used

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  • A kind of in-situ self-generated titanium-aluminum-carbon toughened tial3 intermetallic compound and preparation method thereof
  • A kind of in-situ self-generated titanium-aluminum-carbon toughened tial3 intermetallic compound and preparation method thereof
  • A kind of in-situ self-generated titanium-aluminum-carbon toughened tial3 intermetallic compound and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Step 1. According to the mass fraction, 50.95% of Ti powder, 29.53% of Al powder, 18.04% of TiC powder and 1.48% of multi-walled carbon nanotubes (a purity of more than 95%, a diameter of 1 to 2 nm, and a length of 1~2μm) into a stainless steel ball mill tank, add 200mL of absolute ethanol as the ball milling medium, stainless steel balls as grinding balls, the ball-to-material ratio is 7:1, wet ball milling on a planetary ball mill at a speed of 750 rpm After 2 hours, the materials were mixed evenly to obtain a mixed powder;

[0037] Step 2. Dry the mixed powder at 50°C and put it into a graphite mold, cold press it into a cake shape under a molding pressure of 5 MPa, then put it into a vacuum hot-press furnace for vacuum hot-press sintering and solidification, and rise from room temperature to to 1350°C, the temperature rise rate before 900°C is 8°C / min, and the temperature rise rate after 900°C is 7.5°C / min, and when the temperature rises to 200°C, turn on the pressu...

Embodiment 2

[0042] Step 1. According to the mass fraction, 46.98% Ti powder, 27.56% Al powder, 23.98% TiC powder and 1.48% multi-walled carbon nanotubes (purity of more than 95%, diameter of 1-2nm, length of 1~2μm) into a stainless steel ball mill tank, add 200mL of absolute ethanol as the ball milling medium, stainless steel balls as grinding balls, the ball-to-material ratio is 7:1, wet ball milling on a planetary ball mill at a speed of 750 rpm After 2 hours, the materials were mixed evenly to obtain a mixed powder;

[0043] Step 2. Dry the mixed powder at 50°C and put it into a graphite mold, cold press it into a cake shape under a molding pressure of 5 MPa, then put it into a vacuum hot-press furnace for vacuum hot-press sintering and solidification, and rise from room temperature to to 1350°C, the temperature rise rate before 900°C is 8°C / min, and the temperature rise rate after 900°C is 7.5°C / min, and when the temperature rises to 200°C, turn on the pressurizing device, adjust the ...

Embodiment 3

[0053] Step 1. According to the mass fraction, 49.58% of Ti powder, 28.10% of Al powder, 19.82% of TiC powder and 2.50% of multi-walled carbon nanotubes (purity of more than 95%, diameter of 8-10nm, length of 12~15μm) into a stainless steel ball mill tank, add 200mL of acetone as the ball milling medium, stainless steel balls as grinding balls, the ball-to-material ratio is 5:1, and wet-mill on a planetary ball mill for 1 hour at a speed of 600 rpm , so that the materials are mixed evenly to obtain a mixed powder;

[0054] Step 2. Dry the mixed powder at 40°C and put it into a graphite mold, cold press it into a cake shape under a molding pressure of 3MPa, and then put it into a vacuum hot-press furnace for vacuum hot-press sintering and solidification. to 1400°C, the temperature rise rate before 900°C is 7°C / min, and the temperature rise rate after 900°C is 5°C / min, and when the temperature rises to 300°C, turn on the pressurizing device, adjust the pressure to 8MPa, and main...

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Abstract

The invention relates to an in-situ titanium-aluminum-carbon toughened TiAl3 intermetallic compound and a preparation method thereof. The preparation method comprises the steps of ball-milling Ti powder, Al powder, TiC powder and multi-walled carbon nanotube, mixing uniformly, drying, carrying out cold-press molding and then carrying out vacuum hot press sintering and curing to obtain the in-situ titanium-aluminum-carbon toughened TiAl3 intermetallic compound. The intermetallic compound consists of TiAl3 serving as a matrix phase and a mixture of Ti2AlC and Ti3AlC2 or Ti2AlC serving as an enhancing phase and is free of impurity phase. The preparation method disclosed by the invention has the advantages of simple process, strong controllability, low sintering temperature and production cost, high product purity, low impurity content and obvious toughening effect. The strength and toughness of the TiAl3 intermetallic compounds can be greatly improved; compared with TiAl3, the material obtained has the advantages that the maximum bending strength reaches up to 343MPa and is increased by more than twice and the maximum fracture toughness is up to 6.5MPa.m<1 / 2> and is increased by more than 3 times. The material is expected to be put into engineering application.

Description

technical field [0001] The invention belongs to the field of material science and engineering, and in particular relates to an in-situ self-generated titanium-aluminum-carbon toughened TiAl 3 Intermetallic compounds and methods for their preparation. Background technique [0002] Ti-Al intermetallic compounds are highly valued in aerospace and other fields because of their excellent high-temperature mechanical properties and low density. For Ti-Al alloys, to have DO 22 Structure TiAl 3 The density is the lowest, about 3.36g / cm 3 , so it has high specific modulus and specific strength; in addition, its melting point is as high as 1413K. However, due to the low symmetry of the DO 22 structure does not provide a sufficient slip system such that TiAl 3 Its severe room temperature brittleness makes it difficult to apply. Studies on improving its plasticity at room temperature have achieved obvious results. The literature (Zhang Yonggang, Han Yafang, Chen Guoliang, Guo Jian...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C14/00C22C29/06C22C1/05
Inventor 艾桃桃冯小明刘芳于琦夏鹏举袁新强解念锁
Owner SHAANXI UNIV OF TECH
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