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Method for preparing Ti2AlC complex part by combining in-situ selective laser forming with reactive sintering

A technology of laser selection and reaction, which is applied in the field of in-situ laser selection forming combined with reaction sintering to prepare Ti2AlC complex parts, which can solve the problems of weak reaction between TiC and TiAl, insufficient reaction thermodynamic driving force, short laser action time, etc., and achieve clean bonding interface , Reduce production cost, good compatibility effect

Pending Publication Date: 2020-10-09
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the short laser action time and insufficient reaction thermodynamic driving force, the reaction between TiC and TiAl is weak in the laser processing process, and Ti is synthesized in situ by selective laser melting. 2 AlC is also extremely difficult

Method used

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  • Method for preparing Ti2AlC complex part by combining in-situ selective laser forming with reactive sintering
  • Method for preparing Ti2AlC complex part by combining in-situ selective laser forming with reactive sintering
  • Method for preparing Ti2AlC complex part by combining in-situ selective laser forming with reactive sintering

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Embodiment 1

[0026] See figure 1 , This embodiment relates to an in-situ laser selective forming combined with reaction sintering to prepare Ti 2 The method of AlC complex parts includes the following steps:

[0027] (1) According to Ti 2 The composition of AlC Weigh titanium powder, aluminum powder, and graphite powder into a ball milling tank at a predetermined mass ratio, and add the ball to the milling ball at a ball-to-material ratio of 6:1, ball mill at a speed of 150r / min for 4 hours, and then dry and sieve A mixed powder is obtained. figure 2 The morphology and phase composition of the composite powder obtained by mixing are shown.

[0028] In this embodiment, the mixed powder consists of 71.1% by mass of titanium powder, 20.0% by mass of aluminum powder, and 8.9% by mass of graphite powder. The titanium powder is a spherical-like titanium powder with an average particle diameter of 1 μm, the aluminum powder is a spherical aluminum powder with an average particle diameter of 30 μm, and...

Embodiment 2

[0034] This embodiment relates to an in-situ laser selective forming combined with reaction sintering to prepare Ti 2 The AlC method includes the following steps:

[0035] (1) According to Ti 2 The composition of AlC Weigh titanium powder, aluminum powder, graphite powder and titanium carbide powder in a predetermined mass ratio into the ball milling tank, and add the ball to the milling ball at a ball-to-battery ratio of 8:1. After ball milling at a speed of 200r / min for 4h Drying and sieving to obtain mixed powder.

[0036] In this embodiment, the mixed powder is composed of 64.0% by mass titanium powder, 20.0% by mass aluminum powder, 7.1% by mass graphite powder, and 8.9% by mass titanium carbide powder. The titanium powder is a spherical-like titanium powder with an average particle diameter of 1 μm, the aluminum powder is a spherical aluminum powder with an average particle diameter of 20 μm, and the graphite powder is an irregular graphite powder with an average particle dia...

Embodiment 3

[0042] This embodiment relates to an in-situ laser selective forming combined with reaction sintering to prepare Ti 2 The AlC method includes the following steps:

[0043] (1) According to Ti 2 The composition of AlC Weigh titanium powder, aluminum powder, graphite powder and titanium carbide powder into a ball milling tank at a predetermined mass ratio, and add the ball to the grinding ball at a ball-to-battery ratio of 6:1. After ball milling at a speed of 150r / min for 4h Drying and sieving to obtain mixed powder.

[0044] In this embodiment, the mixed powder is composed of 49.8% by mass of titanium powder, 20.0% by mass of aluminum powder, 3.5% by mass of graphite powder, and 26.7% by mass of titanium carbide powder. The titanium powder is a spherical-like titanium powder with an average particle size of 1 μm, the aluminum powder is a spherical aluminum powder with an average particle size of 40 μm, and the graphite powder is an irregular graphite powder with an average particle...

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Abstract

The invention discloses a new method for preparing a Ti2AlC ceramic complex part by combining in-situ selective laser forming with reactive sintering. The preparation method comprises the following steps of: (1) weighing titanium powder, aluminum powder, graphite powder, titanium carbide powder and grinding balls according to the composition of Ti2AlC in a predetermined mass ratio, pouring the substances into a ball-milling tank, performing ball-milling for a period of time, and conducting drying and sieving to obtain mixed powder; (2) performing an in-situ selective laser forming process on the mixed powder to obtain a green body with a complex shape; and (3) carrying out pressureless sintering on the green body in flowing argon by adopting a high-temperature sintering furnace, and carrying out reaction to synthesize the Ti2AlC ceramic complex part. According to the method, the in-situ selective laser forming process is combined with the Ti2AlC reactive sintering process, raw materialselection and forming shapes are highly free, and a polymer binder does not need to be added.

Description

Technical field [0001] The invention relates to the technical field of preparation of ternary MAX ceramic materials, in particular to an in-situ laser selective forming combined with reaction sintering to prepare Ti 2 The method of AlC complex parts. Background technique [0002] Ti 2 AlC belongs to the ternary layered compound M n+1 AX n Phase (where M is a transition metal element, A is a group III-A or IV-A element, X is C or N, n=1-3), its crystal structure consists of two TiC lamellae and a layer of Al atomic plane Alternate stacking composition. Unique crystal structure and chemical bond characteristics give Ti 2 The excellent properties of AlC ceramics and metals include low density, high modulus, high strength, good electrical and thermal conductivity, excellent thermal shock resistance and high temperature oxidation resistance. These characteristics make Ti 2 AlC has broad application prospects in the field of high-temperature structures. Currently Ti 2 AlC is mainly u...

Claims

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Application Information

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IPC IPC(8): C04B35/56C04B35/65
CPCC04B35/5618C04B35/65C04B2235/402C04B2235/3843C04B2235/6586C04B2235/665C04B2235/668C04B2235/6562C04B2235/6567
Inventor 廖文和刘婷婷张凯邹志永熊志伟闫志隆陈香媛顾明飞陈丹
Owner NANJING UNIV OF SCI & TECH
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