In-situ generated Ti2AlC ceramic layer on surface of titanium substrate and preparation method of in-situ generated Ti2AlC ceramic layer

An in-situ generation and in-situ preparation technology, applied in the field of surface protection, can solve the problems of insufficient density of the AlC layer, low bonding force of the substrate, and thin AlC layer, so as to facilitate the transmission of mechanical properties, improve surface friction properties, Excellent self-lubricating effect

Active Publication Date: 2021-05-11
BEIJING JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Ti 2 It has been reported that AlC has been applied to the surface protective layer, but the adopted processes are spraying and physical vapor deposition, and these methods have inherent deficiencies: first, the Ti prepared by the two 2 The AlC layer is formed ex-situ, and has low binding force with the substrate. Secondly, the Ti prepared by the two methods 2 The AlC layer is not dense enough to exert its maximum performance advantages. In addition, the Ti prepared by physical vapor deposition 2 AlC layer thickness is thin and unstable
In addition to no in situ generation of Ti 2 In addition to the reports of AlC protective layer, Ti 2 A report on the application of AlC to the surface protection layer of titanium and titanium alloys

Method used

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  • In-situ generated Ti2AlC ceramic layer on surface of titanium substrate and preparation method of in-situ generated Ti2AlC ceramic layer
  • In-situ generated Ti2AlC ceramic layer on surface of titanium substrate and preparation method of in-situ generated Ti2AlC ceramic layer
  • In-situ generated Ti2AlC ceramic layer on surface of titanium substrate and preparation method of in-situ generated Ti2AlC ceramic layer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Prepare 0.2mm Ti on the surface of titanium substrate 2 AlC ceramic layer. Specific steps are as follows:

[0029] (1) Weigh 23.9g of Al powder and 37.58g of TiC powder and place them in a ball mill jar, and put them into agate balls according to the ball-to-material ratio of 5:1. Put the ball mill jar on a roller ball mill and mill at a speed of 100r / min for 10h to make it evenly mixed.

[0030] (2) Sieve the ball-milled powder with an 80-mesh sieve.

[0031] (3) Lay 17.67g of titanium powder on the bottom of a mold with a diameter of 50mm to obtain a matrix with a thickness of 2mm, and perform cold pressing at a pressure of 10MPa. Then 1.46 g of sieved mixed powder was weighed, spread evenly on the surface of the matrix powder layer, and cold pressed again at 20 MPa.

[0032] (4) The sintering molding is carried out by hot pressing sintering. The specific parameters are: in a high-purity argon atmosphere, the temperature is raised to 1450°C at a heating rate of 1...

Embodiment 2

[0034] Prepare 0.9mm Ti on the surface of titanium substrate 2 AlC ceramic layer. Specific steps are as follows:

[0035] (1) Weigh 27.25g of Al powder and 37.58g of TiC powder and place them in a ball mill jar, and put them into agate balls according to the ball-to-material ratio of 3:1. Put the ball mill jar on a roller ball mill for 12 hours at a speed of 120r / min to make it evenly mixed.

[0036] (2) Sieve the ball-milled powder with an 80-mesh sieve.

[0037] (3) Lay 26.5g of titanium powder on the bottom of a mold with a diameter of 50mm to obtain a matrix with a thickness of 3mm, and perform cold pressing at a pressure of 15MPa. Then 9.95 g of sieved mixed powder was weighed, spread evenly on the surface of the base powder layer, and cold pressed again at 20 MPa.

[0038](4) The sintering molding is carried out by hot pressing sintering. The specific parameters are: in a high-purity argon atmosphere, the temperature is raised to 1450°C at a heating rate of 10°C / min...

Embodiment 3

[0040] Preparation of 0.3mm Ti on the surface of TC4 titanium alloy 2 AlC ceramic layer. Specific steps are as follows:

[0041] (1) Weigh 26g of Al powder and 26.8g of TiC powder and place them in a ball mill jar, and put them into agate balls according to the ball-to-material ratio of 5:1. Put the ball mill jar on a roller ball mill and mill at a speed of 100r / min for 10h to make it evenly mixed.

[0042] (2) Sieve the ball-milled powder with an 80-mesh sieve.

[0043] (3) Lay 88.35g of TC4 alloy powder on the bottom of a mold with a diameter of 50mm to obtain a matrix with a thickness of 10mm, and perform cold pressing at a pressure of 150MPa. Then 2.64 g of sieved mixed powder was weighed, spread evenly on the surface of the matrix powder layer, and cold pressed again at 20 MPa.

[0044] (4) The sintering molding is carried out by hot pressing sintering. The specific parameters are: in a high-purity argon atmosphere, the temperature is raised to 1450°C at a heating ra...

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Abstract

The invention discloses an in-situ generated Ti2AlC ceramic layer on the surface of a titanium substrate and a preparation method of the in-situ generated Ti2AlC ceramic layer. A Ti2AlC ceramic layer with a controllable and stable thickness range is generated on the surface of a titanium and titanium alloy substrate in situ from a composite material by adopting a powder metallurgy means. Ti2AlC serving as one of representatives of an MAX phase material has good self-lubricating performance and excellent tribological performance, and the Ti2AlC serving as a protective layer is beneficial to improving the tribological performance and the use temperature of a titanium and titanium alloy surface. In addition, a TiXAly transition layer is generated between the ceramic layer and the titanium substrate, and the interface bonding between the transition layer and the ceramic layer and the interface bonding between the transition layer and the substrate are good, so that the transmission of mechanical properties between the ceramic layer and a substrate layer is facilitated. The method disclosed by the invention can be applied to the fields of aerospace manufacturing and high temperature.

Description

technical field [0001] The invention relates to in-situ generation of Ti on the surface of a titanium substrate 2 An AlC ceramic layer and a preparation method thereof belong to the field of surface protection. Background technique [0002] Due to its outstanding advantages such as low density, excellent corrosion resistance, high strength and high specific strength, titanium and titanium alloys have broad application prospects in the fields of aerospace, chemical processing and desalination equipment. However, the applications in these fields are faced with friction and wear conditions. The low surface hardness of titanium and titanium alloys and the characteristics of difficulty in lubrication make their friction and wear properties poor, which greatly limits their applications. Therefore, it is necessary to carry out surface treatment to improve its friction and wear properties, but the current common surface nitriding and ion implantation cannot improve the lubricity of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/14B22F7/02B22F9/04
CPCB22F3/14B22F7/02B22F9/04B22F2009/043
Inventor 黄振莺王弘杰胡文强于群李学王渊博周洋李世波李翠伟于文波
Owner BEIJING JIAOTONG UNIV
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