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A kind of density gradient material and preparation method thereof

A technology of density gradient and gradient layer, which is applied in the field of gradient material preparation, can solve the problems of high relative density and layered distribution of density gradient materials, and achieve the effect of preventing oxidation

Active Publication Date: 2020-04-28
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a density gradient material and its preparation method to meet the performance, structure and lightweight requirements of the material in view of the problems of the existing density gradient material, such as high relative density, layered distribution instead of continuous gradient distribution, etc.

Method used

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  • A kind of density gradient material and preparation method thereof
  • A kind of density gradient material and preparation method thereof
  • A kind of density gradient material and preparation method thereof

Examples

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Effect test

Embodiment 1

[0054] Establish a cylindrical three-dimensional model diagram with a diameter of φ=40mm and a thickness of h=3mm, slice the model diagram into plane figures with a thickness of 0.2mm, and fill the scanning path of each plane figure. The designed density gradient material is composed of 11 kinds of gradient layers, and the volume content of Ti6Al4V is 100%, 90%, 80%, 70%, 60%, 50%, 40%, 30%, 20%, 10%, 0%. , including four layers of 100% Ti6Al4V, and one layer of other components, each layer is 0.2mm thick. According to the previous research, set the parameters of each layer: laser power 140-180 (W), scanning speed 400-600 (mm / min), Ti6Al4V powder feeding amount 0-0.88 (g / min), AlSi10Mg powder feeding amount 0-0.53 (g / min), carrier gas flow rate 7-9 (L / min), protective gas flow rate 160-200 (L / h), Z-axis single-layer stroke △z=0.2mm, and input the parameters into the computer numerical control system. Pour the Ti6Al4V powder and AlSi10Mg powder into the left and right powder d...

Embodiment 2

[0056] Establish a cylindrical three-dimensional model diagram with a diameter of φ=40mm and a thickness of h=7.2mm, slice the model diagram into plane figures with a thickness of 0.2mm, and fill the scanning path of each plane figure. The designed density gradient material is composed of 30 gradient layers, and the volume content of Ti6Al4V is 100%, 90%, 80%, 70%, 60%, 50%, 40%, 30%, 20%, 10%, 0%. , 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90 %, 95%, 100%, of which the first 100% Ti6Al4V is divided into four layers (that is, the powder coating thickness is 0.8mm), and the second 100% Ti6Al4V is also divided into four layers (that is, the powder coating thickness is 0.8mm), and the other components are One layer, each layer 0.2mm thick. According to the previous research, set the parameters of each layer: laser power 140-180 (W), scanning speed 400-600 (mm / min), Ti6Al4V powder feeding amount 0-0.88 (g / min), AlSi10Mg powder feeding amount...

Embodiment 3

[0058] Establish a three-dimensional model of a cube with a diameter of 30mm×30mm×4mm, slice the model into plane figures with a thickness of 0.2mm, and fill the scanning path of each plane figure. The designed density gradient material is composed of 5 kinds of gradient layers, the volume content of Ti6Al4V is 100%, 80%, 60%, 40%, 20% in turn, each composition is four layers, and each layer is 0.2mm thick. According to the previous research, set the parameters of each layer: laser power 150-180 (W), scanning speed 400-600 (mm / min), Ti6Al4V powder feeding amount 0.18-0.88 (g / min), AlSi10Mg powder feeding amount 0-0.43 (g / min), carrier gas flow rate 7-9(L / min), protective gas flow rate 160-200(L / h), Z-axis single-layer stroke △z=0.2mm, and input the parameters into the computer numerical control system. Pour the Ti6Al4V powder and AlSi10Mg powder into the left and right powder feeding cylinders 1 respectively, and fix the cold-rolled pure titanium substrate 11 with the specific...

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Abstract

The invention relates to a titanium-aluminum alloy density gradient material and a preparation method thereof. The composition of each layer of the designed titanium-aluminum alloy density gradient material has a small change in composition and a gradient change, preferably a quasi-continuous gradient change. Its preparation method uses Ti6Al4V powder and AlSi10Mg powder as raw materials, adopts a coaxial real-time variable ratio powder feeding method, gradually changes the composition of titanium alloy and aluminum alloy powder, melts the metal powder with a high-power laser beam, and manufactures it by layer-by-layer superposition. The composition of the titanium-aluminum alloy density gradient material prepared by the present invention has a small change in composition and a gradient change between layers, and the material properties (such as hardness) along the thickness direction have a gradient change, and gradient materials with complex shapes can be prepared. The titanium-aluminum alloy density gradient material designed and prepared by the present invention is a low-density material, which can meet the light weight and high strength requirements of materials in aerospace, automobile manufacturing and other fields, and has important theoretical significance and practical application value.

Description

technical field [0001] The invention belongs to the technical field of preparation of gradient materials, in particular to a method for preparing density gradient materials using laser direct manufacturing technology, and in particular to a titanium-aluminum alloy density gradient material and a preparation method thereof. Background technique [0002] Titanium alloys and aluminum alloys have become key development materials for aerospace due to their high specific strength, low density, good corrosion resistance, good plasticity, and excellent thermodynamic properties. According to the special performance requirements of aerospace materials, the properties of titanium alloy and aluminum alloy are combined to prepare light-weight and high-strength continuous density gradient materials, which can greatly improve the requirements for lightweight and performance of structural parts in the aerospace field, and can withstand ultra-high-speed impact Density gradients can lead to c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F3/105C22C1/04
CPCC22C1/04B33Y10/00B33Y50/02B33Y70/00B33Y80/00B22F10/00B22F10/38B22F10/322B22F10/25B22F10/36B22F12/58Y02P10/25
Inventor 马运柱刘阳刘文胜张诚刘超龙路平
Owner CENT SOUTH UNIV