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A method for preparing heterogeneous materials by plasma cladding

A technology of plasma cladding and plasma gas, which is applied in metal material coating technology, additive manufacturing, additive processing, etc., can solve the problem of difficulty in guaranteeing the bonding strength of the composite interface, high precision requirements for equipment and molds, and difficulty in controlling interface oxidation, etc. problems, to avoid the incorporation of impurities and interface oxidation, to meet the needs of strengthening and toughening, and to achieve various cladding styles and shapes.

Active Publication Date: 2022-04-01
NANJING UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are the following problems in this technology: (1) It is difficult to control the oxidation of the interface; (2) The size of the sample obtained by high-pressure torsion is too small; (3) The precision requirements for equipment and molds are very high, the process is complicated, and the production efficiency is low.
Its limitations are: (1) The pre-rolling treatment work includes multiple operations such as surface cleaning, cutting, argon arc welding sealing, heating, etc. The requirements are high and the production efficiency is low; (2) There are surface cleanliness, sealing Oxidation is difficult to control during hot rolling; (3) It is difficult to guarantee the bonding strength of the composite interface

Method used

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  • A method for preparing heterogeneous materials by plasma cladding
  • A method for preparing heterogeneous materials by plasma cladding
  • A method for preparing heterogeneous materials by plasma cladding

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0045] Example 1: Plasma cladding Al / 7075 aluminum alloy strip heterostructure

[0046] (1) Pretreatment: including substrate pretreatment and cladding powder pretreatment.

[0047] Substrate pretreatment: cutting the high-strength 7075 aluminum alloy into strips with a size of 100mm×20mm×20mm. Then carry out sandblasting (black corundum sand) treatment on 7075 aluminum alloy to remove rust. During sandblasting, the gun is 6cm away from the sample surface, and the sandblasting angle is 80°. After sandblasting, it is blown with cold compressed air; Ultrasonic cleaning for 30 minutes in order to remove oil, dry and set aside.

[0048] Cladding powder pretreatment: sieve the high-toughness Al and high-strength 7075 aluminum alloy powder for the second time, so that the particle size distribution is 80-100 mesh, and the powder shape is spherical or spherical; Keep drying at 150°C for 4 hours in a vacuum drying oven, and it can be turned during the drying process.

[0049] (2) B...

example 2

[0055] Example 2: Plasma cladding Al / 7075 aluminum alloy bulk heterostructure

[0056] (1) Pretreatment: including substrate pretreatment and cladding powder pretreatment.

[0057] Substrate pretreatment: cutting the high-strength 7075 aluminum alloy into blocks with a size of 60mm×40mm×30mm. Then carry out sandblasting (black corundum sand) treatment on 7075 aluminum alloy to remove rust. During sandblasting, the gun is 6cm away from the sample surface, and the sandblasting angle is 80°. After sandblasting, it is blown with cold compressed air; Ultrasonic cleaning for 30 minutes in order to remove oil, dry and set aside.

[0058] Cladding powder pretreatment: sieve the high-toughness Al and high-strength 7075 aluminum alloy powder for the second time, so that the particle size distribution is 80-100 mesh, and the powder shape is spherical or spherical; Keep drying at 150°C for 4 hours in a vacuum drying oven, and it can be turned during the drying process.

[0059] (2) Bot...

example 3

[0065] Example 3: Concave-convex heterogeneous structure of plasma cladding Al / 7075 aluminum alloy

[0066](1) Pretreatment: including substrate pretreatment and cladding powder pretreatment.

[0067] Substrate pretreatment: Cut the high-strength 7075 aluminum alloy into a concave-convex shape with a lower plane size of 45mm×30mm×10mm and three upper convex sizes of 45mm×10mm×10mm (size 1) distributed on the left, middle and right sides. Then carry out sandblasting (black corundum sand) treatment on 7075 aluminum alloy to remove rust. During sandblasting, the gun is 6cm away from the sample surface, and the sandblasting angle is 80°. After sandblasting, it is blown with cold compressed air; Ultrasonic cleaning for 30 minutes in order to remove oil, dry and set aside.

[0068] Cladding powder pretreatment: sieve the high-toughness Al and high-strength 7075 aluminum alloy powder for the second time, so that the particle size distribution is 80-100 mesh, and the powder shape is ...

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Abstract

The invention belongs to the field of preparation of heterogeneous materials, and in particular relates to a method for preparing heterogeneous materials by plasma cladding. Including pretreatment, bottom cladding, multi-layer cladding and solid solution aging precipitation four-step process. The specific steps are: use plasma cladding, cladding high-strength material B on the substrate of high-strength material A, and then cladding high-toughness material A on the substrate of high-strength material B, repeat the above according to the specific overlapping stacking method Finally, the controllable and designable heterogeneous materials in the three-dimensional direction are obtained through solid solution aging precipitation, and finally realize the high strength and high toughness of the material. The invention prepares multi-layer complex heterogeneous composite materials through plasma cladding process and solid solution aging precipitation, effectively avoids the mixing of impurities and interface oxidation, is easy to carry out industrial production, and has a wide range of applicable raw materials, and cladding styles and shapes There are various changes, and the controllable design of the heterogeneous structure in the three-dimensional direction is realized.

Description

technical field [0001] The invention belongs to the field of preparation of heterogeneous materials, and in particular relates to a method for preparing heterogeneous materials by plasma cladding. Background technique [0002] Metal structural materials are widely used in military, industrial, aviation and other fields. People improve the mechanical properties of materials through a variety of strengthening and toughening mechanisms, making them more efficient and safe to use. However, for homogeneous materials, the improvement of strength is often at the expense of plasticity, which severely limits the application and development of structural materials. Therefore, how to achieve both strength and plasticity has become a hot spot and focus in the research of metal structural materials. [0003] Heterogeneous materials are a new type of high-strength and high-toughness materials proposed in recent years. Different from traditional homogeneous materials, it constructs soft...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F3/105B22F10/28C23C24/10B22F3/24C22F1/04B33Y10/00B33Y70/00
CPCC23C24/103B22F3/24C22F1/04B33Y10/00B33Y70/00B22F2003/248B22F10/00B22F10/25B22F10/34B22F10/36B22F10/32Y02P10/25
Inventor 周浩黄家喜高波肖礼容陈雪飞曹阳李玉胜聂金凤
Owner NANJING UNIV OF SCI & TECH
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