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A kind of composite powder for surface welding of az91d magnesium-based materials

A composite powder and surface surfacing technology, which is applied in the field of alloy composite powder, can solve problems such as cracks or pores at the joint between the coating and the substrate, wear resistance problems that are not applicable, and affect the wear resistance of components, and achieve the surface of the surfacing layer Smooth and uniform, improve surface wear resistance, prolong wear cycle and service life

Active Publication Date: 2021-01-05
JIANGSU UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the above technologies and powder materials temporarily solve some material wear resistance problems, they still have great limitations, especially for solving the problem of improving the wear resistance of AZ91 magnesium-based composite materials. For example, the application of traditional alloy powder materials to The surface processing of AZ91 magnesium-based composite materials will cause defects such as easy peeling of the coating and cracks or pores at the joint between the coating and the substrate, which will seriously affect the overall wear resistance of the component.

Method used

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  • A kind of composite powder for surface welding of az91d magnesium-based materials

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] The plasma surfacing process test was carried out on the surface of SiC / AZ91 magnesium matrix composite material. The mass percentage of each component of the alloy powder material is: B: 2.0%; Y: 0.1%; Al: 6.0%; Zr: 2.1%%; C : 1.2%; Zn: 0.6%; Mn: 0.9%; Si: 1.6%; Fe: 1%; Cu: balance; surfacing powder particle size: 50 mesh.

[0015] Its process parameters are: welding torch height: 9mm; main arc current: 100A; maintenance arc current: 25A; turntable speed: 0.10 (control box display value); powder feeding motor: 48V (no load) 32V (load); ion gas flow : 0.30m 3 / h; protective gas flow: 0.2m 3 / h; Powder feeding air flow: 0.26m 3 / h; swing amplitude: 4.5mm; swing frequency: 4Hz; swing dwell time: left=right=1.4s.

[0016] Test results: if figure 1 As shown in (a), the thickness of the surfacing layer on the surface of AZ91 magnesium-based composite material is about 3.2mm, the appearance is good, and the overall shape meets the requirements. Cracks; this welding speci...

Embodiment 2

[0018] The plasma surfacing process test was carried out on the surface of Si3N4 / AZ91 magnesium-based composite material. The mass percentage of each component of the alloy powder material is: B: 1.0%; Eu 2 o 3 : 0.8%; Al: 8.9%; Zr: 3.2%; C: 1.8%; Zn: 1.5%; Mn: 1.5%; Si: 2.6%; Fe: 0.5%; Cu: balance; 230 mesh.

[0019] Its process parameters are: welding torch height: 10mm; main arc current: 105A; maintenance arc current: 28A; turntable speed: 0.11 (control box display value); powder feeding motor: 48V (no load) 32V (load); ion gas flow : 0.35m 3 / h; shielding gas flow: 0.3m 3 / h; Powder feeding air flow: 0.30m 3 / h; swing amplitude: 4.5mm; swing frequency: 4Hz; swing dwell time: left=right=1.6s.

[0020] Test results: The thickness of the surfacing layer on the surface of SiC / AZ91 magnesium-based composite material is about 3.3mm. The appearance is good, and the overall shape meets the requirements. ; This welding specification meets the requirements of spray welding, an...

Embodiment 3

[0022] The plasma surfacing process test was carried out on the surface of AlN / AZ91 magnesium matrix composite material. The mass percentage of each component of the alloy powder material is: B: 2.5%; Eu2O3: 0.2%; Y: 0.5; Al: 6.9%; Zr: 3.2 %; C: 1.2%; Zn: 0.6%; Mn: 0.9%; Si: 1.6%; Fe: 1%;

[0023] Its process parameters are: welding torch height: 11mm; main arc current: 110A; maintenance arc current: 30A; turntable speed: 0.12 (display value of control box); powder feeding motor: 48V (no load) 32V (load); ion gas flow : 0.35m 3 / h; shielding gas flow: 0.4m 3 / h; powder feeding air flow: 0.35m 3 / h; swing amplitude: 4.5mm; swing frequency: 4Hz; swing dwell time: left=right=1.8s.

[0024]Test results: The thickness of the surfacing layer on the surface of AlN / AZ91 magnesium-based composite material is about 3.4mm, the appearance is good, and the overall shape meets the requirements. The measured hardness of the surfacing layer is HRC: 42.88. After turning, X-ray flaw detectio...

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Abstract

The invention discloses a composite powder for surfacing welding on the surface of magnesium-based materials, specifically for the composite powder of AZ91D magnesium-based material surface surfacing treatment to improve its wear resistance. Under the premise of surfacing welding process, the wear resistance, corrosion resistance and high temperature erosion resistance of AZ91D magnesium-based materials are significantly improved. This alloy powder material is characterized by adding rare earth element europium (Eu) or yttrium (Y) to the traditional alloy powder to promote the formation of a new nano-layered intermetallic compound, which increases the wear resistance of the composite material surface by 35% after plasma surfacing At the same time, the surfacing layer is smooth and uniform without pores and cracks, which greatly prolongs the wear cycle and service life of AZ91D magnesium-based composite parts.

Description

technical field [0001] The invention relates to a composite powder for surfacing welding on a metal surface, in particular to an alloy composite powder for plasma surfacing welding on the surface of an AZ91D magnesium-based material. Background technique [0002] AZ91 magnesium-based materials have been successfully applied in optical precision instruments, automobile bodies and engines, and aerospace vehicle structures due to their excellent properties such as low density, low thermal expansion coefficient, high specific stiffness and specific strength. However, the AZ91 magnesium-based composite material itself also has certain defects and deficiencies. The AZ91 magnesium alloy matrix has low hardness, high friction coefficient, easy to strain and difficult to lubricate, resulting in poor wear resistance. Throughout the field of metal materials, one of the main reasons for the consumption and failure of metal materials is wear. According to relevant statistics, the direct...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K35/30B23K10/02
Inventor 李惠孔德福焦雷陆圣波钟武徐品一徐东张雄
Owner JIANGSU UNIV OF SCI & TECH