Grain refinement and preparation method of Fe-Ni-SiO2 alloy coating

A fe-ni-sio2, alloy coating technology, applied in metal material coating process, coating, etc., can solve problems such as cracking of deposited layers, achieve low cost, improve comprehensive mechanical properties, and high degree of automation

Inactive Publication Date: 2020-04-21
EAST CHINA JIAOTONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] There are few reports on the laser deposition of Invar alloys. According to the author's previous research, the use of the low expansion characteristics of Invar alloys can effectively solve the problem of cracking of the deposited layer.

Method used

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  • Grain refinement and preparation method of Fe-Ni-SiO2 alloy coating
  • Grain refinement and preparation method of Fe-Ni-SiO2 alloy coating
  • Grain refinement and preparation method of Fe-Ni-SiO2 alloy coating

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Embodiment 1

[0026] A Fe-Ni-SiO2 alloy coating grain refinement and a preparation method thereof, mainly comprising the following steps:

[0027] Substrate pretreatment:

[0028] The material of the substrate is No. 45 steel, and the size is 100mm×100mm×10mm. The QF-6050 manual sandblasting machine is used to blast the substrate, and the abrasive is emery.

[0029] Composite powder preparation:

[0030] Select suitable Fe, Ni and SiO2 powders with appropriate particle size, and use ball milling process to mix them evenly. The particle size range of the powder is 150-300 mesh, and the chemical composition is: Invar alloy powder+SiO2 is 2wt%.

[0031] Preparation of bulk materials by laser multilayer superposition deposition technology:

[0032] The single-layer overlapping deposition path is "S" type. After the single-layer deposition is completed, the laser cladding head moves up and the coordinates return to the initial position. The single-layer overlapping deposition process is repea...

Embodiment 2

[0035] A Fe-Ni-SiO2 alloy coating grain refinement and a preparation method thereof, mainly comprising the following steps:

[0036] Substrate pretreatment:

[0037] The material of the substrate is No. 45 steel, and the size is 100mm×100mm×10mm. The QF-6050 manual sandblasting machine is used to blast the substrate, and the abrasive is emery.

[0038] Composite powder preparation:

[0039] Select suitable Fe, Ni and SiO2 powders with appropriate particle size, and use ball milling process to mix them evenly. The particle size range of the powder is 150-300 mesh, and the chemical composition is: Invar alloy powder+SiO2 is 4wt%.

[0040] Preparation of bulk materials by laser multilayer superposition deposition technology:

[0041] The single-layer overlapping deposition path is "S" type. After the single-layer deposition is completed, the laser cladding head moves up and the coordinates return to the initial position, repeating the single-layer overlapping deposition proces...

Embodiment 3

[0044] A Fe-Ni-SiO2 alloy coating grain refinement and a preparation method thereof, mainly comprising the following steps:

[0045] Substrate pretreatment:

[0046] The material of the substrate is No. 45 steel, and the size is 100mm×100mm×10mm. The QF-6050 manual sandblasting machine is used to blast the substrate, and the abrasive is emery.

[0047] Composite powder preparation:

[0048] Select suitable Fe, Ni and SiO2 powders with appropriate particle size, and use ball milling process to mix them evenly. The particle size range of the powder is 150-300 mesh, and the chemical composition is: Invar alloy powder + SiO2 is 6 wt%.

[0049] Preparation of bulk materials by laser multilayer superposition deposition technology:

[0050] The single-layer overlapping deposition path is "S" type. After the single-layer deposition is completed, the laser cladding head moves up and the coordinates return to the initial position, repeating the single-layer overlapping deposition pro...

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Abstract

The invention relates to a grain refinement and preparation method of a Fe-Ni-SiO2 alloy coating. The Fe-Ni-based alloy wear-resistant coating is prepared from Fe powder, Ni powder and SiO2 powder through a laser metal direct deposition technology and specifically comprises steps of screening out element powder with proper particle size, uniformly mixing in proportion, ball-milling, drying at constant temperature, conveying the ground powder to a surface of a substrate, and melting and depositing the mixed powder on the surface of the substrate by using a laser light source under the protection of argon. The method is advantaged in that by controlling the number of heterogeneous nucleation cores in the solidification process, microstructure morphology control over the Fe-Ni-based alloy coating in the laser metal direct deposition process is simply and effectively achieved, the obtained coating is free of hot cracks and has good combination with a substrate.

Description

technical field [0001] The invention relates to the field of laser processing of metal material surface coatings, more specifically, the invention relates to grain refinement of Fe-Ni-SiO2 alloy coatings and a preparation method thereof. Background technique [0002] At present, the problem of residual stress has become one of the main problems affecting the large-scale commercial application of laser deposition forming. Therefore, it is of great practical significance to study the evolution of material temperature, structure, and physical properties in the process of laser deposition forming, explore the influence law and mechanism of stress evolution, realize high-precision calculation of stress, and then realize the adjustment of stress level and distribution. [0003] There are few reports on the laser deposition of Invar alloys. According to the author's previous research, the use of the low expansion characteristics of Invar alloys can effectively solve the problem of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C24/10B22F9/04C22C38/02C22C38/08
CPCB22F9/04B22F2009/043C22C38/02C22C38/08C23C24/103
Inventor 赵明娟喻世豪赵龙志唐延川王怀邓楚祥张鹏刘德佳沈明学
Owner EAST CHINA JIAOTONG UNIVERSITY
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