Preparation method of laser cladding coating of tridimensional space stacking net additive

A three-dimensional space, laser cladding technology, applied in laser welding equipment, metal processing equipment, heating inorganic powder coating, etc., can solve the problems of single material, cracks, pores, etc., achieve high energy density, simple preparation method, no Effects of Environmental Pollution

Inactive Publication Date: 2014-04-02
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the existing laser cladding technology, the mesh additive material is single, and defects such as cracks and pores still exist

Method used

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  • Preparation method of laser cladding coating of tridimensional space stacking net additive
  • Preparation method of laser cladding coating of tridimensional space stacking net additive

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) Manufacture of three-dimensional space stacking net-like additives: iron-based powder is Fe55 powder bonded with water-soluble

[0030] agent (polyethylene glycol and polymethyl methacrylate prepared at a volume ratio of 4:1), the mixture is extruded through the nozzle for spinning, and the metal wire with a thickness of 0.25~1.0mm , Weaving into three kinds of nets with different pitches, the pitches are 0.25, 0.5, 1.0mm respectively. The water-soluble binder and Fe55 powder were mixed at a volume fraction ratio of 0.3:1. Fe55 powder: Hall flow rate is 0.50 s / g, bulk density is 3.8g / cm 3 , the hardness is 23-27HRC, the mass percentage of Cr is 18.00%, Ni is 3.00%, B is 2.60%, Si is 3.50%, C is 1.20%, and Fe is the balance.

[0031] (2) Pre-treatment of the surface of the austenitic stainless steel base material, the process is: the base material is 1Cr18Ni9Ti austenitic

[0032] The body stainless steel first uses 180# metallographic sandpaper to polish the surf...

Embodiment 2

[0043] (1) Manufacture of three-dimensional space stacking mesh additives: knead nickel powder and water-soluble binder to form a mixture, extrude the mixture into metal wires with a diameter of 0.25~1.0mm through spinning nozzles, and weave them into Three meshes with different spacing, the spacing is 0.25, 0.5, 1.0mm respectively.

[0044] (2) Pre-treatment of the surface of the austenitic stainless steel substrate: firstly polish the surface of the austenitic stainless steel substrate 1Cr18Ni9Ti to be clad, and then clean it with absolute ethanol;

[0045] (3) Laser cladding material preparation: put the metal powder in an oven and dry it at a temperature of 100-150°C for 1-2 hours. After natural cooling, add it to the powder feeder, and coat it on the preset surface by synchronous powder feeding. On the surface of the austenitic stainless steel substrate with three-dimensional space stacking mesh, the powder feeding rate is 0.2g / s, and the thickness of the coating reaches ...

Embodiment 3

[0050] (1) Manufacture of three-dimensional space stacking mesh additives: knead chromium powder and water-soluble binder to form a mixture, extrude the mixture into metal wires with a diameter of 0.25~1.0mm through spinning nozzles, and weave them into Three meshes with different spacing, the spacing is 0.25, 0.5, 1.0mm respectively.

[0051] (2) Pre-treatment of the surface of the austenitic stainless steel substrate: firstly polish the surface of the austenitic stainless steel substrate 1Cr18Ni9Ti to be clad, and then clean it with absolute ethanol;

[0052] (3) Laser cladding material preparation: Put the chrome powder in an oven and dry it at a temperature of 100-150°C for 1-2 hours. After natural cooling, add it to the powder feeder, and coat it on the preset surface by synchronous powder feeding. On the surface of the austenitic stainless steel substrate with three-dimensional space stacking mesh, the powder feeding rate is 0.2g / s, and the thickness of the coating reach...

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Abstract

The invention relates to a laser cladding technology of a high-power multimode transverse flow CO2 laser, and in particular relates to a laser cladding surface modification technology. In the invention, a tridimensional space stacking net manufactured by extrusion moulding of iron-based powder and spinning is added onto the surface of a substrate, and laser cladding is carried out, so as to form a laser cladding coating of the tridimensional space stacking net additive. The invention aims at reducing stress value of the cladding coating and fully controlling cracks in the cladding coating and belongs to the technical fields of surface modification and material processing. The laser cladding coating of the tridimensional space stacking net additive provided by the invention can be well combined with the substrate, no defect such as crack, pore, inclusion and the like is produce, and no environmental pollution is produced.

Description

technical field [0001] The present invention relates to the utilization of high-power multi-mode cross-flow CO 2 Laser cladding technology, especially related to laser cladding surface modification technology. Background technique [0002] In recent years, with the development of laser cladding technology, remarkable results have been achieved. But the most difficult problem in laser cladding at present is the coating crack, which hinders the rapid industrialization of laser cladding technology. At home and abroad, a lot of research has been carried out on the formation mechanism, control and treatment methods of laser cladding coating cracks through cladding powder composition, matrix material selection, changing laser cladding process parameters, heat treatment and other methods. [0003] After literature search, for example: Tan Wen (see Tan Wen, Liu Wenjin, Jia Junhong. Metal Heat Treatment, 2000, 1(1): 15-17) used Fe-C-Si-B powder pre-prepared on the gray cast iron su...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C24/08B23K26/34
Inventor 曾维华刘洪喜蒋业华纪升伟张忠
Owner KUNMING UNIV OF SCI & TECH
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