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Preparation method of titanium alloy grading powder laser cladding layer and titanium alloy with same cladding layer

A laser cladding and titanium alloy technology, applied in the field of titanium alloy and titanium alloy graded powder to prepare laser cladding layer, can solve the problems that the external lubricating oil and grease cannot meet its requirements, and there is no new technology application, etc., to achieve expansion The effect of using the range

Inactive Publication Date: 2018-03-06
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Under such harsh conditions, conventional external lubricating oil and grease cannot meet its requirements
This requires that the parts themselves have good wear resistance and excellent self-lubricating properties, so these shortcomings of titanium alloys limit its application to a certain extent
However, there is no report on the application of this new technology to titanium alloys.

Method used

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  • Preparation method of titanium alloy grading powder laser cladding layer and titanium alloy with same cladding layer
  • Preparation method of titanium alloy grading powder laser cladding layer and titanium alloy with same cladding layer
  • Preparation method of titanium alloy grading powder laser cladding layer and titanium alloy with same cladding layer

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preparation example Construction

[0030] The preparation method of the present invention will be described in detail below in conjunction with specific embodiments.

[0031] The concepts mentioned in the present invention are explained as follows:

[0032] Graded Powder: Refers to alloy powders of different particle size ranges mixed in a certain proportion and then used as a base or mixed powder for other purposes. The proportion varies according to the specific material design.

[0033] Raw Powder: Refers to the alloy powder produced directly from alloy materials without direct external intervention in particle size distribution.

example 1

[0043] 1) Select TC4 titanium alloy as the base material, cut it into a test block with a size of 30mm×60mm×7mm with a wire cutting machine, use 600-mesh sandpaper to remove the surface scale, and then use absolute ethanol to clean the oil and rust on the surface ;

[0044] 2) Mix 50wt% of nickel-coated boron carbide powders with particle size grades of 23μm<d≤45μm and 45μm<d≤75 respectively to obtain graded powder, which is mixed with TC4 alloy powder at a mass percentage of 20% , by mechanical mixing until uniformly mixed. The cladding material is preset on the treated test block with an organic binder, and the preset thickness is about 1.0 mm. Use a 101-3AB electric blast drying oven to dry at 140°C for 3 hours;

[0045] 3) Using a high-power semiconductor laser for cladding, a rectangular laser spot of 3×12 is selected, the laser power is 4kw, the scanning speed is 10mm / s, and the argon gas protection is used to carry out laser cladding on the pre-coated test block to ob...

example 2

[0050] 1) Select TC4 titanium alloy as the base material, cut it into a test block with a size of 30mm×60mm×7mm with a wire cutting machine, use 600-mesh sandpaper to remove the surface scale, and then use absolute ethanol to clean the oil and rust on the surface trace;

[0051] 2) Mix 50wt% of nickel-coated boron carbide powders of 45μm<d≤75μm and 75μm<d≤96μm screened out by molecular sieves to obtain graded powder, which is phased with TC4 alloy powder at a mass percentage of 20% Mix, by mechanical mixing until uniformly combined. The cladding material is preset on the treated test block with an organic binder, and the preset thickness is about 1.0 mm. Use a 101-3AB electric blast drying oven to dry at 140°C for 3 hours;

[0052] 3) High-power semiconductor lasers are used for cladding, with a rectangular laser spot of 3mm×12mm, laser power of 4kw, scanning speed of 10mm / s, and argon gas protection. Laser cladding was performed on the pre-coated test block to obtain a las...

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Abstract

The invention discloses a preparation method of a titanium alloy grading powder laser cladding layer. The method comprises the following steps: 1) preprocessing a base titanium alloy material; and removing oxide skin, greasy dirt and rust on the surface; 2) sieving to grade 70 Ni cladded B4C powder being 5-140 microns in particle size; 3) mixing the graded powder at different particle size grade to prepare 70 Ni cladded B4C grading powder; 4) uniformly mixing the 70 Ni cladded B4C grading powder and TC4 powder based on ratio so as to obtain cladding mixing coating grading powder; and 5) prearranging the cladding mixing coating grading powde4 on the surface of the base titanium alloy material; and performing laser cladding on a test block with the cladding mixing coating grading powder through 3*12mm, 3*24mm, 6*12mm or 6*24mm rectangular wide spots under the conditions that the power is 2-8kw, the scanning speed is 5-20mm / s and the argon protection environment is provided, thus obtaining the titanium alloy grading powder laser cladding layer. The cladding layer prepared through the method is high in hardness, high in durability and high in self-lubricating performance.

Description

technical field [0001] The invention relates to the field of laser cladding, in particular to a method for preparing a laser cladding layer from titanium alloy graded powder and a titanium alloy with the cladding layer. Background technique [0002] Titanium alloys have the advantages of high specific strength, excellent corrosion resistance and heat resistance, and good biocompatibility, and are widely used in aerospace, petrochemical, and biomedical engineering. However, its hardness and friction coefficient are low, and it is difficult to self-lubricate, so its wear resistance is not ideal. With the development of modern science and technology, some relatively moving parts are required to work for a long time under special working conditions such as high temperature, high vacuum, strong corrosion and strong radiation. Under such severe conditions, conventional external lubricating oil and grease cannot meet its requirements. This requires that the parts themselves have ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C24/10
CPCC23C24/103
Inventor 胡春亮孙荣禄林熙牛伟雷贻文
Owner TIANJIN POLYTECHNIC UNIV
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