Composite material layer melted and coated on surface of titanium alloy through laser

A technology of laser cladding and composite materials, which is applied in the coating process and coating of metal materials, can solve the problems of poor dispersion, easy segregation and agglomeration, and poor thermal stability.

Inactive Publication Date: 2005-03-30
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention aims at the disadvantages of poor interfacial wettability, low bonding strength, poor dispersion, easy segregation and agglomeration, and poor thermal stability existing in the existing direct addition of reinforcing phases, thereby

Method used

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Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach 1

[0004] Embodiment 1: In this embodiment, the base material is Ti-6Al-4V, which is commonly used in aerospace structural parts, so that the Ti for in-situ reaction comes from Ti-6Al-4V. To slow down Ti and B 4 The violent degree of C reaction adopts the method that adds NiCrBSi powder, to obtain the composite coating of good quality, described NiCrBSi powder can be any kind of NiCrBSi powder sold on the market, the added B 4 C powder accounts for 2wt.%~10wt.% of NiCrBSi powder, B 4 C powder was mixed with NiCrBSi powder to prepare titanium alloy surface laser cladding coating composite material.

[0005] The preparation method of the laser cladding coating composite material on the surface of titanium alloy is to mix NiCrBSi powder with B 4 C powder is mixed in proportion, and then mixed in a drum mixer for 10 hours, and then mixed with the prepared organic binder to form a paste, which is evenly brushed on the surface of the titanium alloy workpiece, and the coating thicknes...

specific Embodiment approach 2

[0009] Embodiment 2: The base material used in this embodiment is Ti-6Al-4V, which is commonly used in aerospace structural parts. The surface of the workpiece to be clad is ground by water sandpaper, the surface roughness is Ra=0.2μm, and cleaned with acetone before cladding. The pre-coating material is NiCrBSi+5wt.%B 4 C powder. The particle size of NiCrBSi powder ranges from 50 to 80 μm, and its melting point is 1100°C. See Table 1 for its chemical composition. B 4 The particle size range of C powder is 10-30μm, and the melting point is 2700℃.

[0010] Element

Ni

Cr

B

Si

other

weight-%

65-72

14-16

5-6

4-5

4-9

[0011] The prepared pre-coated powder NiCrBSi+5wt.%B 4 C Mix the powder in a drum mixer for 10 hours, then mix it with the prepared organic binder to form a paste, brush evenly on the surface of the titanium alloy, control the thickness of the coating at about 0.8mm, and dry it at 90°C ...

specific Embodiment approach 3

[0014] Specific embodiment three: the difference between this embodiment and specific embodiment two is that in the selected NiCrBSi powder, Ni: 63-75wt.%, Cr: 15-20wt.%, B: 3-5wt.%, Si: 3~6wt.%, Fe: 3~5wt.%, C: 1wt.%, the B used 4 C powder accounts for 8wt.% of NiCrBSi powder.

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Abstract

This invention relates to a laser melt-deposition coating on titanium alloy surface. This coating material complex comprises NiCrBSi powder and B4C powder in the weight percentages of 2-10 of the above-said NiCrBSi powder. This invention material compared with prior art material has advantages of: the reinforcement phase formed in situ has excellent interface infiltration, high combination strength, excellent dispersity and thermalstability, due to the chemical reaction taking-place during the coating-prepn. procedure.

Description

Technical field: [0001] The invention belongs to the technical field of metal surface coating, and relates to a composite material for laser cladding coating on the surface of titanium alloy. Background technique: [0002] Titanium alloy has high specific strength, excellent corrosion resistance and high temperature performance, and is a high-performance material widely used in aviation and aerospace sectors. However, titanium alloy has a large friction coefficient and poor wear resistance, which limits its application range. Laser cladding is a kind of surface technology, which uses a laser beam as a heat source to weld a layer of new materials on the surface of the base material, thereby organically combining the strength and toughness of the base material with the wear resistance, corrosion resistance and oxidation resistance of the enhanced phase material. Combined, it can greatly improve the wear resistance of the metal surface. At present, the laser cladding coating ...

Claims

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Application Information

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IPC IPC(8): C22C49/11C23C24/10
Inventor 耿林孟庆武郭立新范小红
Owner HARBIN INST OF TECH
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