Direct laser synthesis and making process of hard alloy coating

A cemented carbide, laser direct technology, applied in laser welding equipment, metal material coating process, coating and other directions, can solve the problems of composite coating cracks and pores, interface microcracks, unusability, etc., to overcome the shape limitation. Limiting and processing difficulties, solving porosity and crack problems, and extending the effect of use

Inactive Publication Date: 2003-05-14
TSINGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Increasing the proportion of carbides in self-fluxing alloys within a certain range will improve the performance of metal matrix composite coatings, but usually when the proportion of carbides exceeds about 65%, the composite coatings obtained by laser cladding will have serious cracks and porosity and other defects, making it unusable
Laser direct cladding of WC/Co, TiC/Co, (WC-SiC)/Co, (WC-TiN-SiC)/Co, (WC-TiC-SiC)/Co, (WC-TiC-SiC)/Co , (WC-TiC-SiC)/Co, WC-TiC-TaC and other cemented carbide powders can obtain cemented carbide coatings, but there are often the following problems: (1) Laser cladding cemented carbide powders, especially small particles of hard alloys (2) When laser cladding small particles of cemented carbide

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Example 1: Laser direct synthesis and near forming to manufacture cemented carbide coatings are implemented on the tool.

[0023] Cemented carbide tools are general-purpose tools with a large quantity and a wide range. Usually, the cemented carbide powder is sintered at high temperature and high pressure into a specific shape, and then inlaid or welded on the tool steel or die steel substrate to make the tool. The raw materials are precious metals, the high temperature and high pressure sintering process is difficult, the process is complicated, the tool manufacturing process is complicated, the cost of fine grinding and the investment in processing equipment are high, and the price remains high, which greatly limits its current situation in my country. Promote applications.

[0024] Applying the technology of the present invention to the field of cutting tools, the cutting edge of cemented carbide cutting tools can be produced by direct near forming on the tool base materi...

Embodiment 2

[0033] Example 2: Laser direct synthesis to manufacture a cemented carbide coating is implemented on the mold.

[0034] The technology of the present invention is implemented in the field of molds, and the implementation process is as follows:

[0035](1) Reserve a surface to be hardened with a thickness of about 0.1-0.5mm on the local wear-resistant surface of the mold according to its shape requirements, and clean it with acetone and alcohol for later use.

[0036] (2) Place the above-mentioned mold to be hardened surface on a three-dimensional numerical control linkage laser processing machine tool, and lead the laser working head to the top of the mold to be hardened surface, and the distance between the laser working head and the mold to be hardened surface is 2-20mm;

[0037] (3) Using pure W powder, C and Ni coating powder, purity>95%, particle size is 100 mesh, according to atomic percentage: W and C are 80% (W:C=0.6:1), Ni is 20% For mixing, add 80wt% WC / Co powder (with a...

Embodiment 3

[0042] Example 3: Laser direct synthesis of cemented carbide coating for surface strengthening of parts

[0043] The technology of the present invention is applied to the surface strengthening of parts, the implementation process is as follows:

[0044] (1) Reserve a surface to be hardened with a thickness of about 0.1-0.5mm on the surface of the part according to its shape requirements, and clean it with acetone and alcohol for later use.

[0045] (2) Put the above-mentioned parts to be strengthened surface on a three-dimensional numerical control linkage laser processing machine tool, and lead the laser working head to the top of the mold to be hardened surface, and the distance between the laser working head and the mold to be hardened surface is 2-20mm;

[0046] (3) Using pure W powder, C powder, and NiCrSiB powder, the purity is more than 95%, the particle size is 300 mesh, and the atomic ratio of W and C is 70% (W:C=2.5:1) and NiCrSiB is 30% in atomic ratio. Then add 50wt% W...

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Abstract

The present invention relates to a direct laser synthesis and making process of hard alloy coating, and belongs to the field of hard alloy making and applying technology. By means of the hard alloy forming material system and high-energy laser to produce special physical and chemical metallurgical and fast solidification characteristic, hard alloy coating is formed directly through reaction in melting bath. The hard coating is dense, gas hole free and without crack and other faults, combines metallurgically with the base material, has the components, micro structure and performance of the hard alloy and any required shape. The coating may be formed in the surface of various engineering metal parts, and may be used widely in hard alloy cutter, mold antiwear part, etc.

Description

Technical field: [0001] The invention relates to a new method for laser direct synthesis and manufacturing of cemented carbide coatings, belonging to cemented carbide manufacturing and application [0002] Technical field. Background technique: [0003] Cemented carbide is a refractory metal carbide (tungsten carbide, titanium carbide, tantalum carbide, niobium carbide, vanadium carbide, etc.) as the base, cobalt or nickel as the bonding metal, and alloy materials manufactured by powder metallurgy. High hardness, good wear resistance and corrosion resistance, good red hardness, high chemical and thermal stability, high compressive strength and low expansion coefficient. It is used in metal cutting tools, molds, mining, oil drilling, geological exploration and national defense and military industries. And other fields have been widely used. Cemented carbide is usually sintered and pressed into a specific shape by high temperature and high pressure, and then inlaid or welded on too...

Claims

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Application Information

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IPC IPC(8): C23C24/10
Inventor 钟敏霖刘文今陈艳霞李汉华
Owner TSINGHUA UNIV
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