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Preparation method of hard alloy with clad structure

A technology of cemented carbide and cladding structure, which is applied in the field of preparation of clad cemented carbide, can solve problems such as complex process, inconsistent carbon content of core and shell, and performance deterioration, so as to simplify the process flow, save production time, The effect of improving mechanical properties

Inactive Publication Date: 2011-11-23
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is difficult to prepare materials with good comprehensive properties by traditional technology. One of the solutions is to manufacture cladding or cladding structural materials
There are many processes for manufacturing cladding structures or cladding materials, such as chemical vapor deposition (CVD), physical vapor deposition (PVD), laser cladding, thermal spraying, self-propagating high-temperature synthesis, sol-gel technology, etc., but these The process has the following disadvantages to varying degrees: the thickness of the coating structure or coating is thin and the bonding strength with the substrate is low, the reliability of the material is not ideal, the investment in equipment is large, and the process is complicated, etc.
Therefore, it is easy to cause inconsistent carbon content in the core and shell, which exceeds the allowable range and leads to performance deterioration
And this problem is more difficult to control for different shell thicknesses

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0027] Example 1 Preparation process of cladding structure cemented carbide with WC-0.5Co as the matrix and WC-0.5C-TiN as cladding material

[0028] a. Preparation of binder: by weight percentage, 30% of paraffin wax, 30% of polyethylene, 30% of beeswax, and 10% of stearic acid are placed in a blade mixer and mixed for 1 hour at a temperature of 150°C to prepare a binder ;

[0029] b. Preparation of feed material: The binder and WC-0.5Co powder are mixed according to the volume ratio of 50%:50% in a mixer at a temperature of 160°C for 2 hours to obtain the base material feed of WC-0.5Co. Mix the binder and WC-0.5Co-TiN powder in a volume ratio of 55%:45% in a mixer at 160°C for 2 hours to obtain TiN coating material feed; WC-0.5Co feed The viscosity ratio with WC-0.5Co-TiN feed is 0.2:1;

[0030]c. Injection molding: Utilize the co-injection molding machine to inject the coating material feed into the mold cavity first, the injection amount of the coating material feeding i...

example 2

[0033] Example 2 is based on WC-10Co, WC-10Co-5Ti 0.5 Al 0.5 Preparation process of cladding structure cemented carbide with N as cladding material

[0034] a. Preparation of binder: by weight percentage, take 40% of paraffin wax 20%, polyethylene 40%, beeswax 35%, and stearic acid 5%, put it in a blade mixer, and mix it at 105°C for 2 hours to prepare the binder ;

[0035] b. Preparation of feed material: mix binder and WC-10Co powder according to the volume ratio of 40%: 60% in a mixer at 160°C for 2 hours to obtain WC-10Co matrix material feed, and paste Binder and WC-10Co-5Ti 0.5 C 0.5 N powder was mixed in a mixer at a temperature of 160°C for 2 hours at a volume ratio of 55%:45% to obtain WC-10Co-5Ti 0.5 C 0.5 N cladding material feed; WC-10Co feed and WC-10Co-5Ti 0.5 C 0.5 The viscosity ratio of N feed is 0.9:1;

[0036] c. Injection molding: use a co-injection molding machine to inject the coating material feed into the mold cavity first, and the injection amo...

example 3

[0039] Example three uses WC-40Co as the matrix, WC-40Co-3Ti 0.5 Cr 0.2 Preparation process of cladding structure cemented carbide with VHfC as cladding material

[0040] a. Preparation of binder: by weight percentage, take 20% of paraffin wax, 40% of polyethylene, 39% of beeswax, and 1% of stearic acid, put them in a blade mixer, and mix at a temperature of 160°C for 1.5h;

[0041] b. Preparation of feed material: The binder and WC-40Co powder are mixed according to the volume ratio of 50%:50% in a mixer at a temperature of 140°C for 2 hours to obtain the WC-40Co matrix material feed. Binder and WC-40Co-3Ti 0.5 Cr 0.2 VHfC powder was mixed in a mixer at a temperature of 150°C for 2 hours according to the volume ratio of 40%:60% to obtain WC-40Co-3Ti 0.5 Cr 0.2 VHfC coating material feed; WC-40Co feed and WC-40Co-3Ti 0.5 Cr 0.2 The viscosity ratio of VHfC feed is 1.8:1;

[0042] c. Injection molding: use co-injection molding machine to inject the coating material feed ...

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Abstract

The invention relates to a preparation method of a hard alloy with a clad structure, comprising the following steps of: selecting a WC-Co-based hard alloy as a base material; selecting a multicomponent alloy to which TiN, TiC and Al2O3 or TiC and TiN are added from WC-Co-based hard alloys as a cladding material; respectively obtaining a base material feed and a cladding material feed by mixing and granulating; sequentially injecting the cladding material feed and the base material feed into a mold cavity by coinjection molding to obtain a product billet; and performing solvent degreasing and hot degreasing processes on the product billet, and sintering after removing a binder to obtain the hard alloy product with the clad structure. The method provided by the invention has a simple process, simplicity of operation, short consumed time and good binding property between the shell and the base matrix, can flexibly adjust the shell thickness by selecting different shell materials and controlling the coinjection process parameters, effectively improves the mechanical and physical properties of the surface of a mechanical part, and is suitable for preparation of a hard alloy workpiece with a clad structure.

Description

technical field [0001] The invention discloses a preparation method of coated hard alloy, which belongs to the technical field of metal powder co-injection molding preparation. Background technique [0002] With the rapid development of science and technology, higher requirements are put forward for the field of materials. When manufacturing certain parts, materials are required to have high strength, toughness, high hardness, good wear resistance and corrosion resistance, etc. It is difficult to prepare materials with good comprehensive properties by traditional techniques. One of the solutions is to manufacture cladding or cladding structural materials. There are many processes for manufacturing cladding structures or cladding materials, such as chemical vapor deposition (CVD), physical vapor deposition (PVD), laser cladding, thermal spraying, self-propagating high-temperature synthesis, sol-gel technology, etc., but these The processes have the following disadvantages to...

Claims

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Application Information

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IPC IPC(8): B22F3/115
Inventor 何浩李益民王光耀
Owner CENT SOUTH UNIV
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