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Diamond cutting tool based on rare earth modified iron-based binding agent and preparation method of diamond cutting tool

An iron-based binder and rare earth modification technology, which is applied to other manufacturing equipment/tools, engine components, turbines, etc., can solve the problems of poor wettability of diamonds, improve the encasement strength, reduce thermal damage, and increase wear resistance sexual effect

Active Publication Date: 2021-10-01
CHINA UNIV OF GEOSCIENCES (WUHAN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the wettability of iron to diamond is poor, mainly relying on the difference in thermal expansion of the two during the sintering process to encase the diamond

Method used

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  • Diamond cutting tool based on rare earth modified iron-based binding agent and preparation method of diamond cutting tool
  • Diamond cutting tool based on rare earth modified iron-based binding agent and preparation method of diamond cutting tool
  • Diamond cutting tool based on rare earth modified iron-based binding agent and preparation method of diamond cutting tool

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) Mix 30-40 mesh synthetic diamonds with a metal bond at a volume ratio of 1:5 to obtain a mixed powder. The metal bond includes 94.5% of Fe70Cu30 pre-alloyed powder, 5.0% of Ni50Cr50 pre-alloyed powder, and 0.5% of praseodymium (mass Fraction);

[0026] (2) After putting the mixed powder into a graphite mold, carry out hot-press sintering, the sintering temperature is 960°C, the sintering pressure is 13MPa, and the heat preservation is 3 minutes to obtain the diamond cutting unit;

[0027] (3) The diamond cutting unit is fixed on the steel body of the saw blade by brazing to make a diamond saw blade.

[0028] The holding force coefficient of the diamond cutting unit carcass obtained in Example 1 is 0.538, and the diamond impact strength is 0.889.

Embodiment 2

[0030] (1) Mix 40-50 mesh synthetic diamonds with metal bonding agent at a volume ratio of 1:4 to obtain a mixed powder. The metal bonding agent includes 89.2% of Fe70Cu30 pre-alloyed powder, 10.0% of Ni50Cr50 pre-alloyed powder, and 0.8% of praseodymium (mass fraction );

[0031] (2) After putting the mixed powder into a graphite mold, carry out hot-press sintering, the sintering temperature is 1000° C., the sintering pressure is 15 MPa, and the heat preservation is 5 minutes to obtain the diamond cutting unit;

[0032] (3) The diamond cutting unit is fixed on the steel body of the drill bit by welding to make a diamond drill bit.

[0033] The diamond holding force coefficient of the cutting tooth matrix obtained in Example 2 is 0.539, and the diamond impact strength is 0.875.

[0034] Such as figure 1 with figure 2 , from the energy spectrum of the cutting unit carcass surface, it can be seen that Pr can promote the formation of solid solution between Cu and Cr, and impr...

Embodiment 3

[0036] (1) Mix 50-60 mesh synthetic diamonds with a metal bond at a volume ratio of 3:10 to obtain a mixed powder. The metal bond includes 84.0% of Fe70Cu30 pre-alloyed powder, 15.0% of Ni50Cr50 pre-alloyed powder, and 1.0% of praseodymium (mass fraction );

[0037] (2) After putting the mixed powder into a graphite mold, carry out hot-press sintering, the sintering temperature is 1100°C, the sintering pressure is 18MPa, and the heat preservation is 6 minutes to obtain the diamond cutting unit;

[0038] (3) The diamond cutting unit is directly hot-pressed and sintered on the steel body of the drill bit to make a diamond drill bit.

[0039] The diamond holding force coefficient of the cutting tooth carcass obtained in Example 3 is 0.577, and the diamond impact strength is 0.867.

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Abstract

The invention discloses a diamond cutting tool based on a rare earth modified iron-based binding agent. The diamond cutting tool is prepared from artificial diamond with the particle size of 30-200 meshes and a metal binding agent, and the metal binding agent is prepared from the following raw materials in percentage by mass: 60-95% of Fe70Cu30 pre-alloyed powder, 5-40% of Ni50Cr50 pre-alloyed powder and 0.1-1.2% of pure praseodymium powder. The invention further discloses the diamond cutting tool based on the rare earth modified iron-based binding agent. The heat damage of the diamond in the sintering process can be reduced, the embedding strength of a matrix to the diamond is improved, the wear resistance of the cutting tool is improved, and the service life of the diamond cutting tool is prolonged.

Description

technical field [0001] The invention relates to the technical field of cutting tools. More specifically, the present invention relates to a diamond cutting tool based on a rare earth modified iron-based binder and a preparation method thereof. Background technique [0002] Diamond tools are widely used in geological exploration, building restoration construction, superhard material processing and other fields. The commonly used diamond tool matrix includes tungsten carbide base and cobalt base. The tungsten carbide base matrix has high mechanical properties. The diamond is wrapped by mechanical inlay. However, the high hardness of tungsten carbide leads to poor self-sharpening; while the cobalt matrix has excellent formability and sinterability, and has good wettability to diamond, the bonding strength of diamond and matrix is ​​high, and self-sharpening is good. , was once considered to be the most excellent carcass in the field of diamond tools. However, cobalt is an imp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/00B22F3/14B22F5/00B22F7/08C22C33/02C22C26/00C22C30/02C22C1/05C22C38/42
CPCB22F3/14B22F5/00B22F7/08C22C33/0207C22C33/0278C22C26/00C22C30/02C22C1/05C22C38/42C22C38/005B22F2005/001
Inventor 石恒超谭松成段隆臣方小红杨展周燕
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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