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Excavating blade, excavating tool and method for manufacturing excavating blade

A blade and tool technology, applied in the field of excavation tools and excavation blade manufacturing, can solve the problems of easy cracking, poor thermal expansion coefficient, insufficient wear resistance and defect resistance, etc.

Active Publication Date: 2020-06-23
MITSUBISHI MATERIALS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] However, compared with cemented carbide, polycrystalline diamond sintered body has high wear resistance, but low toughness, so it has poor defect resistance, and often causes sudden chipping and defects in the hard layer during excavation of superhard rock formations
In addition, diamond sintered compacts cannot be used due to their high compatibility in Fe-based or Ni-based mines.
In addition, the heat-resistant temperature of diamond sintered compacts is about 700°C, so diamond sintered compacts cannot be used when exposed to temperatures higher than this temperature.
For example, under excavation conditions where the temperature is as high as 700°C or higher, such as open pit mining in a dry environment, wear resistance decreases due to graphitization of diamond
[0012] In addition, the cubic boron nitride sintered body has low affinity for Fe-based or Ni-based mines, but is inferior in hardness compared to diamond
In the cubic boron nitride sintered body described in Patent Document 4, cracks tend to occur due to the difference in thermal expansion coefficient between the metal binder phase and the cubic boron nitride sintered body under the above-mentioned excavation conditions of 700°C or higher.
In addition, the cubic boron nitride sintered body described in Patent Document 5 has low hardness and insufficient wear resistance and fracture resistance, so it is difficult to apply it to excavation tools.
In addition, in such a cubic boron nitride sintered body, when the amount of cubic boron nitride particles contained in the sintered body is increased in order to increase the hardness, the cubic boron nitride particles are in contact with each other, resulting in failure to bond with the binder phase. Fully reacted unsintered fraction increases
Therefore, there is a problem that the hardness corresponding to the content of cubic boron nitride particles cannot be obtained.

Method used

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  • Excavating blade, excavating tool and method for manufacturing excavating blade
  • Excavating blade, excavating tool and method for manufacturing excavating blade
  • Excavating blade, excavating tool and method for manufacturing excavating blade

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0092] First, as Example 1, an example of a cBN sintered body constituting the outermost layer was given to demonstrate the effects of the present invention.

[0093] Using cBN particles having a median diameter (D50) shown in Table 1 as a substrate, an AlN film having an average film thickness shown in Table 1 was coated on the cBN particles by the ALD method. Specifically, first, cBN particles were put into a furnace, and the temperature in the furnace was raised to 350°C. Next, as a film-forming gas, Al(CH 3 ) 3 Gas and NH as reactive gas 3 gas, and the following (1) to (4) are regarded as one cycle, and this cycle is repeated until the AlN film reaches the target film thickness.

[0094] (1)Ar+Al(CH 3 ) 3 Gas inflow process

[0095] (2) Ar gas purging process

[0096] (3)Ar+NH 3 Gas inflow process

[0097] (4) Ar gas purging process

[0098] The cBN particles were observed by SEM, and it was confirmed that the surface of the cBN particles was coated with an AlN f...

Embodiment 2

[0121] Next, an example in which the above-mentioned cBN sintered body is applied to an excavating blade of the outermost layer is given as Example 2 to demonstrate the effect of the present invention.

[0122] The powder of cBN particles with a particle size of 4.1 μm after the same pretreatment as in Example 1, the raw material powder of the binder phase, that is, TiN powder with a particle size of 0.5 μm, Al powder with a particle size of 0.3 μm, and Al powder with a particle size of 0.5 μm. TiAl 3 The powder and the cBN particle powder content when the total amount of the WC powder with a particle size of 0.8 μm is regarded as 100% by volume were blended so that the ratios in Table 7 were obtained, wet mixing was carried out, and then dried. In this way, the raw material powders of the outermost layers of Examples 1 to 4 of the present invention were obtained. The non-pretreated cBN powder with a particle size of 9.6 μm, the W powder with a particle size of 4 μm, the Al p...

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Abstract

The excavating blade of the present invention has a blade body, the blade body has a front end portion that becomes thinner toward the front end side, a hard layer is formed on the surface of the front end portion of the blade body, and the outermost layer of the hard layer has a thickness of 70 to 70 Å. In a cBN sintered body containing 95% by volume of cBN particles, when the cross-sectional structure of the outermost layer is observed, a bonded phase having a width of 1 nm to 30 nm, containing Al, B, and N, and having a ratio of O content to Al content of 0.1 or less exists in the between adjacent cBN particles.

Description

technical field [0001] The present invention relates to a digging blade mounted on a front end of a digging tool for digging, the digging tool with the digging blade mounted on the front end, and a method of manufacturing the digging blade. [0002] This application claims priority based on Patent Application No. 2016-084176 for which it applied in Japan on April 20, 2016, and uses the content here. Background technique [0003] As such an excavating blade, there is known a sintered diamond in which the tip of the base body of the blade body made of cemented carbide is covered with polycrystalline diamond harder than the blade body in order to achieve a longer life of the drill for percussion excavation. Digging blades made of hard layers. For example, Patent Document 1 proposes that the above-mentioned front end portion of the blade body having a cylindrical rear end portion and a hemispherical front end portion whose outer diameter gradually decreases toward the front end...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B10/46B22F7/00C04B35/58C04B41/89E21C35/183
CPCC04B41/89C04B35/58E21C35/183E21B10/46C22C26/00C22C2026/003C22C2026/008C22C2026/006C22C2026/007C23C16/45525C23C16/01C23C16/34C23C16/56E21B10/5673B22F7/00
Inventor 瓦多约·阿罕默迪·埃科矢野雅大松尾俊彦赤星祐树竹内悠一郎
Owner MITSUBISHI MATERIALS CORP
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