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Multistage composite metal ceramic, preparation method of multistage composite metal ceramic and shield cutter

A composite metal and ceramic technology, applied in mining equipment, earthwork drilling, tunnels, etc., can solve the problems of short life and low wear resistance of rock drilling tools

Active Publication Date: 2016-10-12
广东金瓷三维技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the cermets in the shield field are mainly traditional cermets with coarse grains and uniform structure. The WC grains are larger than 10 μm. Although the fracture toughness is high, the wear resistance is very low, which is the root cause of the short life of rock drilling tools.

Method used

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  • Multistage composite metal ceramic, preparation method of multistage composite metal ceramic and shield cutter
  • Multistage composite metal ceramic, preparation method of multistage composite metal ceramic and shield cutter

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preparation example Construction

[0050] The present invention also provides a method for preparing a multi-stage composite cermet, comprising the following steps:

[0051] A) n layers of transition phase are coated on the outer layer of the wear-resistant phase to obtain aggregates, n≥1;

[0052] The hardness of the n-layer transition phase gradually decreases, and the transition phase layer contacting the wear-resistant phase has the highest hardness;

[0053] The wear-resistant phase includes AlMgB 14 -Ni 3 Al-SiC alloy;

[0054] B) mixing the pellets with the matrix and sintering to obtain a multi-level composite cermet.

[0055] In the present invention, the outer layer of the spherical powder particles of the wear-resistant phase preferably includes n layers of transition phases to obtain aggregates, n≥1. In the present invention, the outer layer of spherical powder particles of the wear-resistant phase is preferably coated with n layers of transition phases to obtain aggregates, specifically Yes, th...

Embodiment 1

[0070] Put boron powder in 1×10 -3 In a Pa vacuum furnace, heat from room temperature to 1500°C and keep it warm for 2 hours, then cool down to room temperature with the furnace; mix aluminum powder, magnesium powder and boron powder in a molar ratio of Al: Mg: B = 1:1:14 to obtain a mixture , and then the mixture was placed under 20MPa and heated to 1450°C and kept for 90min, and AlMgB was obtained after cooling 14 , the AlMgB 14 AlMgB obtained after grinding 14 Pre-reaction powder.

[0071] In terms of mass fraction, 19% of Al, 9.0% of Cr, 0.65% of Zr, 0.6% of Y, 0.6% of V, 1% of B and the rest of Ni are mixed together to obtain a mixed powder; Ball mill the mixed powder for 50 h under an inert atmosphere to obtain Ni 3 Al mixed powder.

[0072] In terms of mass fraction, 2% SiC whiskers, 4% Ni 3 Al and 94% AlMgB 14 The pre-reaction powder is mixed evenly and passed through a 100-mesh sieve, and AlMgB is prepared by adding a forming agent, wet grinding, atomizing and ...

Embodiment 2

[0076] Put boron powder in 1×10 -3 In a Pa vacuum furnace, heat from room temperature to 1500°C and keep it warm for 2 hours, then cool down to room temperature with the furnace; mix aluminum powder, magnesium powder and boron powder in a molar ratio of Al: Mg: B = 1:1:14 to obtain a mixture , and then the mixture was placed under 20MPa and heated to 1450°C and kept for 90min, and AlMgB was obtained after cooling 14 , the AlMgB 14 AlMgB obtained after grinding 14 Pre-reaction powder.

[0077] In terms of mass fraction, 19% of Al, 9.0% of Cr, 0.65% of Zr, 0.6% of Y, 0.6% of V, 1% of B and the rest of Ni are mixed together to obtain a mixed powder; Ball mill the mixed powder for 50 h under an inert atmosphere to obtain Ni 3 Al mixed powder.

[0078] In terms of mass fraction, 4% SiC whiskers, 6% Ni 3 Al and 90% AlMgB 14 The pre-reaction powder is prepared by adding a molding agent and mixing evenly, passing through a 100-mesh sieve, spraying granulation, sieving, dewaxing...

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Abstract

The invention provides a multistage composite metal ceramic. The multistage composite metal ceramic comprises a matrix phase and a plurality of aggregate distributed in the matrix phase, wherein the aggregate comprises a wear-resistant phase and n layers of transition phases coating the wear-resistant phase, and n is larger than or equal to 1; the hardness of the n layers of transition phases is gradually reduced, and the hardness of the transition phase layer making contact with the wear-resistant phase is highest; the wear-resistant phase comprises an AlMgB14-Ni3Al-SiC alloy. The AlMgB14-Ni3Al-SiC alloy is used as the ultra-hard wear-resistant phase and is surrounded in the middle of the transition phases, the ultra-hard composite metal ceramic aggregate is formed and evenly distributed in the toughening matrix phase, and the multistage composite metal ceramic adopting a special structure is obtained. The multistage composite metal ceramic has the relatively high wear resistance and the relatively high fracture toughness. The invention further provides a preparation method of the multistage composite metal ceramic and a shield cutter.

Description

technical field [0001] The invention belongs to the technical field of metallurgical processing, and in particular relates to a multi-stage composite cermet, a preparation method thereof and a shield cutting tool. Background technique [0002] In my country, tunnel boring machines used in soft ground are customarily called shield machines. Using shield machines for tunnel construction has the advantages of high degree of automation, manpower saving, fast construction speed, one-time hole formation, not affected by climate, and open tunneling. When excavating, it can control ground subsidence, reduce the impact on ground buildings, and not affect water surface traffic when excavating underwater. In the case of long tunnel lines and large buried depths, it is more convenient to use shield machines for construction. Economically sound. [0003] For the shield machine, the excavation system has a decisive influence on the construction effect of the shield machine. The excavation ...

Claims

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Application Information

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IPC IPC(8): C22C29/00C22C26/00C22C1/05E21D9/08
CPCC22C1/051C22C26/00C22C29/00E21D9/08
Inventor 邓欣陈健伍尚华刘金洋刘汝德叶文驹
Owner 广东金瓷三维技术有限公司
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