Carbide-reinforced Mo2NiB2 metal ceramic and preparation method thereof

A cermet and carbide technology, which is applied in the field of carbide-reinforced Mo2NiB2 cermet and its preparation, can solve the problem that the research on cermet materials has not been reported, and achieve the effects of short preparation cycle, simple process and high material utilization rate

Active Publication Date: 2015-09-16
SHAANXI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the in situ reaction is used to generate carbides to strengthen Mo 2 NiB 2 Research on cermet materials has not been reported yet

Method used

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  • Carbide-reinforced Mo2NiB2 metal ceramic and preparation method thereof

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preparation example Construction

[0025] The carbide reinforced Mo provided by the present invention 2 NiB 2 A method for preparing a cermet material, comprising the following steps:

[0026] 1) Use Mo powder, B powder, Ni powder and graphite powder with a purity of not less than 99.9% as the main raw materials, and the mass ratio is Ni:B:Mo:C=(21~45):6:(44~63) : (5~10) For batching, the particle size of Mo powder and graphite powder is required to be ≤20 μm, and the particle size of B powder and Ni powder is ≤50 μm.

[0027] Put Mo powder and graphite powder into a high-energy ball mill tank, fill it with argon gas and carry out mechanical alloying for 24.5-25.5 hours, then add B powder and Ni powder, and mix for 5-10 hours to obtain a mixed powder.

[0028] 2) Take out the mixed powder, and perform compression molding in a metal mold to obtain a green body, and the molding pressure is 150-300 MPa.

[0029] Put the molded green body into a vacuum sintering furnace for pressureless sintering, the vacuum deg...

Embodiment 1

[0033] 1) Use Mo powder, B powder, Ni powder and graphite powder with a purity of not less than 99.9% as the main raw materials. The particle size of Mo powder and graphite powder is required to be ≤20 μm, and the particle size of B powder and Ni powder is ≤50 μm. According to the mass ratio: Ni:B:Mo:C=41:6:48:5 for batching.

[0034] Put Mo powder and graphite powder into a high-energy ball mill tank, fill it with argon gas and carry out mechanical alloying for 25 hours, then add B powder and Ni powder, and mix for 10 hours to obtain a mixed powder.

[0035] 2) Take out the mixed powder, and perform compression molding in a metal mold to obtain a green body, and the molding pressure is 150 MPa.

[0036] Put the molded green body into a vacuum sintering furnace for pressureless sintering, the vacuum degree is ≤10 -2 Pa, from room temperature to the sintering temperature of 1240°C at a heating rate of 10°C / min, after reaching the sintering temperature without heat preservation...

Embodiment 2

[0039] 1) Use Mo powder, B powder, Ni powder and graphite powder with a purity of not less than 99.9% as the main raw materials. The particle size of Mo powder and graphite powder is required to be ≤20 μm, and the particle size of B powder and Ni powder is ≤50 μm. According to the mass ratio: Ni:B:Mo:C=32.7:6:53.3:8 for batching.

[0040] Put Mo powder and graphite powder into a high-energy ball mill tank, fill it with argon gas and carry out mechanical alloying for 25 hours, then add B powder and Ni powder, and mix for 10 hours to obtain a mixed powder.

[0041] 2) Take out the mixed powder, and perform compression molding in a metal mold to obtain a green body, and the molding pressure is 180 MPa.

[0042] Put the molded green body into a vacuum sintering furnace for pressureless sintering, the vacuum degree is ≤10 -2 Pa, from room temperature to the sintering temperature of 1260°C at a heating rate of 10°C / min, after reaching the sintering temperature without heat preserva...

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Abstract

The invention discloses a carbide-reinforced Mo2NiB2 metal ceramic and a preparation method thereof. The preparation method comprises the following steps: proportioning Mo powder, B powder, Ni powder and graphite powder in a Ni:B:Mo:C mass ratio of (21-45):6:(44-63):(5-10), filling the Mo powder and graphite powder into a ball milling tank, charging inert gas, carrying out mechanical alloying, adding the B powder and Ni powder, and uniformly mixing to obtain mixed powder; and putting the mixed powder into a mold, carrying out compression molding compression molding to obtain a billet, putting the billet into a vacuum sintering furnace, carrying out nonpressure sintering at 1200-1400 DEG C, and carrying out furnace cooling to obtain the carbide-reinforced Mo2NiB2 metal ceramic. The method has the advantages of short preparation period, simple procedure, high material utilization ratio and low cost. The prepared carbide-reinforced Mo2NiB2 metal ceramic has the advantages of compact structure and favorable mechanical properties, and has favorable application prospects.

Description

technical field [0001] The invention belongs to the technical field of cermet materials and powder metallurgy, relates to a composite ceramic material, in particular to a carbide-reinforced Mo 2 NiB 2 Cermets and methods for their preparation. Background technique [0002] Cermets are an important class of ceramic materials in modern industry. The development of cermets plays a decisive role in the development of aerospace, aviation, automobile and energy industries. At present, the high-temperature structural materials widely used in turbine engines, jet engines and heat exchangers are nickel-based superalloys, but the current service temperature of nickel-based superalloys (~1100°C) has reached 85% of its melting point, that is, Nickel-based superalloys have been difficult to meet the requirements of further increasing the operating temperature of the system. At the same time, with the rapid development of aerospace and advanced energy industries, higher and more string...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C29/14C22C1/05
Inventor 李文虎艾桃桃于琦邹祥宇徐峰冯小明
Owner SHAANXI UNIV OF TECH
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