Molybdenum-cobalt-boron ternary boride base metal ceramic material and preparation method thereof

A technology of ternary borides and ceramic materials, which is applied in the field of cutting tools, can solve the problems of low self-diffusion coefficient, difficult sintering and compactness, and incomparable problems, and achieve the effects of stable chemical properties, lower sintering temperature, and improved product performance

Active Publication Date: 2018-04-13
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

TiC-based cermets, TiN-based cermets and Ti(C,N)-based cermets have low toughness and are difficult to compare with traditional WC-based cemented carbides.
Binary borides such as TiB 2 , due to its low self-diffusion coefficient, its sinterability is poor, and it is easy to react with the binder metal to form a brittle third phase during the sintering process, and it is difficult to sinter dense

Method used

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  • Molybdenum-cobalt-boron ternary boride base metal ceramic material and preparation method thereof

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preparation example Construction

[0022] A preparation method of a MoCoB type ternary boride-based cermet material of the present invention comprises the following process steps: using elemental molybdenum powder, elemental cobalt powder, and elemental boron powder as raw materials, according to a certain powder ratio, through a powder mixing process, and drying process, pressing process and sintering to obtain a ternary boride cermet material with MoCoB type double boride as the main phase.

[0023] The properties of the powder are: the purity of molybdenum powder is >99%, particle diameter (0.01~10μm); the purity of cobalt powder is >99%, particle diameter (0.01~10μm); the purity of boron powder is >99%, particle diameter (0.01~10μm).

[0024] For the powder ratio, if the atomic number of the powder ratio is MoxCoyBz, and x, y and z are the atomic numbers of the corresponding powder, it is required that 1.40≥z / x≥1.12, and 2.2≥y / x≥1.

[0025] The powder mixing process adopts a dry mixing method or a wet mixi...

Embodiment 1

[0035] Weigh Mo23.99g, Co18.87g, and B3.105g respectively; mix the materials, sieve to obtain a uniformly mixed powder, and press molding with a pressure of 250Mpa and a holding time of 120s, sintering under an argon atmosphere, and the sintering temperature At 1180°C, the holding time is 30min, the heating rate is 5°C / min, and the furnace cools down. The hard phase of the prepared sample is MoCoB dual phase, the binder phase is Co, and the sample density is 8.13g / cm 3 , Rockwell hardness can reach 83.5HRA.

Embodiment 2

[0037] Weigh Mo23.99g, Co18.87g, and B3.24g respectively; mix the materials, sieve to obtain a uniformly mixed powder, and press molding with a pressure of 250Mpa and a holding time of 120s, through a tube furnace under an argon atmosphere. Sintering, the sintering temperature is 1200°C, the holding time is 30min, the heating rate is 5°C / min, and the furnace cools down. The hard phase of the prepared sample is MoCoB dual phase, the binder phase is CoB, and the density is 8.19g / cm 3 , Rockwell hardness can reach 83.7HRA.

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Abstract

The invention discloses a molybdenum-cobalt-boron ternary boride base metal ceramic material and a preparation method thereof. The process comprises the following steps: simple-substance molybdenum powder, cobalt powder and boron powder are used raw materials for ball-mill mixing, drying, formation and sintering to prepare ternary boride base metal ceramic; a main phase is a MoCoB type diboride with an orthorhombic structure; contained hard phases are two similarly stable MoCoB phases; and bonded phases are Co or CoB compounds or solid solution of the two. The boron content (the atomic ratio B/Mo is more than 1.1) is increased in the ratio; the liquid phase appearance temperature of a ternary system is reduced; the sintering temperature is reduced; the preparation process is simplified; the cost is reduced; more excellent phase structures can be obtained through low-temperature sintering; and the oriented growth of grains is prevented. The Rockwell hardness is not lower than 83.5 HRA.The material can serve as cutting tool and mold structures and structural part or wear resisting part materials, improves the toughness, the hardness and the wear resistance of metal, and is high in oxidation resistance and stable in chemical property.

Description

technical field [0001] The invention relates to a novel molybdenum-cobalt-boron ternary boride-based cermet material and a preparation method thereof, which are mainly used in the fields of cutting tools, mold materials, structural parts or wear-resistant parts materials. Background technique [0002] Cemented carbide is known as the "teeth" in industry. Because cemented carbide has a series of excellent properties, it occupies an important position in modern tool materials, wear-resistant materials, corrosion-resistant and high-temperature resistant materials, etc. The traditional cemented carbide material is WC-Co, but the massive consumption of tungsten resources is not conducive to the development of the cemented carbide industry, so seeking tungsten-free alloys is an important research direction for cemented carbides. Transition metal carbides, nitrides, and borides have high strength, hardness, wear resistance, and thermal stability and have become the main research o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C29/14C22C1/05
CPCB22F2998/10C22C1/058C22C29/005C22C29/14B22F2009/043B22F3/02
Inventor 尹海清徐志锋曲选辉刘国权张桐姜雪张聪张瑞杰
Owner UNIV OF SCI & TECH BEIJING
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