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Ti (C, N)-based metal ceramic with high entropy ring phase structure and preparation method thereof

A technology of phase structure and base metal, applied in the direction of metal material coating process, coating, solid-state diffusion coating, etc., can solve the problems of reducing the surface hardness and wear resistance of the tool, reducing the surface processing accuracy, increasing the process and cost, etc. , to achieve excellent wear resistance and oxidation resistance, improve oxidation resistance and red hardness, good wear resistance

Active Publication Date: 2020-10-30
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the conventional Ti(C,N)-based cermets have the following problems during service: (1) The heat caused by the rapid cutting rate in the finishing or semi-finishing process causes the oxidation of the metal and ceramic phases, reducing the surface machining accuracy; ( 2) The metal cutting material is easy to stick to the cermet when cutting at high temperature, which reduces the surface hardness and wear resistance of the tool; (3) The ceramic coating on the surface of the tool can effectively improve the above problems, but the process and cost increase

Method used

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  • Ti (C, N)-based metal ceramic with high entropy ring phase structure and preparation method thereof
  • Ti (C, N)-based metal ceramic with high entropy ring phase structure and preparation method thereof
  • Ti (C, N)-based metal ceramic with high entropy ring phase structure and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Composition: 49.9Ti(C,N)-11.4WC-6Mo 2 C-3.0VC-11.3TaC-18.0Ni-0.4C cermet.

[0045] The mass fraction of the cermet composition is 49.9 parts of Ti(C, N), 11.4 parts of WC, 6 parts of Mo 2 C, 3.0 parts of VC, 11.3 parts of TaC, 18.0 parts of binder phase Ni and 0.4 parts of carbon. The molar ratio of the four secondary carbides is: WC / Mo 2 C / VC / TaC=1.0 / 1.01 / 0.82 / 1.01.

[0046] First, the above secondary carbides and the corresponding oxides of the binder phase WO 3 / MoO 3 / V 2 o 5 / Ta 2 o 5 and NiO, and add pyrolytic carbon black required for complete carbothermal reduction, add cemented carbide balls, where the ball-to-material ratio is 20:1, and the ball milling time is 30h, and then the uniformly mixed powder is placed in an air atmosphere at 80°C Dry for 8 hours; put the mixed powder into a graphite calciner, and sinter at 1300°C for 2 hours in a high-purity argon atmosphere to obtain the desired nanocarbide-bonding phase composite powder.

[0047] The prep...

Embodiment 2

[0049] Composition: 40.7Ti(C,N)-15.5Mo 2 C-15.6ZrC-15.5NbC-12.5Co-0.2C cermet

[0050] The mass fraction of the cermet composition is 40.7 parts of Ti(C, N), 15.5 parts of Mo 2 C, 15.6 parts of ZrC, 15.5 parts of NbC, 12.5 parts of binder phase Co and 0.2 parts of carbon. Wherein the molar ratio of said 3 kinds of secondary carbides is: Mo 2 C / ZrC / NbC = 1.0 / 0.99 / 0.97.

[0051] First, the above-mentioned secondary carbides and the corresponding oxide MoO of the binder phase 3 / ZrO 2 / Nb 2 o 5 and CoO, and add pyrolytic carbon black required for complete carbothermal reduction, add cemented carbide balls, where the ball-to-material ratio is 25:1, and the ball milling time is 24h, and then the mixed powder is placed in an air atmosphere at 80°C Dry for 12 hours; put the mixed powder into a graphite calciner, and sinter at 1400°C for 3 hours in a high-purity argon atmosphere to obtain the desired nanocarbide-bonding phase composite powder.

[0052] The preparation steps of...

Embodiment 3

[0054] Element:

[0055] 32.1Ti(C,N)-21.5WC-10.7ZrC-10.1NbC-21.6TaC-3Ni-2Co-0.1C cermet.

[0056] The mass fraction of the cermet composition is 32.1 parts of Ti(C, N), 21.5 parts of WC, 10.7 parts of ZrC, 10.1 parts of VC, 21.6 parts of TaC, 3 parts of Ni, 2 parts of cobalt and 0.5 parts parts of carbon. Wherein the molar ratio of the four secondary carbides is: WC / ZrC / TaC / NbC=1.00 / 1.02 / 0.99 / 0.88.

[0057] First, the above secondary carbides and the corresponding oxides of the binder phase WO 3 / ZrO 2 / Ta 2 o 5 / Nb 2 o 5 / NiO / CoO, and adding pyrolytic carbon black required for complete carbothermal reduction, adding cemented carbide balls, wherein the ball-to-material ratio is 15:1, and the ball milling time is 48h, and then the mixed powder is placed in an air atmosphere, Dry at 80°C for 8 hours; put the mixed powder into a graphite calciner, and sinter at 1350°C for 5 hours in a high-purity argon atmosphere to obtain the desired nanocarbide-bonding phase composite p...

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Abstract

The invention discloses a Ti (C, N)-based metal ceramic with a high entropy ring phase structure and a preparation method thereof. The ring phase structure of the Ti (C, N)-based metal ceramic is a high-entropy carbide ceramic, and the composition of the Ti (C, N)-based metal ceramic is a (Ti, M)(C, N) solid solution, wherein M is selected from three or more of metal elements in a group IVB, a group VB and a group VIB, and the content molar ratio of any two metal elements in the (Ti, M)(C, N) solid solution is between 0.8 and 1.2. In the preparation process of the Ti (C, N)-based metal ceramic, nano carbide-binding phase composite powder is prepared through a low-temperature carbothermic reduction method, traditional multi-element addition carbide is replaced, and meanwhile the carbide issufficiently dissolved and precipitated through higher sintering temperature so as to obtain the high-entropy carbide ring phase structure. The obtained metal ceramic has higher hardness and high-temperature oxidation resistance than conventional metal ceramic, can improve the surface machining precision and service life of a cutter, and is widely applied to the fields of bearing materials, cutting tools, die materials and the like.

Description

technical field [0001] The invention belongs to the technical field of ceramic material preparation, and in particular relates to a Ti(C,N)-based cermet material with a high-entropy ring phase structure and a preparation method thereof. Background technique [0002] Ti(C,N)-based cermet is a hard composite material with Ti(C,N) as the main ceramic phase and iron group metals such as iron, cobalt and nickel as the metal binder phase. In order to improve the sintering activity of Ti(C,N)-based cermets and the bonding strength of the ceramic-metal interface, some (10-30)wt% secondary carbides are often added to the raw materials, mainly tungsten carbide and molybdenum carbide, At the same time, a small amount (3-5) wt% of tantalum carbide or niobium carbide is used to obtain good mechanical strength and high temperature creep resistance. [0003] At present, Ti(C,N)-based cermets have poorer strength and thermal shock resistance than cemented carbide, but their friction coeffi...

Claims

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Application Information

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IPC IPC(8): C22C30/00C22C1/05C22C1/10B22F3/02B22F3/10B22F9/04C23C8/24
CPCB22F3/02B22F3/1007B22F3/1017B22F3/1021B22F3/1035B22F9/04B22F2009/043C22C1/051C22C29/005C22C29/04C22C30/00C23C8/24
Inventor 熊慧文周科朝李志友
Owner CENT SOUTH UNIV
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