Ti (C, N)-based metal ceramic with positive gradient ring core phase and preparation method thereof

A technology of base metal and ring core, applied in the field of Ti-based cermet and its preparation

Active Publication Date: 2021-09-14
CENT SOUTH UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The ring phase can optimize the structure distribution of the material, refine the grains, and improve the bonding strength between the ceramic phase and the metal; however, the ring phase is a brittle phase, and dislocations accumulate at the inner interface of the ring core structure, and there is a certain interfacial internal stress, which is easy to induce Crack initiation

Method used

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  • Ti (C, N)-based metal ceramic with positive gradient ring core phase and preparation method thereof
  • Ti (C, N)-based metal ceramic with positive gradient ring core phase and preparation method thereof

Examples

Experimental program
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Embodiment 1

[0053] Composition: 45Ti(C,N)-25WC-11.1Mo 2 C-3TaC-15(60Ni35Co-5Ti)-0.9C cermet

[0054] The mass fraction of the cermet composition is 45 parts of Ti(C, N), 25 parts of WC, 11.1 parts of Mo 2 C, 3.0 parts of TaC and 15.0 parts of binder phase. The average particle sizes of Ti(C,N), WC and Mo2C are 1.5 μm, 15 μm and 8 μm, respectively; the composition of the binder phase is 60 parts of nickel, 35 parts of cobalt and 5 parts of titanium.

[0055] The preparation steps of the cermet are as follows: (1) Put the weighed Ti(C,N) powder, TaC powder, metal binder phase powder and carbon black in a ball mill jar, add absolute ethanol until the ball and the surface of the powder; the ball mill barrel is subjected to roller milling, the ball-to-material ratio is 12:1, the rotating speed is 80r / min, and the ball milling time is 40h; (2) After the first ball milling, add the corresponding WC and Mo to the mixture 2 C powder, and 2% molten paraffin, and then ball milled for 4 hours, the...

Embodiment 2

[0058] Composition: 50Ti(C,N)-20WC-8Mo 2 C-1.7NbC-18(50Ni42Co-7Ni3Ti)-2.3C cermet, the mass fraction of the cermet components is 50 parts of Ti(C,N), 20 parts of WC, 8 parts of Mo 2 C, 1.7 parts of NbC, 18 parts of titanium-containing binder phase, 2.3 parts of C. Among them Ti(C,N), WC and Mo 2 The average particle sizes of C are 2.1 μm, 18 μm and 12 μm, respectively.

[0059] The preparation steps of the cermet are: (1) put the weighed Ti(C,N) powder, NbC powder, metal binder phase powder and carbon black in a ball mill jar, add absolute ethanol until the ball and the surface of the powder; the ball mill barrel is subjected to roller milling, the ball-to-material ratio is 10:1, the rotating speed is 100r / min, and the ball milling time is 40h; (2) After the first ball milling, add the corresponding WC and Mo to the mixture 2 C powder, and 3% molten paraffin, and then carry out ball milling 15h, and ball milling rate is 50r / min; (3) carry out vacuum drying to powder subsequ...

Embodiment 3

[0062] Composition: 52Ti(C,N)-15WC-6Mo 2 C-1.5TaC-22(50Ni40Co-10Ti)-3.5C cermet

[0063] The mass fraction of the cermet composition is 52 parts of Ti(C, N), 15 parts of WC, 6 parts of Mo 2 C, 1.5 parts of NbC, 22 parts of titanium-containing binder phase, 3.5 parts of C. Among them Ti(C,N), WC and Mo 2 The average particle sizes of C are 2.1 μm, 18 μm and 12 μm, respectively.

[0064] The preparation steps of the cermet are: (1) put the weighed Ti(C,N) powder, NbC powder, metal binder phase powder and carbon black in a ball mill jar, add absolute ethanol until the ball and the surface of the powder; the ball mill barrel is subjected to roller milling, the ball-to-material ratio is 10:1, the rotating speed is 100r / min, and the ball milling time is 30h; (2) After the first ball milling, add the corresponding WC and Mo to the mixture 2 C powder, and 3% molten paraffin, and then carry out ball milling 20h, and ball milling speed is 40r / min; (3) carry out vacuum drying to powd...

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Abstract

The invention discloses a Ti (C, N)-based metal ceramic with a positive gradient ring core phase and a preparation method thereof. The outer ring phase of a metal ceramic ring core structure is rich in W / Mo and poor in N compared with the inner ring phase, a solid solution metal element W / Mo in a ring core phase is distributed in a positive gradient mode from the core part to the outer ring, and the metal ceramic ring core structure is of a positive gradient structure opposite to a conventional ring core phase in composition. Compared with a conventional ring core phase Ti (C, N)-based metal ceramic, a positive gradient ring core phase structure can improve the interface wetting and bonding strength of a ceramic phase and a binding phase, reduce the lattice mismatch degree of the interface in a ring core, and effectively improve the strength and thermal shock resistance of the Ti (C, N)-based metal ceramic. On the basis of keeping good obdurability, the metal ceramic has higher obdurability and thermal shock resistance compared with conventional metal ceramic, can improve the surface machining precision of a tool and prolong the service life of the tool, and is widely applied to the fields of bearing materials, cutting tools, mold 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 with a positive gradient ring core phase and a preparation method thereof. Background technique [0002] Titanium carbonitride (Ti(C,N))-based cermet materials have excellent wear resistance and high-temperature cutting performance, and are high value-added hard materials that need to be developed urgently in response to the lack of tungsten resources in my country. Insufficient toughness is the main technical problem faced by the application of Ti(C,N)-based cermets, which is attributed to the fact that the bonding of metal Ni and its alloys does not wet the Ti(C,N) hard phase interface. Forming a ring phase on the surface of Ti(C,N) particles, improving the wettability of the bonding phase to the ceramic phase and optimizing the microstructure of the ring-core interface are the main methods to improve the strength and toug...

Claims

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Application Information

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IPC IPC(8): C22C29/04C22C1/05B22F3/02B22F3/10B22F5/10B22F9/04
CPCC22C29/04C22C29/005C22C1/051B22F5/106B22F9/04B22F3/02B22F3/1021B22F3/1007B22F2009/043B22F2999/00B22F2201/02B22F2201/11
Inventor 熊慧文刘全明褚胜林董伟
Owner CENT SOUTH UNIV
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