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Ti (C, N) base metal ceramic with homogeneous ring core structure and preparation method thereof

A homogeneous ring and base metal technology, applied in the field of cermets, can solve problems such as inhomogeneous ring core interface structure, incomplete inner ring phase, reduction, etc., to achieve the promotion of diffusion reaction speed, fine grain size, and grain size uniform effect

Active Publication Date: 2019-11-01
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it can be seen from the figure that the ring core structure in the prior art has the problems of incomplete inner ring phase and inhomogeneous ring core interface structure, which will greatly reduce the mechanical properties of Ti(C,N)-based cermets

Method used

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  • Ti (C, N) base metal ceramic with homogeneous ring core structure and preparation method thereof
  • Ti (C, N) base metal ceramic with homogeneous ring core structure and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] 43Ti(C,N)-4TiC-15WC-9Mo 2 C-5TaC-24.5Ni-0.5C cermet

[0044] In the present embodiment 1, the mass parts of cermet component raw materials are as follows: 43 parts of Ti (C, N) powder, 4 parts of TiC powder, 15 parts of WC powder, 9 parts of Mo 2 C powder, 5 parts of TaC powder, 24.5 parts of Ni powder and 0.5 part of carbon powder, the total amount is 100 parts.

[0045] The preparation steps of the cermet are: the weighed TiC / WC / Mo 2 Put the C / TaC powder in the ball milling tank, add absolute ethanol until the surface of the ball and the powder is covered; carry out roller milling on the ball milling tank, the ball to material ratio is 10:1, the speed is 100r / min, the ball milling time is 20h, after drying Afterwards, vacuum storage; followed by secondary ball milling, with a ball-to-material ratio of 8:1, a rotational speed of 100r / min, and a ball milling time of 60h; after ball milling, 3% molten paraffin was added to the mixture and vacuum stirred for 2h; the pow...

Embodiment 2

[0049] 50Ti(C,N)-2TiC-15WC-9Mo 2 C-5TaC-18.8Ni-0.2C cermet

[0050] In the present embodiment 2, the mass parts of cermet component raw materials are as follows: 50 parts of Ti (C, N) powder, 2 parts of TiC powder, 15 parts of WC powder, 9 parts of Mo 2 C powder, 5 parts of TaC powder, 18.8 parts of Ni powder and 0.2 part of carbon powder, the total amount is 100 parts.

[0051] The preparation steps of the cermet are: the weighed TiC / WC / Mo 2 Put the C / TaC powder in the ball mill tank, add absolute ethanol until the surface of the ball and the powder is covered; carry out roller milling on the ball mill barrel, the ball-to-material ratio is 12:1, the speed is 120r / min, the ball milling time is 30h, and dried Afterwards, it was stored in vacuum; followed by secondary ball milling, the ball-to-material ratio was 12:1, the rotational speed was 100r / min, and the ball milling time was 60h; after ball milling, 2% molten paraffin was added to the mixture, and vacuum stirring was ca...

Embodiment 3

[0054] 55Ti(C,N)-5TiC-24WC-6TaC-5Ni-4.2Co-0.8C cermet

[0055] The mass parts of cermet component raw materials in the present embodiment 3 are as follows: 65 parts of Ti (C, N) powder, 5 parts of TiC powder, 18 parts of WC powder, 2 parts of TaC powder, 5 parts of Ni powder and 4.2 parts Part of cobalt, 0.8 part of carbon powder, the total amount is 100 parts.

[0056] The preparation steps of the cermet are as follows: put the weighed TiC / WC / TaC powder in a ball milling tank, add absolute ethanol until the surface of the ball and the powder is submerged; perform roller milling on the ball milling tank, the ball-to-material ratio is 15: 1. The rotation speed is 140r / min, the ball milling time is 20h, and it is dried and stored in vacuum; after that, the second ball milling is carried out, the ball-to-material ratio is 10:1, the speed is 100r / min, and the ball milling time is 50h; after ball milling, in the mixture Add 2% molten paraffin to the mixture, and carry out vacuum s...

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Abstract

The invention discloses a Ti (C, N) base metal ceramic with a homogeneous ring core structure and a preparation method thereof. The ring core structure of the metal ceramic has complete inner and outer ring phases, and ring core phases have narrow particle size distribution and uniform structure distribution. Raw material powder preparing the metal ceramic includes, by weight, 40-55 parts of Ti (C, N) powder, 0.5-5 parts of titanium carbide powder, 10-30 parts of transition group metal carbide powder, 8-25 parts of iron group metal binding phases and 0.05-1.5 parts of carbon powder. The preparation method of the metal ceramic is characterized by two-step ball milling and solid phase nitrogen partial pressure long time sintering. On the basis of keeping good wear resistance, the metal ceramic has higher bending strength and fracture toughness than a metal ceramic with a conventional ring core structure, and can be widely used in bearing materials, cutting tools, die materials and otherfields.

Description

technical field [0001] The invention relates to a Ti(C,N)-based cermet with a homogeneous ring core structure and a preparation method thereof, belonging to the technical field of cermets. Background technique [0002] Ti(C,N)-based cermets have high hardness and good chemical stability, so they can be used as wear-resistant workpieces, cutting tools and bearings and gauges working in harsh environments. However, the flexural strength and fracture toughness of most Ti(C,N)-based cermets are inferior to those of traditional cemented carbide materials, which limits their application fields. The physical and chemical properties of cermets are mainly due to the insufficient wetting of the ceramic phase Ti(C,N) by the conventional binder phases Ni and Co, so that after sintering, the metal-ceramic interface strength of the cermets is weak, and at a certain heat It is prone to failure under impact or instantaneous external stress. At present, the most effective method is to add ...

Claims

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Application Information

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IPC IPC(8): C22C29/04C22C1/05
CPCC22C1/051C22C29/005C22C29/04
Inventor 熊慧文周科朝李志友张斗甘雪萍
Owner CENT SOUTH UNIV
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