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A kind of preparation method of high-strength and high-toughness Ti(c,n)-based cermet

A high-strength, high-toughness, metal-based technology, applied in the field of cermets, can solve the problems of easy initiation of cracks, instability of cermets, and differences in physical properties of thermal expansion coefficients, etc., and achieve the effects of long red hardness, complete crystal lattice, and high toughness

Active Publication Date: 2021-02-19
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are differences in the distribution of elements such as Ti, W, Mo or Ta between the inner and outer ring phases and the core phase, resulting in differences in physical properties such as thermal expansion coefficient and elastic modulus, and cracks are easy to initiate, resulting in Ti(C ,N)-based cermets destabilized prematurely

Method used

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  • A kind of preparation method of high-strength and high-toughness Ti(c,n)-based cermet
  • A kind of preparation method of high-strength and high-toughness Ti(c,n)-based cermet
  • A kind of preparation method of high-strength and high-toughness Ti(c,n)-based cermet

Examples

Experimental program
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Effect test

Embodiment 1

[0037] 50.8Ti(C,N)-18WC-7Mo 2 C-5VC-10Ni-8Co-1.2C cermet

[0038] In the present embodiment 1, the mass parts of cermet component raw materials are as follows: 50.8 parts of Ti(C, N) solid solution powder, 18 parts of WC powder, 7 parts of Mo 2C powder, 5 parts of VC powder, 10 parts of Ni powder, 8 parts of cobalt powder and 1.2 parts of carbon powder, the total amount is 100 parts.

[0039] The specific preparation method is as follows: put the weighed raw material powders in the ball milling tank, add absolute ethanol until the surface of the balls and powder is submerged; carry out roller milling on the ball milling tank, the ball-to-material ratio is 12:1, and the rotation speed is 120r / min, the ball milling time is 60h; after ball milling, add 2% molten paraffin to the mixture, and carry out vacuum stirring for 2h; vacuum dry the powder, the drying temperature is 100°C, and the drying time is 8h; then pass the powder through a 100-mesh sieve net, cold pressing, pressi...

Embodiment 2

[0043] 65Ti(C,N)-18WC-5Mo2C-2VC-5Ni-4Co-1C cermet

[0044] In the present embodiment 2, the mass parts of cermet component raw materials are as follows: 65 parts of Ti (C, N) solid solution powder, 18 parts of WC powder, 5 parts of Mo 2 C powder, 2 parts of VC powder, 5 parts of cobalt and 4 parts of nickel, 1 part of carbon totals 100 parts.

[0045] The specific preparation steps are as follows: put the weighed powder in the ball mill tank, add absolute ethanol until the surface of the ball and powder is submerged; carry out roller milling on the ball mill tank, the ball-to-material ratio is 10:1, and the speed is 100r / min. The ball milling time is 72 hours; after ball milling, add 3% molten paraffin to the mixture, and carry out vacuum stirring for 2 hours; vacuum dry the powder at a drying temperature of 100°C and a drying time of 8 hours; then pass the powder through a 100-mesh sieve, Carry out cold pressing, the pressing pressure is 200MPa, and the pressure is maintaine...

Embodiment 3

[0048] 54.5Ti(C,N)-13WC-9Mo 2 C-7(Ti,V)C-15Ni-1.5C cermet

[0049] In the present embodiment 1, the mass parts of cermet component raw materials are as follows: 54.5 parts of Ti(C, N) solid solution powder, 13 parts of WC powder, 9 parts of Mo 2 C powder, 7 parts of (Ti, V) C powder, 15 parts of Ni powder and 1.5 parts of carbon powder, the total amount is 100 parts.

[0050] The specific preparation method is as follows: put the weighed raw material powders in the ball milling tank, add absolute ethanol until the surface of the balls and powder is submerged; carry out roller milling on the ball milling tank, the ball-to-material ratio is 8:1, and the speed is 120r / min, the ball milling time is 80h; after ball milling, add 2% molten paraffin to the mixture, and carry out vacuum stirring for 3h; vacuum dry the powder, the drying temperature is 100°C, and the drying time is 12h; then pass the powder through a 100-mesh sieve net, cold pressing, pressing pressure 200MPa, holdin...

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Abstract

The invention discloses a method for preparing a high-strength and high-toughness Ti(C,N)-based cermet. Firstly, by adding vanadium carbide and excess carbon to the raw material, the lattice parameter of the ring phase can be reduced and the bonding in the cermet can be reduced. In addition, nitrogen partial pressure needs to be introduced in the solid phase sintering stage to reduce the nitrogen loss of Ti(C,N)-based cermet. ) for an additional 1 to 3 hours of heat preservation, so that the lattice of the outer ring phase is complete and the lattice parameters change little. Therefore, the crystal lattice mismatch degree at the interface between the outer ring phase and the metal of the Ti(C,N)-based cermet prepared by the present invention is low, and the interface bonding strength between the ceramic and the bonding phase is high. The reduction of the lattice mismatch degree in the outer ring phase promotes the transformation of the ceramic fracture mode from intergranular fracture to transgranular fracture, and in-situ dimples near the fracture of the ceramic can effectively improve the strength and toughness of the cermet. The cermet can be widely used in the fields of bearing materials, cutting tools, mold materials and the like.

Description

technical field [0001] The invention relates to a preparation method of high-strength and high-toughness Ti(C,N)-based cermets, belonging to the technical field of cermets. Background technique [0002] Ti(C,N)-based cermets are important materials for wear-resistant workpieces, cutting tools, bearings and gauges working in harsh environments. However, the bonding phase Ni and Co do not infiltrate the ceramic phase Ti(C,N) enough, so that the strength and toughness of the cermet is low. In order to improve the wettability of Ni to Ti(C,N) particles, alloy elements such as W / Mo / Ta / Nb / Cr are usually introduced into cermets in the form of carbides and composite carbides / carbonitrides to obtain different Composition and morphology of the ring core phase. However, there are differences in the distribution of elements such as Ti, W, Mo or Ta between the inner and outer ring phases and the core phase, resulting in differences in physical properties such as thermal expansion coeff...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C29/04C22C1/05B22F3/10
CPCC22C29/04C22C1/051B22F3/101B22F2998/10B22F2999/00B22F1/10B22F3/1021B22F3/02B22F2009/043
Inventor 周科朝熊慧文李志友张斗甘雪萍
Owner CENT SOUTH UNIV
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