Ternary boride reinforced Ti-based (C,N) metal ceramic material and preparation method thereof

A technology of ternary boride and ceramic materials, which is applied in the field of metal matrix composite materials, can solve the problems of material performance deterioration, increased wear, uneven distribution of bonding phase, etc., and achieve the effect of enhancing wear resistance and improving hardness

Active Publication Date: 2019-04-05
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

So far, the most commonly used toughening methods for cermets include increasing the content of binder phase and adding nanophases. Although increasing the content of binder phase can have a significant toughening effect, the high metal phase also greatly damages the toughness of the material. In addition, the addition of nano-phases can toughen the metal matrix through dispersion strengthening, but the agglomeration of nano-phases and the reaction of nano-phases during liquid phase sintering make the selection of nano-added phases more difficult
[0003] Ternary borides have excellent mechanical properties and wear and corrosion resistance, but few reports have been used as the strengthening and toughening phase of Ti(C,N)-based cermets, because B is easy to dissolve in the liquid phase during sintering. Segregation at the interface between the hard phase and the binder phase, or the formation of a brittle third phase, or solid solution in the metal binder phase, resulting in deterioration of the performance of the material
However, this preferentially grown strip-shaped ternary boride will cause stress concentration, and it is very easy to break due to the yield limit in the application process, resulting in

Method used

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  • Ternary boride reinforced Ti-based (C,N) metal ceramic material and preparation method thereof
  • Ternary boride reinforced Ti-based (C,N) metal ceramic material and preparation method thereof
  • Ternary boride reinforced Ti-based (C,N) metal ceramic material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0074] Weigh Ti(C,N) 49g, WC 16g, MoC 4g, TaC 8g, WB 2 3g, Co 11g, Ni 9g, carbon powder 1g, molding agent (paraffin) 4g; the particle sizes of each powder are Ti(C,N) 2.28μm, WC 3.66μm, MoC 2μm, TaC 3.4μm, WB 2 0.5μm, Co 7.5μm, Ni 8.9μm, carbon powder 11.4μm. Carbide balls are grinding balls, the ball-to-material ratio is 5:1, absolute ethanol is 70mL, and the weighed 3gWB 2 Mix the powder with 20mL of absolute ethanol and place in a closed container, which will contain WB 2 Place the container of the mixed solution with absolute ethanol in the ultrasonic cleaner, place the temperature measuring instrument in the water outside the container, turn on the ultrasonic cleaner, and when the temperature reaches 40°C, take out the container, replace it with cold water, and then put it into the container to continue Ultrasound, and then repeat the operation of changing the cold water when the temperature reaches 40°C until the total ultrasonic time reaches 24h. The mixing time is...

Embodiment 2

[0077] Weigh respectively Ti(C,N) 51g, WC 16g, MoC 4g, TaC 8g, WB 2 1g, Co 11g, Ni 9g, carbon powder 1g, molding agent 4g; the particle sizes of each powder are Ti(C,N) 2.28μm, WC 3.66μm, MoC 2μm, TaC 3.4μm, WB 2 0.5μm, Co 7.5μm, Ni 8.9μm, carbon powder 11.4μm. Mix the weighed 1g of WB2 powder with 20mL of absolute ethanol, put it in a closed container, place the container containing the mixed solution of WB2 and absolute ethanol in an ultrasonic cleaner, and place the temperature measuring instrument in the water outside the container , Turn on the ultrasonic cleaning machine, when the temperature reaches 40°C, take out the container, replace with cold water, put it into the container to continue ultrasonication, and then repeat the operation of replacing cold water when the temperature reaches 40°C until the total ultrasonic time reaches 24h. The cemented carbide ball is a grinding ball, the ball-to-material ratio is 5:1, add 50mL of absolute ethanol, and then add the disp...

Embodiment 3

[0080] Weigh 51g of Ti(C,N), 16g of WC, 4g of MoC, 8g of TaC, 1g of MoB, 11g of Co, 9g of Ni, 1g of carbon powder, and 4g of forming agent; the particle diameters of each powder are respectively Ti(C,N ) 2.28 μm, WC 3.66 μm, MoC 2 μm, TaC 3.4 μm, MoB 3 μm, Co 7.5 μm, Ni 8.9 μm, carbon powder 11.4 μm.

[0081] Mix the weighed 1g of MoB powder with 20mL of absolute ethanol, put it in a closed container, place the container containing the mixed solution of MoB and absolute ethanol in an ultrasonic cleaner, and place the temperature measuring instrument in the water outside the container , Turn on the ultrasonic cleaning machine, when the temperature reaches 40°C, take out the container, replace with cold water, put it into the container to continue ultrasonication, and then repeat the operation of replacing cold water when the temperature reaches 40°C until the total ultrasonic time reaches 24h. The cemented carbide ball is a grinding ball, the ball-to-material ratio is 5:1, add ...

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Abstract

The invention discloses a ternary boride reinforced Ti-based (C,N) metal ceramic material and a preparation method thereof. The main preparation process comprises the following steps that Ti (C,N) metal ceramic raw material powder, carbide and nitride boride powder, binding phase raw material powder and binary boride powder are taken as raw materials, Ti-based (C,N) metal ceramic is prepared through the steps of ball milling mixing, drying, forming and sintering, wherein second phase ceramic particles generated by primary reaction are distributed in a binding phase of the metal ceramic material in a fine dispersion mode, the hardness and toughness of the metal ceramic material can be effectively improved through the phase. Compared with an existing technology for enhancing wear resistance,such as coating and surface treatment, the Ti-based (C,N) metal ceramic material prepared through the method has the advantages that the rockwell hardness reaches 91.5-94 HRA, the bending strength can reach 1800-2800 MPa, and the fracture toughness can reach 12-15 MPa.<-1/2>; and in addition, the depth of the grinding crack measured is reduced by about 70% compared with that of metal ceramic withthe same binding phase, and the friction coefficient is reduced by about 0.1.

Description

technical field [0001] The invention specifically relates to an in-situ generated ternary boride reinforced Ti(C,N)-based cermet material and a preparation method thereof, belonging to the field of metal matrix composite materials. Background technique [0002] Since Ti(C,N)-based cermet materials were first discovered in the 1970s, they have attracted widespread attention due to their high hardness, excellent wear resistance and red hardness. Ti(C,N)-based cermet material is a dense composite material prepared by liquid phase sintering technology with TiC, TiN or Ti(C,N) as the ceramic phase, metal Co and Ni as the binder phase. At present, the development of Ti(C,N)-based cermet materials is changing with each passing day, which is mainly reflected in the application of high-speed finishing and semi-finishing tools. Compared with WC-Co cemented carbide tool materials, Ti(C,N)-based The optimal cutting speed of cermets can usually be increased by 3 to 10 times, and can mai...

Claims

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Application Information

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IPC IPC(8): C22C29/04C22C1/05C22C1/10
CPCC22C1/051C22C29/005C22C29/04
Inventor 贺跃辉张鹛媚康希越
Owner CENT SOUTH UNIV
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