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A ternary boride reinforced Ti(c,n)-based cermet material and its preparation method

A technology of ternary borides and ceramic materials, which is applied in the field of metal matrix composite materials, can solve the problems of excessive particle size, insufficient liquid phase filling, and deterioration of material properties, so as to achieve enhanced wear resistance and toughness, and uniform surface properties Consistent, friction-reducing effect

Active Publication Date: 2021-06-04
CENT SOUTH UNIV
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  • 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 component failure. Large, it is easy to fall off and become a hard point during the friction process, thereby increasing wear
In addition, during the high-temperature sintering process, due to the violent reaction to form ternary borides and the reaction temperature is lower than the liquidus temperature point, a large amount of surrounding Mo and Ni will be consumed during the growth of strip-shaped ternary borides. element, however, the Mo element is Mo 2 The main forming element of C and Mo 2 C can form a transition phase between the hard phase and the binder phase through a solid solution precipitation mechanism to improve the wettability of the two phases. Ni is one of the main elements of the binder phase and provides a certain toughness for the material; in boron After the compound was added, due to the preferential and rapid growth of the ternary boride produced by the reaction, the concentration of Mo and Ni elements around the ternary boride phase decreased sharply, which led to poor shell phase formation of the hard phase particles around the ternary boride. Sufficient, the liquid phase filling is not sufficient; it also leads to uneven distribution of the overall binder phase of the material

Method used

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  • A ternary boride reinforced Ti(c,n)-based cermet material and its preparation method
  • A ternary boride reinforced Ti(c,n)-based cermet material and its preparation method
  • A ternary boride reinforced Ti(c,n)-based cermet material and its preparation method

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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 size of each powder is 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 disper...

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(C,N)-based cermet material and a preparation method thereof. The main preparation process is: using Ti(C,N) cermet raw material powder, carbide and nitride boride powder, binder phase raw material powder; binary boride powder as raw materials, through ball milling, drying, molding and sintering steps Ti(C,N)-based cermets are prepared, in which the second-phase ceramic particles generated by in-situ reaction are finely dispersed in the binder phase of the cermet material, and the presence of this phase can effectively improve the hardness and toughness. Compared with the existing coating and surface treatment technologies to enhance wear resistance, the obtained Ti(C,N)-based cermet material has a Rockwell hardness of 91.5-94HRA and a bending strength of 1800-2800MPa , the fracture toughness can reach 12~15MPa·m ‑1 / 2 In addition, the measured wear scar depth of the Ti(C,N)-based cermet material prepared by this method is about 70% lower than that of the same binder phase cermet, and the friction coefficient is about 0.1 lower.

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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Patent Type & Authority Patents(China)
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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