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Nano silicon nitride and boron nitride reinforced titanium carbonitride based cermet

A technology of nano-silicon nitride and nano-boron nitride, which is applied in the field of titanium carbonitride)-based cermet materials and its preparation, can solve the problems of unfavorable mixing uniformity, unknown parameters such as strength and hardness of cermet materials, bending strength and The problem of limited wear resistance, etc., to achieve the effect of improving hardness

Inactive Publication Date: 2011-05-18
XIAMEN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

CN101255512A proposes a boron-containing titanium carbonitride-based cermet tool material, wherein boron is prepared by adding one or more of elemental boron, titanium diboride, boron nitride, and boron oxide in the form of raw materials, although It involves improving the cutting speed and service life, but the parameters such as the strength and hardness of the cermet material are unknown
Because the whisker diameter is on the order of microns and its length range is wide (10-40 μm), it is not conducive to uniform mixing, and has limited effect on improving the bending strength and wear resistance

Method used

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  • Nano silicon nitride and boron nitride reinforced titanium carbonitride based cermet
  • Nano silicon nitride and boron nitride reinforced titanium carbonitride based cermet

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] Preparation process see figure 1 and figure 2 .

[0064] (1) Containing Ti(C x , N 1-x ) or (TiC) x +(TiN) 1-x The components and weight percentages in the batch

[0065] The content is:

[0066] WC 15wt% TaC 10wt% Mo 2 C 8wt% Co 10wt%

[0067] Ni 5wt% ZrC 1.0wt% VC 0.5wt% (nm) Si 3 N 4 8wt%

[0068] The balance is Ti(C 0.5 N 0.5 ). The particle size of the remaining powders is ≤2 μm.

[0069] (2) Mixing: Fully mix the raw material powders in a mixer for 24 hours.

[0070] (3) Wet milling: put the above mixed powder into a stainless steel ball milling tank, add hexane at 350ml / l, select Φ5 hard alloy balls, the ball-to-material ratio is 5:1, the rotating speed is 200rpm, and ball mill for 72 hours.

[0071] (4) Add molding agent: weigh paraffin wax at 5wt%, dissolve it in hexane, add it into a ball mill jar, and continue ball milling for 2 hours.

[0072] (5) Screening: pass the milled slurry through a 60-mesh sieve, and settle for 2 hours.

[0073]...

Embodiment 2

[0078] Preparation process see figure 1 and figure 2 .

[0079] (1) Containing Ti(C x , N 1-x ) or (TiC) x +(TiN) 1-x The components and weight percentages in the batch are:

[0080] WC 17wt% TaC 7wt% Mo 8wt% C 0.6wt%

[0081] Co 8wt% Ni 7wt% ZrC 0.5wt% Cr 3 C 2 0.5wt%

[0082] VC 0.5wt% (nm) BN 3.0wt% balance (TiC) 0.6 +(TiN) 0.4 . The particle size of the remaining powders is ≤2 μm.

[0083] (2) mixing: with embodiment 1.

[0084] (3) wet milling: with embodiment 1.

[0085] (4) Add forming agent: with embodiment 1.

[0086] (5) sieving: with embodiment 1.

[0087] (6) dry granulation: with embodiment 1.

[0088] (7) compression molding: same as embodiment 1.

[0089] (8) Sintering: press attached figure 2 Process sintering, the nitrogen pressure is 2000Pa.

[0090] The hardness of the obtained cermet material is HRA93.4, the bending strength is 1810MPa, and the fracture toughness is 14.2MPa m 1 / 2 .

Embodiment 3

[0092] Preparation process see figure 1 and Figure 3.

[0093] (1) Containing Ti(C x , N 1-x ) or (TiC) x +(TiN) 1-x The components and weight percentages in the batch are:

[0094] WC 16wt% TaC 9wt% Mo 2 C 12wt% Co

[0095] 10wt%

[0096] Ni 5wt% ZrC 1.0wt% VC 0.5wt%

[0097] (nm) (Si 3 N 4 ) 0.3 +(BN) 0.7 2.0wt%

[0098] The balance is Ti(C 0.7 N 0.3 ). The particle size of the remaining powders is ≤2 μm.

[0099] (2) mixing: with embodiment 1.

[0100](3) Wet milling: put the above mixed powder into a stainless steel ball milling tank, add ethanol at 400ml / l, select Φ5 cemented carbide balls, the ball-to-material ratio is 10:1, the rotating speed is 200rpm, and ball mill for 48 hours.

[0101] (4) Add molding agent: weigh 1.5wt% rubber, dissolve it in gasoline, add it into a ball mill jar, and continue ball milling for 2 hours.

[0102] (5) sieving: with embodiment 1.

[0103] (6) dry granulation: with embodiment 1

[0104] (7) compression molding: sa...

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Abstract

The invention discloses a nano silicon nitride and boron nitride reinforced titanium carbonitride based cermet. A reinforced phase is added into a base material having a main phase of titanium carbonitride Ti(C, N) and a binder phase of nickel and cobalt metals, is at least one of nano silicon nitride and nano boron nitride, and is 0.5 to 2.5 volume percent of the base material. The preparation method comprises the following process flows: preparing raw material powder containing the nano silicon nitride and / or nano boron nitride; mixing; adding a forming agent; performing wet grinding; sieving; drying and granulating; performing compression molding; sintering in nitrogen; and obtaining the cermet. The cermet has the advantages of high hardness, high strength and high toughness, and can be widely applied to middle and low carbon steel and low alloy steel high-speed cutting tool materials; and the preparation process is easy to control and is suitable for large-scale industrial production.

Description

technical field [0001] The invention relates to a cermet material and a preparation technology, in particular to a titanium carbonitride (Ti(C, N))-based cermet material reinforced by nanometer silicon nitride and boron nitride and its preparation. Background technique [0002] Titanium carbonitride (Ti(C,N))-based cermets are developed on the basis of titanium carbide (TiC)-based cermets, with Ti(C,N) as the main hard phase and nickel and molybdenum as the binder. corresponding tool material. Its high hardness, high red hardness, high oxidation resistance and corrosion resistance, and high resistance to adhesive wear and diffusion wear during cutting are especially suitable for semi-finishing and finishing of steel and cast iron. At present, the amount of foreign cutting tool materials has accounted for 10% to 30% of the total amount of indexable cutting tool materials. In China, cutting tools are still mostly made of WC-based cemented carbide or ceramics. Traditional WC...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C29/04C22C1/05
Inventor 张厚安古思勇葛晓宏许龙山章文献谢能平易继勇
Owner XIAMEN UNIV OF TECH
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