Nano WC-Co composite powder modified Ti(CN) based metal ceramic and preparation thereof

A technology of composite powder and base metal, which is applied in the field of cermets, can solve the problems of high cutting force, low tool life and high cutting temperature, and achieve improved fracture toughness, good wear resistance, and excellent impact resistance. Effect

Active Publication Date: 2008-09-03
ZHUZHOU CEMENTED CARBIDE CUTTING TOOLS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, under high-speed cutting conditions, especially when processing some difficult-to-machine materials, the existing Ti(CN)-based cermet alloys are difficult to deal with due to harsh working conditions such as high cutting temperature, large cutting force, and severe work hardening. , the durability and life of the tool are not high, so how to further improve the high-temperature strength and hardness of the cermet material, and improve its red hardness and wear resistance becomes very important

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Raw material powder is prepared according to the following mass proportion: 17% nano WC-10% Co composite powder, 45% Ti (CN) powder, 8% (Ta, Nb) C powder, 8% Mo 2 C powder, 7% TiC powder, 7% Co and 8% Ni, wherein the nanometer WC-Co composite powder has a particle size of 50-100 nanometers, and the average particle size of the remaining raw material powders is less than 1.5 microns.

[0019] Put the above-mentioned raw material powder into a ball mill, use absolute ethanol as the grinding medium, use cemented carbide as the grinding body, add Tween (as a dispersant) of 0.8% of the raw material powder total amount, 3% polyethylene glycol and 1% Polytetrahydrofuran (as binder), the ball-to-material ratio is 1:10, the ball milling speed is 36 rpm, the ball milling mixing time is 56 hours, and the slurry after ball milling dispersion is spray-dried (nozzle outlet temperature 90°C, continuous Drying, the drying time depends on the amount of slurry), precision pressing, and t...

Embodiment 2

[0023] Raw material powder is prepared according to the following mass proportion: 10% nano WC-10% Co composite powder, 46% Ti (CN) powder, 12% (Ta, Nb) C powder, 7% Mo 2 C powder, 10% TiC powder, 8% Co and 7% Ni, wherein the particle size of nano WC-Co composite powder is 50-100 nanometers, and the average particle size of other raw material powders is less than 1.5 microns.

[0024] Put the above-mentioned raw material powder into a ball mill, use absolute ethanol as the grinding medium, use cemented carbide as the grinding body, add Tween (as a dispersant) of 0.8% of the raw material powder total amount, 3% polyethylene glycol and 1% Polytetrahydrofuran (as binder), the ball-to-material ratio is 1:11, the ball milling speed is 36 rpm, the ball milling mixing time is 50 hours, and the slurry after ball milling dispersion is spray-dried (nozzle outlet temperature 90° C.), After precise pressing and forming, it is pre-fired for 3 hours (200-500°C), and finally heated in 1450°C...

Embodiment 3

[0028] Prepare raw material powder by following mass proportion: 27% nano WC-5%Co composite powder, 40% Ti (CN) powder, 7% (Ta, Nb) C powder, 4% Mo 2 C powder, 10% TiC powder, 6% Co and 6% Ni, wherein the particle size of nano WC-Co composite powder is 50-100 nanometers, and the average particle size of other raw material powders is less than 1.5 microns.

[0029] Put the above-mentioned raw material powder into a ball mill, use absolute ethanol as the grinding medium, use cemented carbide as the grinding body, add Tween (as a dispersant) of 0.8% of the raw material powder total amount, 3% polyethylene glycol and 1% Polytetrahydrofuran (as a binder); the ball-to-material ratio is 1:10, the ball milling speed is 36 rpm, the ball milling mixing time is 52 hours, and the ball milling slurry is vacuum-dried (88°C) for 2 hours and precision pressed , and then pre-fired for 3 hours (200-500°C), and finally vacuum sintered at 1460°C and kept for 70 minutes to prepare Ti(CN)-based cer...

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Abstract

The invention discloses a nanometer WC-Co composite powder modified Ti(CN) based cermet and the preparing method thereof. Titanium carbonitride is used as the main parent metal, metal cobalt and/or nickel are/is used as the binder of raw material powder, carbide and tantalum-niobium sosoloid are used as the additive. The cermet is characterized in: the cermet is added with 6.0% to 27% by weight of raw material power nanometer WC-Co composite powder; the cermet is prepared with the raw material powder by ball grinding crushing, dispersing the nanometer WC-Co composite powder, uniformly mixing, press forming, vacuum or pressure sintering, etc. Compared with traditional cermet, since the cementing phase and the crystal boundary are strengthened, the nanometer WC-Co composite powder modified Ti(CN) based cermet has better wearing resistance, higher strength, fracture toughness and red hardness, thus a tool bit manufactured with the cermet has superior cutting property.

Description

technical field [0001] The invention relates to a carbonitride-based cermet, in particular to a titanium carbonitride (Ti(CN))-based cermet modified by nanocomposite powder and a preparation method thereof. Background technique [0002] Due to the large particle size of the raw material powder, the cermet alloy of traditional particles is more prone to cracks after being processed into alloy tools. In addition to the uneven structure, the processed tools also show poor toughness. In recent years, the research on nanotechnology and nanomaterials has become a research hotspot, and the preparation of many nanopowders has entered the stage of industrialization. Due to the unique size effect and surface interface effect of ultrafine powder, nanomaterials have excellent physical, mechanical and mechanical properties. However, also due to the size effect and surface interface effect of nano-powders, the agglomeration of nano-powders is very serious, and the production and preparat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C29/02C22C30/00C22C1/05
Inventor 周书助唐宏珲张洁尧王社权潘伟胡茂中李屏
Owner ZHUZHOU CEMENTED CARBIDE CUTTING TOOLS CO LTD
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