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A kind of ultrafine grain high performance ti(c,n)-tib2-wc composite metal ceramic cutter and preparation method thereof

A technology of composite metal and ceramic cutting tools, which is applied in the direction of mechanical equipment, other manufacturing equipment/tools, engine components, etc., can solve the problems of reducing the bonding force of grain boundaries, coarsening of grains, and low solubility of ceramic phases, etc., and achieve compact structure The effect of uniform distribution, ultra-fine grain, and superior cutting performance

Active Publication Date: 2018-10-16
TAIZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to avoid the non-dense Ti(C,N) during low-temperature sintering in the traditional powder metallurgy method and the grain coarsening phenomenon during high-temperature sintering, and overcome the impurity at the grain boundary of the sintered body that reduces the grain boundary. Problems with binding force and low solubility of the ceramic phase in the binder phase

Method used

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  • A kind of ultrafine grain high performance ti(c,n)-tib2-wc composite metal ceramic cutter and preparation method thereof
  • A kind of ultrafine grain high performance ti(c,n)-tib2-wc composite metal ceramic cutter and preparation method thereof
  • A kind of ultrafine grain high performance ti(c,n)-tib2-wc composite metal ceramic cutter and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0026]The raw material powder according to the component ratio in the attached table was put into a drum ball mill for dry mixing for 24 hours, the ball mill speed was 400r / min, the grinding medium was zirconia balls with a diameter of 8mm, and the ball-to-material ratio was 8:1. After the powder is evenly mixed, take it out and pass through a 100-mesh sieve, then weigh a certain amount of powder and put it into a cylindrical graphite mold with a diameter of 20mm for pre-pressing for 10min at a pressure of 20MPa. Then put the graphite mold with the powder compact into the vacuum hot pressing sintering furnace and heat it to the set temperature (from room temperature to 800°C, the heating rate is 10°C / min; above 800°C, the heating rate is 5°C / min), Keep warm for 60 minutes and then cool down with the furnace. The sintering temperature ranges from 1400°C to 1800°C. In order to obtain high-density materials, a unidirectional pressure of 20MPa is applied between 900°C and the set ...

Embodiment 2

[0028] The tool material composition is: Co: 8wt.% (purity 99wt.%, particle size<1μm), Ti: 53wt.% (purity 99.9wt.%, particle size<0.8μm), C: 1wt.% (purity 98wt.%, particle size <1 μm), BN: 10 wt.% (purity 99 wt.%, particle size <0.5 μm), WC: 25 wt.% (purity 99.9 wt.%, particle size <0.4 μm).

[0029] The specific preparation process is as follows: put the raw material powder into a roller ball mill and dry mix for 24 hours, the speed of the ball mill is 400r / min, the grinding medium is zirconia balls with a diameter of 8mm, and the ball-to-material ratio is 8:1. After the powder is evenly mixed, take it out and pass through a 100-mesh sieve, then weigh a certain amount of powder and put it into a cylindrical graphite mold with a diameter of 20mm for pre-pressing for 10min at a pressure of 20MPa. Then put the graphite mold with the powder compact into the vacuum hot pressing sintering furnace and heat it to the set temperature (from room temperature to 800°C, the heating rate i...

Embodiment 3

[0032] The tool material composition is: Co: 8wt.% (purity 99wt.%, particle size<1μm), Ti: 57wt.% (purity 99.9wt.%, particle size<0.8μm), C: 2wt.% (purity 98wt.%, particle size <1 μm), BN: 11 wt.% (purity 99 wt.%, particle size <0.5 μm), WC: 20 wt.% (purity 99.9 wt.%, particle size <0.4 μm).

[0033] The specific preparation process is as follows: put the raw material powder into a roller ball mill and dry mix for 24 hours, the speed of the ball mill is 400r / min, the grinding medium is zirconia balls with a diameter of 8mm, and the ball-to-material ratio is 8:1. After the powder is evenly mixed, take it out and pass through a 100-mesh sieve, then weigh a certain amount of powder and put it into a cylindrical graphite mold with a diameter of 20mm for pre-pressing for 10min at a pressure of 20MPa. Then put the graphite mold with the powder compact into the vacuum hot pressing sintering furnace and heat it to the set temperature (from room temperature to 800°C, the heating rate i...

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Abstract

The invention belongs to the technical field of new materials, and discloses a high-performance ultra-fine grain Ti(C,N)-TiB2-WC composite metal ceramic tool and a preparation method thereof. The high-performance ultra-fine grain Ti(C,N)-TiB2-WC composite metal ceramic tool is synthesized in-situ through a one-step method, and the grain size of the tool is smaller than 700 nm. The high-performance ultra-fine grain Ti(C,N)-TiB2-WC composite metal ceramic tool mainly comprises 8wt.% of Co (with the purity of 99wt.% and the granularity smaller than 1 [mu]m), 53-69wt.% of Ti (with the purity of 99.9wt.% and the granularity smaller than 0.8 [mu]m), 1-4wt.% of C (with the purity of 98wt.% and the granularity smaller than 1 [mu]m), 10-14wt.% of BN (with the purity of 99 wt.% and the granularity smaller than 0.5 [mu]m) and 5-25wt.% of WC (with the purity of 99.9wt.% and the granularity smaller than 0.4 [mu]m). The preparation method of the tool comprises the steps that powder is prepared through grinding, pre-pressing is conducted under the pressure of 8 MPa, a blank is formed through vacuum reacting, hot-pressing and sintering, a blade is ground, and finally, the Ti(C,N)-TiB2-WC composite metal ceramic tool is obtained. Compared with a traditional metal ceramic tool, the metal ceramic tool prepared through the method and added with carbide has higher hardness and abrasion resistance and has obvious advantages on the aspects of thermal stability, abrasion resistance, thermal conductivity, oxidation resistance, high-temperature hardness, high-temperature strength and cutting performance.

Description

technical field [0001] The invention belongs to the technical field of new materials, in particular to an ultrafine-grained high-performance [0002] Ti(C,N)-TiB 2 -WC composite cermet cutting tool material and preparation method Background technique [0003] As a high-speed cutting tool, titanium carbonitride-based cermets are rich in raw materials, low in manufacturing cost, and have excellent red hardness, thermochemical properties, and wear resistance. The field of finishing shows good development prospects. However, the strength and toughness of titanium carbonitride-based cermets are insufficient, and they are prone to peeling or even micro chipping during service. Fine-grain strengthening is an effective method that can simultaneously improve the strength, hardness, plasticity and toughness of materials. In addition, by adding appropriate carbides, the wettability between the ceramic phase and the binder phase can be improved, and the solubility of the ceramic pha...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C29/04B22F3/16B22F5/00
CPCB22F3/16B22F5/00B22F2005/001C22C29/04
Inventor 方一航张梦贤赵先锐徐爱娇冯尚申薛双喜霍颜秋李战江吴建波张平
Owner TAIZHOU UNIV
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