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Ultra-fine grain high-performance Ti(C,N)-TiB2-WC-TaC composite metal ceramic cutting tool and preparing method

A technology of composite metal and ceramic cutting tools, applied in the field of new materials, can solve the problems of grain coarsening, low solubility of ceramic phase, and reduce grain boundary bonding force, etc., to achieve ultra-fine grain, superior cutting performance, and dense distribution of structure uniform effect

Active Publication Date: 2017-10-24
TAIZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] 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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  • Ultra-fine grain high-performance Ti(C,N)-TiB2-WC-TaC composite metal ceramic cutting tool and preparing method
  • Ultra-fine grain high-performance Ti(C,N)-TiB2-WC-TaC composite metal ceramic cutting tool and preparing method
  • Ultra-fine grain high-performance Ti(C,N)-TiB2-WC-TaC composite metal ceramic cutting tool and preparing method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The raw material powders according to the component ratios in Attached Table 1 were put into a drum-type ball mill and dry-mixed for 24 hours, the speed of the ball mill 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...

Embodiment 2

[0025] The tool material composition is: Co: 8wt.% (purity 99wt.%, particle size<1μm), Ti: 62wt.% (purity 99.9wt.%, particle size<0.8μm), C: 3wt.% (purity 98wt.%, particle size <1μm), BN: 12wt.% (purity 99wt.%, particle size <0.5μm), WC: 3wt.% (purity 99.9wt.%, particle size <0.4μm), TaC: 12wt.% (purity 99.9wt. %, particle size <0.4μm).

[0026] 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 (fro...

Embodiment 3

[0029] The tool material composition is: Co: 8wt.% (purity 99wt.%, particle size<1μm), Ti: 62wt.% (purity 99.9wt.%, particle size<0.8μm), C: 3wt.% (purity 98wt.%, particle size <1μm), BN: 12wt.% (purity 99wt.%, particle size <0.5μm), WC: 6wt.% (purity 99.9wt.%, particle size <0.4μm), TaC: 9wt.% (purity 99.9wt. %, particle size <0.4μm).

[0030] 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...

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Abstract

The invention belongs to the technical field of new materials, and discloses an ultra-fine grain high-performance Ti(C,N)-TiB2-WC-TaC composite metal ceramic cutting tool and a preparing method. An ultra-fine grain high-performance Ti(C,N)-TiB2-WC-TaC composite metal ceramic material is subject to one-step method in-situ synthesis, and the grain size is smaller than 500 nm. The ultra-fine grain high-performance Ti(C,N)-TiB2-WC-TaC composite metal ceramic material is mainly composed of the following materials including, by weight, 8% of Co, 62% of Ti, 3% of C, 12% of BN, 3%-12% of WC and 3%-12% of TaC, wherein the purity of the Co is 99%, the granularity of the Co is smaller than 1 micron, the purity of the Ti is 99.9%, the granularity of the Ti is smaller than 0.8 micron, the purity of the C is 98%, the granularity of the C is smaller than 1 micron, the purity of the BN is 99%, the granularity of the BN is smaller than 0.5 micron, the purity of the WC is 99.9%, the granularity of the WC is smaller than 0.4 micron, the purity of the TaC is 99.9%, the granularity of the TaC is smaller than 0.4 micron; and powder is prepared through grinding, 8 MPa prepressing is carried out, vacuum reaction hot-pressing sintering is carried out to form a blank, a blade is ground, and finally the metal ceramic cutting tool is prepared. Compared with the prior art, the carbide added metal ceramic cutting tool prepared through the method has the higher hardness and abrasive resistance, and obvious advantages exist in heat stability, abrasive resistance, thermal conductivity, inoxidizability, high temperature hardness, high-temperature strength and machinability.

Description

technical field [0001] The invention belongs to the technical field of new materials, and in particular relates to an ultrafine-grain high-performance Ti(C,N)-TiB2-WC-TaC composite cermet tool material and a preparation method. Background technique [0002] 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 phase i...

Claims

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Application Information

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IPC IPC(8): C22C1/05C22C29/04
CPCC22C1/058C22C29/04
Inventor 赵先锐张梦贤许辉薛双喜方一航冯尚申霍颜秋李战江陈基根吴建波
Owner TAIZHOU UNIV
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