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TiC crystal whisker-reinforced metal ceramic and preparation method thereof

A cermet and whisker technology, which is applied in the field of cermet and its preparation, can solve the problems of poor wettability of SiC whiskers and inconspicuous effect of toughness, etc., achieve good stability, not easy to grow and coarsen, and improve strength The effect of toughness

Active Publication Date: 2014-09-03
HUAZHONG UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The invention patent with the publication number CN100545127C "SiC whisker toughened titanium carbonitride-based cermet cutting blade and its preparation method" uses SiC whisker as a reinforcing agent to treat Ti(C,N)-Ni-Co-based cermet Modified, but the wettability of the bond relative to SiC whiskers is poor, so the effect of increasing the strength and toughness is not obvious

Method used

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  • TiC crystal whisker-reinforced metal ceramic and preparation method thereof
  • TiC crystal whisker-reinforced metal ceramic and preparation method thereof
  • TiC crystal whisker-reinforced metal ceramic and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Embodiment 1: including raw material mixing step, TiC whisker dispersion step, drying and sieving step, molding step, degreasing step and vacuum sintering step:

[0023] (1). Raw material mixing step: mix Ti(C,N) powder, TiC whisker, WC powder, Mo powder, C powder and Ni powder respectively according to the mass percentages shown in the formula numbers A1-A5 in Table 1; Mix the Ti(C,N) powder, WC powder, Mo powder, C powder and Ni powder in the formula numbers A1 to A5, and use a ball mill to wet grind, the mass ratio of ball to material is 5:1, the rotation speed is 120rpm, and the time is 24h to obtain the mixed Slurry B1-B5, wherein the particle size of Ti(C,N) powder is less than or equal to 200nm, the diameter of TiC whisker is 0.4-0.8μm, and the length is 10-60μm;

[0024] Table 1 TiCw reinforced cermet ingredient list

[0025]

[0026] (2). TiC whisker dispersing step: Put the TiC whiskers in the formula numbers A1 to A5 into the polar solvent ethanol, and ma...

Embodiment 2

[0035] Embodiment 2: including raw material mixing step, TiC whisker dispersion step, drying and sieving step, molding step, degreasing step and vacuum sintering step:

[0036] (1). Raw material mixing step: mix Ti(C,N) powder, TiC whisker, WC powder, Mo powder, C powder and Ni powder according to the mass percentages shown in the formula numbers E1-E8 in Table 4; The Ti(C,N) powder, WC powder, Mo powder, C powder and Ni powder in the serial numbers E1-E8 were mixed, and wet-milled by a ball mill with a ball-to-material ratio of 7:1 (mass ratio), a rotational speed of 220rpm, and a time of 36h to obtain Mixed slurry F1-F8, wherein the particle size of Ti(C,N) powder is less than or equal to 200nm, the diameter of TiC whisker is 0.4-0.8μm, and the length is 10-60μm;

[0037] Table 4 TiC whisker reinforced cermet ingredient list

[0038]

[0039] (2). TiC whisker dispersing step: Put the TiC whiskers in the formula numbers E1 to E8 into the polar solvent ethanol respectively...

Embodiment 3

[0049] Embodiment 3: including raw material mixing step, TiC whisker dispersion step, drying and sieving step, molding step, degreasing step and vacuum sintering step:

[0050] (1). Raw material mixing step: batching according to mass percentage: Ti(C,N) powder 35%, TiC whisker 15%, WC powder 10%, Mo powder 12%, C powder 1.0% and Ni powder 27%; The Ti(C,N) powder, WC powder, Mo powder, C powder and Ni powder were mixed, wet milled with a ball mill, the mass ratio of the ball to material was 6:1, the speed of the ball mill was 180rpm, and the ball milling time was 36h to obtain a mixed slurry. Among them, the particle size of Ti(C,N) powder is less than or equal to 200nm, the diameter of TiC whisker is 0.4-0.8μm, and the length is 10-60μm;

[0051] (2). Step of dispersing TiC whiskers: put TiC whiskers with a mass fraction of 15% into a polar solvent ethylene glycol, and make a suspension solution by ultrasonic vibration to ensure stable dispersion of TiC whiskers. Then the Ti...

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Abstract

The invention discloses a TiC crystal whisker-reinforced metal ceramic and a preparation method thereof, belongs to metal ceramic and a preparation method thereof, and aims at improving bending strength and breaking tenacity of the existing Ti(C,N)-based metal ceramic. The TiC crystal whisker-reinforced metal ceramic disclosed by the invention is prepared from constituent material through ball-milling and mixing, TiC crystal whisker dispersing, drying and screening, die-forming, degreasing and vacuum-sintering, wherein a sintering tissue comprises a hard phase and a binding phase; the hard phase comprises two ceramic phases, and the binding phase is Ni-Mo-W sosoloid. The constituent materials comprise the following materials in percentage by weight: not less than 23% and not greater than 55.2% of Ti(C, N) powder, not less than 10% and not greater than 30% of TiC crystal whisker, not less than 6% and not greater than 10% of WC powder, not less than 8% and not greater than 15% of Mo powder, not less than 0.8% and not greater than 1.2% of C powder, not less than 20% and not greater than 32% of Ni powder. The TiC crystal whisker-reinforced metal ceramic prepared by the method disclosed by the invention has hardness capable of reaching 87.6 HRA-91.8 HRA, bending strength not less than 1920 MPa and breaking tenacity not less than 14.2MPa.m / 2, which are greatly improved, and has good popularization and application prospect in dry type cutting tools, hot-working dies, and the like.

Description

technical field [0001] The invention belongs to cermets and a preparation method thereof, in particular to a TiC whisker-reinforced cermet and a preparation method thereof. Background technique [0002] Ti(C,N)-based cermet is a new type of particle-reinforced composite material that appeared in the early 1970s. It has good high-temperature red hardness, wear resistance, thermal stability and anti-adhesion. Its low density makes it an ideal material for cutting tools and thermoforming dies. Industrially developed countries in the world attach great importance to the basic research of cermets and their product development, especially in Japan, where resources are scarce, and its cermet tools and molds have been popularized and applied in the fields of turning tools, milling cutters, drills, and gear hobs. my country started late in this area. So far, the popularization and application of commercial cermets is still very limited, mainly due to the low toughness and unstable p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C29/06C22C1/05
Inventor 熊惟皓张国鹏陈珊姚振华陈肖黄斌杨青青张曼
Owner HUAZHONG UNIV OF SCI & TECH
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