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Metal ceramic cutter with gradient structure and preparation method thereof

A cermet and gradient structure technology, applied in the field of cermet materials, can solve the problems of low comprehensive mechanical properties and high cost of cermet tools, and achieve the effects of good impact toughness, excellent high temperature oxidation resistance, and simple preparation methods

Active Publication Date: 2010-09-22
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention provides a gradient structure cermet cutter and a preparation method thereof, which solves the problems of high cost and low comprehensive mechanical properties of the prepared cermet cutter existing in the existing preparation method, so as to realize the combination of high hardness and high strength and toughness, and improve the Mechanical Properties of Cermet Cutting Tools

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] 1. Raw material preparation and mixing: using Ni powder and (Ti, W, Mo, Ta, Nb) (C, N) solid solution powder as components, prepare 7 groups of P01, P02, P03, P04, P05, P06 and P07 Raw materials, as shown in Table 1:

[0020] Table 1 Raw material composition

[0021] raw material

Ni (wt%)

(Ti, W, Mo, Ta, Nb) (C, N) (wt%)

P01

25

75

P02

23

77

P03

20

82

P04

18

82

P05

15

85

P06

12

88

P07

10

90

[0022] The prepared 7 groups of raw materials were respectively put into the ball mill tank and mixed with cemented carbide balls on a planetary ball mill for 24 hours at a speed of 250 rpm;

[0023] 2. Layered filling and compression molding: add 5wt% of molding agent polyvinyl alcohol to the above-mentioned 7 groups of P01, P02, P03, P04, P05, P06 and P07 after grinding, and add 5wt% of forming agent polyvinyl alcohol in turn, according to...

Embodiment 2

[0027] 1. raw material preparation and mixing: with Ni powder and (Ti, W, Mo, Ta, Nb) (C, N) solid solution powder as component, prepare 7 groups of raw materials according to table 1 in the embodiment 1; Prepared The 7 groups of raw materials were respectively put into the ball mill tank and mixed with cemented carbide balls on a planetary ball mill for 36 hours at a speed of 180rpm;

[0028] 2. Layered filling and compression molding: add 8wt% of forming agent polyvinyl alcohol to the above-mentioned 7 groups of P01, P02, P03, P04, P05, P06 and P07 after grinding, and add 8wt% of forming agent polyvinyl alcohol in turn, according to P01 →P02→P03→P04→P05→P06→P07→P06→P05→P04→P03→P02→P01 Fill the mold sequentially. After filling a group of mixed raw materials, push the mixed raw materials flat to facilitate filling layer by layer; then The compact is formed by molding, and the molding pressure is 150MPa.

[0029] 3. Degreasing: The green compact is degreased in a vacuum sinter...

Embodiment 3

[0032] 1. Preparation and mixing of raw materials: Ni powder and (Ti, W, Mo, Ta, Nb) (C, N) solid solution powder were used as components to prepare three groups of raw materials, T01, T02 and T03, as shown in Table 2:

[0033] Table 2 raw material composition

[0034] raw material

Ni (wt%)

(Ti, W, Mo, Ta, Nb) (C, N) (wt%)

T01

25

75

T02

15

85

T03

10

90

[0035] The prepared 3 groups of raw materials were respectively put into the ball mill tank and mixed with cemented carbide balls on a planetary ball mill for 30 hours at a speed of 200 rpm;

[0036]2. Layered filling and compression molding: add 3wt% of forming agent polyvinyl alcohol to the above-mentioned three groups of T01, T02 and T03 after grinding the same amount of mixed raw materials, and follow the sequence of T01→T02→T03→T02→T01 Fill the mold sequentially. After each group of mixed raw materials is filled, push the mixed raw materials flat ...

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Abstract

The invention discloses a metal ceramic cutter with a gradient structure and a preparation method thereof, belongs to a metal ceramic material, and solves the problem that the conventional method for preparing the metal ceramic cutter has higher cost and lower comprehensive mechanical property. The metal ceramic cutter of the invention is characterized in that a hard phase in finally generated phases is (Ti, W, Mo, Ta, Nb) (C, N) and a bonding phase is Ni, wherein the hard phase and the bonding phase are in symmetrical gradient distribution from a surface layer to a middle layer. The method of the invention sequentially comprises the steps of raw material preparation and mixing, layer-by-layer paving and compression molding, degreasing and vacuum sintering. The method is simple and has low cost; the surface hardness of the manufactured metal ceramic cutter is 92.5 to 92.8HRA, the bending strength is more than or equal to 2,000MPa, and the fracture toughness KIC is more than or equal to 12.0MPa.m<1 / 2>; and the metal ceramic cutter has the advantages of good high-temperature red hardness, abrasion resistance, chemical stability and impact toughness resistance and strong high-temperature oxidation resistance, is suitable for high-speed efficient cutting and processing and dry cutting, and can reduce the using amount of cutting fluid or does not use cutting fluid.

Description

technical field [0001] The invention belongs to cermet materials, and in particular relates to a gradient structure cermet cutter 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. Compared with WC-Co-based cemented carbide tools, Ti(C,N)-based cermet tools can be used at 700 ~1100℃ high temperature red hardness, wear resistance, oxidation resistance and adhesion resistance are good, its cutting speed and service life are increased by 3 to 10 times and 2 to 5 times respectively, and the main raw material resources are abundant and the cost is low. An ideal upgrade replacement product for WC-Co-based cemented carbide high-speed and high-efficiency cutting tools. [0003] However, in the existing Ti(C,N)-based cermets, the hardness and toughness appear in opposite forms. How to make it have high hardness and high strength and toughness at the same time i...

Claims

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Application Information

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IPC IPC(8): C22C29/04B22F3/16
Inventor 熊惟皓瞿峻杨青青姚振华蔺绍江李晓峰陈肖任爽戴鸿霞
Owner HUAZHONG UNIV OF SCI & TECH
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