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 high cost and low comprehensive mechanical properties of cermet tools, and achieve the effects of excellent high temperature oxidation resistance, good impact toughness and low cost

Active Publication Date: 2015-05-20
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: Ni powder and (Ti, W, Mo, Ta, Nb) (C, N) solid solution powder are used as components to prepare 7 groups of P01, P02, P03, P04, P05, P06 and P07 Raw materials, as shown in Table 1:

[0020] Table 1 Ingredients of raw materials

[0021] Raw materials

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] Put the prepared 7 groups of raw materials into the ball mill tank and use the cemented carbide balls to wet-grind the mixture on the planetary ball mill for 24 hours at 250 rpm;

[0023] 2. Layered filling and compression molding: add 5wt% of the molding agent polyvinyl alcohol to the 7 groups of the above P01, P02, P03, P04, P05, P06 and P07, and add 5wt% of the molding agent polyvinyl alcohol in sequence according to P01. →P02→P03→P04→P05→P06→P07→P06→P05→P04→P03→P02→P01 to fill the mold in sequence. After each group of mi...

Embodiment 2

[0027] 1. Raw material preparation and mixing: Take Ni powder and (Ti, W, Mo, Ta, Nb) (C, N) solid solution powder as components, prepare 7 groups of raw materials according to Table 1 in Example 1; The 7 groups of raw materials were put into the ball mill tank, and the cemented carbide balls were used for wet grinding and mixing on the planetary ball mill. The time was 36 hours and the rotation speed was 180 rpm;

[0028] 2. Layered filling and compression molding: the same amount of mixed raw materials after the 7 groups of P01, P02, P03, P04, P05, P06 and P07 are ground and added 8wt% of the forming agent polyvinyl alcohol, followed by P01 →P02→P03→P04→P05→P06→P07→P06→P05→P04→P03→P02→P01 to fill the mold in sequence. After each group of mixed materials is filled, the mixed materials are pushed and leveled to facilitate filling layer by layer; The compact is formed by compression molding, and the compression pressure is 150MPa.

[0029] 3. Debinding: the compact is debinding in ...

Embodiment 3

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

[0033] Table 2 Ingredients of raw materials

[0034] Raw materials

Ni(wt%)

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

T01

25

75

T02

15

85

T03

10

90

[0035] Put the prepared 3 groups of raw materials into the ball mill tank and use the cemented carbide balls to wet-grind the mixture on the planetary ball mill for 30 hours and rotate at 200 rpm;

[0036] 2. Layered filling and compression molding: add 3wt% of the molding agent polyvinyl alcohol to the same amount of mixed raw materials after grinding the above three groups of T01, T02 and T03, and follow the order of T01→T02→T03→T02→T01 The mold is filled sequentially. After each group of mixed raw materials is filled, the mixed raw materials are pushed and flattened to facilitate filling layer by layer; the...

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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 a cermet material, and specifically relates to a cermet tool with a gradient structure 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 are less than 700 ~1100℃ high temperature red hardness, wear resistance, oxidation resistance and adhesion resistance are good, its cutting speed and service life are increased by 3-10 times and 2-5 times respectively, and the main raw material resources are abundant, and the cost is low. WC-Co-based cemented carbide is an ideal upgrade replacement product for high-speed and high-efficiency cutting tools. [0003] However, the existing Ti(C, N)-based cermets have opposite hardness and strength and toughness. How to make them have both high hardness and high strength and toughness is a worldwide techni...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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