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A WC composite material synergistically toughened by β-Si3N4 whiskers and Ni3Al binder phase and its preparation method

A composite material, -si3n4 technology, applied in the field of alloy material preparation, can solve problems such as no related reports, and achieve the effects of good oxidation resistance, good wettability, and high hardness

Active Publication Date: 2018-07-20
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Currently using β-Si 3 N 4 Whisker toughened WC-Ni 3 Research on Al composites has not been reported yet

Method used

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  • A WC composite material synergistically toughened by β-Si3N4 whiskers and Ni3Al binder phase and its preparation method
  • A WC composite material synergistically toughened by β-Si3N4 whiskers and Ni3Al binder phase and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] a β-Si 3 N 4 Whiskers and Ni 3 Al binder phase synergistically toughened WC composites were prepared by the following method:

[0044] The initial powders of Ni, Al, Fe, Cr, Zr and B according to weight percentage (wt.%): Ni 69.38%, Al10.50%, Fe 10.90%, Cr 8.12%, Zr 0.89%, B 0.21%, set Carry out high-energy ball milling on the ball mill, the weight ratio of balls to materials is 10:1, and the speed is 226 r / min. Argon protects the powder so that it will not be oxidized; Ni 3 Al intermetallic compound;

[0045] (1) 96wt.% α-Si 3 N 4 Powder and 4wt.% Y 2 o 3 The powder was placed in a ball mill for wet ball milling at a speed of 180 r / min, the ball milling time was 10 h, and the ball-to-material ratio was 10:1 to obtain a ball mill slurry;

[0046] (2) Dry the ball mill slurry prepared in step (2) in a vacuum drying oven, and place the dried mixed powder in an atmosphere furnace for atmosphere sintering. The atmosphere sintering parameters are: 0.01MPa N 2 air p...

Embodiment 2

[0054] Example 2 A kind of β-Si 3 N 4 Whiskers and Ni 3 Al binder phase synergistically toughened WC composites were prepared by the following method:

[0055] Steps (1) to (6) are the same as in Example 1;

[0056] (7) Take 20g of the dried composite powder and put it into a cylindrical graphite mold with an inner diameter of Ø20 mm and an outer diameter of Ø50 mm. The powder, the die and the punch are separated by graphite paper for demoulding. The mold is also covered with a layer of 10 mm thick graphite felt to reduce heat radiation loss; the graphite mold with composite powder is placed in a spark plasma sintering furnace for sintering, and the sintering parameters are: the sintering current type is DC pulse current, and the sintering The atmosphere is low vacuum (≤ 6 Pa), the sintering pressure is 40MPa, the heating rate is 150°C / min, the temperature measurement method is infrared temperature measurement (≥ 570°C), the sintering temperature is 1400°C, and the holding ...

Embodiment 3

[0058] Example 3 A β-Si 3 N 4 Whiskers and Ni 3 Al binder phase synergistically toughened WC composites were prepared by the following method:

[0059] Steps (1) to (6) are the same as in Example 1;

[0060] (7) Take 20g of the dried composite powder and put it into a cylindrical graphite mold with an inner diameter of Ø20 mm and an outer diameter of Ø50 mm. The powder, the die and the punch are separated by graphite paper for demoulding. The mold is also covered with a layer of 10 mm thick graphite felt to reduce heat radiation loss; the graphite mold with composite powder is placed in a spark plasma sintering furnace for sintering, and the sintering parameters are: sintering current is DC pulse current, sintering atmosphere It is low vacuum (≤ 6 Pa), the sintering pressure is 50MPa, the heating rate is 100℃ / min, the temperature measurement method is infrared temperature measurement (≥ 570℃), the sintering temperature is 1350℃, and the holding time is 8 minutes; the β-Si ...

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Abstract

The invention discloses a beta-Si3N4 whisker and Ni3Al binding phase synergistic toughened WC composite and a preparation method thereof. The composite comprises the following components of, by mass, 86%-92% of WC, 6% of Ni3Al intermetallic compounds and 2%-8% of beta-Si3N4 whiskers. The preparation method comprises the following steps that (1) the WC powder, the intermetallic compounds corresponding to the Ni3Al binding phase and an organic solvent are subjected to wetted ball grinding, and WC-Ni3Al composite powder paste is obtained; and (2) the beta-Si3N4 whiskers, the WC-Ni3Al composite powder paste and organic solvent are subjected to low-energy wetted ball grinding, drying, sieving and sintering solidification, and the beta-Si3N4 whisker and Ni3Al binding phase synergistic toughened WC composite is obtained. The beta-Si3N4 whisker and Ni3Al binding phase synergistic toughened WC composite has very high hardness, abrasion resistance and oxidation resistance and good toughness and is suitable for serving as a cutter material or a mold material.

Description

technical field [0001] The invention belongs to the technical field of alloy material preparation, in particular to a β-Si 3 N 4 Whiskers and Ni 3 Al binder phase synergistically toughened WC composites and its preparation method. Background technique [0002] For decades, WC-Co cemented carbide has always occupied the dominant position of cemented carbide products, mainly because WC has a high hardness, the Rockwell hardness can reach 94HRA, and Co has excellent toughness and plasticity, and has a strong influence on WC. The wettability is very good, so WC-Co cemented carbide can bear a lot of pressure due to the skeleton formed by WC grains under stress conditions, showing high hardness; on the other hand, Co as a binder phase It absorbs energy through deformation, inhibits the expansion of cracks, and exhibits high toughness. Therefore, WC-Co cemented carbide has excellent transverse fracture strength and hardness at the same time, and is widely used in various related...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C49/14C22C49/02C22C47/14C22C101/18
CPCC22C47/14C22C49/02C22C49/14
Inventor 李小强杨帆屈盛官梁良李京懋曹庭
Owner SOUTH CHINA UNIV OF TECH
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