A kind of superfine boron nitride porous fiber toughened WC composite material and preparation method thereof

A porous fiber and composite material technology, applied in the field of alloy materials, can solve the problems of toughened WC composite materials that have not been reported, and achieve high hardness, good oxidation resistance, and improved toughness

Active Publication Date: 2019-05-14
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no report on the preparation of toughened WC composites by using ultrafine boron nitride porous fibers

Method used

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  • A kind of superfine boron nitride porous fiber toughened WC composite material and preparation method thereof

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Effect test

Embodiment 1

[0028] A kind of superfine boron nitride porous fiber toughened WC composite material of this embodiment is prepared by the following method:

[0029] (1) 99.95g WC (0.2μm, purity >99.9%, Xuzhou Jiexin Material Technology Co., Ltd.), 0.05g ultrafine boron nitride porous fiber (outer diameter 20-60nm, Hebei University of Technology Boron Nitride Material Research Center ), pour in the 250ml cemented carbide jar, then add ethanol as solvent (the volume of gained mixed slurry is no more than 2 / 3 of ball mill jar volume), obtain mixed slurry; The ball mill jar that mixed slurry is housed is placed Carry out wet ball milling (rotating speed 180r / min, ball milling time is 30h) on planetary ball mill, obtain ball mill slurry;

[0030] (2) placing the ball mill slurry in a vacuum drying oven to dry until the residual solvent content is ≤1%, taking out the dried powder, crushing, and sieving to obtain a composite powder with a particle size of ≤300 μm;

[0031] (3) Take 28g of composi...

Embodiment 2

[0035] A kind of superfine boron nitride porous fiber toughened WC composite material of this embodiment is prepared by the following method:

[0036] Steps (1)~(2) are identical with embodiment 1;

[0037] (3) Take 28g of composite powder and put it into the inner diameter and outer diameter In the cylindrical graphite mold, the powder, the die and the punch are separated by graphite paper for demoulding, and the die is also covered with a layer of 10mm thick graphite felt to reduce heat radiation loss; The graphite mold filled with composite powder is placed in a spark plasma sintering furnace for sintering to obtain ultrafine boron nitride porous fiber toughened WC composite material. The sintering parameters are: the sintering current type is DC pulse current, the sintering atmosphere is low vacuum (≤6Pa), the sintering pressure is 30MPa, the heating rate is 100°C / min, and the temperature measurement method is infrared temperature measurement (≥570°C), The sintering t...

Embodiment 3

[0040] A kind of superfine boron nitride porous fiber toughened WC composite material of this embodiment is prepared by the following method:

[0041] Steps (1)~(2) are identical with embodiment 1;

[0042] (3) Take 28g of composite powder and put it into the inner diameter and outer diameter In the cylindrical graphite mold, the powder, the die and the punch are separated by graphite paper for demoulding, and the die is also covered with a layer of 10mm thick graphite felt to reduce heat radiation loss; The graphite mold containing the composite powder was placed in a spark plasma sintering furnace for sintering to obtain ultrafine boron nitride nanofiber toughened WC composites. The sintering parameters are: the sintering current type is DC pulse current, the sintering atmosphere is low vacuum (≤6Pa), the sintering pressure is 50MPa, the heating rate is 300°C / min, and the temperature measurement method is infrared temperature measurement (≥570°C), The sintering temperatu...

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Abstract

The invention belongs to the technical field of alloy materials and discloses a superfine porous boron nitride fiber toughened WC composite and a preparation method thereof. The composite comprises 99.75wt%-99.99wt% of WC, 0.01wt%-0.25wt% of superfine porous boron nitride fibers and inevitable trace impurities. The preparation method comprises the following steps: WC powder, the superfine porous boron nitride fibers and an organic solvent are placed in a ball mill for wet ball milling, and ball-milled slurry is obtained; the ball-milled slurry is dried, then the slurry is sieved after the solvent is removed, and composite powder with the particle size smaller than or equal to 300 mu m is obtained; the composite powder is placed in a mold, sintered, cured and formed, and a product is obtained. The WC composite is toughened by the superfine porous boron nitride fibers, contains no metal bonder phases, has very high hardness, wear resistance and oxidation resistance and better toughness and is suitable for being used as a cutter material or a mold material.

Description

technical field [0001] The invention belongs to the technical field of alloy materials, and in particular relates to a superfine boron nitride porous fiber toughened WC composite material and a preparation method thereof. Background technique [0002] WC-Co cemented carbide is a common and important cemented carbide type (YG series), which is widely used in the fields of modern cutting tool materials, wear-resistant, corrosion-resistant and high-temperature resistant materials, and is known as the tooth of modern industry . Pure WC materials are difficult to be sintered densely, even if sintered densely, the sintering temperature is often above 2000°C, which is easy to cause damage to the equipment, and the fracture toughness after sintering is only ~4MPa·m 1 / 2 . As a binder phase of WC sintering, Co has very good wettability to WC, and at the same time can reduce the sintering temperature of WC to ~1400°C. During sintering, Co becomes a liquid phase, which greatly increas...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/80C04B35/56
CPCC04B35/5626C04B35/806C04B2235/524C04B2235/666C04B2235/77C04B2235/96
Inventor 李小强曹廷屈盛官黄阳梁良伍尚华
Owner SOUTH CHINA UNIV OF TECH
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