a wcob-b 4 C preparation method of ceramic matrix composite material

A composite material, wcob-b4c technology, applied in the field of preparation of WCoB-B4C ceramic matrix composite materials, can solve the problems of high brittleness, easy formation of coarse grains, high density of WCoB-based cermets, etc. The effect of good high temperature wear performance and high hardness

Active Publication Date: 2020-06-19
XI AN JIAOTONG UNIV
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Problems solved by technology

[0004] Although WCoB-based cermets have good toughness, wear resistance and high temperature resistance, and stable physical and chemical properties, they can be used as high-speed cutting tool materials, but a single WCoB-based cermet has a high density and is easy to form coarse grains during the preparation process. And more brittle

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  • a wcob-b <sub>4</sub> C preparation method of ceramic matrix composite material

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preparation example Construction

[0030] A WCoB-B of the present invention 4 The preparation method of C ceramic matrix composite material, comprises the following steps:

[0031] S1. Weigh W powder, Co powder, C powder and B powder for powder mixing, wherein the mass fraction of W powder is 65.6-69.1%, the mass fraction of Co powder is 26.5-28.8%, and the mass fraction of C powder is 0.5% %, the mass fraction of B powder is 4.0-5.2%;

[0032] S2. Put the mixed powder prepared in step S1 into a ball mill tank for ball milling;

[0033] Among them, the ball milling process parameters are: wet milling in a ball mill for 20-40 hours, wherein the ball milling medium is absolute ethanol, the ball-to-material ratio is 5:1, and the balls are silicon nitride balls.

[0034] S3. After the ball milling in step S2 is completed, put the ball milled powder into a vacuum drying oven to dry, keep it warm at 70°C for 8 hours, and then pass the dried powder through a 150-200-mesh sieve;

[0035] S4, filling the mixed powder...

Embodiment 1

[0041] Select typical WCoB-B 4 The formula of C ceramic matrix composite material, the mass fraction of its raw material component is: 68% W powder (purity: 99.99%, particle size: 100 mesh), 27% Co powder (purity: 99.9%, particle size: 100 mesh) , 0.5% C powder (purity: 99.9%, particle size: 200 mesh), 4.5% B powder (purity: 99.99%, particle size: 200 mesh);

[0042] (2) Each powder is weighed by an electronic balance with an accuracy of 0.1 mg, and put into a ball mill jar for ball milling, wet milling for 20 hours, the ball milling medium is absolute ethanol, and the ball-to-material ratio is 5:1;

[0043](3) Put the ball-milled powder into a vacuum drying oven to dry, keep it warm at 60°C for 8 hours, and then pass the dried powder through a 150-mesh sieve;

[0044] (4) Fill the mixed powder into the mould, press and form, the pressing pressure is 150MPa, and the holding pressure is 5min;

[0045] (5) Put the compact into 10 -1 Sintering was carried out in a Pa vacuum si...

Embodiment 2

[0054] (1) Select a typical WCoB-B 4 The formula of C ceramic matrix composite material, the mass fraction of its raw material components is: 68% W powder (purity: 99.99%, particle size: 100 mesh), 27% Co powder (purity: 99.9%, particle size: 100 mesh) , 0.5% C powder (purity: 99.9%, particle size: 200 mesh), 4.5% B powder (purity: 99.99%, particle size: 200 mesh);

[0055] (2) Each powder is weighed by an electronic balance with an accuracy of 0.1 mg, and put into a ball mill tank for ball milling, wet milling for 40 hours, the ball milling medium is absolute ethanol, and the ball-to-material ratio is 5:1;

[0056] (3) Put the ball-milled powder into a vacuum drying oven to dry, keep it warm at 70°C for 8 hours, and then pass the dried powder through a 180-mesh sieve;

[0057] (4) Fill the mixed powder into the mould, press and form, the pressing pressure is 100MPa, and the holding pressure is 10min;

[0058] (5) Put the compact into a 10-1Pa vacuum sintering furnace for si...

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Abstract

The invention discloses a preparation method of a WCoB-B<4>C ceramic matrix composite material. The preparation method of the WCoB-B<4>C ceramic matrix composite material comprises the steps that powder blending is carried out on 65.6%-69.1% of W powder, 26.5%-28.8% of Co powder, 0.5% of C powder and 4.0%-5.2% of B powder by mass fraction, wet method ball milling treatment is carried out on the mixed powder, the treated powder is pressed into shapes after dried and sifted, and finally, the WCoB-B<4>C ceramic matrix composite material is manufactured by vacuum sintering. The preparation methodof the WCoB-B<4>C ceramic matrix composite material is simple in process, and the obtained WCoB-B<4>C ceramic matrix composite material has the characteristics of high hardness, high using temperatureand good high temperature resistance abrasion performance.

Description

technical field [0001] The invention belongs to the technical field of tool materials, in particular to a WCoB-B 4 C The preparation method of the ceramic matrix composite material. Background technique [0002] In the field of machining, cutting is still the main process for the final formation of parts. Advances in cutting tool materials are one of the decisive factors in machining technology. One of the main development directions of cutting processing is high-speed cutting. During high-speed cutting, as the cutting speed increases, the cutting force gradually decreases, the cutting temperature rise gradually slows down, the processed surface quality improves, and the processing cost decreases. In order to achieve high-speed cutting, it is necessary to research and develop tool materials suitable for high-speed cutting. [0003] At present, common metal cutting knives include high-speed steel, cemented carbide and ceramics. During high-speed cutting, the tip of the t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/04B22F3/10B22F3/02C22C1/05C22C29/00C22C1/10
CPCB22F3/02B22F3/1007B22F9/04B22F2009/043B22F2201/20B22F2999/00C22C1/05C22C29/005B22F3/10
Inventor 李克敏皇志富李烨飞张磊申宇鹏刘志伟李博郑巧玲
Owner XI AN JIAOTONG UNIV
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