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A kind of preparation method of sic nanowire reinforced sibcn ceramics

A nanowire and ceramic technology, applied in the field of materials, can solve the problems of high production cost, low ceramic strength, complex process, etc., and achieve the effects of saving time, improving strength and toughness, and simple process operation.

Active Publication Date: 2017-06-06
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] In order to avoid the deficiencies of the prior art, the present invention proposes a method for preparing SiC nanowire-reinforced SiBCN ceramics, which solves the problems in the prior art such as complex process, high production cost, low output, low ceramic strength, and poor toughness. , to further promote the development and application of SiBCN ceramics

Method used

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  • A kind of preparation method of sic nanowire reinforced sibcn ceramics
  • A kind of preparation method of sic nanowire reinforced sibcn ceramics

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Experimental program
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Effect test

Embodiment 1

[0024] Step 1: raw material preparation: polyborosilazane (PBSZ) is cross-linked and cured at 200-250° C. for 2-3 hours under an argon or nitrogen atmosphere, and then ball-milled for 12-24 hours to obtain SiBCN powder.

[0025] Step 2: Powder mixing: SiBCN powder, SiC nanowires, sintering aids less than 10% by mass of the total mass and ethanol solution are mixed in proportion and ball milled to obtain a mixed slurry. The ball milling time is 12-24 hours, the ball milling drum speed is 100-150 r / min, the mass ratio of SiBCN powder and SiC nanowire in the mixed powder is 100:0; the sintering aids are aluminum oxide and yttrium oxide.

[0026] Step 3: Powder cracking: Dry the mixed slurry in an oven for 12-24 hours, then crack it at 800-900°C for 2-3 hours under a protective atmosphere, grind and pass through a 60-80 mesh screen to obtain a mixed powder.

[0027] Step 4: ceramic sintering: the mixed powder is subjected to spark plasma sintering to finally obtain SiBCN ceramics ...

Embodiment 2

[0028] Step 1: raw material preparation: polyborosilazane (PBSZ) is cross-linked and cured at 200-250° C. for 2-3 hours under an argon or nitrogen atmosphere, and then ball-milled for 12-24 hours to obtain SiBCN powder.

[0029] Step 2: Powder mixing: SiBCN powder, SiC nanowires, sintering aids less than 10% by mass of the total mass and ethanol solution are mixed in proportion and ball milled to obtain a mixed slurry. The ball milling time is 12-24 hours, the speed of the ball milling drum is 100-150 r / min, the mass ratio of SiBCN powder and SiC nanowire in the mixed powder is 100:4; sintering aids are magnesium oxide and zirconium oxide.

[0030] Step 3: Powder cracking: Dry the mixed slurry in an oven for 12-24 hours, then crack it at 800-900°C for 2-3 hours under a protective atmosphere, grind and pass through a 60-80 mesh screen to obtain a mixed powder.

[0031] Step 4: ceramic sintering: the mixed powder is subjected to spark plasma sintering to finally obtain SiBCN cer...

Embodiment 3

[0032] Step 1: raw material preparation: polyborosilazane (PBSZ) is cross-linked and cured at 200-250° C. for 2-3 hours under a protective atmosphere, and then ball-milled for 12-24 hours to obtain SiBCN powder.

[0033] Step 2: Powder mixing: SiBCN powder, SiC nanowires, sintering aids less than 10% by mass of the total mass and ethanol solution are mixed in proportion and ball milled to obtain a mixed slurry. The ball milling time is 12 to 24 hours, the speed of the ball milling drum is 100 to 150r / min, the mass ratio of SiBCN powder and SiC nanowire in the mixed powder is 100:6; the sintering aid is alumina, magnesium oxide, One or more of zirconia, yttrium oxide, ytterbium oxide, erbium oxide, scandium oxide, cerium oxide and other rare earth oxides.

[0034] Step 3: Powder cracking: Dry the mixed slurry in an oven for 12-24 hours, then crack it at 800-900°C for 2-3 hours under a protective atmosphere, grind and pass through a 60-80 mesh screen to obtain a mixed powder.

...

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Abstract

The invention relates to a method for fast preparation of a nanowire reinforced SiBCN ceramic. The method includes the steps of: 1. under protective atmosphere, subjecting polyborosilazane to crosslinking curing and ball-milling to obtain SiBCN powder; 2. preparing SiBCN powder, SiC nanowire, alumina, yttrium oxide and anhydrous ethanol in certain proportion, carrying out mixing, ball milling and drying; 3. subjecting the powder obtained in step 2 to cracking, grinding and sieving under protective atmosphere so as to obtain mixed powder; 4. carrying out spark plasma sintering on the mixed powder, thus obtaining the SiC nanowire reinforced SiBCN ceramic. The method provided by the invention makes full of the designability of the precursor conversion method, has the advantages of simple process, low temperature, and rapid sintering of SPS method, realizes preparation of SiC nanowire reinforced SiBCN ceramic, is suitable for densification of small dense parts, saves 95% of the time than traditional CVI and PDC methods, significantly improves the ceramic material density, and reduces the manufacturing cost of the ceramic material.

Description

technical field [0001] The invention belongs to the field of materials and relates to the preparation of SiBCN ceramics, and relates to a preparation method of SiC nanowire-reinforced SiBCN ceramics Background technique [0002] Due to the presence of more covalent bond structures in SiBCN ceramic materials, the material has high thermal stability, oxidation resistance, and creep resistance. Document 1 "Li Yajing, Zhang Yue, SiBCN ceramic precursor high temperature cracking mechanism, inorganic Journal of Materials Science, 2014, 29[3]:321-326". Due to the amorphous Si, C, N structure, this material has good high temperature stability and oxidation resistance, and can not crystallize, decompose and oxidize above 1500 °C. At present, the main method for preparing SiBCN ceramics is the transformation of organic precursors. Patent No. 103755348A discloses a silicon-boron-carbon-nitride ceramic and its preparation method. The method uses amines based on double-carbon chain or...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/80C04B35/58C04B35/622
Inventor 刘永胜门静张青王晶田卓成来飞张立同
Owner NORTHWESTERN POLYTECHNICAL UNIV