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Preparation method of boron carbide-based ceramic composite material based on particle grading

A ceramic composite material, boron carbide-based technology, applied in the field of materials, can solve the problems of low activation energy, difficulty, large grain boundary movement resistance, etc., and achieve the effects of high green body density, improved performance, and uniform structure

Active Publication Date: 2019-10-08
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the strong covalent bonding between boron carbide ceramic atoms, the large movement resistance of the grain boundary, and the low sintering activation energy, it is extremely difficult to obtain a high-density sintered body, which usually requires extremely high temperature for sintering. The sintering temperature is usually at Around 2000℃

Method used

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  • Preparation method of boron carbide-based ceramic composite material based on particle grading
  • Preparation method of boron carbide-based ceramic composite material based on particle grading
  • Preparation method of boron carbide-based ceramic composite material based on particle grading

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Embodiment 1

[0062] A method for preparing boron carbide-based ceramic composites based on particle gradation, comprising the following steps: B 4 C powder is mixed evenly with absolute ethanol at a ratio of 0.14:0.43:0.14:0.29, fully dried and ground into powder for later use.

[0063] Mix acrylamide, methylenebisacrylamide, tetramethylammonium hydroxide with deionized water, mass ratio, acrylamide and deionized water mass ratio=0.15, acrylamide and methylenebisacrylamide mass ratio= 48. The mass ratio of tetramethylammonium hydroxide aqueous solution to deionized water = 0.027, stirred until completely dissolved to form a mixed solution, added in advance by different specifications B 4 Mixed powder prepared by C powder to form water-based B 4 C mixed slurry; wherein, the content of boron carbide in the mixed slurry is 60vol%.

[0064] The mixed slurry is vacuum degassed for 5 minutes, and ammonium persulfate solution is added, and the added mass of the ammonium persulfate solution is 0...

Embodiment 2

[0075]A method for preparing a boron carbide-based ceramic composite material based on particle gradation, comprising the following steps: B 4 C powder is mixed evenly with absolute ethanol at the ratio of 0.19:0.14:0.25:0.42, fully dried and ground into powder for later use.

[0076] Mix acrylamide, methylenebisacrylamide, tetramethylammonium hydroxide with deionized water, by mass ratio, the mass ratio of acrylamide to deionized water=0.16, and the mass ratio of acrylamide to methylenebisacrylamide= 50, the mass ratio of tetramethylammonium hydroxide aqueous solution and deionized water = 0.029, stir until completely dissolved, add in advance by different specifications B 4 Mixed powder prepared by C powder to form water-based B 4 C mixed slurry; wherein, the content of boron carbide in the mixed slurry is 63vol%.

[0077] The mixed slurry is vacuum degassed for 5 minutes, and ammonium persulfate solution is added, and the added mass of the ammonium persulfate solution is ...

Embodiment 3

[0082] A method for preparing a boron carbide-based ceramic composite material based on particle gradation, comprising the following steps: B 4 C powder is mixed evenly with absolute ethanol at a ratio of 0.2:0.15:0.65, fully dried and ground into powder for later use.

[0083] Mix acrylamide, methylenebisacrylamide, tetramethylammonium hydroxide with deionized water, by mass ratio, the mass ratio of acrylamide to deionized water=0.16, and the mass ratio of acrylamide to methylenebisacrylamide= 48. The mass ratio of tetramethylammonium hydroxide aqueous solution to deionized water = 0.027, stir until completely dissolved, add in advance by different specifications B 4 Mixed powder prepared by C powder to form water-based B 4 C mixed slurry; wherein, the content of boron carbide in the mixed slurry is 60vol%.

[0084] The mixed slurry is vacuum degassed for 5 minutes, and ammonium persulfate solution is added, and the ammonium persulfate solution is added in a mass of 0.5% of...

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Abstract

The invention discloses a preparation method of a boron carbide-based ceramic composite material based on particle grading. The preparation method comprises the following steps: uniformly mixing B4C powder with different specifications according to a ratio, and carrying out grinding for later use; taking water as a solvent and taking acrylamide, methylene bisacrylamide and tetramethylammonium hydroxide as solutes to prepare a premixed solution according to a ratio, adding the B4C mixed powder, then adding an initiator for injection molding and curing, and carrying out drying and carbonizing toobtain a B4C green body; and placing Si onto the B4C green body, and carrying out vacuum infiltration to obtain the boron carbide ceramic composite material. The method disclosed by the invention issimple, and the obtained green body is high in relative density; the green body can be processed mechanically and can be prepared into a product with a complicated shape; the sintering temperature islow, and the low-density B4C composite material with uniform and controllable tissue and excellent comprehensive mechanical properties can be prepared at relatively low cost; the product has a low density and high specific strength; the size change of the product after sintering is less than 1%, and the sintering process belongs to net-size sintering.

Description

Technical field: [0001] The invention belongs to the technical field of materials, and in particular relates to a method for preparing a boron carbide-based ceramic composite material based on particle gradation. Background technique: [0002] Boron carbide (B 4 C) Ceramics occupy an important position in structural ceramics. It has many excellent properties, the most prominent properties of which are high hardness and low density. At room temperature, its hardness is second only to diamond and cubic boron nitride. At the same time, boron carbide ceramics also have the characteristics of high modulus, good wear resistance, excellent neutron absorption performance, high melting point, good electrical conductivity, superior chemical corrosion resistance, etc., and have been widely used abroad as bulletproof armor materials, high-temperature structural materials, atomic reactor control and shielding materials, wear-resistant materials, acid and alkali corrosion-resistant mater...

Claims

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Application Information

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IPC IPC(8): C04B35/563C04B35/622C04B35/63C04B35/632
CPCC04B35/563C04B35/622C04B35/6303C04B35/632C04B2235/428C04B2235/5427C04B2235/5436C04B2235/61C04B2235/616C04B2235/77C04B2235/96
Inventor 张翠萍茹红强夏乾
Owner NORTHEASTERN UNIV