Preparation method for B4C-ZrB2 multiphase ceramic material

A technology of multiphase ceramics, b4c-zrb2, is applied in the field of preparation of B4C-ZrB2 multiphase ceramic materials, and achieves the effect of easy realization and simple preparation process

Inactive Publication Date: 2014-08-20
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, boron powder and carbon black raw materials have not appeared, and ZrO 2 prepared as an additive by reactive hot pressing sintering of B 4 C-ZrB 2 Report on Composite Ceramics

Method used

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  • Preparation method for B4C-ZrB2 multiphase ceramic material
  • Preparation method for B4C-ZrB2 multiphase ceramic material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] B 4 C-ZrB 2 The preparation of composite ceramics, the specific method is as follows:

[0037] (1) Using boron powder (purity 96%, particle size 2 (purity is 99%, particle size is 2 The mass fraction of the powder is 10% for batching, with ethanol as the solvent and Si 3 N 4 The ball is a ball milling medium, mixed on a roller ball mill for 24 hours, after mixing and drying, a uniformly mixed B-C-ZrO 2 mixed powder;

[0038] (2) B-C-ZrO 2 The mixed powder is placed in a graphite mold coated with BN on the inner wall surface, and is sintered by reaction hot pressing in a vacuum. The sintering adopts a three-step heat preservation method, specifically: the first step, the heating rate is 15°C / min, and the temperature rises to 1050 ℃, keep warm for 1h; the second step, the heating rate is 10℃ / min, raise the temperature to 1600℃, keep warm for 1h; the third step, the heating rate is 10℃ / min, fill with argon and raise the temperature to 2000℃, and apply 30MPa at the sam...

Embodiment 2

[0041] According to the mass fraction of boron powder is 77.5%, the mass fraction of carbon black is 21.5%, the additive ZrO 2 The massfraction of powder is 1% and carries out batching, prepares B according to embodiment 1 method 4 C-ZrB 2 Composite ceramics, wherein, the batching roller ball mill is mixed for 24 hours; among them, the three-step heat preservation method is as follows: the first step, the heating rate is 20°C / min, the temperature rises to 1000°C, and the heat preservation is 2h; the second step, the heating rate 10°C / min, heat up to 1650°C, and hold for 2 hours; in the third step, the temperature rise rate is 10°C / min, fill with argon and heat up to 2100°C, while applying a pressure of 30MPa, hold for 1 hour. get B 4 C-ZrB 2 Composite ceramics.

[0042] The relative density of the ceramic material prepared in this example is 96.5%. The hardness of the material is 34GPa, and the fracture toughness is 3.5MPa m 1 / 2 , The bending strength is 500MPa.

Embodiment 3

[0044] According to the mass fraction of boron powder is 74.7%, the mass fraction of carbon black is 20.3%, the additive ZrO 2 The massfraction of powder is 5% to carry out batching, prepares B according to embodiment 1 method 4 C-ZrB 2 Composite ceramics, wherein, the batching roller ball mill is mixed for 24 hours; among them, the three-step heat preservation method is as follows: the first step, the heating rate is 15°C / min, the temperature rises to 1050°C, and the heat preservation is 2h; the second step, the heating rate 10°C / min, continue to heat up to 1600°C, and hold for 1 hour; in the third step, the temperature rise rate is 10°C / min, fill with argon and heat up to 2,000°C, while applying a pressure of 30MPa, hold for 1 hour. The relative density of the prepared ceramic material is 98%, the hardness of the material is 34GPa, and the fracture toughness is 3.7MPa m 1 / 2 , The bending strength is 600MPa.

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Abstract

The invention relates to the field of non-oxide-based ceramic materials and specifically discloses a preparation method for a B4C-ZrB2 multiphase ceramic material. According to the invention, boron powder and carbon black are used as raw materials and ZrO2 is used as an additive to prepare mixtures with different constituent contents, then batching and drying are carried out, and then a three-step insulation process in reactive hot-pressing sintering is employed to prepare the B4C-ZrB2 multiphase ceramic material. With the method, the compact B4C-ZrB2 multiphase ceramic material can be sintered at a temperature of 1900 to 2100 DEG C; and the ceramic material has relative density of greater than 96%, hardness of 25 to 38 GPa, breaking tenacity of 3.0 to 6.0 MPa.m1 / 2 and bending strength of 400 to 800 MPa.

Description

technical field [0001] The present invention relates to the field of non-oxide-based ceramic materials, more specifically, to a B 4 C-ZrB 2 Preparation method of composite ceramic material. Background technique [0002] Boron carbide (B 4 C) has high hardness (>30GPa), high melting point (2450°C), low density (2.52g / cm 3 ), excellent corrosion resistance, good neutron absorption capacity and a series of excellent physical and chemical properties such as semiconductivity, it is an excellent material for the preparation of mechanical seals and wear-resistant components, nuclear reactor shielding and control components, high-temperature semiconductor components, etc. . Since the 1930s, countries around the world have conducted extensive research on boron carbide ceramics and achieved good results. my country has also developed and produced hot-pressed sintered boron carbide ceramic products. [0003] Although B 4 C ceramics have ultra-high hardness, but B 4 C ceramic...

Claims

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Application Information

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IPC IPC(8): C04B35/563C04B35/622
Inventor 郭伟明游洋伍尚华
Owner GUANGDONG UNIV OF TECH
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