Preparation method of BCN nano amorphous phase toughened TiB2-B4C composite ceramic

A technology of tib2-b4c and multi-phase ceramics, which is applied in the field of high-performance structural ceramics preparation, can solve the problems of high brittleness, difficulty in sintering and densification of finished products, and low diffusion rate, so as to prevent crystallization, reduce sensitivity, and high sintering efficiency Effect

Active Publication Date: 2021-08-06
NANJING INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, B 4 The molecular structure of C is mostly composed of strong covalent bonds, and the diffusion rate is low under high temperature conditions, which makes it difficult to sinter and densify the finished product, and has high brittleness.

Method used

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  • Preparation method of BCN nano amorphous phase toughened TiB2-B4C composite ceramic
  • Preparation method of BCN nano amorphous phase toughened TiB2-B4C composite ceramic
  • Preparation method of BCN nano amorphous phase toughened TiB2-B4C composite ceramic

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Effect test

Embodiment 1

[0025] Aluminum nitride powder (average particle size 1 μm), boron carbide powder (average particle size 3 μm), metal Ti powder (average particle size 5 μm), metal aluminum powder (average particle size 2 μm), polyethylene Glycol (molecular weight 2000) and ethanol are mixed according to the mass ratio of 1:7:2:0.1:0.2:20, in which Al powder is used as sintering aid and reactive agent, and stirred for 1 hour to obtain a mixed slurry; then the mixed slurry Put it into a polytetrafluoroethylene tank for ball milling for 24 hours, the ball milling rate is 300r / min, and the ball milling medium is zirconia balls. After ball milling, the slurry is sieved to obtain a mixed slurry; the slurry is dried in a vacuum oven at 80°C for 8 hours, and then The multi-phase ceramic powder was obtained by sieving; the multi-phase ceramic powder was placed in a graphite mold, sintered and kept at 1720°C for 6 minutes in a vacuum, and the heating rate was 120°C / min. The resulting BCN nano-amorphous...

Embodiment 2

[0027] Aluminum nitride powder (average particle size 1 μm), boron carbide powder (average particle size 3 μm), metal Ti powder (average particle size 5 μm), metal aluminum powder (average particle size 2 μm), polyethylene Glycol (molecular weight 2000) and ethanol are mixed according to the mass ratio of 1:7:2:0.2:0.2:20, in which Al powder is used as sintering aid and reactive agent, and stirred for 1h to obtain a mixed slurry; then the mixed slurry Put it into a polytetrafluoroethylene tank for ball milling for 24 hours, the ball milling rate is 300r / min, and the ball milling medium is zirconia balls. After ball milling, the slurry is sieved to obtain a mixed slurry; the slurry is dried in a vacuum oven at 80°C for 8 hours, and then The multi-phase ceramic powder was obtained by sieving; the multi-phase ceramic powder was placed in a graphite mold, sintered and kept at 1670°C for 5 minutes in a vacuum, and the heating rate was 100°C / min. The resulting BCN nano-amorphous pha...

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Abstract

The invention relates to a preparation method of BCN nano amorphous phase toughened TiB2-B4C composite ceramic, and belongs to the technical field of preparation of high-performance structural ceramic. According to the preparation method disclosed by the invention, the content proportion of each phase component in the raw material powder of the composite ceramic and the preparation process are limited, so that the BCN nano amorphous phase strengthened and toughened TiB2-B4C composite ceramic is prepared. The nano amorphous phase is an effective means for strengthening and toughening ceramic, and the main implementation ways comprise dispersion refinement, mixed crystal structure strengthening, pinning theory, residual stress field theory and the like. The invention aims to prepare a nano amorphous phase through an in-situ reaction, change the microstructure of TiB2-B4C composite ceramic and further improve the particle bonding mode and fracture mode of the TiB2-B4C composite ceramic, so that the strength and toughness of the ceramic material are improved, and a novel strengthening and toughening means of the structural ceramic material is provided.

Description

technical field [0001] The invention belongs to the technical field of preparation of high-performance structural ceramics, and relates to a BCN nano-amorphous phase toughened TiB 2 -B 4 C preparation method of composite ceramics. Background technique [0002] Advanced structural ceramics have low density, high modulus, high hardness, high compressive strength and excellent anti-ballistic performance, which can be well applied in composite armor to greatly improve the armor protection performance and reduce the weight of the protection system, becoming a broad High-performance lightweight armor materials with development prospects. In addition, advanced structural ceramics are also widely used in traditional industrial fields such as chemical metallurgy, machinery manufacturing, power electronics, energy and environmental protection, and are favored in cutting-edge technology fields such as aerospace, deep space exploration, modern communications, consumer electronics, and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/563C04B35/58C04B35/622C04B35/645
CPCC04B35/563C04B35/58071C04B35/622C04B35/645C04B2235/3821C04B2235/402C04B2235/404C04B2235/5436C04B2235/6581C04B2235/6562C04B2235/6567C04B2235/96
Inventor 吴超刘晓波王兢孙孟勇李华冠张旭
Owner NANJING INST OF TECH
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