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Preparation method of B12 (C, Si, B) 3-SiC two-phase ceramic

A ceramic, 3-sic technology, applied in the field of preparation of B123-SiC two-phase ceramics, can solve the problems of organic matter, unfavorable industrial production, complex preparation process, etc., achieve good dimensional stability, avoid high temperature liquid phase silicon penetration Effect

Pending Publication Date: 2022-04-29
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method uses short-term liquid silicon infiltration, the preparation process is complicated, organic matter exists, and the process cycle is long, which is not conducive to industrial production.

Method used

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  • Preparation method of B12 (C, Si, B) 3-SiC two-phase ceramic
  • Preparation method of B12 (C, Si, B) 3-SiC two-phase ceramic
  • Preparation method of B12 (C, Si, B) 3-SiC two-phase ceramic

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Mix 30g of silicon powder with a particle size of 2μm, 40g of boron carbide powder with a particle size of 20μm, and 40g of silicon carbide with a particle size of 1μm to obtain a mixed powder. The mixed powder is dry-pressed in a one-way hydraulic press, and the pressure is 80MPa. The time is 90s, and the porosity of the green body is 65%; set up a chemical furnace, including Ti+C powder with a mass fraction of 80% (Ti, C molar ratio 1:1) and 20% Al+Fe 2 o 3 Powder (Al, Fe 2 o 3 molar ratio 1:1) composition; the green body is combusted and synthesized in a chemical furnace under vacuum conditions to induce the green body to react to obtain B 12 (C,Si,B) 3 -SiC two-phase ceramic ceramics; found by XRD, the synthesis product is a typical B 12 (C, Si, B) 3 -SiC two-phase ceramics, the density of the product is 97.3%, and the fracture toughness is 4.7MPa / m 1 / 2 .

Embodiment 2

[0028] As in Example 1, other reaction conditions are the same, using 25g of silicon powder with a particle size of 1μm, 20g of boron carbide powder with a particle size of 15μm, and 55g of silicon carbide with a particle size of 0.1μm; using a dry pressing molding pressure of 50Mpa to obtain a green body The porosity is 63%; the chemical furnace is set to burn the synthesis reaction under vacuum conditions to obtain B 12 (C,Si,B) 3 -SiC two-phase ceramics, the density of the product is 98.6%, and the fracture toughness is 5.3MPa / m 1 / 2 .

Embodiment 3

[0030] As in Example 1, the other reaction conditions are the same, using 20g of silicon powder with a particle size of 1 μm, 15g of boron carbide powder with a particle size of 15μm, and 65g of silicon carbide with a particle size of 0.5μm; using a dry pressing molding pressure of 60Mpa to obtain a green body The porosity is 50%; the chemical furnace is set to burn the synthesis reaction under vacuum conditions to obtain B 12 (C,Si,B) 3 -SiC two-phase ceramics, the density of the product is 98.9%, and the fracture toughness is 5.8MPa / m 1 / 2 .

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Abstract

The invention discloses a method for preparing B12 (C, Si, B) 3-SiC two-phase ceramic, which can improve the toughness of SiC ceramic with poor toughness. According to the invention, silicon powder, boron carbide powder and silicon carbide powder are used as raw materials, and the B12 (C, Si, B) 3-SiC two-phase ceramic is prepared by a low-cost and short-period chemical furnace combustion synthesis method. Silicon powder, boron carbide powder and silicon carbide powder are mixed and pressed into a green body, then the green body is buried into chemical furnace powder, the chemical furnace powder is ignited, combustion synthesis is carried out, the B12 (C, Si, B) 3-SiC ceramic is obtained, the density of the ceramic can reach 95% or above, and the highest fracture toughness can reach 5.8 MPa / m < 1 / 2 >.

Description

technical field [0001] The present invention relates to the field of SiC-based composite materials, in particular to B 12 (C,Si,B) 3 - Preparation of SiC two-phase ceramics. Background technique [0002] Silicon carbide (SiC) ceramics are advanced engineering materials with excellent physical and mechanical properties, and have the characteristics of high hardness, high strength, low density, and good chemical stability. However, their natural low fracture toughness and poor sinterability (sintering temperature >2000°C) limit their applications, and high-pressure equipment such as SPS and hot pressing must usually be used. The liquid silicon infiltration (LSI) process is a fast and straightforward method to fabricate large-sized dense SiC ceramics with complex shapes at high temperature of 1600 °C. In addition, doped boron carbide particles strengthened silicon carbide ceramics, and a ternary boron carbide-based compound B was found on its surface 12 (B, C, Si) 3 , t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/565C04B35/65
CPCC04B35/565C04B35/65C04B2235/428C04B2235/3821C04B2235/77C04B2235/96
Inventor 杨增朝王良贺刚杨潇李永双爽李江涛
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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