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Short carbon fiber reinforced composite BaAl2Si2O8 material

A baal2si2o8, carbon short fiber technology, used in the field of carbon short fiber reinforced BAS glass-ceramic matrix composites, can solve the problems of composite creep, slow change of SiC polycrystalline fiber microstructure, etc., and achieve bending strength and fracture toughness. Improve, avoid no sign of brittle fracture, inhibit the effect of micro-cracks

Inactive Publication Date: 2008-06-25
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the high temperature region above 1200 °C, the microstructure of SiC polycrystalline fibers changes slowly, which will lead to the creep of composite materials.

Method used

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  • Short carbon fiber reinforced composite BaAl2Si2O8 material
  • Short carbon fiber reinforced composite BaAl2Si2O8 material
  • Short carbon fiber reinforced composite BaAl2Si2O8 material

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Experimental program
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specific Embodiment approach 1

[0009] Specific embodiment 1: The short carbon fiber reinforced BAS (or BSAS) composite material of this embodiment is composed of short carbon fibers and BAS, which is collectively abbreviated as C sf / BAS composite material, its structural characteristics are: the volume percentage of short carbon fiber reinforcement in the composite material is 1% to 50%, and the optimal value is 10% to 30%. The carbon fibers are uniformly or relatively uniformly distributed in the BAS matrix.

specific Embodiment approach 2

[0010] Specific embodiment two: The silicon nitride particle-carbon short fiber hybrid reinforced BAS (or BSAS) composite material of this embodiment is composed of short carbon fibers, silicon nitride particles and BAS, and is uniformly abbreviated as (C sf +Si 3 N 4p ) / BAS composite material, its structural characteristics are: the volume percentage of short carbon fiber reinforcement in the composite material is 1% to 50%, and the optimum value is 10% to 30%. Si 3 N 4 The volume percentage of particles is 1%-50%, and the optimum value is 10%-30%. Carbon fiber and Si 3 N 4 The particles are uniformly or relatively uniformly distributed in the BAS matrix. Si 3 N 4 Some or all of the particles transform into long rod-shaped β-Si 3 N 4 . BAS matrix is ​​hexagonal phase or monoclinic phase according to the application requirements.

specific Embodiment approach 3

[0011] Specific embodiment three: The nano-zirconia particles-carbon short fiber hybrid reinforced BAS (or BSAS) composite material of this embodiment is composed of carbon short fibers, nano-zirconia particles and BAS, and is uniformly abbreviated as (C sf +ZrO 2p ) / BAS composite material, its structural characteristics are: the volume percentage of short carbon fiber reinforcement in the composite material is 1% to 50%, and the optimum value is 10% to 30%. The volume percentage of nano zirconia particles is 1%-50%, and the optimum value is 10%-30%. Carbon fibers and nano-zirconia particles are uniformly or relatively uniformly distributed in the BAS matrix. BAS matrix is ​​hexagonal phase or monoclinic phase according to the application requirements.

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Abstract

The present invention is short carbon fiber reinforced BaAl2Si2O8 (BAS) composite material and its preparation process. The composite material with raised bending strength and fracture toughness includes BAS and short carbon fiber as reinforcing component in 1-50 vol%. The preparation process includes the following steps: 1. cutting short carbon fiber into 1-3 mm length, ultrasonic treatment to form fiber sheet, re-cutting to 1-3 mm length, and filtering off broken slag; 2. mixing BAS powder with anhydrous ethanol or isopropanol in a plastic bottle to form slurry; 3. adding short carbon fiber into the slurry via ultrasonic vibrating and drying in an oven to fiber ball with coated powder material; and 4. hot pressing fiber ball in mold and sintering. The composite material has raised room temperature and high temperature mechanical performance, improved heat shock resistance and high ablation resistance.

Description

technical field [0001] The invention relates to a BAS composite material, in particular to a short carbon fiber reinforced BAS glass ceramic matrix composite material. Background technique [0002] Glass-ceramics has the characteristics of high melting point, low thermal expansion coefficient, good oxidation resistance, and is easy to form. It is the preferred matrix of high-temperature ceramic composite materials for heat protection of hypersonic missiles with Ma≥5 and high-temperature ceramic composite materials for hot-end parts of missile engines [US7982535- N; US5256610-A]. BAS with barium feldspar as the main crystal phase (molecular formula BaAl 2 Si 2 o 8 ) glass ceramics (BaO·Al 2 o 3 2SiO2 2 ) has a melting point as high as 1760°C, and the use temperature of composite materials based on it is expected to reach 1500°C. Harbin Institute of Technology and Northwestern Polytechnical University have been conducting research on BAS glass ceramics and their composi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C03C10/06
Inventor 叶枫刘利盟
Owner HARBIN INST OF TECH