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Process for producing carbon chopped fiber reinforced BaAl2Si2O8 composite material

A baal2si2o8, composite material technology, applied in the field of BAS composite material preparation technology, can solve the problems of composite material creep, slow change of SiC polycrystalline fiber microstructure, etc., to improve the bending strength and fracture toughness, avoid no signs Brittle fracture and the effect of suppressing the generation of microcracks

Inactive Publication Date: 2011-09-21
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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  • Process for producing carbon chopped fiber reinforced BaAl2Si2O8 composite material
  • Process for producing carbon chopped fiber reinforced BaAl2Si2O8 composite material
  • Process for producing carbon chopped fiber reinforced BaAl2Si2O8 composite material

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specific Embodiment approach 1

[0010] 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

[0011] 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

[0012] 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 evenly 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 invention provides a method for preparing a carbon chopped fiber reinforced BaAl2Si2O8 composite material, and relates to a process for preparing a BAS composite material so as to solve the problem that a matrix of a high-temperature ceramic composite material generates micro cracks and improve bending strength and fracture toughness of the composite material. The composite material comprises a carbon chopped fiber reinforced body and BAS, wherein the volume percent of the carbon chopped fiber reinforced body is between 1 and 50 percent, and the method for preparing the composite material is as follows: a. chopping carbon fibers to between 1 and 3 millimeters, carrying out ultrasonic dispersion to the chopped fibers for 20 to 40 minutes, fishing out fiber plates after the carbon fibers are agglomerated into plates, chopping the fiber plates for the second time according to the length of between 1 and 3 millimeters, and filtering out slag; b. weighting BAS powder raw material, filling the BAS powder raw material in a plastic bottle, and adding absolute ethyl alcohol or isopropanol into the raw material for wet mixing and pulping; c. adding the chopped carbon fibers into the slurry to carry out ultrasonic vibration, and then putting the mixture into an oven to be dried into a fiber ball covered by powder; and d. putting the fiber ball into a mould for hot pressed sintering. The method has the advantages of improving the mechanical performance of the composite material at room temperature and high temperature, and the thermal shock resistance performance and the ablation resistance performance of the composite material.

Description

[0001] The patent application for this invention is made by the application number 200610010505.1, the application date is September 06, 2006, and the invention name is "carbon short fiber reinforced BaAl 2 Si 2 o 8 A divisional application for the invention patent of composite material and its preparation method. technical field [0002] The invention relates to a preparation process of BAS composite material, in particular to a hot-pressing sintering process of carbon short fiber reinforced BAS glass-ceramic matrix composite material. Background technique [0003] 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 ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C03C10/00
Inventor 叶枫刘利盟
Owner HARBIN INST OF TECH