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Suspension slurry and method for reactive bonding of silicon carbide ceramics

A technology of silicon carbide ceramics and suspension, which is applied in the field of ceramic connection, can solve the problems of unsatisfactory connection layer performance and uneven distribution of residual silicon, and achieve the effect of improving joint reliability, small stress concentration, and good separation effect

Active Publication Date: 2021-10-01
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the connection technology of silicon carbide ceramics, the ceramic connection layer is mainly constructed by reaction connection technology. The components of the connection layer include added silicon carbide particles, newly formed silicon carbide, residual silicon, etc., due to the use of infiltration technology , so the distribution of residual silicon is not very uniform, and the performance of the connection layer (joint) is not very ideal

Method used

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  • Suspension slurry and method for reactive bonding of silicon carbide ceramics
  • Suspension slurry and method for reactive bonding of silicon carbide ceramics
  • Suspension slurry and method for reactive bonding of silicon carbide ceramics

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Experimental program
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Effect test

Embodiment 1

[0047] (1) Each component of the suspension slurry system is selected, wherein: the solvent is a mixed solvent of ethyl acetate and xylene. The dispersant is castor oil. The organic precursor is polycarbosilane (PCS) with a molecular weight of about 1500. The average particle size of silicon carbide powder is 50 μm. The average particle size of carbon black powder is 50nm. The catalyst is Fe(C 5 h 5 ) 2 , the particle size is between 100 and 500nm;

[0048] (2) The solid content (C+SiC) of the suspension slurry is 30 wt%, and C / SiC=0.2. The mass percentage of polycarbosilane (PCS) relative to the solvent is 30wt%. In the solvent, ethyl acetate:xylene=2:3. The dispersant is castor oil, and its mass percentage with the sum of silicon carbide ceramic powder and carbon black powder is 4wt%. The catalyst is Fe(C 5 h 5 ) 2 , its mass percentage with the organic precursor is 10wt%;

[0049] (3) Prepare the suspension slurry according to the above-mentioned design ratio, ...

Embodiment 2

[0056] (1) Select each component of the suspension slurry system, wherein: the solvent is a mixed solvent of ethyl acetate and xylene; the dispersant is castor oil; the organic precursor is polycarbosilane (PCS) with a molecular weight of about 1500; The average particle size of silicon powder is 10μm; the average particle size of carbon black powder is 10nm; the catalyst is Fe(C 5 h 5 ) 2 , the particle size is between 100 and 500nm;

[0057] (2) The solid content (C+SiC) of the suspension slurry is 50 wt%, and C / SiC=0.5. The mass percentage of polycarbosilane (PCS) relative to the solvent is 45 wt%. In the solvent, ethyl acetate:xylene=2:3. The dispersant is castor oil, and its mass percentage with the sum of silicon carbide ceramic powder and carbon black powder is 3wt%. The catalyst is Fe(C 5 h 5 ) 2 , the mass percent with the organic precursor is 40wt%;

[0058] (3) Prepare the suspension slurry according to the above-mentioned design ratio, dissolve polycarbosi...

Embodiment 3

[0065] (1) Select each component of the suspension slurry system, wherein: the solvent is a mixed solvent of ethyl acetate and xylene; the dispersant is castor oil; the organic precursor is polycarbosilane (PCS) with a molecular weight of about 1500; The average particle size of silicon powder is 50μm; the average particle size of carbon black powder is 10nm; the catalyst is Fe(C 5 h 5 ) 2 , the particle size is between 100 and 500nm;

[0066] (2) The solid content (C+SiC) of the suspension slurry is 40 wt%, and C / SiC=0.4. The mass percentage of polycarbosilane (PCS) relative to the solvent is 40wt%. In the solvent, ethyl acetate:xylene=2:3. The dispersant is castor oil, and its mass percentage with the sum of silicon carbide ceramic powder and carbon black powder is 6wt%. The catalyst is Fe(C 5 h5 ) 2 , its mass percentage with the organic precursor is 20wt%;

[0067] (3) configure the suspension slurry according to the above-mentioned design ratio, dissolve polycarbo...

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Abstract

The invention relates to a suspension slurry and a method for the reaction connection of silicon carbide ceramics. The composition of the suspension slurry includes: a solvent, an organic precursor, a catalyst, a silicon carbide powder and a carbon black powder; the organic precursor is Polycarbosilane, the catalyst is ferrocene Fe(C 5 H 5 ) 2 ; the total content of silicon carbide powder and carbon black powder in the suspension slurry is 30-50 wt %; the mass percentage of the organic precursor in the organic precursor solution is 30-45 wt %; the catalyst is an organic 10 to 40 wt% of the mass of the precursor.

Description

technical field [0001] The invention relates to a suspension slurry and a method for reactive connection of silicon carbide ceramics, in particular to a method for preparing a one-dimensional nanowire in-situ self-generated reinforced silicon carbide ceramic connection layer (joint), belonging to the field of ceramic connection. Background technique [0002] Silicon carbide ceramics have a series of advantages such as low density, small thermal expansion coefficient, high thermal conductivity, excellent mechanical properties at room temperature and high temperature, acid and alkali corrosion resistance and wear resistance, etc., and are widely used in aerospace, nuclear energy, automobile and other fields. With the wide application of silicon carbide ceramics, some special application environments have put forward requirements on the size and shape of ceramic materials. However, limited by ceramic molding methods and preparation equipment, silicon carbide ceramic parts with ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B37/00C04B35/80C04B35/565C04B35/626C04B35/64
CPCC04B35/565C04B35/62625C04B35/64C04B37/005C04B37/008C04B2235/424C04B2235/483C04B2235/5244C04B2235/656C04B2235/6567C04B2237/083C04B2237/365C04B2237/584
Inventor 刘岩唐茂刘学建黄政仁
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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