Preparation method of self-reinforced silicon carbide ceramic material

A technology of silicon carbide ceramics and carbonization temperature, which is applied in the field of preparation of self-reinforced silicon carbide ceramic materials, can solve the problems of softening, material waste, SiC material use strength and hardness deterioration, etc., to improve bending strength and wide application fields , the effect of inhibiting abnormal growth

Inactive Publication Date: 2021-09-21
NORTHEASTERN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Unfortunately, liquid phase sintering often leads to the formation of low-melting point phases at the grain boundaries of SiC ceramics, and the existence of low-melting point phases will soften SiC ceramics during use in high-temperature environments, and eventually lead to SiC materials at high temperatures. Poor use of strength and hardness
In addition, the optimal content of sintering aids is difficult to control, and adding too much sintering aids will not only cause material waste but also seriously affect the excellent performance of SiC ceramics.

Method used

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  • Preparation method of self-reinforced silicon carbide ceramic material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] The preparation method based on self-reinforced silicon carbide ceramic material comprises the following steps:

[0042] The powder is composed of: α-SiC powder: 95%, B 4 C powder: 1.5%, carbon: 3.5%.

[0043] Among them, α-SiC powder >98.5%, particle size range is 0.3-1.5μm, B 4 C powder > 99%, particle size range 0.3-1.5μm, phenolic resin as carbon source and binder: carbon residue rate 52.5%.

[0044] Specific steps are as follows:

[0045] Step 1, ingredients: weigh α-SiC powder, B 4 C powder and phenolic resin;

[0046] Step 2, mixing: Put the weighed powder and the phenolic resin dissolved in ethanol into the ball mill tank, and mix them evenly by high-speed ball mill for use;

[0047] Select alumina balls as grinding balls, add ethanol for mixing, according to the ball, material and ethanol mass ratio of 2:1:1.5, the rotating speed is 100rpm, and the mixing time is 12 hours;

[0048]Step 3, drying: Dry the uniformly mixed powders in an oven at 85°C, grind t...

Embodiment 2

[0054] The preparation method based on self-reinforced silicon carbide ceramic material comprises the following steps:

[0055] The powder is composed of: α-SiC powder: 94%, β-SiC powder: 1%, B 4 C powder: 1.5%, carbon: 3.5%.

[0056] Among them, α-SiC powder>98.5%, particle size range is 0.3-1.5μm, β-SiC powder>99%, particle size range is 10-100nm, B 4 C powder > 99%, particle size range 0.3-1.5μm, phenolic resin as carbon source and binder: carbon residue rate 52.5%.

[0057] Specific steps are as follows:

[0058] Step 1, ingredients: weigh α-SiC powder, β-SiC powder, B 4 C powder and phenolic resin;

[0059] Step 2, mixing: Put the weighed powder and the phenolic resin dissolved in ethanol into the ball mill tank, and mix them evenly by high-speed ball mill for use;

[0060] Select alumina balls as grinding balls, add ethanol for mixing, according to the ball, material and ethanol mass ratio of 2:1:1.5, the rotating speed is 100rpm, and the mixing time is 12 hours;

...

Embodiment 3

[0067] The preparation method based on self-reinforced silicon carbide ceramic material comprises the following steps:

[0068] The powder is composed by mass percentage: α-SiC powder: 93%, β-SiC powder: 2%, B 4 C powder: 1.5%, carbon: 3.5%.

[0069] Among them, α-SiC powder>98.5%, particle size range is 0.3-1.5μm, β-SiC powder>98%, particle size range is 10-100nm, B 4 C powder > 99%, particle size range 0.3-1.5μm, phenolic resin as carbon source and binder: carbon residue rate 52.5%.

[0070] Specific steps are as follows:

[0071] Step 1, ingredients: weigh α-SiC powder, β-SiC powder, B 4 C powder and phenolic resin;

[0072] Step 2, mixing: Put the weighed powder and the phenolic resin dissolved in ethanol into the ball mill tank, and mix them evenly by high-speed ball mill for use;

[0073] Select alumina balls as grinding balls, add ethanol for mixing, according to the ball, material and ethanol mass ratio of 2:1:1.5, the rotating speed is 100rpm, and the mixing time...

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Abstract

The invention relates to a preparation method of a self-reinforced silicon carbide ceramic material, and belongs to the technical field of ceramic material preparation, and the preparation method comprises the following steps: weighing alpha-SiC powder, beta-SiC powder, B4C powder and carbon according to a mass percentage of (92-94%): (1-3%): (1-3%): (2-4%); performing uniform mixing, drying and sieving the raw materials, and performing compression molding to obtain a biscuit; placing the biscuit in a vacuum tube furnace to be subjected to carbonization treatment, wherein the carbonization temperature ranges from 600 DEG C to 900 DEG C; and carrying out pressureless sintering on the carbonized sample, and performing cooling to obtain the self-reinforced silicon carbide ceramic material. According to the method, beta-SiC powder with different particle sizes is compounded into alpha-SiC powder, so the solid-phase pressureless sintering silicon carbide ceramic material with high density, high strength, high hardness and uniform structure is prepared, and the comprehensive performance of the pressureless sintering silicon carbide ceramic material is improved.

Description

Technical field: [0001] The invention belongs to the technical field of ceramic material preparation, in particular to a preparation method of self-reinforced silicon carbide ceramic material. Background technique: [0002] Silicon carbide (SiC) materials are often used in metallurgy, mechanical electronics, petroleum In the industrial fields such as chemical industry and aerospace, SiC materials have attracted great attention from researchers. However, due to the strong covalent bonds, low grain boundary diffusion and volume diffusion rate of SiC, it is often required to be sintered above 2000 °C to achieve a fully sintered dense state. [0003] At present, researchers often use metal oxides as sintering aids (Al 2 o 3 , Y 2 o 3 、Re 2 o 3 、Er 2 o 3 、Gd 2 o 3 etc.) are added to SiC, and the liquid phase sintering effect promotes the sintering and densification of SiC ceramics at a lower temperature. Unfortunately, liquid phase sintering often leads to the formati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/565C04B35/622C04B35/64
CPCC04B35/565C04B35/622C04B35/64C04B2235/5436C04B2235/5454C04B2235/77C04B2235/96C04B2235/3821C04B2235/422
Inventor 茹红强冯东秦肇伯孙是昊任全兴夏乾王伟张翠萍岳新艳
Owner NORTHEASTERN UNIV
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