High-performance silicon carbide ceramic material and preparation method thereof

A high-performance technology of silicon carbide ceramics, applied in the field of high-performance silicon carbide ceramic materials and its preparation, can solve the problems of low strength and toughness, low density, and low toughness of silicon carbide ceramics

Pending Publication Date: 2021-05-11
东莞市康柏工业陶瓷有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, silicon carbide ceramics prepared by pressureless sintering still have problems such as low toughness, low density, and further improvement in strength and hardness.
At present, in order to prepare dense silicon carbide ceramics with excellent performance, patent document 1 (CN104446493A) adopts two-step pressureless solid-phase sintering to prepare silicon carbide ceramics, but the preparation process is complicated and the strength and toughness are not high.

Method used

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  • High-performance silicon carbide ceramic material and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment 1, a kind of preparation method of high-performance silicon carbide ceramic material is characterized in that, comprises the steps:

[0029] (1) Prepare raw materials: in terms of mass percentage, in the raw materials, the content of silicon carbide powder is 75%, the content of sintering aid is 20%, and the content of binder is 5%; in the silicon carbide powder, Silicon carbide powder is composed of α-silicon carbide powder and β-silicon carbide powder. Based on the total amount of silicon carbide powder, the mass percentage of α-silicon carbide powder is 60%, and the rest is β-silicon carbide powder; The average particle size is 20nm, and the average particle size of β-silicon carbide powder is 230nm; the sintering aid is composed of B 4 Composition of C, C and AlN; B 4 The mass ratio of C, C and AlN is 1:2:3; the binder is phenolic resin;

[0030] (2) Ball milling and mixing: Carry out ball milling and mixing of silicon carbide powder, sintering aid and ...

Embodiment 2

[0034] Embodiment 2, a kind of preparation method of high-performance silicon carbide ceramic material is characterized in that, comprises the steps:

[0035] (1) Prepare raw materials: in terms of mass percentage, in the raw materials, the content of silicon carbide powder is 90%, the content of sintering aid is 5%, and the content of binder is 5%; in the silicon carbide powder, Silicon carbide powder is composed of α-silicon carbide powder and β-silicon carbide powder. Based on the total amount of silicon carbide powder, the mass percentage of α-silicon carbide powder is 70%, and the rest is β-silicon carbide powder; The average particle size is 200nm, and the average particle size of β-silicon carbide powder is 30nm; the sintering aid is composed of B 4 Composition of C, C and AlN; B 4 The mass ratio of C, C and AlN is 1:2:1; the binder is phenolic resin;

[0036] (2) Ball milling and mixing: Carry out ball milling and mixing of silicon carbide powder, sintering aid and b...

Embodiment 3

[0040] Embodiment 3, a kind of preparation method of high-performance silicon carbide ceramic material is characterized in that, comprises the steps:

[0041] (1) Prepare raw materials: in terms of mass percentage, in the raw materials, the content of silicon carbide powder is 75%, the content of sintering aid is 20%, and the content of binder is 5%; in the silicon carbide powder, Silicon carbide powder is composed of α-silicon carbide powder and β-silicon carbide powder. Based on the total amount of silicon carbide powder, the mass percentage of α-silicon carbide powder is 66%, and the rest is β-silicon carbide powder; The average particle size is 20nm, and the average particle size of β-silicon carbide powder is 230nm; the sintering aid is composed of B 4 Composition of C, C and AlN; B 4 The mass ratio of C, C and AlN is 1:2:3; the binder is phenolic resin;

[0042] (2) Ball milling and mixing: Carry out ball milling and mixing of silicon carbide powder, sintering aid and ...

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Abstract

The invention relates to a high-performance silicon carbide ceramic material and a preparation method thereof. The preparation method comprises the following steps of raw material preparation, ball-milling mixing, spray granulation, compression molding and sintering. Through the adding proportion of alpha-silicon carbide powder and beta-silicon carbide powder in the raw materials, grain boundary strengthening and grain refinement are facilitated, and further, the obdurability and the hardness of the silicon carbide ceramic are improved. The sintering temperature range can be expanded by proper sintering aid composition, and convenience is brought to process control; the sintering aid is B4C, C and AlN, and when the mass ratio of B4C to C to AlN is (1-2): (1.5-3): (1-3), the sintering aid can better improve the interface bonding strength between silicon carbide grains and promote the improvement of high-temperature strength. When the sintering temperature is 2050 DEG C, the sintering density of the silicon carbide ceramic material is high. The prepared silicon carbide ceramic material has excellent room-temperature and high-temperature mechanical properties.

Description

technical field [0001] The invention relates to a silicon carbide ceramic material, in particular to a high-performance silicon carbide ceramic material and a preparation method thereof. Background technique [0002] With the development of science and technology, people have higher requirements for the research of new materials. In terms of engineering materials, not only are materials required to have good mechanical properties, but also excellent physical and chemical properties, such as density, corrosion resistance, high temperature resistance, heat transfer, etc. Structural ceramic materials can meet many performance requirements. [0003] Silicon carbide ceramics is an important member of structural ceramics. It has excellent high-temperature strength, high hardness, high temperature resistance, and corrosion resistance. It can be used in many aspects such as bearings, rotors, vehicles, and shipbuilding. The preparation methods of silicon carbide ceramics mainly inc...

Claims

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Application Information

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IPC IPC(8): C04B35/565C04B35/64
CPCC04B35/565C04B35/64C04B2235/3821C04B2235/422C04B2235/3865C04B2235/658C04B2235/6562C04B2235/6567C04B2235/96C04B2235/77Y02P20/10
Inventor 不公告发明人
Owner 东莞市康柏工业陶瓷有限公司
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