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High-toughness silicon carbide ceramic and preparation method thereof

A silicon carbide ceramic and high toughness technology, applied in the field of high toughness silicon carbide ceramic and its preparation, can solve the problems of high brittleness, low fracture toughness, difficulty in meeting high toughness and high strength, etc. Excellent mechanical properties, the effect of improving bulk density and mechanical strength

Active Publication Date: 2014-09-10
NINGBO DONGLIAN MECHANICAL SEAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, silicon carbide ceramics are brittle and have low fracture toughness. The flexural strength of silicon carbide ceramics sintered at normal pressure is generally around 400 MPa, which is difficult to meet the needs of high toughness and high strength silicon carbide ceramics in the fields of sealing and armor industries.

Method used

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  • High-toughness silicon carbide ceramic and preparation method thereof
  • High-toughness silicon carbide ceramic and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] According to the composition and mass percentage of high-toughness silicon carbide in Example 1 in Table 1, weigh silicon carbide with a particle size of 0.3-0.6 μm, titanium carbide with 1-1.5 μm, sintering aid carbon and boron carbide with 1-2 μm and mix well. After mixing evenly, put it into a ball mill, control the ratio of ball to material to 3:1, and add 3% water-soluble resin and 80% distilled water for ball milling for 2 hours. After ball milling, dry the powder in a steam drying oven, then add it to the steel mold and pressurize it to 150MPa / cm 2 Press molding, the pressing time is controlled to 4s. Then put the pressed blank into a vacuum furnace for sintering, the sintering temperature is controlled at 2130° C., and the holding time is 3 hours. Finally, the sintered green body is subjected to surface grinding to obtain a final product of high-toughness silicon carbide ceramics.

Embodiment 2

[0032] According to the composition and mass percentage of high-toughness silicon carbide in Example 2 in Table 1, weigh silicon carbide with a particle size of 0.6-1.0 μm, titanium carbide with a particle size of 1.3-1.6 μm, and sintering aid carbon and carbide with a particle size of 1.5-2.5 μm. Boron and mix well. After mixing evenly, put it into a ball mill, control the ratio of ball to material to 3:1, and add 4% water-soluble resin and 100% distilled water for ball milling for 2 hours. After ball milling, dry the powder in a steam drying oven, then add it to the steel mold and pressurize it to 180MPa / cm 2 Press molding, the pressing time is controlled to 2s. Then put the pressed blank into a vacuum furnace for sintering, the sintering temperature is controlled at 2150° C., and the holding time is 2 hours. Finally, the sintered green body is subjected to surface grinding to obtain a final product of high-toughness silicon carbide ceramics.

Embodiment 3

[0034] According to the composition and mass percentage of high-toughness silicon carbide in Example 3 in Table 1, weigh silicon carbide with a particle size of 0.8-1.3 μm, titanium carbide with a particle size of 1.5-2 μm, sintering aid carbon and boron carbide with a particle size of 2-2.5 μm and mix well. After mixing evenly, put it into a ball mill, control the ratio of ball to material to 3:1, and add 5% water-soluble resin and 120% distilled water for ball milling for 2 hours. After ball milling, dry the powder in a steam drying oven, then add it to the steel mold and pressurize it to 160MPa / cm 2 Press molding, the pressing time is controlled to 3s. Then put the pressed compact into a vacuum furnace for sintering, the sintering temperature is controlled at 2160° C., and the holding time is 2 hours. Finally, the sintered green body is subjected to surface grinding to obtain a final product of high-toughness silicon carbide ceramics.

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Abstract

The invention relates to a high-toughness silicon carbide ceramic and a preparation method thereof. The high-toughness silicon carbide ceramic comprises 3-5% of a toughening agent titanium carbide, 1-4% of a sintering aid, and the balance silicon carbide and inevitable impurities, wherein the sintering aid comprises carbon and boron carbide according to a mass percentage ratio of 1:(0.6-8). The preparation method of the ceramic comprises the following steps: uniformly mixing silicon carbide with the toughening agent titanium carbide and the sintering aid comprising carbon and boron carbide, adding the obtained mixture into a ball mill, adding water-soluble resin and distilled water, carrying out ball milling, drying, adding the dried mixture into a steel mold, carrying out compression molding, sintering the molded mixture in a vacuum furnace, and carrying out surface grinding to prepare the high-toughness silicon carbide ceramic. The addition of the toughening agent titanium carbide into a silicon carbide matrix makes the fracture mode of the silicon carbide ceramic change from intergranular fracture to transgranular fracture, and improves energy required by the transgranular and intergranular fracture in order to enhance the flexural strength.

Description

technical field [0001] The invention relates to a ceramic and a preparation method thereof, in particular to a high-toughness silicon carbide ceramic and a preparation method thereof. Background technique [0002] With the development of science and technology, the requirements for materials in the fields of sealing and armor industry are becoming more and more stringent, and it is urgent to develop a new type of high-performance material. Silicon carbide ceramics have high strength and creep resistance at room temperature, excellent oxidation resistance and corrosion resistance, and silicon carbide ceramics have an extremely low coefficient of friction, excellent wear resistance, and have broad market prospects. . [0003] However, silicon carbide ceramics are brittle and have low fracture toughness. The flexural strength of silicon carbide ceramics sintered at normal pressure is generally around 400MPa, which is difficult to meet the needs of high toughness and high stren...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/565C04B35/63
Inventor 李友宝励永平
Owner NINGBO DONGLIAN MECHANICAL SEAL
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