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Silicon carbide whisker reinforced silicon nitride ceramic composite material and preparation method thereof

A technology of silicon carbide whiskers and silicon nitride ceramics, which is applied in the field of ceramic matrix composite materials and its preparation, can solve the problems of difficult high-temperature use and low brittle-ductile transition temperature, and achieve high fracture toughness, short process cycle, and structural stable effect

Active Publication Date: 2014-04-16
TAICANG PAIOU TECH CONSULTING SERVICE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it creeps at 1200°C and has a low brittle-ductile transition temperature, making it difficult to use alone at high temperatures

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] 1. Mix and granulate silicon carbide whiskers and silicon powder;

[0019] 2. Add sintering aids, monomer crosslinking agents, dispersants, initiators, and catalysts to the above mixed powder, use pure water as the medium, use alumina as the ball milling medium, and add pure water and alumina according to a certain proportion Put it into a nylon tank and ball mill for 24 hours;

[0020] 3. Suction filtration, drying, and heat preservation in an oven at 110°C for 10 hours;

[0021] 4. The dried powder is sieved through a 200-mesh sieve and granulated;

[0022] 5. Take the corresponding weight of powder according to actual needs, place it in a metal or glass sheath, and put it in a sintering furnace to prepare for sintering after vacuuming;

[0023] 6. Sintering by hot isostatic pressing, sintering in a hot isostatic pressing furnace at 1750°C and 5MPa for 1.5 hours, and the cooling rate is about 600°C per hour;

[0024] 7. Ceramics process the appearance of ceramics; ...

Embodiment 2

[0027] 1. Mix and granulate silicon carbide whiskers and silicon powder;

[0028] 2. Add sintering aids, monomer crosslinking agents, dispersants, initiators, and catalysts to the above mixed powder, use pure water as the medium, use alumina as the ball milling medium, and add pure water and alumina according to a certain proportion Put into nylon tank, ball mill for 36 hours;

[0029] 3. Suction filtration, drying, and heat preservation in an oven at 150°C for 5 hours;

[0030] 4. The dried powder is sieved through a 300-mesh sieve and granulated;

[0031] 5. Take the corresponding weight of powder according to actual needs, place it in a metal or glass sheath, and put it in a sintering furnace to prepare for sintering after vacuuming;

[0032] 6. Use hot isostatic pressing sintering, sintering in a hot isostatic pressing furnace at 1700 ° C, 10 MPa for 2 hours, and the cooling rate is about 800 ° C per hour;

[0033] 7. Ceramics process the appearance of ceramics;

[003...

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Abstract

The invention provides a silicon carbide whisker reinforced silicon nitride ceramic composite material and a preparation method thereof. A matrix of the silicon carbide whisker reinforced silicon nitride ceramic composite material is silicon nitride ceramic; a reinforced material is silicon carbide whisker. The preparation method comprises the following steps: mixing the silicon carbide whisker with silicon powder and granulating, and then adding a sintering aid, a monomer crosslinking agent, a dispersing agent and pure water to be mixed to prepare a premix solution; adding an initiator and a catalyst into the premix solution, using aluminium oxide as a ball-milling medium to conduct ball mill for a period of time in a nylon tank, performing filtration and drying, sintering dried powder into a ceramic by adopting hot isostatic pressing, performing shape processing on the ceramic, and conducting nitridation on the ceramic finally. The silicon carbide whisker reinforced silicon nitride ceramic is improved in high-temperature strength, wear resistance, and abrasion resistance, so that silicon nitride ceramic can be more perfectly applied to wider field.

Description

technical field [0001] The invention relates to a ceramic matrix composite material and a preparation method thereof, in particular to a silicon carbide whisker-reinforced silicon nitride ceramic composite material and a preparation method thereof. Background technique [0002] The coefficient of thermal expansion (CTE) of silicon nitride ceramics is 2.5~3.0×10 -6 / K, thermal conductivity 18.4w / m·K, low thermal expansion, high thermal conductivity, so that it has excellent thermal shock resistance. Silicon nitride ceramics have high strength, high hardness, corrosion resistance, oxidation resistance, and good thermal shock and mechanical shock resistance. It was once considered by the material science community to be an excellent comprehensive performance in the field of structural ceramics and the most promising alternative to nickel-based alloys. It is a new type of material widely used in high-tech and high-temperature fields. However, it creeps at 1200°C, and its britt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/80C04B35/81C04B35/622C04B35/584
Inventor 陈照峰余盛杰
Owner TAICANG PAIOU TECH CONSULTING SERVICE
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