Unlock instant, AI-driven research and patent intelligence for your innovation.

Silicon nitride-based composite ceramic material and preparation method thereof by microwave sintering

A composite ceramic, silicon nitride-based technology, applied in the field of silicon nitride-based composite ceramic materials and their microwave sintering preparation

Active Publication Date: 2021-05-04
NANJING UNIV OF SCI & TECH
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In summary, the existing microwave sintering process of silicon nitride ceramics needs to be improved, and the mechanical properties of the prepared silicon nitride ceramics still need to be improved.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Silicon nitride-based composite ceramic material and preparation method thereof by microwave sintering
  • Silicon nitride-based composite ceramic material and preparation method thereof by microwave sintering

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A silicon nitride-based composite ceramic material and a microwave sintering method thereof, specifically: by mass percentage α-Si 3 N 4 75%, Y 2 o 3 3%, MgO 5%, Al 2 o 3 2%, (W, Ti) C 15% are carried out batching, and the mixed powder of preparation is medium with absolute ethanol, and silicon nitride ball is mill ball, puts into corundum ball mill tank and ball mills for 48 hours, and ball-to-material ratio is 7: 1. Add polyvinyl alcohol aqueous solution with a concentration of 3wt% 2 hours before the end of ball milling; dry and grind after ball milling, and pass through a 100-mesh sieve, and dry-press the sieved powder at a pressure of 150 MPa. 3 minutes; put the compact into the silicon carbide wafer auxiliary heating device and place it in the microwave sintering furnace, evacuate the furnace cavity into a vacuum state, and then pour in 0.11MPa nitrogen gas; turn on the microwave power supply for heating, at a rate of 20°C / min Heating rate Heat the sample to...

Embodiment 2

[0026] A silicon nitride-based composite ceramic material and a microwave sintering method thereof, specifically: by mass percentage α-Si 3 N 4 68%, Y 2 o 3 5%, MgO 3%, Al 2 o 3 4%, (W, Ti) C 20% are carried out batching, and the mixed powder of preparation is medium with absolute ethanol, and silicon nitride ball is grinding ball, puts into corundum ball mill tank and ball mills for 48 hours, and ball-to-material ratio is 7: 1. Add polyvinyl alcohol aqueous solution with a concentration of 5wt% 2 hours before the end of ball milling; dry and grind after ball milling, and pass through a 100-mesh sieve, and dry-press the sieved powder at a pressure of 200 MPa. 3 minutes; put the compact into the silicon carbide wafer auxiliary heating device and place it in the microwave sintering furnace, evacuate the furnace cavity into a vacuum state, and then inject 0.11MPa nitrogen gas; turn on the microwave power supply for heating, at a rate of 25°C / min Heating rate Heat the sample...

Embodiment 3

[0028] A silicon nitride-based composite ceramic material and a microwave sintering method thereof, specifically: by mass percentage α-Si 3 N 4 72%, Y 2 o 3 5%, MgO 5%, Al 2 o 32%, (W,Ti)C 15%, Ni1% for batching, the prepared mixed powder was mixed with absolute ethanol as the medium, silicon nitride balls were used as grinding balls, and put into a corundum ball mill jar for ball milling for 48 hours, the ball-to-material ratio 7:1, and add a polyvinyl alcohol aqueous solution with a concentration of 5wt% 2 hours before the end of ball milling; dry and grind after ball milling, and pass through a 100-mesh sieve, and dry press the sieved powder at a pressure of 150MPa , hold the pressure for 3 minutes; put the compact into the silicon carbide wafer auxiliary heating device and place it in the microwave sintering furnace, pump the furnace cavity into a vacuum state, and then pour in 0.12MPa nitrogen gas; turn on the microwave power supply for heating, at 30°C Heat the sam...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
hardnessaaaaaaaaaa
hardnessaaaaaaaaaa
hardnessaaaaaaaaaa
Login to View More

Abstract

The invention discloses a silicon nitride-based composite ceramic material and a microwave sintering preparation method thereof. The silicon nitride-based composite ceramic material of the present invention, in weight percentage, comprises the following components: α-Si 3 N 4 68%~75%, Y 2 o 3 3%~5%, MgO 3%~5%, Al 2 o 3 2%~4%, (W,Ti)C 15%~20%, Ni 1%~4%. The silicon nitride-based composite ceramic material of the present invention uses a microwave medium as a heat source, and is prepared under the protection of a nitrogen atmosphere at a relatively fast heating rate by optimizing process parameters such as component distribution ratio, sintering temperature, and holding time, and adopting microwave sintering technology. . The ceramic material prepared by the present invention not only has high hardness, but also has good toughness. The sample with the highest comprehensive performance has a hardness of 17.27±0.26GPa and a toughness of 7.35±0.57MPa.m 1 / 2 .

Description

technical field [0001] The invention belongs to the technical field of microwave sintering materials, and relates to a silicon nitride-based composite ceramic material and a microwave sintering preparation method thereof. Background technique [0002] Silicon nitride ceramic is a kind of ceramic material with good wear resistance, strong thermal shock resistance and excellent mechanical properties, especially its excellent high temperature characteristics, even at 1300 ℃, it still has high strength, and can be used in aerospace Used parts, bearings, high-speed cutting tools and other fields. At present, silicon nitride ceramics are mostly prepared by traditional sintering methods, such as reaction sintering, pressureless sintering, gas pressure sintering, hot pressing sintering, hot isostatic pressing sintering, etc. However, there are many disadvantages in traditional sintering, such as high equipment and maintenance costs; the use of heat radiation and heat conduction hea...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/584C04B35/622C04B35/626C04B35/64
CPCC04B35/584C04B35/622C04B35/62605C04B35/64C04B2235/3206C04B2235/3217C04B2235/3225C04B2235/3843C04B2235/3847C04B2235/405C04B2235/6562C04B2235/6567C04B2235/96
Inventor 殷增斌徐伟伟陈明丹袁军堂汪振华
Owner NANJING UNIV OF SCI & TECH