Heat wave-transmission porous ceramic material and preparation method thereof

A technology of porous ceramics and heat penetration, applied in the field of functional ceramics, which can solve the problems of poor mechanical properties, easy deliquescence, and unsuitable storage.

Active Publication Date: 2015-01-07
SINOMA SYNTHETIC CRYSTALS CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, boron nitride ceramics have high thermal conductivity, poor mechanical properties, and are easy to deliquesce in the air, so they are not suitable for storage. Therefore, a single boron nitride material is not suitable for heat insulation and dielectric materials.

Method used

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  • Heat wave-transmission porous ceramic material and preparation method thereof
  • Heat wave-transmission porous ceramic material and preparation method thereof
  • Heat wave-transmission porous ceramic material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Silicon nitride, lanthanum nitrate and boron nitride are prepared into ceramic raw material powder according to the weight ratio of 90:5:5. Use absolute ethanol as a dispersant and silicon nitride balls as grinding balls for the ceramic raw material powder. After 4 hours of high-speed circulation and stirring, spray granulation treatment to obtain a granular powder with an average particle size of 30 μm, which is loaded into a mold for The body was obtained by cold isostatic pressing, and the molding pressure was 80 MPa. Carry out pre-sintering under the air atmosphere with the formed green body, the sintering temperature is 600 ℃, keep warm for 60 minutes, then pass through the pressureless sintering under the nitrogen atmosphere, the sintering temperature is 1650 ℃, keep warm for 1 hour, obtain the thermal Wave-transparent porous ceramic materials.

[0050] The samples have been tested, and the technical indicators are shown in Table 1:

[0051] Table 1 Performance ...

Embodiment 2

[0054] Silicon nitride, cerium nitrate and boron nitride are formulated into ceramic raw material powder according to the weight ratio of 82:8:10. Use absolute ethanol as a dispersant and silicon nitride balls as grinding balls for the ceramic raw material powder. After stirring at a high speed for 5 hours, spray granulation treatment to obtain a granular powder with an average particle size of 25 μm, and put it into a mold for The body was obtained by cold isostatic pressing, and the molding pressure was 70 MPa. Carry out pre-sintering under the air atmosphere with the formed green body, the sintering temperature is 550 ℃, keep warm for 40 minutes, then pass through the pressureless sintering under the nitrogen atmosphere, the sintering temperature is 1700 ℃, keep warm for 1.5 hours, obtain the thermal Wave-transparent porous ceramic materials.

[0055] The samples have been tested, and the technical indicators are shown in Table 2:

[0056] Table 2 Performance test situati...

Embodiment 3

[0059] Silicon nitride, lanthanum nitrate, cerium nitrate and boron nitride are formulated into ceramic raw material powder according to the weight ratio of 78:6:6:10. Use absolute ethanol as a dispersant and silicon nitride balls as grinding balls for the ceramic raw material powder. After stirring at a high speed for 6 hours, spray granulation treatment to obtain a granular powder with an average particle size of 30 μm, and put it into a mold for The body was obtained by cold isostatic pressing, and the molding pressure was 90 MPa. Carry out pre-sintering under the air atmosphere with the molded green body, the sintering temperature is 600 ℃, keep warm for 60min, then pass through the pressureless sintering under the nitrogen atmosphere, the sintering temperature is 1750 ℃, keep warm for 1.5 hours, obtain the thermal Wave-transparent porous ceramic materials.

[0060] The samples have been tested, and the technical indicators are shown in Table 3:

[0061] Table 3 Performa...

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Abstract

The invention provides a heat wave-transmission porous ceramic material and a preparation method thereof. The heat wave-transmission porous ceramic material is prepared by the following steps of (1) mixing silicon nitride, boron nitride and a sintering additive with a dispersant and grinding balls to prepare a slurry; (2) granulating the slurry obtained by the step (1) and processing by isostatic cool pressing to obtain a blank body; (3) sintering the blank body obtained by the step (2) to obtain a green body; and (4) sintering the green body obtained by the step (3). The preparation method provided by the invention is scientific and reasonable, simple and practicable. The heat wave-transmission porous ceramic material with high performance is obtained from silicon nitride and boron nitride, by using lanthanum nitrate, cerium nitrate and samarium nitrate as sintering aids, without addition of a pore-forming agent.

Description

technical field [0001] The invention belongs to the technical field of functional ceramics, and relates to a heat-transparent porous ceramic material and a preparation method thereof. Background technique [0002] Wave-transparent materials refer to a class of functional materials that can pass through electromagnetic waves of a certain frequency. With the needs of modern warfare and the rapid development of missile technology, the flight Mach number of aircraft is constantly increasing, and the application of wave-transparent materials is becoming more and more extensive. It is also getting stricter. Stable high-frequency dielectric properties, good thermal properties, mechanical properties and environmental resistance are the research focus and development direction of new high-performance wave-transmitting materials. However, there are not many types of wave-transparent materials with good comprehensive performance and suitable for high Mach number aircraft. After decad...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/584C04B35/622C04B38/06
Inventor 丁艳张伟儒韦中华徐鹏王坤郭坚
Owner SINOMA SYNTHETIC CRYSTALS CO LTD
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