a kind of mosi 2 / al 2 o 3 High temperature resistant microwave absorbing material, preparation method and application thereof

A microwave-absorbing material and high-temperature-resistant technology, which is applied in the field of chemical material preparation, can solve problems such as high ductile-brittle transition temperature, high proportion of non-metallic bonds, and insufficient creep strength, and achieve good high-temperature resistance and oxidation resistance

Active Publication Date: 2020-08-04
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, MoSi 2 Due to the high proportion of non-metallic bonds in the crystal structure and low structural symmetry, the prominent disadvantage is that the ductile-brittle transition temperature is too high, it is very brittle at room temperature, and the fracture toughness is only 2.5MPa m 1 / 2 Left and right, the high temperature (>1250°C) strength, especially the creep strength is obviously insufficient. At present, no high-quality wave-absorbing material capable of high-efficiency high-temperature resistance and oxidation resistance has been seen in China. The present invention provides such an excellent wave-absorbing material

Method used

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  • a kind of mosi <sub>2</sub> / al <sub>2</sub> o <sub>3</sub> High temperature resistant microwave absorbing material, preparation method and application thereof
  • a kind of mosi <sub>2</sub> / al <sub>2</sub> o <sub>3</sub> High temperature resistant microwave absorbing material, preparation method and application thereof
  • a kind of mosi <sub>2</sub> / al <sub>2</sub> o <sub>3</sub> High temperature resistant microwave absorbing material, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Select MoSi 2 , Al 2 o 3 , Al powder and SiO 2 As raw material, dextrin as binder, B 2 o 3 As a sintering aid, MoSi with a content of 6wt.% is selected in terms of mass percentage 2 , 35wt.% SiO 2 , 26wt.% Al powder, 15wt.% Al 2 o 3 , 8wt.% dextrin and 10wt.% B 2 o 3 , adding absolute ethanol and mechanically grinding for 8.5 hours with a full-range fine powder ball mill, the ball milling speed is 350rpm, to obtain a mixed slurry;

[0027] Place the mixed slurry in a constant temperature electric drying oven at 80°C to dry for 48 hours until it becomes a mixed powder;

[0028] Grind the mixed powder obtained by drying the slurry for 4 hours with an agate mortar, then add an appropriate amount of deionized water and stir evenly for 4 hours;

[0029] Use a hydraulic pressure testing machine to make a size of 250MPa on the press For the cylindrical sample, put the cylindrical sample in a constant temperature electric drying oven at 80°C for 48 hours;

[003...

Embodiment 2

[0033] Select MoSi 2 , Al 2 o 3 , Al powder and SiO 2 As raw material, dextrin as binder, B 2 o 3 As a sintering aid, MoSi with a content of 16wt.% is selected in terms of mass percentage 2 , 25wt.% SiO 2 , 21wt.% Al powder, 20wt.% Al 2 o 3 , 9wt.% dextrin and 9wt.% B 2 o 3 , adding absolute ethanol and mechanically grinding for 10 hours with a full-range fine powder ball mill, the ball milling speed is 350rpm, to obtain a mixed slurry;

[0034] Place the mixed slurry in a constant temperature electric drying oven at 80°C to dry for 48 hours until it becomes a mixed powder;

[0035] Grind the mixed powder obtained by drying the slurry for 4 hours with an agate mortar, then add an appropriate amount of deionized water and stir evenly for 4 hours;

[0036] Use a hydraulic pressure testing machine to make a size of 250MPa on the press For the cylindrical sample, put the cylindrical sample in a constant temperature electric drying oven at 80°C for 48 hours;

[0037...

Embodiment 3

[0040] Select MoSi 2 , Al 2 o 3 , Al powder and SiO 2 As raw material, dextrin as binder, B 2 o 3 As a sintering aid, MoSi with a content of 24wt.% is selected in terms of mass percentage 2 , 15wt.% SiO 2 , 17wt.% Al powder, 25wt.% Al 2 o 3 , 9wt.% dextrin and 10wt.% B 2 o 3 , adding absolute ethanol and mechanically grinding with a full-range fine powder ball mill for 8 hours, the ball milling speed is 350rpm, to obtain a mixed slurry;

[0041] Place the mixed slurry in a constant temperature electric drying oven at 80°C to dry for 48 hours until it becomes a mixed powder;

[0042] Grind the mixed powder obtained by drying the slurry for 4 hours with an agate mortar, then add an appropriate amount of deionized water and stir evenly for 4 hours;

[0043] Use a hydraulic pressure testing machine to make a size of 250MPa on the press For the cylindrical sample, put the cylindrical sample in a constant temperature electric drying oven at 80°C for 48 hours;

[0044...

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Abstract

The invention relates to a novel anti-oxidation and high-temperature resistant wave-absorbing material and a preparation process thereof. Concretely involving a MoSi 2 / Al 2 o 3 High temperature resistant microwave absorbing material, preparation method and application thereof. Follow these steps: the MoSi 2 , Al 2 o 3 , Al powder and SiO 2 As raw material, dextrin as binder, B 2 o 3 As a sintering aid, after batching and mixing, add a small amount of deionized water to trap the material; use a hydraulic pressure testing machine to make a disc-shaped sample with a size of Heating to 1300~1450℃ in medium temperature. The boron doped MoSi 2 / Al 2 o 3 The apparent porosity of the anti-oxidation and high-temperature resistant wave-absorbing material is 20.81% to 35.43%, and the bulk density is 2.89 to 4.11g cm ‑3 . Experiments show that the present invention provides boron-doped MoSi 2 / Al 2 o 3 The absorbing material has good oxidation resistance and high temperature resistance, and has a good application prospect in the field of absorbing materials.

Description

technical field [0001] The present invention relates to a kind of preparation method of chemical material, particularly a kind of MoSi 2 / Al 2 o 3 High temperature resistant microwave absorbing material, preparation method and application thereof. Background technique [0002] In modern warfare, discovering and attacking the enemy first is an important guarantee for defeating the enemy. It can be seen that the invisibility of weapons and equipment can significantly improve military efficiency, and is one of the important directions for the development of high-tech military in the world. [0003] An ideal absorbing material should have the characteristics of strong absorption, wide frequency band, and light weight. Traditional magnetic absorbing materials have a large specific gravity and may lose their magnetism at high temperatures. Their application in some fields is limited. Therefore, suitable metal or metal alloy micropowders are used to prepare broadband absorbing,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/10C04B35/622C04B38/00C09D1/00C09D7/65
CPCC04B35/10C04B35/622C04B38/00C04B2235/3409C04B2235/3418C04B2235/3891C04B2235/402C04B2235/77C04B2235/96C09D1/00C09D5/18C09D7/65C04B38/0067C04B38/0074
Inventor 武志红张聪李妤婕
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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