Preparation method of mullite whisker in-situ toughened chromium phosphate aluminum wave-transmitting material

A kind of technology of toughness chromium aluminum phosphate and mullite whiskers

Inactive Publication Date: 2013-05-01
SOUTHWEAT UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among the many whiskers, non-oxide whiskers (such as: silicon carbide, silicon nitride) have poor oxidation resistan

Method used

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  • Preparation method of mullite whisker in-situ toughened chromium phosphate aluminum wave-transmitting material
  • Preparation method of mullite whisker in-situ toughened chromium phosphate aluminum wave-transmitting material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Take 10gAl(OH) 3 , 4.27gCrO 3 , 44.34gH 3 PO 4 (85% wt), 1.37g methanol is reacted to prepare chromium aluminum phosphate precursor, and 43.8g Al(OH) is taken 3 , 15.7gSiO 2 , 1.08g AlF is mixed with chromium aluminum phosphate precursor, ball milled for 24 hours, and the ball milling medium is water. After drying at 100°C, it is granulated through an 80-mesh sieve, and then compressed at 60MPa. Put the pressed product into a sealed corundum crucible, calcined at 1400°C for 4 hours, and cool down naturally with the furnace temperature, which is the in-situ toughened chromium aluminum phosphate wave-transmitting ceramic fired body of mullite whisker. Bulk density 2.59g / cm 3 , Dielectric constant 3-4, bending strength 150-200MPa.

Embodiment 2

[0029] Take Al(NO 3 ) 3 ·9H 2 O 8.02g, Cr(NO 3 ) 3 ·9H 2 O 2.85g, (NH 4 ) 2 HPO 4 8.47g, 7.28g (15% wt) ammonia water and 3.12g citric acid were reacted to prepare chromium aluminum phosphate precursor. Aluminosol 47.73g (10% wt), silica sol 8.72 (30% wt), 0.2g AlF and phosphoric acid The chromium-aluminum precursor is mixed and stirred for 24 hours for uniform mixing. After drying at 100°C, it is granulated through an 80-mesh sieve, and then compressed at 60MPa. Put the pressed product into a sealed corundum crucible, calcined at 1400°C for 4 hours, and cool down naturally with the furnace temperature, which is the in-situ toughened chromium aluminum phosphate wave-transmitting ceramic fired body of mullite whisker. Bulk density 2.51g / cm 3 , Dielectric constant 3-4, bending strength 1500-200MPa.

Embodiment 3

[0031] Take 10gAl(OH) 3 , 4.27gCrO 3 , 44.34gH 3 PO 4 (85% wt), 1.37g methanol is reacted to prepare chromium aluminum phosphate precursor, 33.09g TEOS (ethyl orthosilicate), 23.62g Al 2 O 3 , 1.64g AlF and chromium aluminum phosphate precursor are mixed, ball milled for 24 hours, the ball milling medium is water. After drying at 100°C, it is granulated through an 80-mesh sieve, and then compressed at 60MPa. Put the pressed product into a sealed corundum crucible, calcined at 1300°C for 4 hours, and cool down naturally with the furnace temperature, which is the in-situ toughened chromium aluminum phosphate wave-transmitting ceramic fired body of mullite whisker. Bulk density 2.63g / cm 3 , Dielectric constant 3-4, bending strength 150-200MPa.

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Abstract

The invention discloses a preparation method of a mullite whisker in-situ toughened chromium phosphate aluminum wave-transmitting material. The method is characterized by the following steps of: dissolving a phosphorus-containing compound into absolute ethyl alcohol or water, adding an aluminum-containing compound and a chromium-containing compound at the temperature of 50-100 DEG C while stirring for reacting, and adding ammonia water, citric acid or methanol for reacting to obtain a chromium phosphate aluminum precursor; putting the chromium phosphate aluminum precursor, the aluminum-containing compound, a silicon-containing compound, aluminum fluoride and water or alcohol into a ball milling device for performing ball milling to obtain a mixture; and drying the mixture, grinding, sieving, performing press forming on the minus sieve, i.e., sintering precursor powder, and calcining in an enclosed container at the temperature of 1,200-1,500 DEG C for 1-24 hours to obtain the mullite whisker in-situ toughened chromium phosphate aluminum wave-transmitting material. The method has the advantages of in-situ growth of mullite whiskers, uniform distribution of the whiskers, dense substrate sintering, good toughening effect, high performance of the wave-transmitting material, applicability of the wave-transmitting material to antenna covers of flying vehicles, radar antenna covers and the like.

Description

Technical field [0001] The invention relates to a preparation of toughened materials, in particular to a preparation method of in-situ toughened chromium aluminum phosphate wave-transmitting materials with mullite whiskers. The wave-transmitting materials prepared by the invention are suitable for aircraft radomes, antenna windows and radars Radome and other wave-transmitting materials. Background technique [0002] The development of wave-transmitting materials to this day has experienced fiber reinforced plastics, alumina ceramics, glass-ceramics, silica-based, and nitride-based. As the flight speed of aircraft continues to increase, more serious problems of aerodynamic force and aerodynamic heating have been brought about. Therefore, the wave-transmitting material must meet the requirements of high temperature resistance, load bearing, and wave transmission. Organic systems such as plastics cannot meet the needs of high-temperature wave-transmitting materials due to their lim...

Claims

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Application Information

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IPC IPC(8): C04B35/81C04B35/447C04B35/622
Inventor 陈宁霍冀川高祀建雷永林
Owner SOUTHWEAT UNIV OF SCI & TECH
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