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

A technology for toughening chromium aluminum phosphate and mullite whiskers, which is applied in the field of preparation of in-situ toughened chromium aluminum phosphate wave-transparent materials for mullite whiskers, which can solve the problems of expensive whiskers, human health hazards, and poor oxidation resistance And other problems, to achieve high chemical compatibility, low price, low dielectric constant effect

Inactive Publication Date: 2014-03-12
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 resistance, complex process, high cost, expensive whiskers, and will cause harm to human health during processing. Poor sex

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 reacts to prepare the chromium aluminum phosphate precursor, takes 43.8gAl(OH) 3 , 15.7gSiO 2 , 1.08g AlF was mixed with the precursor of chromium aluminum phosphate, ball milled for 24 hours, and the ball milling medium was water. After drying at 100°C, pass through an 80-mesh sieve to granulate, and press at 60MPa. Put the pressed product into a sealed corundum crucible, calcined at 1400°C for 4 hours, and then cool naturally with the furnace temperature, that is, the sintered body of mullite whisker in-situ toughened chromium aluminum phosphate wave-permeable ceramics, fired 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) of ammonia and 3.12g of citric acid, react to prepare the chromium aluminum phosphate precursor, take aluminum sol 47.73g (10% wt), silica sol 8.72 (30% wt), 0.2gAlF and phosphoric acid The chrome-aluminum precursors were mixed and stirred for 24 hours to make a uniform mixture. After drying at 100°C, pass through an 80-mesh sieve to granulate, and press at 60MPa. Put the pressed product into a sealed corundum crucible, calcined at 1400°C for 4 hours, and then cool naturally with the furnace temperature, that is, the sintered body of mullite whisker in-situ toughened chromium aluminum phosphate wave-permeable ceramics, fired 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 reaction preparation chromium aluminum phosphate precursor, take 33.09g TEOS (tetraethyl orthosilicate), 23.62g Al 2 o 3 , 1.64g AlF was mixed with chromium aluminum phosphate precursor, ball milled for 24 hours, and the ball milling medium was water. After drying at 100°C, pass through an 80-mesh sieve to granulate, and press at 60MPa. Put the pressed product into a sealed corundum crucible, calcined at 1300°C for 4 hours, and then cool naturally with the furnace temperature, that is, the sintered body of mullite whisker in-situ toughened chromium aluminum phosphate wave-permeable ceramics, fired 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 the preparation of a toughening material, in particular to a method for preparing a mullite whisker in-situ toughened chromium aluminum phosphate wave-transparent material. The wave-transparent material prepared by the invention is suitable for aircraft radome, antenna window and radar The field of wave-transparent materials such as radomes. Background technique [0002] The development of wave-transparent materials has experienced fiber-reinforced plastics, alumina ceramics, glass-ceramic, silica-based, and nitride-based materials successively. As the flight speed of aircraft continues to increase, more serious aerodynamic and aerodynamic heating problems have been brought about. Therefore, wave-transparent materials must meet the requirements of high temperature resistance, load bearing, and wave transparency. Organic systems such as plastics cannot meet the needs of high-temperature wave-transmitting materials due to their ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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