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Preparation method of lanthanum phosphate, lanthanum phosphate porous ceramic as well as preparation method and application thereof

A technology of porous ceramics and lanthanum phosphate, applied in the field of wave-transparent materials, can solve the problems of low porosity of lanthanum phosphate porous ceramics, complex preparation of lanthanum phosphate powder, low dielectric constant, etc., to achieve optimal proportion content, good dispersion, Effect of reducing milling time

Active Publication Date: 2018-08-14
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The object of the present invention is to provide a kind of lanthanum phosphate (LaPO4) with high porosity, low thermal conductivity, low dielectric constant 4 ) Porous ceramics, to overcome the shortcomings of complex preparation of lanthanum phosphate powder and low porosity of lanthanum phosphate porous ceramics

Method used

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  • Preparation method of lanthanum phosphate, lanthanum phosphate porous ceramic as well as preparation method and application thereof
  • Preparation method of lanthanum phosphate, lanthanum phosphate porous ceramic as well as preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0038] Stir and mix 200g of lanthanum carbonate and 200g of water evenly, then pour 80g of concentrated phosphoric acid (the mass fraction of phosphoric acid in the concentrated phosphoric acid is 80%) and keep stirring until the reaction is complete, then put it in an oven at 150-200°C for 18-24 hours. The block obtained after drying was mixed with 140g of alcohol, and after planetary ball milling for 1-1.5h, then dried at 50°C, and heated to 900°C at 3°C / min and kept for 2h to obtain lanthanum phosphate powder.

[0039] Mix 1.0g PVP, 0.5g sodium hexametaphosphate, 1.1g TEMED and 50g deionized water evenly to form a premixed solution, then add 100g of the lanthanum phosphate powder prepared in this embodiment, and after planetary ball milling for 1 hour, a low-viscosity Ceramic slurry premix. Then add 11g N-MAM, 1.1g MBAM, 0.25g sodium dodecyl sulfate (SDS) (foaming agent) and 0.04g dodecyl alcohol (foam stabilizer) in the ceramic slurry premixed liquid and mechanically stir,...

Embodiment 2

[0043] Stir and mix 200g of lanthanum carbonate and 200g of water evenly, then pour 100g of concentrated phosphoric acid (the mass fraction of phosphoric acid in the concentrated phosphoric acid is 80%) and keep stirring until the reaction is complete, then put it in an oven and dry at 150°C for 24h. The block obtained after drying was mixed with 140g of alcohol, and after planetary ball milling for 1-1.5h, then dried at 50°C, and heated to 900°C at 3°C / min and kept for 2h to obtain lanthanum phosphate powder.

[0044] 1.0g PVP, 0.5g sodium hexametaphosphate, 1.1g TEMED, and 45g deionized water were mixed uniformly to form a premix, then 100g of the lanthanum phosphate powder prepared in this embodiment was added to the premix, and the powder was milled by planetary ball for 1.5 After h, a stable ceramic slurry premix was obtained. Then add 11g N-MAM, 1.1g MBAM, 0.25g sodium dodecyl sulfate (SDS) (foaming agent) and 0.04g dodecyl alcohol (foam stabilizer) in the ceramic slurry...

Embodiment 3

[0047] Stir and mix 200g of lanthanum carbonate and 200g of water evenly, then pour 80g of concentrated phosphoric acid (the mass fraction of phosphoric acid in the concentrated phosphoric acid is 80%) and keep stirring until the reaction is complete, then put it in an oven and dry at 150°C for 24h. The block obtained after drying was mixed with 140g of alcohol, and after planetary ball milling for 1-1.5h, then dried at 50°C, and heated to 900°C at 3°C / min and kept for 2h to obtain lanthanum phosphate powder.

[0048] Mix 1.0g PVP, 0.5g sodium hexametaphosphate, 1.1g TEMED, and 50g deionized water evenly to form a premixed liquid, then add 100g of lanthanum phosphate powder prepared in this example and 2g of titanium dioxide, and after planetary ball milling for 1h , to obtain a low-viscosity ceramic slurry premix. Then add 11g N-MAM, 1.1g MBAM, 0.25g sodium dodecyl sulfate (SDS) (foaming agent) and 0.04g dodecyl alcohol (foam stabilizer) in the ceramic slurry premixed liquid ...

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Abstract

The invention discloses a preparation method of lanthanum phosphate powder. The preparation method of the lanthanum phosphate powder comprises the steps of uniformly mixing lanthanum carbonate and strong phosphoric acid in water, stirring until reacting completely, drying, wet milling, and grinding after drying; preserving heat for a ground product at 900 DEG C to 1200 DEG C for 0.5 to 5h, and obtaining lanthanum phosphate powder. The invention also discloses a method for preparing a lanthanum phosphate porous ceramic through gel casting a foaming slurry suspensoid containing the lanthanum phosphate powder, drying, degreasing and sintering, and application of the prepared lanthanum phosphate porous ceramic used as a wave-transmitting material. The lanthanum phosphate powder prepared by themethod provided by the invention is high in purity, good in dispersibility and uniform in particle size distribution; the prepared lanthanum phosphate porous ceramic has the porosity being larger than or equal to 70 percent, the average pore size being 50 to 120mu m, the dielectric constant of 10GHz being 2 to 4, and the loss tangent being 1.5 to 3.5*10<-3>, and has favorable wave transmission performance and heat insulating property.

Description

technical field [0001] The invention belongs to the field of wave-transmitting materials, and in particular relates to a preparation method of lanthanum phosphate, a lanthanum phosphate porous ceramic, a preparation method and application thereof. Background technique [0002] With the continuous development of aerospace and communication technology, wave-transparent materials have attracted more and more attention. The wave-transparent material is a multi-functional dielectric material widely used in advanced scientific equipment such as launch vehicles, spaceships, missiles and returnable satellites. The harsh use environment proposes heat-proof and heat-insulating, wave-transparent, weather-resistant, and Bearer and other requirements. Therefore, there is great interest in materials with high-temperature thermal stability, low thermal conductivity, non-reactivity with molten metals, impermeability to reactive gases, and excellent electromagnetic wave transmission propert...

Claims

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Application Information

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IPC IPC(8): C04B35/447C04B35/626C04B35/634C04B35/622C04B38/10
CPCC04B35/447C04B35/622C04B35/626C04B35/6261C04B35/62625C04B35/63444C04B38/10C04B2235/3227C04B2235/6023C04B2235/6562C04B2235/6567C04B2235/77C04B2235/96C04B38/0074C04B38/0067
Inventor 刘玉付汪坤乔健
Owner SOUTHEAST UNIV
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