Lithium aluminum magnesium titanium phosphate LAMTP single-phase ceramic wave-absorbing material, preparation method and application thereof

A technology of titanium magnesium aluminum lithium phosphate and single-phase ceramics, which is applied in the direction of magnetic field/electric field shielding and electrical components, and can solve the problems of deepening absorption peak, low reflectivity, and needs to be expanded.

Active Publication Date: 2020-10-30
XIAN AERONAUTICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, Li prepared by solid-phase method 1.3 Al 0.3 Ti 1.7 (PO 4 ) 3 The conductivity of single-phase ceramics is at 1×10 -4 S cm -3 ~4×10 -4 S cm -3 , its conductivity needs to be improved; Li 1.3 Al 0.3 Ti 1.7 (PO 4 ) 3 The real part of the dielectric constant of single-phase ceramics is 10.2-13.1, and the imaginary part is 2.2-3.3; in the X-band, the absorption bandwidth with a reflectivity lower than -10dB is 2.25GHz, and the absorption bandwidth needs to be expanded, and the minimum reflectivity is - 13.4dB, the absorption peak needs to be deepened

Method used

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  • Lithium aluminum magnesium titanium phosphate LAMTP single-phase ceramic wave-absorbing material, preparation method and application thereof
  • Lithium aluminum magnesium titanium phosphate LAMTP single-phase ceramic wave-absorbing material, preparation method and application thereof
  • Lithium aluminum magnesium titanium phosphate LAMTP single-phase ceramic wave-absorbing material, preparation method and application thereof

Examples

Experimental program
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Embodiment 1

[0044] A kind of Li 1.31 Al 0.29 Mg 0.01 Ti 1.7 (PO 4 ) 3 The preparation method of single-phase ceramic wave-absorbing material comprises the following steps:

[0045] (1), prepare raw materials: weigh Li respectively according to the ratio of the amount of substances to 0.7205:3:1.7:0.145:0.01 2 CO 3 , NH 4 h 2 PO 4 、TiO 2 、Al 2 o 3 , MgO; wherein, the purity of each raw material is greater than 99.99%;

[0046] (2), one-time ball milling: mix the raw materials prepared in (1) and pour them into a polytetrafluoroethylene ball milling tank and add zirconia grinding balls, the mass ratio of the balls to materials is 20:1, and add absolute ethanol to submerge the grinding balls and Mix the raw materials to 2 / 3 of the ball mill tank, and then perform a ball mill treatment at a speed of 250rad / min for 8h to obtain a precursor slurry;

[0047] (3), one-time drying: after the first ball milling, pour the precursor slurry in the ball mill tank into a clean stainless st...

Embodiment 2

[0054] A kind of Li 1.4 Al 0.2 Mg 0.1 Ti 1.7 (PO 4 ) 3 The preparation method of single-phase ceramic wave-absorbing material comprises the following steps:

[0055] In addition to (1), weigh Li according to the ratio of the amount of substances to 0.77:3:1.7:0.1:0.1 2 CO 3 , NH 4 h 2 PO 4 、TiO 2 、Al 2 o 3 , MgO;

[0056] (3) heat up to 920°C at a heating rate of 5°C / min, and keep warm for 8h;

[0057] In (7), under the pressure condition of 40 MPa, the temperature was raised to 1020° C. at a heating rate of 120° C. / min, and kept for 8 minutes.

[0058] All the other steps are the same as in Example 1.

[0059] The Li that embodiment 2 makes 1.4 Al 0.2 Mg0.1 Ti 1.7 (PO 4 ) 3 The conductivity of the single-phase ceramic absorbing material is 4×10 - 3 S cm -3 .

Embodiment 3

[0061] A kind of Li 1.34 Al 0.26 Mg 0.04 Ti 1.7 (PO 4 ) 3 The preparation method of single-phase ceramic wave-absorbing material comprises the following steps:

[0062] In addition to (1), the ratio of the amount of substances is 0.737: 3: 1.7: 0.13: 0.04, respectively weigh Li 2 CO 3 , NH 4 h 2 PO 4 、TiO 2 、Al 2 o 3 , MgO;

[0063] (3) heat up to 900°C at a heating rate of 5°C / min, and keep warm for 6 hours;

[0064] In (7), under the pressure condition of 30 MPa, the temperature was raised to 1000° C. at a heating rate of 100° C. / min and kept for 5 minutes.

[0065] All the other steps are the same as in Example 1.

[0066] The Li that embodiment 3 makes 1.34 Al 0.26 Mg 0.04 Ti 1.7 (PO 4 ) 3 The conductivity of the single-phase ceramic absorbing material is 5×10 - 3 S cm -3 .

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Abstract

The invention discloses a lithium aluminum magnesium titanium phosphate LAMTP single-phase ceramic wave-absorbing material, a preparation method and application thereof. The preparation method comprises the following steps of: taking Li2CO3, NH4H2PO4, TiO2, Al2O3 and MgO as raw materials in a mass ratio of 1.1(0.65+0.5x):3:1.7:0.15-0.5x:x, wherein x is 0.01-0.1; mixing the raw materials, then performing presintering at a temperature of 880DEG C-920DEG C, and then conducting plasma discharge sintering at a temperature of 980DEG C-1020DEG C. According to the invention, a composite material is not required to be adopted, and the lithium aluminum magnesium titanium phosphate LAMTP single-phase ceramic wave-absorbing material with remarkable wave-absorbing performance is directly prepared, so that the problems of oxidation and interface reaction of the composite material during long-term use are avoided.

Description

technical field [0001] The invention belongs to the technical field of preparation of wave-absorbing materials, and relates to a LAMTP single-phase ceramic wave-absorbing material and its preparation method and application. Background technique [0002] With the further development of military science and technology, modern information warfare puts forward the demand for the stealth performance of weapons under high temperature. Common high-temperature microwave-absorbing materials usually adopt the method of compounding the absorber and the matrix. The matrix generally uses ceramics or glass that can withstand high temperatures, and the absorber is generally a carbon-based material with high electrical conductivity, such as SiC, ZnO and Ti. 3 SiC 2 Etc., by adjusting the type, content, size, shape and distribution state of the absorbent to realize the control of electromagnetic parameters. However, there are problems of oxidation and interfacial reaction when this kind of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/447C04B35/64C04B35/622H05K9/00
CPCC04B35/447C04B35/64C04B35/62222H05K9/0088C04B2235/96C04B2235/442C04B2235/3232C04B2235/3217C04B2235/3206C04B2235/6562C04B2235/6567C04B2235/666
Inventor 陈丹周影影唐健江
Owner XIAN AERONAUTICAL UNIV
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