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Lanthanum-aluminum phosphate composite material cured at normal pressure and low temperature as well as preparation method and application thereof

A composite material and phosphate technology, which is applied in the field of lanthanum-aluminum phosphate composite materials, can solve problems such as material melting and destruction, and achieve energy saving, low cost, and improved ablation resistance.

Active Publication Date: 2021-08-24
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But when the ablation temperature exceeds 1300°C, the bonded -O-Cu-O- of the material is destroyed, resulting in the melting of the material

Method used

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  • Lanthanum-aluminum phosphate composite material cured at normal pressure and low temperature as well as preparation method and application thereof
  • Lanthanum-aluminum phosphate composite material cured at normal pressure and low temperature as well as preparation method and application thereof
  • Lanthanum-aluminum phosphate composite material cured at normal pressure and low temperature as well as preparation method and application thereof

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preparation example Construction

[0077] The invention provides a preparation method of a lanthanum-aluminum phosphate composite material, comprising the following steps:

[0078] 1) After the preheated dilute phosphoric acid and aluminum hydroxide are reacted, a transparent solution is obtained;

[0079] 2) Mix the transparent solution and chromium trioxide obtained in the above steps, then add hydrogen peroxide, and conduct a heating reaction to obtain aluminum chromium phosphate-based mucus;

[0080] 3) Stir and gel the aluminum-chromium-phosphate-based slime and lanthanum oxide obtained in the above steps, and then place them in a mold to solidify to obtain a lanthanum-aluminum phosphate composite material.

[0081] In the invention, the preheated dilute phosphoric acid and aluminum hydroxide are reacted to obtain a transparent solution.

[0082] In the present invention, the preheating temperature is preferably 80-85°C, more preferably 81-84°C, more preferably 82-83°C.

[0083] In the present invention,...

Embodiment 1

[0122] Add 60-80ml of distilled water to 0.8-1mol of H 3 PO 4 (analytical pure), put the diluted phosphoric acid in a water bath at 80-85°C to heat and stir; then add 0.2-0.4mol of Al(OH) 3 Add to the preheated dilute phosphoric acid and stir until the solution has a certain viscosity. At this time, 0.1-0.2mol of CrO 3 Add the above solution and wait for CrO 3 Dissolve immediately add 0.1-0.2mol of H 2 o 2 . Then the mixture was stirred for 20-30 minutes to prepare the aluminum chromium phosphate-based adhesive. Finally weighed 30 parts of La 2 o 3 Mix it with aluminum chromium phosphate, stir continuously in a water bath at 80-85°C until it reaches a suitable viscosity, pour it into a suitable mold, and put it in a 50°C oven to dry and solidify for 1-2 hours to obtain a 30% La-Al series phosphate high temperature resistant material .

[0123] The lanthanum-aluminum phosphate composite material prepared in Example 1 of the present invention was tested for high temper...

Embodiment 2

[0144] Add 60-80ml of distilled water to 0.8-1mol of H 3 PO 4 (analytical pure), put the diluted phosphoric acid in a water bath at 80-85°C to heat and stir; then add 0.2-0.4mol of Al(OH) 3 Add to the preheated dilute phosphoric acid and stir until the solution has a certain viscosity. At this time, 0.1-0.2mol of CrO 3 Add the above solution and wait for CrO 3 Dissolve immediately add 0.1-0.2mol of H 2 o 2 . Then the mixture was stirred for 20-30 minutes to prepare the aluminum chromium phosphate-based adhesive. Finally weighed 30 parts of La 2 o 3 Mix it with aluminum chromium phosphate, stir continuously in a water bath at 80-85°C until it reaches a suitable viscosity, pour it into a suitable mold, and put it in a 50°C oven to dry and solidify for 1-2 hours to obtain a 40% La-Al series phosphate high temperature resistant material .

[0145] The lanthanum-aluminum phosphate composite material prepared in Example 2 of the present invention was tested for high temper...

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Abstract

The invention provides a lanthanum-aluminum phosphate composite material. The lanthanum-aluminum phosphate composite material comprises lanthanum phosphate and aluminum phosphate compounded with lanthanum phosphate. The composite material has specific phase composition and micro-structure, and lanthanum phosphate and aluminum phosphate are mutually doped and compounded and bonded through ionic bonds, so that the lanthanum-aluminum phosphate composite material which can be quickly cured and molded at low temperature and has excellent performance at high temperature is obtained. The phosphate composite material provided by the invention can be cured and formed at normal pressure and low temperature, so that the product can be formed without special high-temperature sintering by special equipment, complex high-temperature sintering is omitted in the forming process, and energy is saved. The composite material is excellent in high temperature resistance and good in ablation resistance, the surface of an ablated sample is complete at the ablation temperature of 2000 DEG C, melting does not happen, the preparation process is simple, and the preparation period is short.

Description

technical field [0001] The invention belongs to the technical field of lanthanum-aluminum phosphate composite materials, and relates to a lanthanum-aluminum phosphate composite material and its preparation method and application, in particular to a lanthanum-aluminum phosphate composite material capable of curing under normal pressure and low temperature and resistant to 2000°C and Its preparation method and application. Background technique [0002] With the vigorous development of science and technology, many fields (such as aerospace, nuclear engineering and other energy plants) involve extremely high temperature environments. High-temperature heat-resistant materials, as materials used in extreme environments, need to have good high-temperature resistance and other properties, so as to ensure the normal working environment of mechanical components. In order to meet the needs of high-temperature applications, it is of great strategic significance to prepare high-performa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66C04B30/00
CPCC04B30/00C04B35/66
Inventor 孙威张帅帅熊翔张红波湛紫章
Owner CENT SOUTH UNIV
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