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A kind of aluminum borate whisker and its preparation method and application

A technology of aluminum borate whiskers and preparation steps, applied in the field of ceramic materials, can solve problems such as difficult operation, and achieve the effects of high purity, good crystallinity and simple operation

Active Publication Date: 2022-02-25
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

All of the above methods have the disadvantage of being difficult to operate

Method used

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  • A kind of aluminum borate whisker and its preparation method and application
  • A kind of aluminum borate whisker and its preparation method and application
  • A kind of aluminum borate whisker and its preparation method and application

Examples

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Effect test

Embodiment 1

[0033] 1. Using aluminum chloride hydrate and urea as raw materials, set the molar ratio of urea / aluminum chloride to 6:1, weigh 1g (0.0041mol) of aluminum chloride hydrate and 1.49g (0.0249mol) of urea, and mix aluminum chloride (AlCl 3 ·6H 2 O, 99.99%) and urea (CO(NH 2 ) 2 , 99.5%) were respectively dissolved in 20ml of alcohol solvent, after being completely dissolved, the urea solution was added to the aluminum chloride solution while stirring to obtain a clear and transparent stable precursor salt solution, which was continuously stirred at a constant temperature (80°C) until the solution was 10ml to obtain a stable precursor salt solution with an aluminum ion concentration of 0.4142mol / L;

[0034] 2. Coat the concentrated precursor salt solution on the alumina substrate, put it into a boron nitride crucible, and raise the temperature to 1000°C at a rate of 10°C / min under the protection of nitrogen (atmosphere flow rate of 0.4L / min), and keep it warm 5h, aluminum bor...

Embodiment 2

[0036] 1. Using aluminum chloride hydrate and urea as raw materials, set the molar ratio of urea / aluminum chloride to 6:1, weigh 1g (0.0041mol) of aluminum chloride hydrate and 1.49g (0.0249mol) of urea, and mix aluminum chloride (AlCl 3 ·6H 2 O, 99.99%) and urea (CO(NH 2 ) 2 , 99.5%) were respectively dissolved in 20ml of alcohol solvent, after being completely dissolved, the urea solution was added to the aluminum chloride solution while stirring to obtain a clear and transparent stable precursor salt solution, which was continuously stirred at a constant temperature (80°C) until the solution was 10ml to obtain a stable precursor salt solution with an aluminum ion concentration of 0.4142mol / L;

[0037] 2. Coat the concentrated precursor salt solution on the alumina substrate, put it into a boron nitride crucible, and raise the temperature to 1200°C at a rate of 10°C / min under nitrogen protection (atmosphere flow rate of 0.4L / min), and keep it warm 5h, aluminum borate whi...

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Abstract

The invention belongs to the field of ceramic materials and discloses a preparation method and application of aluminum borate whiskers. The method uses aluminum chloride hydrate and urea as raw materials, respectively dissolves aluminum chloride and urea in methanol solvent, heats and dissolves them at a certain temperature, and then adds the urea solution into the aluminum chloride solution to obtain a clear and transparent stable precursor Salt solution, continuously heated and stirred at a constant temperature to obtain a high-concentration precursor salt solution, and the obtained precursor salt solution was coated on Al by spin coating 2 o 3 On the single crystal substrate, put it into a boron nitride crucible, under the protection of nitrogen atmosphere, calcine at 1000°C or 1200°C, keep it warm for 5h, and finally obtain aluminum borate whiskers on the surface of the substrate, the content of its phase is related to the content of urea and heat treatment related to temperature. The method has simple preparation process and low production cost, and the prepared aluminum borate whiskers have high purity and controllable morphology. It can be used as a reinforcing material for plastics, metals and ceramics in aerospace, aviation, building materials, automobiles and other fields.

Description

technical field [0001] The invention belongs to the field of ceramic materials, and in particular relates to an aluminum borate whisker and a preparation method and application thereof. Background technique [0002] Aluminum borate whiskers have stable performance, superior mechanical properties and great applicability. Its heat-resistant temperature is 1200°C, its Mohs hardness is 7, its tensile strength is 7.84GPa, and its tensile modulus of elasticity is 392GPa. It has high elasticity, good mechanical strength, heat resistance, chemical resistance, acid resistance (stable at 70°C in 1mol / L hydrochloric acid), electrical insulation and neutron absorption properties. It can be used as a reinforcing material for plastics, metals and ceramics, used in aerospace, aviation, building materials, automobiles and other fields; when used as a reinforcing material, it has little wear on the mold, and when the content of aluminum borate reaches 30%, the mechanical strength can be enh...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B41/85
CPCC04B41/85C04B41/4596C04B41/009C04B35/10C04B41/4535C04B41/0072
Inventor 程艳玲黎可旭杨盛凯张海南魏世宏林华泰
Owner GUANGDONG UNIV OF TECH
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