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A preparation method of ultra-high temperature porous ceramic framework with controllable morphology

A porous ceramic and ultra-high temperature technology, which is applied in the field of preparation of ultra-high temperature porous ceramic skeleton with controllable morphology, can solve the problems of difficult control of pores, low mechanical strength, and unsatisfactory precision of porous materials, so as to reduce wettability, Improves mechanical strength and facilitates the effect of catalyst enrichment

Active Publication Date: 2022-04-19
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The reaction corrosion and high temperature oxidation used in the sacrificial template method will cause different degrees of damage to the skeleton; the freezing casting method is complex in process and the solvent in the powder cannot volatilize, resulting in pores and internal stress, etc., resulting in low overall mechanical strength; The direct foaming method cannot control the foaming rate, which makes it difficult to control the pores; the porous material prepared by the gel injection molding method cannot meet the precision due to the large amount of volatilization of the solvent.

Method used

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  • A preparation method of ultra-high temperature porous ceramic framework with controllable morphology
  • A preparation method of ultra-high temperature porous ceramic framework with controllable morphology
  • A preparation method of ultra-high temperature porous ceramic framework with controllable morphology

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Experimental program
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Effect test

Embodiment 1

[0033] First, the particle size of the ceramic oxide powder is 50nm at the nanometer level, and the carbon powder needs to be sieved with different mesh screens to finally control the particle size of the carbon powder at 48 μm; secondly, the molar ratio of the oxide powder to the carbon (boron) powder is weighed as 0.5︰1.6, pour the weighed two powders and alcohol into a beaker and mix them, and mix them with a magnetic stirrer for 20 minutes until they are fully uniform, and then heat them on a resistance wire heating furnace until the alcohol evaporates completely, then grind them in an agate mortar And use different mesh sieves to finally control the particle size of the mixed powder at 75 μm; then, use graphite paper to spread the inner wall of the hot-pressing mold, and then spread the mixed material evenly in the mold; The hot-pressing mold is placed in a hot-pressing sintering furnace, and a compressive stress of 10,000N is applied in the vertical direction of the mold....

Embodiment 2

[0035] First of all, the particle size of ceramic oxide powder and carbon (boron) powder is 100nm at the nanometer level and 50μm at the micron level. . Secondly, weigh the molar ratio of oxide powder and carbon (boron) powder to be 1.2:3.7, pour the two powders weighed and alcohol into a beaker and mix them, and mix them with a magnetic stirrer for 60 minutes until they are fully uniform. Heat it on a resistance wire heating furnace until the alcohol evaporates completely, grind it in an agate mortar and sieve it with different mesh screens, and finally control the particle size of the mixed powder at 50 μm; then, spread the inner wall of the hot-pressing mold with graphite paper, and then Spread the mixture evenly in the mold; after that, place the hot-press mold with the powder in a hot-press sintering furnace, apply a compressive stress of 2 000 N in the vertical direction of the mold, sinter at 2100°C, and hold for 4 hours. The heating rate is 20°C / min, the argon gas is ...

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Abstract

The invention relates to a method for preparing a super-high-temperature porous ceramic skeleton with controllable morphology, which uses ceramic oxide, carbon (boron) powder, boron carbide powder, and high-melting point metals such as tungsten as raw materials, and controls the reaction temperature or composition The content of medium carbon (boron) / high melting point metal, supplemented by mold pressure and inert atmosphere protection, is sintered at a high temperature to prepare a porous ceramic skeleton material with controllable morphology. The preparation method of the invention is simple, low in cost, high in efficiency, pollution-free and safe and stable. The porous skeleton ceramic has the characteristics of high specific strength, high specific modulus, good thermal shock resistance, corrosion resistance, high sound absorption coefficient and low thermal conductivity. It can be widely used in the fields of catalyst carrier, high temperature filter, humidity and gas sensor, biological bone material, metal melt removal, automobile exhaust gas adsorption, high temperature heat insulation gasket in aerospace, high temperature noise reduction of engine, etc. It has good economic and social benefits.

Description

technical field [0001] The invention belongs to the application of ultra-high melting point porous ceramic framework prepared by particle accumulation method and high-temperature molding sintering technology in the technical field of composite materials, sound-absorbing materials and high-temperature wave-absorbing materials, and relates to an ultra-high temperature porous ceramic framework with controllable morphology. Preparation. Background technique [0002] Porous ceramic framework materials are widely used as catalyst carriers, high temperature filters, Humidity and gas sensors, heat insulation materials, biological bone materials, sound-absorbing materials and high-temperature wave-absorbing materials, etc. The surface morphology of the porous ceramic framework has a crucial influence on the attachment of catalyst supports, the wettability of high-temperature metals, and sound absorption and noise reduction. It has been reported that the influence of different morph...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/01C04B35/52C04B35/515C04B38/00C04B35/645
Inventor 付前刚闫宁宁张育育史小红李贺军
Owner NORTHWESTERN POLYTECHNICAL UNIV
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