Method for preparing alumina-based nano eutectic composite micro powder by high-temperature melt aerosol method

A technology of high-temperature melt and aerosol method, which is applied in the field of high-temperature melting combined with gas atomization and quenching, which can solve the problems of low efficiency and complicated process, and achieve the effect of reducing cost, uniform particle size distribution, and suitable for large-scale industrial production

Active Publication Date: 2018-09-11
HARBIN JEHOT ADVANCED MATERIALS CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0017] The purpose of the present invention is in order to solve existing preparation Al 2 o 3 / ZrO 2 The process of nano-eutectic powder is complicated and the efficiency is low, and a new low-cost, high-efficiency preparation method of alumina-based nano-eutectic composite micropowder is provided.

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  • Method for preparing alumina-based nano eutectic composite micro powder by high-temperature melt aerosol method
  • Method for preparing alumina-based nano eutectic composite micro powder by high-temperature melt aerosol method
  • Method for preparing alumina-based nano eutectic composite micro powder by high-temperature melt aerosol method

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specific Embodiment approach 1

[0033] Specific embodiment one: the method for preparing alumina-based nano-eutectic micron powder by high-temperature melt aerosol method in this embodiment is implemented according to the following steps:

[0034] 1. Dry Al 2 o 3 and diluent powder, respectively, to obtain dry Al 2 o 3 and diluent powder;

[0035] Second, the dried Al 2 o 3 Mix the powder and diluent powder evenly to get a homogeneous Al 2 o 3 base powder;

[0036] 3. Mix the homogeneous Al 2 o 3 The base powder is put into the crucible, the bottom of the crucible communicates with the flow-limiting guide tube, the nozzle of the current-limiting guide tube communicates with the atomization system, the crucible is located in the high-temperature heating equipment, and the evenly heated Al 2 o 3 The base powder is melted and kept in the molten state for 10-60 minutes to obtain Al 2 o 3 base melt;

[0037] 4. Pass in inert gas to make the pressure in the crucible reach 0.2-5MPa, Al 2 o 3 The bas...

specific Embodiment approach 2

[0043] Specific embodiment two: the difference between this embodiment and specific embodiment one is that the described diluent is ZrO 2 , Y 2 o 3 , MgO, ZnO, CeO 2 , Tb 2 o 3 、Dy 2 o 3 、Ho 2 o 3 、Er 2 o 3 、Tm 2 o 3 , Yb 2 o 3 、Gd 2 o 3 、Sm 2 o 3 One or more mixed diluents.

[0044] In this embodiment, when the diluent is a mixture, the components can be mixed in any ratio.

specific Embodiment approach 3

[0045] Specific embodiment three: the difference between this embodiment and specific embodiment two is that when the product contains zirconia, Y 2 o 3 0-20mol% of the molar content of zirconia in the product, CeO 2 0-30mol% of the molar content of zirconia in the product, MgO is 0-28mol% of the molar content of zirconia in the product, CaO is 0-33.45mol% of the molar content of zirconia in the product, TiO 2 0~44.41mol% of the molar content of zirconia in the product, Sc 2 o 3 It is 0-20 mol% of the molar content of zirconia in the product.

[0046] This embodiment combines powder mixing, high-temperature heating and melting technology and rapid cooling technology to propose a new preparation method of alumina-based nano-eutectic ceramic powder. Consider Al 2 o 3 / ZrO 2 The melting point temperature of the composite powder and the heating temperature range should be 2000-2500°C. In the preparation process, tungsten or graphite crucible is used as the container for Al...

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Abstract

The invention relates to a method for preparing alumina-based nano eutectic composite micro powder by a high-temperature melt aerosol method, and relates to a preparation method of alumina-based nanoeutectic composite ceramic powder, which aims to solve the problems of complex process and low efficiency of the preparation of the nano eutectic powder in the prior art. The preparation method comprises the following steps of: heating Al2O3 and diluent composite powder to be melted, preserving heat for a period of time, gas-atomizing the system by using a gas atomization method, crushing the meltinto superfine liquid drops by using high-pressure inert gas by. Under the action of surface tension, the superfine liquid drops deposit in the atomization tower and form spherical superfine power material. The spherical nano eutectic powder material with high purity is prepared through the separation and collection of the spherical superfine power material by using a filter. The process is simple, and the alumina-based nano eutectic powder is prepared by directly adopting a high-temperature melting method combined with a gas mist quenching method, wherein the nano eutectic crystal grains have small crystal grain spacing, excellent powder performance, are micron-grade spherical particles, has good forming property and does not need granulation, so that the process cost is low.

Description

technical field [0001] The invention relates to a preparation method of alumina-based nanoeutectic composite ceramic powder, in particular to an Al 2 o 3 A method of high-temperature melting combined with gas atomization and quenching of matrix composite ceramic powder. Background technique [0002] Oxide ceramics have excellent oxidation resistance and corrosion resistance, and can work for a long time in a high-temperature oxidizing atmosphere. Polycrystalline oxide ceramics prepared by traditional methods have defects such as amorphous phase, pores and inclusions at the grain boundaries, and the grain boundaries are easy to diffuse and slip under high temperature environments, resulting in rapid deterioration of their mechanical properties such as strength and creep resistance. At a temperature of 1000-1200°C, it is not suitable as a high-temperature structural material. [0003] Studies have shown that Al 2 o 3 / ZrO 2 Eutectic ceramics have the characteristics of h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/119C04B35/117C04B35/488C04B35/626
CPCC04B35/117C04B35/119C04B35/4885C04B35/62665C04B2235/3206C04B2235/3224C04B2235/3225C04B2235/3229C04B2235/3284C04B2235/96
Inventor 郑永挺林逢雨郁万军栢跃磊赫晓东
Owner HARBIN JEHOT ADVANCED MATERIALS CO LTD
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