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Method for improving wettability of Al2O3 porous perform and NbAl molten alloy

A prefabricated and wettable technology, applied in the field of improving wettability in the process of pressureless infiltration of NbAl/Al2O3 composite materials, can solve the problems of inability to achieve effective pressureless infiltration, poor wettability, etc., to extend the range of use, improve Wetting properties, the effect of reducing production costs

Inactive Publication Date: 2016-01-27
陈焕铭 +5
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for porous layered Al 2 o 3 In the process of pressureless infiltration of NbAl alloy melt in ceramic preform, due to the NbAl alloy melt and Al 2 o 3 Poor wetting between ceramic preforms prevents effective pressureless infiltration and successful preparation of NbAl / Al 2 o 3 composite material

Method used

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  • Method for improving wettability of Al2O3 porous perform and NbAl molten alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] (a) After the NbAl intermetallic compound is crushed into fine particles, the model is ball milled for 24 hours by QM-3SP2 ball mill to obtain a fine powder with a particle size of about 100 microns;

[0012] (b) NbAl powder and Ti powder are batched and mixed uniformly according to the atomic percentages of Nb, Al and Ti being 45%, 20%, and 35% respectively by a mixer;

[0013] (c) Using a tablet press of model 769YP-24B to compress the above-mentioned mixed powder into a disc shape;

[0014] (d) Place the disc-shaped pressed part on the bottom or top of the alumina preform, and put it into an electromagnetic induction furnace for pressureless infiltration. The infiltration temperature is 1830°C and the vacuum degree is 2×10 -3 Pa;

[0015] Scanning electron microscope morphology observation and energy spectrum analysis show that the alloy melt completely fills the whole skeleton of the alumina preform, realizing pressureless infiltration.

Embodiment 2

[0017] (a) After the NbAl intermetallic compound is broken into fine particles, the model is QM-3SP2 ball mill ball milled for 24 hours to obtain a fine powder with a particle size of about 100 microns;

[0018] (b) NbAl powder and Ti powder are batched and mixed uniformly according to the atomic percentages of Nb, Al and Ti being 55%, 35%, and 10%, respectively, using a mixer;

[0019] (c) Using a tablet press of model 769YP-24B to compress the above-mentioned mixed powder into a disc shape;

[0020] (d) Place the disc-shaped pressed part on the bottom or top of the alumina preform, and put it into an electromagnetic induction furnace for pressureless infiltration. The infiltration temperature is 1860 °C and the vacuum degree is 2×10 -3 Pa;

[0021] Scanning electron microscope morphology observation and energy spectrum analysis show that the alloy melt completely fills the whole skeleton of the alumina preform, realizing pressureless infiltration.

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Abstract

The invention provides a method for improving the wettability of an Al2O3 porous perform and NbAl molten alloy. A near-net-size product which is compact and provided with a continuous micro structure can be obtained with low cost by repairing NbAl / Al2O3 composite materials of a network interconnection structure, and therefore the respective advantages of ceramics and intermetallic compounds are brought into full play, and metal-based ceramic composite materials with high oxidation resistance, good mechanical performance and long service life are obtained. In the process that the NbAl molten alloy infiltrates into the Al2O3 porous ceramic perform, non-pressure infiltration can not be achieved due to the wettability problem of the Al2O3 porous perform and the NbAl molten alloy. A proper number of alloyed elements are added, the wettability between the Al2O3 porous ceramic perform and the NbAl molten alloy is improved fully, and therefore non-pressure infiltration between the Al2O3 porous ceramic perform and the NbAl molten alloy is realized. By means of the method for improving the wettability of the Al2O3 porous perform and the NbAl molten alloy, the use range of an industrial chain of NbAl intermetallic compounds is enlarged, the preparation cost of the NbAl / Al2O3 composite materials is reduced, and multi-aspect technical and economic advantages are achieved.

Description

technical field [0001] The invention relates to the technical field of preparation of metal or intermetallic compound-based ceramic composite materials, in particular to a NbAl / Al 2 o 3 Methods for improving wettability during pressureless infiltration of composites. Background technique [0002] Compared with Fe-Al, Ni-Al, and Ti-Al intermetallic compounds, Nb-Al intermetallic compounds have higher melting point and moderate density, and become a high-temperature structural material with potential application value. However, NbAl intermetallic compounds are easily oxidized at high temperature and lead to failure and fracture, which limits their wider application. Therefore, the NbAl / Al designed with layered microstructure 2 o 3 The metal-matrix ceramic composite structure, giving full play to the respective advantages of ceramics and intermetallic compounds, is expected to obtain a new type of metal-matrix ceramic composite material with strong oxidation resistance, goo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/10
Inventor 陈焕铭汪燕青潘凤春马治罗民李星
Owner 陈焕铭
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