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Microwave auxiliary connection method for alumina ceramic

A technology of alumina ceramics and a connection method, which is applied in the field of microwave-assisted connection of alumina ceramics, can solve the problems of strict equipment requirements, lowering the performance of the matrix, affecting the service life of components, etc., and achieves simple process, improved reliability, and improved wettability. Effect

Inactive Publication Date: 2008-09-24
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When connecting large special-shaped components, the following problems often occur: 1) The equipment requirements are strict; 2) When the selected solder or the middle layer is quite different from the substrate, large-sized and complex-structured joints are prone to large internal stresses. In severe cases, when the joint is cooled to room temperature, it will crack or cracks will occur in the ceramic near the joint interface, which will affect the service life of the component; 3) When the joint temperature exceeds the allowable temperature of the strengthening phase or toughening phase in the composite ceramic, it will be seriously reduced. Its strengthening or toughening effect; 4) In some occasions, only structural ceramic components are required to have good wear resistance or corrosion resistance, and the bonding strength of the components, especially the high temperature strength, is not very high; 5) When the connection temperature is close to the sintering temperature , will cause component deformation, grain growth and coarsening, and reduce the performance of the matrix itself

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The connected member is a cuboid with a size of 30×5×3mm, and the material is 95 alumina ceramics. The configured mesophase is Al-Si alloy powder 22.16wt%, Al 2 o 3 30.83wt%, ZrO 2 25wt%, SiO 2 20.80wt%, Y 2 o 3 1.25 wt%. After mixing by ball milling, drying and grinding into powder, passing through a 200-mesh sieve, adding ethanol to make a paste with a solid phase content of 30%-50%. Apply evenly on the surface of 95-alumina ceramics, connect the two surfaces to be connected and dry in the air. Place the dried components in a mullite crucible, bury and burn them with alumina powder, and pressurize the surface to be connected (large-sized components can be pressurized by their own pressure), and then carry out microwave treatment, 1000W power treatment After 30 min, it was naturally cooled to room temperature.

[0022] The scanning electron microscope observation of the connection interface shows that the connection interface is well bonded, and the Al-Si a...

Embodiment 2

[0024] The size of the connected member is 30mm in outer diameter, 18mm in inner diameter, 10mm in thickness, and the material is 95 alumina ceramic ring. The middle phase is Al-Si alloy powder 20.55wt%, Al 2 o 3 28.63wt%, ZrO 2 30wt%, SiO 2 19.32wt%, Y 2 o 3 1.5 wt%. After ball milling and mixing, dry and grind into powder, pass through a 200-mesh sieve, disperse with absolute ethanol, and adjust the solid phase content to 45 wt%. Evenly coat the surface to be connected with the alumina ceramic ring, connect the two connected surfaces and dry in the air. The gravity of the ceramic ring provides pressure, and the connecting piece is subjected to microwave treatment. The microwave treatment process is as follows: 1000W microwave power is irradiated for 10 minutes, converted to 2000W power for 10 minutes, and finally 3000W is irradiated for 10 minutes; natural cooling to room temperature.

[0025] The scanning electron microscope observation of the connection interfac...

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Abstract

The present invention discloses a microwave-assisted connecting method of alumina ceramics. The method has the following steps: (1), 20.55 to 22.15 weight percent of Al-Si alloy powder, 28.63 to 30.80 weight percent of Al2O3, 25 to 30 weight percent of ZrO2, 19.32 to 20.80 weight percent of SiO2, and 1.25 to 1.5 weight percent of Y2O3 are used for preparing an intermediate phase; (2), the intermediate phase is made into paste-shaped powder; (3), the paste-shaped intermediate phase is coated on the surface to be connected; (4), the intermediate phase and the surface to be connected are processed through burying sintering; (5), the intermediate phase and the surface to be connected are processed through a microwave; and (6) the intermediate phase and the surface to be connected are oxidated when the microwave is open. The present invention provides a microwave-assisted connecting method that has the advantages of low melting point, fully wetting of the surface of the ceramics, partial heating by a microwave, orderly connection and reaction under the oxidation condition, and low-temperature rapid connection of alumina ceramics of high temperature resistance, wear resistance and corrosion resistance. The method can be used in the environment, in which the materials that are transmitted at high speed exert the influence of damaging scour and abrasion on the pipeline, and can be used for the connection of large and abnormal alumina-based ceramic components with high temperature resistance and corrosion resistance in the aerospace engines, the nuclear industry and so on.

Description

technical field [0001] The invention relates to a connection method of alumina ceramics, in particular to a microwave-assisted connection method of alumina ceramics. Background technique [0002] Ceramic connection is an important technology to realize ceramic multi-functional assembly and low-cost preparation of large special-shaped components. The existing research results are to improve the high-temperature performance of structural ceramic joints, and high-temperature resistant materials are mainly used for high-temperature connections, such as high-melting point brazing filler metals and Diffusion bonding or sintering bonding with a heat-resistant interlayer. When connecting large special-shaped components, the following problems often occur: 1) The equipment requirements are strict; 2) When the selected solder or the middle layer is quite different from the substrate, large-sized and complex-structured joints are prone to large internal stresses. In severe cases, when...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B37/00
Inventor 刘家臣李顺何欣范巍李中秋
Owner TIANJIN UNIV