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Method for connecting Cf/SiC composite material and Ni-based high-temperature alloy

A technology of composite materials and high-temperature alloys, which is applied in the field of connection and welding, can solve problems such as high-temperature connection difficulties, and achieve the effects of solving air tightness and low connection strength, wide application range, good air tightness and high temperature strength

Inactive Publication Date: 2010-07-28
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the invention is to solve C f / SiC composite materials and Ni-based superalloys are difficult to connect at high temperature, so that the joints have better air tightness and toughness at high temperatures

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Example 1: The Cf / SiC composite material was cut into 6×5×4mm squares, and the GH128 nickel-based superalloy was cut into φ10×5mm cylinders. Grind the welding surface of the composite material with 320-grit sandpaper, clean it with acetone, and dry it in a drying oven with a temperature set to 60 °C; the welding surface of the superalloy is polished with 60-grit sandpaper to remove the surface oxide layer. Clean with ethanol before soldering. The use of Cu-Ti molten metal to f The pretreatment of the welding surface of the / SiC composite material, according to the proportion of Cu-23wt% Ti, put it into a magnesia crucible, and the welding surface of the composite material is also put into the crucible. The filter screen pours out the molten metal, the molten metal flows into the metal mold, and the treated composite material remains on the ceramic mesh. Preparation of welding materials, adding 6.7wt% SiC powder to Ni-20wt%Cr-10wt%Si alloy brazing filler metal powder w...

Embodiment 2

[0016] Example 2: the C f The / SiC composite material is cut into squares of 6×5×4mm, and the GH128 nickel-based superalloy is cut into cylinders of φ10×5mm. Grind the welding surface of the composite material with 320-mesh sandpaper, clean it with acetone, and dry it in a drying oven with a temperature set at 80°C for later use; polish the welding surface of the superalloy with 60-mesh sandpaper to remove the surface oxide layer, Clean with ethanol before soldering. Using Ag-Cu-Ti metal liquid to C f / SiC composite material welding surface pretreatment, according to Ag-37%Cu-10%Ti ingredients into the magnesia crucible, the welding surface of the composite material is also placed in the crucible, vacuum induction heating to 950 ℃ for 30min Finally, the molten metal is poured out through the ceramic filter screen, and the molten metal flows into the metal mold, and the processed composite material remains on the ceramic screen.

[0017] Welding materials are prepared by add...

Embodiment 3

[0019] Example 3: the C f The / SiC composite material is cut into squares of 6×5×4mm, and the GH128 nickel-based superalloy is cut into cylinders of φ10×5mm. Grind the welding surface of the composite material with 320-mesh sandpaper, clean it with acetone, and dry it in a drying oven with a temperature set at 60°C for later use; polish the welding surface of the superalloy with 60-mesh sandpaper to remove the surface oxide layer, Clean with ethanol before soldering. Using Cu-Ti metal liquid to C f / SiC composite material welding surface pretreatment, according to Cu-26wt%Ti ingredients into the magnesia crucible, the welding surface of the composite material is also placed in the crucible, vacuum induction heating to 1000 ℃ for 5min, through the ceramic The filter screen pours out the molten metal, and the molten metal flows into the metal mold, and the processed composite material remains on the ceramic mesh. Welding materials are prepared by adding 2.3wt% SiC powder to t...

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Abstract

The invention relates to a method for connecting a Cf / SiC composite material and an Ni-based high-temperature alloy, belonging to the field of heterologous material connecting. The technical process comprises the following steps of: (1) carrying out reaction pretreatment on the welding surface of a composite material by utilizing alloying metal liquid; and (2) vacuum brazing connecting. The method is characterized in that the pre-reaction is carried out by applying the welding surface of the titanium-contained metal liquid and the composite material to form a welding surface with raised carbon fibers so as to improve the bonding strength of a subsequent brazing connected interface, and a stable reaction layer containing Ti is formed on the welding surface SiC of the composite material so as to prevent the graphitization reaction of SiC and Ni in the composite material in the subsequent brazing connecting process. A powder containing W and SiC is added to a brazing material, which can prevent the Ni element from diffusing to the composite material in the brazing connecting process, reduce the thermal stress of joints and strengthen the joints. The invention can be conveniently applied to practical work; and the joints have good high-temperature strength and gas tightness. The invention is also suitable for connecting carbon fiber reinforced SiC composite materials and other metals.

Description

technical field [0001] The invention belongs to the field of welding and connection, and relates to the connection between dissimilar materials. Background technique [0002] Silicon carbide ceramic material does not melt at 2500 °C, has excellent oxidation resistance in the range of 1000-1650 °C, and is resistant to various acid and alkali corrosion. It not only has high chemical stability, but also has good mechanical properties, especially with Excellent high temperature properties (high temperature strength, creep resistance, etc.). However, silicon carbide ceramic is a brittle material, which affects its use as a structural material. Carbon fiber reinforced silicon carbide ceramic composites (C f / SiC), while maintaining the advantages of SiC ceramics, the toughness of SiC ceramics is greatly improved, and the strength is also improved, which is characterized by low density, high strength, high toughness, high temperature resistance, ablation resistance, erosion resis...

Claims

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Application Information

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IPC IPC(8): C04B37/02
Inventor 林国标王建华
Owner UNIV OF SCI & TECH BEIJING
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