Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Diffusion bonding method of silicon carbide ceramics and ferritic stainless steel

A technology of silicon carbide ceramics and diffusion connection, which is applied in the diffusion connection of ceramics and stainless steel, adding an intermediate alloy to the field of diffusion connection of silicon carbide ceramics and ferritic stainless steel, which can solve the limitations and disadvantages of precious metal brazing of silicon carbide ceramics and stainless steel Diffusion reaction, high cost and other problems, to achieve the effect of facilitating diffusion reaction, promoting atomic diffusion, and low cost

Inactive Publication Date: 2013-09-04
SHANDONG UNIV
View PDF9 Cites 19 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the impact of welding costs, the application of brazing silicon carbide ceramics and stainless steel with precious metal brazing filler metals is greatly limited
[0004] Existing diffusion bonding methods mostly use precious metals as intermediate alloys, and the temperature is relatively high, which not only has high cost, but also is not conducive to diffusion reactions.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Diffusion bonding of silicon carbide ceramics with a diameter of 30 mm × 10 mm to a cylinder of 00Cr18Mo2 ferritic stainless steel with a diameter of 30 mm × 60 mm.

[0019] The specific process steps are as follows:

[0020] (1) Sand the surface of the 00Cr18Mo2 ferritic stainless steel cylinder with a diameter of 30mm×60mm to be connected with sandpaper to reveal a metallic luster, so that the roughness of the surface to be connected reaches Ra2.0~4.0; then wipe the surface with alcohol and dry it . In addition, use alcohol to wipe the surface of the silicon carbide ceramics with a diameter of 30mm×10mm to be connected, and then blow dry.

[0021] (2) Between the contact surfaces of the silicon carbide ceramics and 00Cr18Mo2 ferritic stainless steel to be connected, place an Al-Si alloy foil with a thickness of 180 μm. The chemical composition of the Al-Si alloy foil (in mass percent) is: Si6.2 %, Cu3.6%, Zn0.15%, Fe0.5%, Ti0.18%, Mn0.10%, and the rest is Al.

[00...

Embodiment 2

[0026] Diffusion connection of 20mm×20mm×4mm silicon carbide ceramics and 20mm×20mm×30mm 1Cr17Mo ferritic stainless steel square cylinder.

[0027] The specific process steps are as follows:

[0028] (1) Sand the surface of 1Cr17Mo ferritic stainless steel to be connected with sandpaper to expose the metallic luster, so that the surface roughness reaches Ra2.5-4.0μm; then wipe the surface with alcohol and dry it. In addition, wipe the surface of the silicon carbide ceramic to be welded with alcohol and dry it.

[0029] (2) Between the contact surfaces of silicon carbide ceramics and 1Cr17Mo ferritic stainless steel to be connected, place an Al-Si alloy foil with a thickness of 150 μm. The chemical composition of the Al-Si alloy foil (in mass percent) is: Si6.2 %, Cu3.6%, Zn0.15%, Fe0.5%, Ti0.18%, Mn0.10%, and the rest is Al.

[0030] (3) Place the silicon carbide ceramic with Al-Si alloy foil and 1Cr17Mo ferritic stainless steel assembly in the vacuum chamber of the vacuum d...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
thicknessaaaaaaaaaa
thicknessaaaaaaaaaa
shear strengthaaaaaaaaaa
Login to View More

Abstract

The invention relates to a diffusion bonding method of silicon carbide ceramics and ferritic stainless steel. Al-Si intermediate alloy is added between the contact faces, to be connected, of the silicon carbide ceramics and stainless steel, and the silicon carbide ceramics and a ferritic stainless steel plate workpiece to be connected are tightly pressed through an upper pressing head and a lower pressing head of diffusion bonding equipment, are arranged in a vacuum chamber and are connected in a diffusion bonding mode. According to technological parameters, heating temperature is 500 DEG C to 540 DEG C, heat preservation time is 25min to 50min, pressure is 40MPa to 90MPa, and a vacuum degree is 1.33 *10-3Pa to 1.33*10-2Pa. Then cooling, cleaning and drying are carried out to achieve diffusion bonding. The Al-Si alloy foil is added, a transition liquid phase is formed on a contact surface in a diffusion bonding process, and the diffusion bonding of the silicon carbide ceramics and the stainless steel is achieved. The melting temperature of the Al-Si alloy foil is greatly lower than the softening temperature of the ferritic stainless steel, and the method is beneficial for accelerating a silicon carbide ceramics / stainless steel interface to form good diffusion bonding.

Description

technical field [0001] The invention relates to a diffusion connection method of ceramics and stainless steel, in particular to a method for diffusion connection of silicon carbide ceramics and ferritic stainless steel by adding an intermediate alloy, which belongs to the field of welding technology. Background technique [0002] Ceramics are hard and brittle high-melting materials with low thermal conductivity, good chemical and thermal stability, high compressive strength and unique properties, such as insulation and electricity, magnetism, sound, light, heat and Biocompatibility, etc., are increasingly valued by people. Due to the inherent brittleness of ceramic materials and the difficulty of preparing high-performance components, the composite structure prepared by connecting ceramics and stainless steel has broad application prospects in the fields of energy, chemical industry, electronics, machinery, and aerospace. [0003] At present, brazing methods are mainly used...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): B23K1/19B23K1/20
Inventor 李亚江王娟张永兰
Owner SHANDONG UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com