Unlock instant, AI-driven research and patent intelligence for your innovation.

Method of joining parts of SiC-based materials by nonreactive brazing, brazing compositions and joint and assembly obtained by this method

A non-reactive, composite technology, applied in the direction of welding/welding/cutting articles, welding/cutting media/materials, welding media, etc., can solve problems such as not allowing mechanical actions, achieve good water impermeability, simple method, The effect of good mechanical adhesion

Inactive Publication Date: 2013-03-20
COMMISSARIAT A LENERGIE ATOMIQUE ET AUX ENERGIES ALTERNATIVES
View PDF4 Cites 9 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This very good wetting is important for the quality of the joint, since it clearly ensures a good filling quality of the joint, but since this latter characteristic is unpredictable, it does not allow to ensure a good filling quality of the joint. mechanical action

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

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method of joining parts of SiC-based materials by nonreactive brazing, brazing compositions and joint and assembly obtained by this method
  • Method of joining parts of SiC-based materials by nonreactive brazing, brazing compositions and joint and assembly obtained by this method
  • Method of joining parts of SiC-based materials by nonreactive brazing, brazing compositions and joint and assembly obtained by this method

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0162] The suspension, the paste, of the brazing composition prepared as previously described is homogenously and uniformly spread, coated using for example a brush or spatula, or optionally a syringe secured to an automated system, or using any other means , applied to allow deposition of a homogeneous layer of brazing paste on the surface of at least one of the components made of silicon carbide-based material to be joined, assembled.

[0163] Then, the paste-coated surfaces of the two components 1 , 2 to be joined, assembled, are arranged in contact. exist figure 1 The brazing configuration shown in is called a "sandwich configuration" because the paste of the brazing composition 3 is placed directly between the surfaces 4, 5 to be joined, assembled.

[0164] Preferably, it is recommended in this "sandwich" configuration that for the brazing composition of the invention, the brazing paste should not be distributed evenly, but in beads of brazing alloy (brazing beads) Appl...

example 1

[0228] This example describes the static drop test performed by a brazing composition, wherein the composition of the brazing alloy of the present invention comprises 64% Si and 36% Ni (atomic percentages) (i.e. in terms of mass percentage 46% Si and 54% Ni), a single brazing plateau at 1100 °C was observed on sintered pure α(α-SiC).

[0229] a) Preparation of brazing composition and brazing paste

[0230] A target brazing composition of 64 atomic % silicon and 36 atomic % nickel was prepared from pure silicon wafers and pure nickel.

[0231] The pieces were weighed taking into account the proportions of the brazing composition and arranged in an alumina crucible. The assembly was placed in a metal furnace and subjected to a thermal cycle with a plateau at 1250°C for 120 minutes under argon.

[0232] After cooling, this provides an ingot. The ingot is crushed to obtain a powder.

[0233] organic binder ( Binder) is added to this powder mixture to form a viscous paste. ...

example 2

[0244]This example describes the static drop test performed by a brazing composition, wherein the brazing alloy of the present invention has a composition of 64% Si and 36% Ni (atomic percentages) (i.e. 46% Si and 54% Ni by mass). % Ni), in SiC / SiC Cerasep A single brazing plateau at 1100 °C was observed on the SiC / SiC composite.

[0245] a) Preparation of brazing composition and brazing paste

[0246] The brazing composition involved: 64 atomic % silicon and 36 atomic % nickel prepared as described in Example 1.

[0247] A paste of the brazing composition was formed as in Example 1.

[0248] b) static drop test at 1100°C

[0249] The prepared brazing paste was used to form small stacks of brazing alloy in the 50 mg range in mass. This stack of brazing alloy is deposited on a plate of silicon carbide / silicon carbide composite with silicon carbide matrix and silicon carbide fibers. The complex is available from Snecma Propulsion Solid under the trade name CERASEP ge...

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
diameteraaaaaaaaaa
sizeaaaaaaaaaa
thicknessaaaaaaaaaa
Login to View More

Abstract

The present application describes a method of joining at least two parts (1, 2) made of silicon-carbide-based materials by non-reactive brazing, in which the parts are brought into contact with a non-reactive brazing composition (3), the assembly formed by the parts (1, 2) and the brazing composition (3) are heated to a brazing temperature sufficient for the brazing composition (3) to be completely or at least partially melted and the parts (1, 2) and the brazing composition (3) are cooled so as to form, after said composition has solidified, a refractory joint, and in which the non-reactive brazing composition (3) is a binary alloy consisting, expressed in atomic percentages, of 60% to 66% of silicon and 34% to 40% of nickel. A brazing composition (3) as defined above, a brazing paste or suspension comprising a powder of said brazing composition and an organic binder are also defined.

Description

technical field [0001] The present invention relates to a method for assembling, joining parts made of silicon carbide based materials by non-reactive brazing with a non-reactive brazing composition, for in particular The purpose of making components entirely based on silicon carbide. [0002] The assembly, joining method according to the invention is generally carried out at a temperature not exceeding 1150°C, preferably between 1020°C and 1150°C. [0003] The invention also relates to brazing compositions and joints and assemblies obtained by this method, an assembly whose maximum service temperature is approximately between 850°C and 880°C. [0004] By "silicon carbide-based" material is generally meant a material whose silicon carbide content is equal to or greater than 50% by weight, preferably equal to or greater than 80% by weight, further preferably 100% by weight, in In this latter case, it can be said that the material consists of or consists of silicon carbide. ...

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): B23K1/00B23K1/19B23K35/30C04B37/00B23K1/20B23K35/02
CPCC04B2237/128B23K1/20B23K1/19C04B2237/38B23K1/0008C04B37/006C04B37/005C04B2235/6567B23K2203/00C04B2235/616B23K35/025C04B2235/96C04B2237/16C04B2237/708C04B2237/365C04B2237/52C04B2237/08C04B2237/82B23K35/02C04B2237/123B23K35/3607B23K35/365B23K2203/16C04B2235/6565C04B2235/6562C04B2235/6581B23K35/30B23K35/368B23K2103/16B23K2103/172B23K2103/52B23K1/00
Inventor 瓦莱里·肖马让-弗朗索瓦·埃纳
Owner COMMISSARIAT A LENERGIE ATOMIQUE ET AUX ENERGIES ALTERNATIVES