Method of joining parts made of SiC-based materials by non-reactive brazing with addition of a reinforcement, brazing compositions and joint and assembly that are obtained by such a method
A non-reactive, compositional 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, and achieve good water impermeability, good mechanical adhesion Attached, the effect of simple method
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[0188] 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.
[0189] Reinforcement suspensions and pastes can also be diffused along the same principle.
[0190] 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.
[0191] Preferably, it is recommended in this "sandwich" configuration that for the brazing composition of the invention, the brazi...
example 1
[0276] This example describes the static drop test performed by a brazing composition, wherein the composition of the brazing alloy of the present invention is 64% Si and 36% Ni (atomic percent) (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).
[0277] a) Preparation of brazing composition and brazing paste
[0278]The brazing composition involved: 64 atomic percent silicon and 36 atomic percent nickel prepared from pure silicon wafers and pure nickel wafers.
[0279] 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.
[0280] After cooling, this provides an ingot. The ingot is crushed to obtain a powder.
[0281] organic binder ( Binder) is added to this powder mixture to form a viscous pa...
example 2
[0292] 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), at A single brazing plateau at 1100 °C was observed on the SiC / SiC composite.
[0293] a) Preparation of brazing composition and brazing paste
[0294] The brazing composition involved: 64 atomic % silicon and 36 atomic % nickel prepared as in Example 1.
[0295] A paste of the brazing composition was formed as in Example 1.
[0296] b) Static drop test at 1100°C
[0297] The brazing paste thus prepared 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 get. The plate is pre-cleaned...
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