“…Ternary and higher order complexes could also form, for example, in Al 2 O 3 /Kovar (an Fe–Ni alloy) joints made using Cu‐ABA, brittle silicide, Ni 16 Si 7 Ti 6 formed at the interface 25 . In Si 3 N 4 /Ni‐superalloy joints with Ti/Au/Ni interlayers 13 formed by transient liquid phase bonding, a reaction layer of TiN and a small amount of TiO formed. The presence of aluminum in Cu‐ABA (Cu–3Si–2Al–2.25Ti) is conducive to AlN formation, 20,22 according to 1/4 Si 3 N 4 + Al = AlN + 3/4 Si; Δ G 1317K = −97.36 kJ.…”
Section: Resultsmentioning
confidence: 99%
“…Si 3 N 4 has been joined to steel, 7,8 aluminides, 3 tungsten (W), titanium (Ti), and niobium (Nb), 9,10 Ni‐base superalloys, 11–15 and other substrates using either direct bonding or in combinations of metal interlayers 16–18 . For example, multilayered Si 3 N 4 /steel joints have been brazed using AgCuTi brazes in conjunction with 2–4 mm thick Ni/W/Ni interlayers for applications such as turbocharger rotors with a Si 3 N 4 disc brazed to a steel shaft 1 …”
Section: Introductionmentioning
confidence: 99%
“…Additionally, active brazes, such as Pd-Ni-Ti, Au-Pd-Ti, Ni-Pd-Cr, Ni-Si-Cr, and Cu-Pt-Ti/Nb, and nonreactive brazes Pd-Ni and Au-Pd-Ni in conjunction with premetallized Si 3 N 4 also have been used. Si 3 N 4 has been joined to steel, 7,8 aluminides, 3 tungsten (W), titanium (Ti), and niobium (Nb), 9,10 Ni-base superalloys, [11][12][13][14][15] and other substrates using either direct bonding or in combinations of metal interlayers. [16][17][18] For example, multilayered Si 3 N 4 /steel joints have been brazed using AgCuTi brazes in conjunction with 2-4 mm thick Ni/W/Ni interlayers for applications such as turbocharger rotors with a Si 3 N 4 disc brazed to a steel shaft.…”
Si3N4/nickel‐base superalloy (Inconel‐625) and Si3N4/Si3N4 joints with refractory metal (W and Mo) interlayers were vacuum brazed using a Ti‐active braze Cu‐ABA (92.75Cu–3Si–2Al–2.25Ti) at 1317 K for 30 min with the following interlayered arrangements: Si3N4/Mo/W/Inconel and Si3N4/Mo/W/Si3N4. The joints exhibited Ti segregation at the Si3N4/Cu‐ABA interface, elemental interdiffusion across the joint interfaces, and sound metallurgical bonding. Knoop microhardness profiles revealed hardness gradients across the joints that mimicked the interlayered arrangement. The compressive shear strength of Si3N4/Si3N4 joints both with and without W and Mo layers was ∼142 MPa but the strength of Si3N4/Inconel joints increased from ∼9 MPa for directly bonded joints without interlayers to 53.5 MPa for joints with Mo and W interlayers.
“…Ternary and higher order complexes could also form, for example, in Al 2 O 3 /Kovar (an Fe–Ni alloy) joints made using Cu‐ABA, brittle silicide, Ni 16 Si 7 Ti 6 formed at the interface 25 . In Si 3 N 4 /Ni‐superalloy joints with Ti/Au/Ni interlayers 13 formed by transient liquid phase bonding, a reaction layer of TiN and a small amount of TiO formed. The presence of aluminum in Cu‐ABA (Cu–3Si–2Al–2.25Ti) is conducive to AlN formation, 20,22 according to 1/4 Si 3 N 4 + Al = AlN + 3/4 Si; Δ G 1317K = −97.36 kJ.…”
Section: Resultsmentioning
confidence: 99%
“…Si 3 N 4 has been joined to steel, 7,8 aluminides, 3 tungsten (W), titanium (Ti), and niobium (Nb), 9,10 Ni‐base superalloys, 11–15 and other substrates using either direct bonding or in combinations of metal interlayers 16–18 . For example, multilayered Si 3 N 4 /steel joints have been brazed using AgCuTi brazes in conjunction with 2–4 mm thick Ni/W/Ni interlayers for applications such as turbocharger rotors with a Si 3 N 4 disc brazed to a steel shaft 1 …”
Section: Introductionmentioning
confidence: 99%
“…Additionally, active brazes, such as Pd-Ni-Ti, Au-Pd-Ti, Ni-Pd-Cr, Ni-Si-Cr, and Cu-Pt-Ti/Nb, and nonreactive brazes Pd-Ni and Au-Pd-Ni in conjunction with premetallized Si 3 N 4 also have been used. Si 3 N 4 has been joined to steel, 7,8 aluminides, 3 tungsten (W), titanium (Ti), and niobium (Nb), 9,10 Ni-base superalloys, [11][12][13][14][15] and other substrates using either direct bonding or in combinations of metal interlayers. [16][17][18] For example, multilayered Si 3 N 4 /steel joints have been brazed using AgCuTi brazes in conjunction with 2-4 mm thick Ni/W/Ni interlayers for applications such as turbocharger rotors with a Si 3 N 4 disc brazed to a steel shaft.…”
Si3N4/nickel‐base superalloy (Inconel‐625) and Si3N4/Si3N4 joints with refractory metal (W and Mo) interlayers were vacuum brazed using a Ti‐active braze Cu‐ABA (92.75Cu–3Si–2Al–2.25Ti) at 1317 K for 30 min with the following interlayered arrangements: Si3N4/Mo/W/Inconel and Si3N4/Mo/W/Si3N4. The joints exhibited Ti segregation at the Si3N4/Cu‐ABA interface, elemental interdiffusion across the joint interfaces, and sound metallurgical bonding. Knoop microhardness profiles revealed hardness gradients across the joints that mimicked the interlayered arrangement. The compressive shear strength of Si3N4/Si3N4 joints both with and without W and Mo layers was ∼142 MPa but the strength of Si3N4/Inconel joints increased from ∼9 MPa for directly bonded joints without interlayers to 53.5 MPa for joints with Mo and W interlayers.
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