Abstract:
This invention relates to a high temperature melting composition and method of using the composition for brazing high temperature niobium-based substrates, such as niobium-based refractory metal-intermetallic compositions (RMIC), including but not restricted to niobium-silicide composite alloys. The high temperature melting composition can include one or more alloys. The alloys include a base element selected from titanium, tantalum, niobium, hafnium, silicon, and germanium. The alloys also include at least one secondary element that is different from the base element. The secondary element can be selected from chromium, aluminum, niobium, boron, silicon, germanium and mixtures thereof. When two or more alloys are included in the composition, it is preferable, but not required, to select at least one lower melting alloy and at least one higher melting alloy. The composition is preferably a homogemeous mixture of the two or more alloys combined in powder form.
Abstract:
This invention relates to a high temperature melting composition and method of using the composition for brazing high temperature niobium-based substrates, such as niobium-based refractory metal-intermetallic compositions (RMIC), including but not restricted to niobium-silicide composite alloys. The high temperature melting composition can include one or more alloys. The alloys include a base element selected from titanium, tantalum, niobium, hafnium, silicon, and germanium. The alloys also include at least one secondary element that is different from the base element. The secondary element can be selected from chromium, aluminum, niobium, boron, silicon, germanium and mixtures thereof. When two or more alloys are included in the composition, it is preferable, but not required, to select at least one lower melting alloy and at least one higher melting alloy. The composition is preferably a homogemeous mixture of the two or more alloys combined in powder form.
Abstract:
In one form a maintenance device includes a flexible member with an inspection end sized to be inserted through an inspection port of a workpiece such as a gas turbine engine or a blade of a gas turbine engine. The maintenance device includes a directed energy member that in one form is configured to produce a double pulse laser with an interval time between a first one of the pulses and a second one of the pulses greater than the time of either the first one of the pulses or the second one of the pulses. The first one of the pulses is sufficiently powerful to produce a quantity of debris upon irradiation of the workpiece. The debris produced from the first one of the pulses can be evaporated by the second one of the pulses to eliminate and/or reduce a recast layer on the workpiece.
Abstract:
A braze alloy powder mixture that includes a low-melt powder composition and a high-melt powder composition. The low-melt powder composition is made of one or more low-melt powders and includes 50-70 % Ni, 8-20 % Cr, 8-15 % Ta, 4-10 % Co, 2-7 % Al, and up to 2.25 % B. The high-melt powder composition is made of one or more high-melt powders and includes 50-70 % Ni, 2-10 % Cr, 2-10 % Ta, 5-15 % Co, 2-10 % Al, 2-10 % W, and up to about 3 % each of Re, Mo and Hf. Up to about 1 % Ti, W, Mo, Re, Nb, Hf, Pd, Pt, Ir, Ru, C, Si, and/or Zr may be included in the low-melt powder, while the high-melt powder may include up to about 1 % each of Ti, Nb, C, B, Si, and Zr.
Abstract:
In one form a maintenance device includes a flexible member with an inspection end sized to be inserted through an inspection port of a workpiece such as a gas turbine engine or a blade of a gas turbine engine. The maintenance device includes a directed energy member that in one form is configured to produce a double pulse laser with an interval time between a first one of the pulses and a second one of the pulses greater than the time of either the first one of the pulses or the second one of the pulses. The first one of the pulses is sufficiently powerful to produce a quantity of debris upon irradiation of the workpiece. The debris produced from the first one of the pulses can be evaporated by the second one of the pulses to eliminate and/or reduce a recast layer on the workpiece.
Abstract:
A braze alloy powder mixture that includes a low-melt powder composition and a high-melt powder composition. The low-melt powder composition is made of one or more low-melt powders and includes 50-70 % Ni, 8-20 % Cr, 8-15 % Ta, 4-10 % Co, 2-7 % Al, and up to 2.25 % B. The high-melt powder composition is made of one or more high-melt powders and includes 50-70 % Ni, 2-10 % Cr, 2-10 % Ta, 5-15 % Co, 2-10 % Al, 2-10 % W, and up to about 3 % each of Re, Mo and Hf. Up to about 1 % Ti, W, Mo, Re, Nb, Hf, Pd, Pt, Ir, Ru, C, Si, and/or Zr may be included in the low-melt powder, while the high-melt powder may include up to about 1 % each of Ti, Nb, C, B, Si, and Zr.