Transient liquid phase (TLP) bonding of nickel based alloys by forming an aluminum-titanium coating and subsequent heat treatment

A method for bonding nickel (Ni) based alloys, comprising:

• (a) performing pack cementation on the Ni based alloys under argon at a predetermined first temperature of about 900-1100° C. for about 1 hour of time using a pack composition to form a coating on the Ni based alloys, wherein the pack composition comprises:
• (i) aluminum oxide (Al2O3) powder comprising a first weight percent (wt. %) of the pack composite;
• (ii) titanium (Ti) powder comprising a second wt. % of the pack composite;
• (iii) Ni—Al alloy powder comprising a third wt. % of the pack composite, wherein the Ni comprises about 50% weight percentage of the Ni—Al alloy powders;
• and
• (iv) ammonium chloride (NH4Cl) powder comprising a fourth wt. % of the pack composite;
• (b) sonicating the Ni based alloys with the coating in acetone for about 2 hours;
• and
• (c) annealing the sonicated Ni based alloys with the coating under vacuum at a predetermined second temperature of about 1120-1300° C. for about 2 days to form a transient liquid phase (TLP) bonding structure having a TLP bonded layer formed on the Ni based alloys, wherein the TLP bonding structure has a uniform γ′ phase distribution with identical compositions and properties at bonding regions between the TLP bonded layer and the Ni based alloys.

A transient liquid phase (TLP) bonding structure, comprising:

• (a) nickel (Ni) based alloys;
• and
• (b) a TLP bonded layer formed on the Ni based alloys by pack cementation using a pack composition, wherein the pack composition comprises:
• (i) aluminum oxide (Al2O3) powder comprising a first weight percent (wt. %) of the pack composite;
• (ii) titanium (Ti) powder comprising a second wt. % of the pack composite;
• (iii) Ni—Al alloy powder comprising a third wt. % of the pack composite, wherein the Ni comprises about 50% weight percentage of the Ni—Al alloy powders;
• and
• (iv) ammonium chloride (NH4Cl) powder comprising a fourth wt. % of the pack composite.

A method for bonding nickel (Ni) based alloys, comprising:

• (a) performing pack cementation on the Ni based alloys under a noble gas environment at a first temperature for a first period of time using a pack composition to form a coating on the Ni based alloys, wherein the pack composition comprises:
• (i) aluminum oxide (Al2O3) powder comprising a first weight percent (wt. %) of the pack composite;
• (ii) titanium (Ti) powder comprising a second wt. % of the pack composite;
• (iii) Ni—Al alloy powder comprising a third wt. % of the pack composite, wherein the Ni comprises about 50% weight percentage of the Ni—Al alloy powders;
• and
• (iv) ammonium chloride (NH4Cl) powder comprising a fourth wt. % of the pack composite;
• (b) sonicating the Ni based alloys with the coating in acetone for a second period of time;
• and
• (c) annealing the sonicated Ni based alloys with the interlayer under vacuum at a second temperature for a third period of time to form a transient liquid phase (TLP) bonding structure having a TLP bonded layer formed on the Ni based alloys.