Method for manufacturing a titanium sheet and a shaped component consisting of the titanium sheet
The invention relates to a roll-bonded titanium sheet ( 6 ), a shaped component manufactured therefrom ( 10 ) and a method for manufacturing the titanium sheet ( 6 ) and the shaped component ( 10 ). In order to achieve a high-temperature-resistant shaped component ( 10 ), a titanium sheet ( 2 ) is roll-bonded at least on one side with aluminium foil ( 4 ) whose thickness (d) is small compared with the thickness (D) of the titanium sheet ( 2 ). As a result of heat treatment of the roll-bonded titanium sheet ( 6 ), the aluminium and titanium from the adjoining region are converted to an aluminium-titanium alloy. The outer titanium-aluminium-alloy layer of the titanium sheet ( 6 ) thus formed is converted by contact with oxygen into a titanium-aluminium-mixed oxide layer which gives the titanium sheet ( 6 ) good corrosion protection. The forming of the shaped component ( 10 ) preferably takes place before the heat treatment for alloy formation because the roll-bonded titanium sheet ( 6 ) is then still slightly deformable.
1. A method for manufacturing a roll-bonded titanium sheet comprising the following procedural steps:
a. roll-bonding at least on one side of the titanium sheet with an aluminum foil whose thickness is small compared with the thickness of the titanium sheet;
b. converting aluminum and titanium from adjoining regions to a titanium-aluminum alloy by heat-treatment of the roll-bonded titanium sheet until the aluminum foil is completely converted into the titanium alloy;
c. converting an outer titanium-aluminum alloy layer of the titanium sheet into a titanium-aluminum-mixed oxide layer by contact with oxygen;
wherein the thickness of the aluminum layer after the roll-bonding is between 0.02 and 0.06 mm.
2. The method according to claim 1 , wherein the thickness ratio (d/D) of the aluminum foil used and the titanium sheet used is in the range of a power of ten.
3. The method according to claim 1 , wherein the thickness (D) of the titanium sheet used is between 1 and 2.5 mm and the thickness (d) of the aluminum foil used is between 0.1 and 0.2 mm.
4. The method according to claim 1 for manufacturing a shaped component wherein the forming of the roll-bonded titanium sheet into the shaped component takes place before the heat treatment for alloy formation.
5. The method according to claim 4 , wherein the heat treatment for alloy formation takes place during use of the shaped component.