High hardness titanium alloy foil preparation method, including the following steps: Titanium alloy semi-finished coil was obtained by electroplating nickel and chromium on the surface of titanium coil. The titanium alloy semi-finished coil is subjected to the first vacuum heat treatment to obtain the dehydrogenated titanium alloy semi-finished coil;
The titanium alloy semi-finished coil is pretreated and the second vacuum heat treatment in turn to obtain the titanium alloy semi-finished foil; The pre-treated atmosphere is atmosphere;
The titanium alloy semi-finished product foil is heat treated to obtain high hardness titanium alloy foil.
The invention electroplates nickel and chromium successively on the surface of titanium coil to obtain titanium alloy semi-finished coil. In the invention, the thickness of the titanium coil is preferably 0.04 ~ 0.1mm, and preferably 0.045 ~ 0.05mm; The titanium coil is preferably TA1 or TA2. In the present invention, the titanium coil is preferably de-oiled before nickel plating.
The invention has no special requirements for the specific processes of nickel plating and chromium plating, and the plating process well known to the technical personnel in the field can be adopted. In the invention, the thickness of the nickel layer obtained by the nickel plating is preferably subject to the mass percentage of Ni being controlled as 60%; The thickness of the chromium layer obtained by electroplating chromium is preferably controlled by the mass percentage of Cr of 5 ~ 10%. The invention optimally washes the resulting coil after nickel plating and then electroplates chromium; The washing is preferably deionized washing.
In the invention, the content of nickel element in the titanium alloy semi-finished coil is preferably 60wt %; The content of chromium element in the titanium alloy semi-finished coil is preferably 5 ~ 10wt %, preferably 9wt %.
After the titanium alloy semi-finished coil is obtained, the titanium alloy semi-finished coil is subjected to the first vacuum heat treatment to obtain the hydrogen-removing titanium alloy semi-finished coil. In the invention, the temperature of the first vacuum heat treatment is preferably 600 ~ 700℃, and preferably 650 ~ 680℃; The holding time is preferably 2 ~ 6h, preferably 3 ~ 5h. After the first vacuum heat treatment, the obtained coil is cooled to room temperature with the furnace to obtain the semi-finished coil of dehydrogenated titanium alloy.
