Methods of cooling glasses post-ion exchange

A method of manufacturing a glass-based article comprising:

• conducting an ion exchange treatment and a cooling in a vessel that defines:
• a reservoir containing a molten salt bath, a head space within the vessel above the molten salt bath, and a vent in fluid communication with the head space, wherein a movable partition resides within the vessel such that a first position of the movable partition puts the reservoir in fluid communication with the head space and a second position of the movable partition separates the reservoir from the head space;
• the ion exchange treatment comprising:
• exposing an alkali-aluminosilicate glass-based substrate comprising opposing first and second surfaces defining a substrate thickness (t) to a molten salt bath disposed in the reservoir to form an ion exchanged glass-based substrate, the substrate thickness (t) being greater than or equal to 25 micrometers and less than or equal to 125 micrometers;
• and
• thereafter the cooling of the ion exchanged glass-based substrate in the head space comprising:
• moving the movable partition to the second position;
• setting a starting temperature of the head space to less than or equal to 200° C.;
• and
• reducing the starting temperature at a rate of greater than or equal to 3.3° C./minute and less than or equal to 25° C./minute;
• wherein upon cooling for a cooling duration, the glass-based article is formed.