Patent ID: 8025367

Claim:
An inkjet printhead for ejecting drops of liquid on to a media substrate, the inkjet printhead comprising: a chamber for holding liquid; a nozzle in fluid communication with the chamber; a heater positioned in the chamber for thermal contact with the liquid such that resistive heating of the heater generates a vapour bubble that ejects a drop of the liquid through the nozzle; wherein, the heater is formed from a TiAlX alloy where Ti contributes more than 40% by weight, Al contributes more than 40% by weight and X contributes less than 5% by weight and comprises zero or more of Ag, Cr, Mo, Nb, Si, Ta and W, wherein the heater has a microstructure with a grain size less than 100 nanometers, and the heater further comprises a protective coating, the protective coating having a total thickness less than 0.5 microns.