Method for measuring surface temperatures of turbine blade

A method for measuring surface temperatures of a turbine blade, comprising the following steps:

• step 1:
• cleaning the turbine blade and blowing dry;
• step 2:
• firstly, preparing a NiCrAlY buffer layer on a surface of the turbine blade by an ion beam sputtering method, and then preparing an YSZ insulating layer on a surface of the NiCrAlY buffer layer by the ion beam sputtering method;
• step 3, preparing alumina sol by a sol-gel method;
• step 4, preparing an alumina insulating layer on a surface of the YSZ insulating layer by a dipping-coating method;
• step 5, preparing a strip-shaped platinum electrode layer on a surface of the alumina insulating layer by a screen printing method;
• step 6, firstly, drilling a filling hole on a surface of a starting end of the strip-shaped platinum electrode layer, making the turbine blade exposed through the filling hole, then filling platinum slurry into the filling hole, and then sintering and curing at a high temperature to prepare a platinum-filled lead wire;
• step 7:
• firstly, connecting a platinum wire to a surface of a tail end of the strip-shaped platinum electrode layer, and then connecting a nickel-chromium alloy wire to the turbine blade;
• step 8, preparing alumina protective layers on the surface of the alumina insulating layer and a surface of the strip-shaped platinum electrode layer by adopting the dipping-coating method, wherein at this time, the turbine blade, the strip-shaped platinum electrode layer, the platinum-filled lead wire, the platinum wire and the nickel-chromium alloy wire jointly constitute a thermocouple;
• the turbine blade is used as a positive pole of the thermocouple, the strip-shaped platinum electrode layer and the platinum-filled lead wire together serve as a negative pole of the thermocouple, the platinum wire and the nickel-chromium alloy wire are used as two compensation wires of the thermocouple respectively;
• a connection between the platinum-filled lead wire and the turbine blade is used as a hot junction for the thermocouple;
• and a tail end of the platinum wire and a tail end of the nickel-chromium alloy wire are used as two cold junctions of the thermocouple respectively;
• and
• step 9, connecting the two cold junctions of the thermocouple with a data collector, measuring the surface temperatures of the turbine blade in real time by using the thermocouple, and sending measurement results in real time to the data collector for display, thereby realizing a surface temperature measurement of the turbine blade.