Zirconia has the properties of chemical inertness, so it is good material to work on chemical condition: hard to be corroded by chemical products, and by no means to pollute chemical products. We have the collaboration experience with coal power plants, petrochemical industry and catalyzer makers. The thermoelectric couple we developed can monitor the air temperature in the furnace in the coal power plants, resisting the very-high temperature, corrosion and strike of the high-speed pulverized coal.