The United States of America as represented by the Aministrator of the National Aeronautics and Space Administration
发明人:
Rolin Terry D.,Small Ian K.
申请号：
US201715473322
公开号：
US9987658(B1)
申请日:
2017.03.29
申请国别(地区):
美国
年份:
2018
代理人:
McGroary James J.`Dvorscak Mark P.
摘要：
A method is provided for manufacturing a humidity sensing material. Particles of a trivalent rare earth hydroxide or oxide (such as lanthanum hydroxide) are mixed with particles of barium oxide and titanium dioxide in specified proportions. The particle mixture is heated to generate a sintered mixture that is milled. The resulting milled particles are mixed with glass particles, an organic surfactant, a solvent, an organic vehicle, and an alkali hydroxide. The resulting liquid mixture is deposited as a layer thereof onto a substrate. The substrate and layer thereon are processed to remove liquid portions of the liquid mixture. Such liquid removal processing includes at least one cycle of heating the layer followed by a corresponding cycle of cooling the layer in a nitrogen atmosphere containing less than 25 parts per million of oxygen.
