Search International and National Patent Collections

1. (WO2018183652) METHOD OF MANUFACTURING A HUMIDITY SENSING MATERIAL

Pub. No.:    WO/2018/183652    International Application No.:    PCT/US2018/025104
Publication Date: Fri Oct 05 01:59:59 CEST 2018 International Filing Date: Fri Mar 30 01:59:59 CEST 2018
IPC: B05D 3/02
B05D 3/04
C04B 35/63
C04B 35/64
C04B 35/468
C04B 35/622
C04B 35/626
G01N 27/22
Applicants: UNITED STATES OF AMERICA as represented by THE ADMINISTRATOR OF THE NATIONAL AERONAUTICS AND SPACE ADMINISTRATION
Inventors: ROLIN, Terry, D.
SMALL, Ian, K.
Title: METHOD OF MANUFACTURING A HUMIDITY SENSING MATERIAL
Abstract:
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.